prof. dr hab. inż. Henryk Petryk

Zakład Mechaniki Materiałów (ZMM)
Pracownia Mechaniki Materiałów Niesprężystych (PMMN)
stanowisko: profesor zwyczajny
telefon bezpośredni: (+48) 22 826 98 34
telefon: (+48) 22 826 12 81 wew.: 138
pokój: 137
e-mail: hpetryk

Rozprawa doktorska
1978Ustalone płaskie przepływy ośrodków idealnie plastycznych ze swobodnym brzegiem 
promotor -- prof. dr hab. inż. Wojciech Szczepiński, IPPT PAN
301 
Rozprawa habilitacyjna
1988Niejednoznaczność i niestateczność procesów deformacji plastycznych 
Profesura
1995Nadanie tytułu naukowego profesora
Inne
2010Członek korespondent Polskiej Akademii Nauk
2016Sekretarz Generalny IUTAM

Promotor prac doktorskich
1.2010-11-25Kursa Michał  Modelowanie deformacji plastycznych w kryształach metali metodą przyrostowej minimalizacji energii637
 
2.1992Kiryk Romuald  Mikromechaniczny model lepkoplastycznych materiałów polikrystalicznych 

Kierownik projektów
1.

Zlec. 125_1 Termomechanika materiałów wielofunkcyjnych.

  1. Badania doświadczalne, statyczne i dynamiczne oraz modelowanie materiałów wielofunkcyjnych: TiNi, TiAl, miedź typu OFHC.
  2. Identyfikacja i weryfikacja wieloskalowych modeli plastyczności i lepkoplastyczności: kompozyty, pianki ceramiczne i metaliczne.
Zlec. 125_2 Termografia podczerwieni w badaniach  materiałów i w defektoskopii.
  1. Badania efektów cieplnych podczas deformacji plastycznej w skali mikroskopowej.
  2. Określenie wpływu kształtu i orientacji defektów na powierzchniowy rozkład temperatury po nagrzaniu impulsem cieplnym.

Zlec. 125_3

  1. Badanie zmian własności mechanicznych oraz mikrogeometrii powierzchni warstwy wierzchniej w procesach kształtowania i eksploatacji.
  2. Zastosowanie metod nano- i mikro- indentacji do badania cienkich warstw. Badanie eksperymentalne i modelowanie procesu kontaktu i zużycia.
  3. Badanie wpływu parametrów kształtowania na własności warstw implantowanych.

Zlec. 125_4 Mikromechanika materiałów  i cienkich warstw w zakresie niesprężystym.

  1. Modelowanie mikromechaniczne metalicznych materiałów polikrystalicznych w zakresie niesprężystym.
  2. Modelowanie i wieloskalowa analiza warstw kontaktowych: opis dużych deformacji i zużycia powierzchni.
  3. Zastosowanie metody przyrostowej minimalizacji energii w modelowaniu ewolucji mikrostruktur w kryształach i polikryształach metali
  4. Modelowanie mikromechaniczne kompozytów o osnowie metalowej.

Zlec. 125_5 Modelowanie, wytwarzanie i charakterystyka kompozytów ceramiczno-metalowych.

  1. Modelowanie kompozytów ceramiczno-metalowych.
  2. Opracowanie podstaw technologii i wytwarzanie kompozytów ceramiczno-metalowych.
  3. Badania mikrostrukturalne i mikromechaniczne wytworzonych kompozytów.
, Badania statutowe, Okres realizacji od 2014 do 2014, Finansowanie: MNiSzW,
2. Efekty energii granic strukturalnych w wieloskalowym modelu mikromechanicznym dla stopów z pamięcią kształtu, Badania własne, Okres realizacji od 2008 do 2011, N501 2677 34

Ostatnie publikacje
1.Petryk H., Stupkiewicz S., Kucharski S., On direct estimation of hardening exponent in crystal plasticity from the spherical indentation test, INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, ISSN: 0020-7683, DOI: 10.1016/j.ijsolstr.2016.09.025, pp.1-13, 2017
Petryk H., Stupkiewicz S., Kucharski S., On direct estimation of hardening exponent in crystal plasticity from the spherical indentation test, INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, ISSN: 0020-7683, DOI: 10.1016/j.ijsolstr.2016.09.025, pp.1-13, 2017

Abstract:
A novel methodology is proposed for estimating the strain hardening exponent of a metal single crystal directly from the spherical indentation test, without the need of solving the relevant inverse problem. The attention is focused on anisotropic piling-up and sinking-in that occur simultaneously in different directions, in contrast to the standard case of axial symmetry for isotropic materials. To correlate surface topography parameters with the value of material hardening exponent, a finite-element study of spherical indentation has been performed within a selected penetration depth range using a finite-strain crystal plasticity model. It is shown how the power-law hardening exponent can be estimated from the measured pile-up/sink-in pattern around the residual impression after indentation in a (001)-oriented fcc single crystal of a small initial yield stress. For this purpose, a new parameter of surface topography is defined as the normalized material volume displaced around the nominal contact zone, calculated by integration of the local residual height (positive or negative) over a centered circular ring. That indicator can be easily determined from an experimental topography map available in a digital form. Comparison is made with the estimates based on measurements of the contact area and the slope of the load–penetration depth curve in logarithmic coordinates. The proposed methodology is extended to estimation of the hardening exponent simultaneously with the initial yield stress when the latter is not negligible. Experimental verification for a Cu single crystal leads to promising conclusions.

Keywords:
Metal crystal, Elastoplasticity, Finite deformation, Strain hardening, Experimental identification

35p.
2.Tůma K., Stupkiewicz S., Petryk H., Size effects in martensitic microstructures: Finite-strain phase field model versus sharp-interface approach, JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, ISSN: 0022-5096, DOI: 10.1016/j.jmps.2016.04.013, Vol.95, pp.284-307, 2016
Tůma K., Stupkiewicz S., Petryk H., Size effects in martensitic microstructures: Finite-strain phase field model versus sharp-interface approach, JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, ISSN: 0022-5096, DOI: 10.1016/j.jmps.2016.04.013, Vol.95, pp.284-307, 2016

Abstract:
A finite-strain phase field model for martensitic phase transformation and twinning in shape memory alloys is developed and confronted with the corresponding sharp-interface approach extended to interfacial energy effects. The model is set in the energy framework so that the kinetic equations and conditions of mechanical equilibrium are fully defined by specifying the free energy and dissipation potentials. The free energy density involves the bulk and interfacial energy contributions, the latter describing the energy of diffuse interfaces in a manner typical for phase-field approaches. To ensure volume preservation during martensite reorientation at finite deformation within a diffuse interface, it is proposed to apply linear mixing of the logarithmic transformation strains. The physically different nature of phase interfaces and twin boundaries in the martensitic phase is reflected by introducing two order-parameters in a hierarchical manner, one as the reference volume fraction of austenite, and thus of the whole martensite, and the second as the volume fraction of one variant of martensite in the martensitic phase only. The microstructure evolution problem is given a variational formulation in terms of incremental fields of displacement and order parameters, with unilateral constraints on volume fractions explicitly enforced by applying the augmented Lagrangian method. As an application, size-dependent microstructures with diffuse interfaces are calculated for the cubic-to-orthorhombic transformation in a CuAlNi shape memory alloy and compared with the sharp-interface microstructures with interfacial energy effects.

Keywords:
Phase-field method, Microstructure, Martensite, Size effects, Shape memory alloys

40p.
3.Petryk H., Stupkiewicz S., A minimal gradient-enhancement of the classical continuum theory of crystal plasticity. Part I: The hardening law, ARCHIVES OF MECHANICS, ISSN: 0373-2029, Vol.68, No.6, pp.459-485, 2016
Petryk H., Stupkiewicz S., A minimal gradient-enhancement of the classical continuum theory of crystal plasticity. Part I: The hardening law, ARCHIVES OF MECHANICS, ISSN: 0373-2029, Vol.68, No.6, pp.459-485, 2016

Abstract:
A simple gradient-enhancement of the classical continuum theory of plasticity of single crystals deformed by multislip is proposed for incorporating size effects in a manner consistent with phenomenological laws established in materials science. Despite considerable efforts in developing gradient theories, there is no consensus regarding the minimal set of physically based assumptions needed to capture the slip-gradient effects in metal single crystals and to provide a benchmark for more refined approaches. In order to make a step towards such a reference model, the concept of the tensorial density of geometrically necessary dislocations generated by slip-rate gradients is combined with a generalized form of the classical Taylor formula for the flow stress. In the governing equations in the rate form, the derived internal length scale is expressed through the current flow stress and standard parameters so that no further assumption is needed to define a characteristic length. It is shown that this internal length scale is directly related to the mean free path of dislocations and possesses physical interpretation which is frequently missing in other gradient-plasticity models.

Keywords:
gradient plasticity, geometrically necessary dislocations, single crystal, strain-hardening, internal length scale, size effect

20p.
4.Stupkiewicz S., Petryk H., A minimal gradient-enhancement of the classical continuum theory of crystal plasticity. Part II: Size effects, ARCHIVES OF MECHANICS, ISSN: 0373-2029, Vol.68, No.6, pp.487-513, 2016
Stupkiewicz S., Petryk H., A minimal gradient-enhancement of the classical continuum theory of crystal plasticity. Part II: Size effects, ARCHIVES OF MECHANICS, ISSN: 0373-2029, Vol.68, No.6, pp.487-513, 2016

Abstract:
In our previous paper, a simple gradient-enhancement of the classical continuum theory of plasticity of single crystals deformed by multislip has been proposed for incorporating size effects. A single internal length scale has been derived as an explicit function of the flow stress defined as the isotropic part of critical resolved shear stresses. The present work is focused on verification whether the simplifications involved are not too severe and allow satisfactory predictions of size effects. The model has been implemented in a finite element code and applied to three-dimensional simulations of fcc single crystals. We have found that the experimentally observed indentation size effect in a Cu single crystal is captured correctly in spite of the absence of any adjustable length-scale parameter. The finite element treatment relies on introducing non-local slip rates that average and smoothen on an element scale the corresponding local quantities. Convergence of the finite element solution to the analytical one is also verified for the one-dimensional problem of a boundary layer formed at a constrained interface.

Keywords:
gradient plasticity, geometrically necessary dislocations, boundary layer, size effects, indentation, finite element method

20p.
5.Petryk H., Kursa M., Incremental work minimization algorithm for rate-independent plasticity of single crystals, INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, ISSN: 0029-5981, DOI: 10.1002/nme.4925, Vol.104, No.3, pp.157-184, 2015
Petryk H., Kursa M., Incremental work minimization algorithm for rate-independent plasticity of single crystals, INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, ISSN: 0029-5981, DOI: 10.1002/nme.4925, Vol.104, No.3, pp.157-184, 2015

Abstract:
A new constitutive algorithm for the rate-independent crystal plasticity is presented. It is based on asymptotically exact formulation of the set of constitutive equations and inequalities as a minimum problem for the incremental work expressed by a quadratic function of non-negative crystallographic slips. This approach requires selective symmetrization of the slip-system interaction matrix restricted to active slip-systems, while the latent hardening rule for inactive slip-systems is arbitrary. The active slip-system set and incremental slips are determined by finding a constrained minimum point of the incremental work. The solutions not associated with a local minimum of the incremental work are automatically eliminated in accord with the energy criterion of path stability. The augmented Lagrangian method is applied to convert the constrained minimization problem to a smooth unconstrained one. Effectiveness of the algorithm is demonstrated by the large deformation examples of simple shear of a face-centered cubic (fcc) crystal and rolling texture in a polycrystal. The algorithm is extended to partial kinematic constraints and applied to a uniaxial tension test in a high-symmetry direction, showing the ability of the algorithm to cope with the non-uniqueness problem and to generate experimentally observable solutions with a reduced number of active slip-systems.

Keywords:
solids, crystal plasticity, rate-independent constitutive equations, material stability, variational methods, incremental energy minimization, augmented Lagrangian method

40p.
6.Kowalczyk-Gajewska K., Sztwiertnia K., Kawałko J., Wierzbanowski K., Wroński M., Frydrych K., Stupkiewicz S., Petryk H., Texture evolution in titanium on complex deformation paths: Experiment and modelling, MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2015.04.040, Vol.637, pp.251-263, 2015
Kowalczyk-Gajewska K., Sztwiertnia K., Kawałko J., Wierzbanowski K., Wroński M., Frydrych K., Stupkiewicz S., Petryk H., Texture evolution in titanium on complex deformation paths: Experiment and modelling, MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2015.04.040, Vol.637, pp.251-263, 2015

Abstract:
Texture evolution in commercially pure titanium deformed by equal-channel angular pressing (ECAP) and extrusion with forward–backward rotating die (KoBo) is studied both experimentally and numerically. New results are provided that demonstrate the effects of distinct and complex deformation paths on the texture in the ultra-fine grained (UFG) material obtained after severe plastic deformation (SPD). The numerical simulations are based on the self-consistent viscoplastic method of grain-to-polycrystal scale transition. A recently proposed modification of the probabilistic scheme for twinning is used that provides consistent values of the twin volume fraction in grains. The basic components of the experimentally observed texture are reasonably well reproduced in the modelling. The numerical simulations provide an insight into the internal mechanisms of plastic deformation, revealing substantial activity of mechanical twinning in addition to the basal and prismatic slip in titanium processed by ECAP.

Keywords:
Texture evolution, UFG materials, SPD processes, Crystal plasticity, Twinning

35p.
7.Fischer F.D., Svoboda J., Petryk H., Thermodynamic extremal principles for irreversible processes in materials science, ACTA MATERIALIA, ISSN: 1359-6454, DOI: 10.1016/j.actamat.2013.11.050, Vol.67, No.153, pp.1-20, 2014
Fischer F.D., Svoboda J., Petryk H., Thermodynamic extremal principles for irreversible processes in materials science, ACTA MATERIALIA, ISSN: 1359-6454, DOI: 10.1016/j.actamat.2013.11.050, Vol.67, No.153, pp.1-20, 2014

Abstract:
Mathematical and physical aspects of the applicability of the Onsager, Prigogine as well as the Glansdorff and Ziegler thermodynamic extremal principles (TEPs) to non-equilibrium thermodynamics are examined for systems at fixed temperature with respect to their ability to provide kinetic equations approved in materials science. TEPs represent an alternative to the classical phenomenological equations approach. As TEPs are, more or less, a pure mathematical tool, they cannot significantly contribute to a deeper physical understanding. However, if a system can be described by discrete characteristic (thermodynamic) parameters, it is demonstrated that application of Onsager’s TEP or Ziegler’s TEP represents a systematic way to derive a set of explicit evolution equations for these parameters. This approach can significantly simplify the treatment of the problem and, thus, can also be applied to rather complex systems, for which the classical approach, involving application of phenomenological equations, fails. The application of TEPs is demonstrated on plasticity with respect to constitutive equations as well as on grain growth and coarsening with respect to evolution equations of discrete parameters. No exploitation of Prigogine’s TEP has been reported for applications in materials science. Contrarily, Prigogine’s TEP can be invalidated if the coefficients of the dissipation function depend on the evolution of state variables with time. This is demonstrated by a further practical example worked out for the solute drag phenomenon. Glansdorff’s and Prigogine’s evolution criterion, however, is always fulfilled near the equilibrium state of convex Gibbs energy. Extensions of TEPs to non-linear non-equilibrium thermodynamics are demonstrated for homogeneous and quasi-homogeneous dissipation functions.

Keywords:
Non-equilibrium, Thermodynamics, Entropy, Onsager’s principle, Thermodynamic extremal principles

45p.
8.Kursa M., Kowalczyk-Gajewska K., Petryk H., Multi-objective optimization of thermo-mechanical properties of metal-ceramic composites, COMPOSITES PART B-ENGINEERING, ISSN: 1359-8368, DOI: 10.1016/j.compositesb.2014.01.009, Vol.60, pp.586-596, 2014
Kursa M., Kowalczyk-Gajewska K., Petryk H., Multi-objective optimization of thermo-mechanical properties of metal-ceramic composites, COMPOSITES PART B-ENGINEERING, ISSN: 1359-8368, DOI: 10.1016/j.compositesb.2014.01.009, Vol.60, pp.586-596, 2014

Abstract:
The optimization procedure is worked out for finding an optimal content of phases in metal–ceramic composites in case of conflicting objectives regarding thermo-mechanical properties of the material for a specific target application. Relationships between the material composition and effective properties of the composite are calculated by employing several methods of continuum micromechanics. A constrained minimization problem is solved for a single objective function based on the weighted squared distances from the best available thermo-mechanical properties for the material system selected. A compound block diagram is proposed for quick assessment of the consequences of deviating from the optimal composition. The developed procedure is applied to practical examples of Al2O3–Cu composites for brake disks and Al2O3–NiAl composites for valves of potential use in automotive industry.

Keywords:
Metal–matrix composites (MMCs), Thermomechanical, Plastic deformation, Micro-mechanics, Multi-criteria optimization

40p.
9.Kucharski S., Stupkiewicz S., Petryk H., Surface Pile-Up Patterns in Indentation Testing of Cu Single Crystals, EXPERIMENTAL MECHANICS, ISSN: 0014-4851, DOI: 10.1007/s11340-014-9883-1, Vol.54, pp.957-969, 2014
Kucharski S., Stupkiewicz S., Petryk H., Surface Pile-Up Patterns in Indentation Testing of Cu Single Crystals, EXPERIMENTAL MECHANICS, ISSN: 0014-4851, DOI: 10.1007/s11340-014-9883-1, Vol.54, pp.957-969, 2014

Abstract:
Nano- and micro-indentation of Cu single crystals is performed in directions not aligned with crystallographic axes. Such tests correspond to mechanical characterization of incidentally oriented grains in a polycrystalline or composite material. Orientation and size dependence of complex patterns of surface piling-up and sinking-in around the imprint are investigated. Experimental observations are compared with finite element simulations based on the large deformation crystal plasticity theory.

Keywords:
Copper, Nanoindentation, AFM, EBSD, Crystal plasticity, Finite element method

35p.
10.Stupkiewicz S., Petryk H., A robust model of pseudoelasticity in shape memory alloys, INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, ISSN: 0029-5981, DOI: 10.1002/nme.4405, Vol.93, No.7, pp.747-769, 2013
Stupkiewicz S., Petryk H., A robust model of pseudoelasticity in shape memory alloys, INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, ISSN: 0029-5981, DOI: 10.1002/nme.4405, Vol.93, No.7, pp.747-769, 2013

Abstract:
A model of pseudoelasticity in shape memory alloys is developed within the incremental energy minimization framework. Three constitutive functions are involved: the Helmholtz free energy and rate-independent dissipation that enter incrementally the minimized energy function, and the constraint function that defines the limit transformation strains. The proposed implementation is based on a unified augmented Lagrangian treatment of both the constitutive constraints and nonsmooth dissipation function. A methodology for easy reformulation of the model from the small-strain to finite-deformation regime is presented. Finite element computations demonstrate robustness of the finite-strain version of the model and illustrate the effects of tension–compression asymmetry and transversal isotropy of the surface of limit transformation strains.

Keywords:
shape memory alloys (SMA), phase transformation, energy methods, finite element method, augmented Lagrangian method

40p.
11.Petryk H., Kursa M., The energy criterion for deformation banding in ductile single crystals, JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, ISSN: 0022-5096, DOI: 10.1016/j.jmps.2013.03.004, Vol.61, No.8, pp.1854-1875, 2013
Petryk H., Kursa M., The energy criterion for deformation banding in ductile single crystals, JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, ISSN: 0022-5096, DOI: 10.1016/j.jmps.2013.03.004, Vol.61, No.8, pp.1854-1875, 2013

Abstract:
The phenomenon of spontaneous formation of deformation bands in metal single crystals deformed plastically by crystallographic multislip is investigated theoretically by using the energy criterion of instability of a uniform deformation path. The second-order energy criterion for incipient deformation banding is derived in a time-continuous setting for a rate-independent elastic–plastic crystal. The need for selective symmetrization of the local interaction matrix for active slip-systems is demonstrated. A computational approach to deformation banding is developed by using non-convex constrained minimization of the incremental work with respect to increments in crystallographic shears and kinematical degrees of freedom. Calculated examples of deformation banding patterns in fcc single crystals are compared with experimental observations.

Keywords:
Metal crystal, Plasticity, Finite deformation, Laminate microstructure, Incremental energy minimization

40p.
12.Petryk H., Stupkiewicz S., Instability of equilibrium of evolving laminates in pseudo-elastic solids, INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS, ISSN: 0020-7462, DOI: 10.1016/j.ijnonlinmec.2011.07.005, Vol.47, pp.317-330, 2012
Petryk H., Stupkiewicz S., Instability of equilibrium of evolving laminates in pseudo-elastic solids, INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS, ISSN: 0020-7462, DOI: 10.1016/j.ijnonlinmec.2011.07.005, Vol.47, pp.317-330, 2012

Abstract:
This study is concerned with isothermal stability of equilibrium of evolving laminated microstructures in pseudo-elastic solids with a multi-well free energy function. Several possible modes of instability associated with phase transition between energy wells are analysed. The related rate-independent dissipation is included by imposing a threshold value on the thermodynamic driving force. For a homogenized phase-transforming laminate with no length scale it is shown that localization instability is a rule in case of a non-zero interfacial jump of a directional nominal stress, irrespectively of actual boundary conditions. A stabilizing effect of elastic micro-strain energy at the boundary of the localization zone is demonstrated for laminates of finite spacing. Illustrative numerical examples are given for an evolving austenite–martensite laminate in a crystal of CuZnAl shape memory alloy.

Keywords:
Microstructures, Phase transformation, Laminates, Energy methods, Stability

35p.
13.Petryk H., Stupkiewicz S., Modelling of microstructural evolution on complex paths of large plastic deformation, INTERNATIONAL JOURNAL OF MATERIALS RESEARCH, ISSN: 1862-5282, DOI: 10.3139/146.110683, Vol.103, No.3, pp.271-277, 2012
Petryk H., Stupkiewicz S., Modelling of microstructural evolution on complex paths of large plastic deformation, INTERNATIONAL JOURNAL OF MATERIALS RESEARCH, ISSN: 1862-5282, DOI: 10.3139/146.110683, Vol.103, No.3, pp.271-277, 2012

Abstract:
A procedure for the modelling of microstructural changes induced by non-uniform large plastic deformation of metals is developed. For a given plastic working process, a set of deformation paths for different initial locations of a material element is generated first for a non-hardening material by using the finite element method. Next, changes of a cellular microstructure and related hardening effects along each path are calculated by using a recently proposed model. The procedure is applied to a non-conventional process of cold extrusion assisted by cyclic rotation of the die. The evolution of microstructural parameters, their effect on strain hardening and a distribution map over the specimen cross-section are calculated.

Keywords:
non-uniform deformation, dislocation cells, grain refinement, hardening, quantitative prediction

30p.
14.Stupkiewicz S., Maciejewski G., Petryk H., Elastic micro-strain energy of austenite–martensite interface in NiTi, MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING, ISSN: 0965-0393, DOI: 10.1088/0965-0393/20/3/035001, Vol.20, pp.035001-9, 2012
Stupkiewicz S., Maciejewski G., Petryk H., Elastic micro-strain energy of austenite–martensite interface in NiTi, MODELLING AND SIMULATION IN MATERIALS SCIENCE AND ENGINEERING, ISSN: 0965-0393, DOI: 10.1088/0965-0393/20/3/035001, Vol.20, pp.035001-9, 2012

Abstract:
The interfacial energy due to elastic micro-strains at the austenite–twinned martensite interface is calculated for the NiTi shape memory alloy undergoing cubic-to-monoclinic B2 ↔ B19' transformation. For each crystallographically distinct microstructure, an energetically favourable local shape of the interface is determined. The approach employs finite element computations and energy minimization with respect to shape parameters, taking into account elastic anisotropy of the phases and finite-strain kinematics. The effect of atomic-scale interfacial energy is studied.

Keywords:
microstructure, martensitic phase transformation, shape memory alloys (SMA), interface structure, micromechanical modelling

30p.
15.Kowalczyk-Gajewska K., Petryk H., Sequential linearization method for viscous/elastic heterogeneous materials, EUROPEAN JOURNAL OF MECHANICS A-SOLIDS, ISSN: 0997-7538, Vol.30, No.5, pp.650-664, 2011
Kowalczyk-Gajewska K., Petryk H., Sequential linearization method for viscous/elastic heterogeneous materials, EUROPEAN JOURNAL OF MECHANICS A-SOLIDS, ISSN: 0997-7538, Vol.30, No.5, pp.650-664, 2011

Abstract:
The paper addresses the problem of suitable approximation of the interaction between phases in heterogeneous materials that exhibit both viscous and elastic properties. A novel approach is proposed in which linearized subproblems for an inhomogeneity-matrix system with viscous or elastic interaction rules are solved sequentially within one incremental step. It is demonstrated that in the case of a self-consistent averaging scheme, an additional accommodation subproblem, besides purely viscous and elastic subproblems, is to be solved in order to estimate the material response satisfactorily. By examples of an isotropic two-phase material it is shown that the proposed approach provides acceptable predictions in comparison with the existing models.

Keywords:
Micromechanics, Viscoelasticity, Viscoplasticity, Homogenization, Self-consistent scheme

30p.
16.Petryk H., Kursa M., Selective symmetrization of the slip-system interaction matrix in crystal plasticity, ARCHIVES OF MECHANICS, ISSN: 0373-2029, Vol.63, No.3, pp.287-310, 2011
Petryk H., Kursa M., Selective symmetrization of the slip-system interaction matrix in crystal plasticity, ARCHIVES OF MECHANICS, ISSN: 0373-2029, Vol.63, No.3, pp.287-310, 2011

Abstract:
The symmetry issue of the interaction matrix between multiple slip-systems in the theory of crystal plasticity at finite deformation is revisited. By appealing to possibly non-uniform distribution of slip-system activity in a representative space-time element of a crystal, symmetry of the slip-system interaction matrix for the representative element is derived under assumptions that have a physical meaning. This conclusion refers to active slip-systems only. Accordingly, for any given hardening law, a new symmetrization rule is proposed that is restricted to active slip-systems and leaves the latent hardening of inactive slip-systems unchanged. Advantages of the proposal in comparison with full symmetrization are illustrated by a simple example of uniaxial tension.

Keywords:
finite deformation, metal crystal, plasticity, hardening, symmetry

20p.
17.Stupkiewicz S., Petryk H., A bi-crystal aggregate model of pseudoelastic behaviour of shape-memory alloy polycrystals, INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, ISSN: 0020-7403, DOI: 10.1016/j.ijmecsci.2009.09.012, Vol.52, pp.219-228, 2010
Stupkiewicz S., Petryk H., A bi-crystal aggregate model of pseudoelastic behaviour of shape-memory alloy polycrystals, INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, ISSN: 0020-7403, DOI: 10.1016/j.ijmecsci.2009.09.012, Vol.52, pp.219-228, 2010

Abstract:
A multi-scale model of stress-induced phase transformation and martensite variant reorientation in shape memory alloy (SMA) polycrystals is developed. It is proposed to include neighbouring-grain interaction in a simple manner by introducing an intermediate bi-crystal level into the sequential averaging scheme for SMA. The constitutive relationships are defined by specifying the free energy and dissipation functions. At the level of a single grain, the rate-independent dissipation function is used that incorporates the dissipation due to forward and reverse austenite-to-martensite transformation as well as reorientation of martensite variants. The global response of the model is simulated numerically by minimizing the total incremental energy supply. Specific examples are calculated for a NiTi polycrystal for proportional and non-proportional loading paths.

Keywords:
Phase transformation, Dissipation, Microstructure, Multi-scale model, Incremental energy minimization

32p.
18.Petryk H., Stupkiewicz S., Interfacial energy and dissipation in martensitic phase transformations. Part I: Theory, JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, ISSN: 0022-5096, DOI: 10.1016/j.jmps.2009.11.004, Vol.58, pp.390-408, 2010
Petryk H., Stupkiewicz S., Interfacial energy and dissipation in martensitic phase transformations. Part I: Theory, JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, ISSN: 0022-5096, DOI: 10.1016/j.jmps.2009.11.004, Vol.58, pp.390-408, 2010

Abstract:
This paper is a continuation of the Part I (H. Petryk, S. Stupkiewicz, Interfacial energy and dissipation in martensitic phase transformations. Part I: Theory. J. Mech. Phys. Solids, 2010, doi:10.1016/j.jmps.2009.11.003). A fully three-dimensional model of an evolving martensitic microstructure is examined, taking into account size effects due to the interfacial energy and also dissipation related to annihilation of interfaces. The elastic micro-strain energy at microstructured interfaces is determined with the help of finite element computations and is approximated analytically. Three interface levels are examined: of grain boundaries attained by parallel martensite plates, of interfaces between austenite and twinned martensite, and of twin interfaces within the martensite phase. Minimization of the incremental energy supply, being the sum of the increments in the free energy and dissipation of the bulk and interfacial type at all levels, is used as the evolution rule, based on the theory presented in Part I. An example of the formation and evolution of a rank-three laminated microstructure of finite characteristic dimensions in a pseudoelastic CuAlNi shape memory alloy is examined quantitatively.

Keywords:
Microstructures, Phase transformation, Grain boundaries, Energy methods, Shape memory alloys (SMA)

32p.
19.Petryk H., Stupkiewicz S., Maciejewski G., Interfacial energy and dissipation in martensitic phase transformations. Part II: Size effects in pseudoelasticity, JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, ISSN: 0022-5096, DOI: 10.1016/j.jmps.2009.11.003, Vol.58, pp.373-389, 2010
Petryk H., Stupkiewicz S., Maciejewski G., Interfacial energy and dissipation in martensitic phase transformations. Part II: Size effects in pseudoelasticity, JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS, ISSN: 0022-5096, DOI: 10.1016/j.jmps.2009.11.003, Vol.58, pp.373-389, 2010

Abstract:
A model of evolving martensitic microstructures is formulated that incorporates the interfacial energy and dissipation on three different scales corresponding to the grain boundaries attained by martensite plates, the interfaces between austenite and martensite plates, and the twin interfaces within martensite plates. Three different time scales are also considered in order to clarify the meaning of rate-independent dissipation related to instabilities at more refined temporal and spatial scales. On the slowest time scale, the process of deformation and martensitic phase transformation is investigated as being composed of segments of smooth quasi-static evolution separated by sudden jumps associated with creation or annihilation of interfaces. A general evolution rule is used in the form of minimization of the incremental energy supply to the whole compound thermodynamic system, including the rate-independent dissipation. Close relationship is shown between the evolution rule and the thermodynamic condition for stability of equilibrium, with no a priori assumption on convexity of the dissipation function. It is demonstrated that the extension of the minimum principle from the first-order rates to small but finite increments requires a separate symmetry restriction imposed on the state derivative of the dissipation function. Formulae for the dissipation associated with annihilation of interfaces are proposed that exhibit limited path-independence and satisfy that symmetry requirement. By exploiting the incremental energy minimization rule with the help of the transport theorems, local propagation conditions are derived for both planar and curved phase transformation fronts. The theory serves as a basis for the algorithm for calculation of the stress-induced evolution of martensitic microstructures along with their characteristic dimensions and related hysteresis loops in shape memory alloys; the examples are given in Part II of the paper.

Keywords:
Microstructures, Phase transformation, Grain boundaries, Energy methods, Stability

32p.
20.Stupkiewicz S., Petryk H., Grain-size effect in micromechanical modelling of hysteresis in shape memory alloys, ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK, ISSN: 0044-2267, DOI: 10.1002/zamm.201000008, Vol.90, pp.783-795, 2010
Stupkiewicz S., Petryk H., Grain-size effect in micromechanical modelling of hysteresis in shape memory alloys, ZAMM-ZEITSCHRIFT FUR ANGEWANDTE MATHEMATIK UND MECHANIK, ISSN: 0044-2267, DOI: 10.1002/zamm.201000008, Vol.90, pp.783-795, 2010

Abstract:
Size effects in pseudoelastic polycrystalline shape memory alloys are studied by considering a representative spherical laminated domain (subgrain) and its interfacial energy at three scales: at the subgrain boundaries, at the austenite–martensite interfaces, and at the twin boundaries. Two sources of interfacial energy are accounted for, namely the atomic-scale energy of twin and phase boundaries and the elastic strain energy at microstructured interfaces, the latter being predicted theoretically. The evolution of microstructure of the representative domain is determined using the incremental energy minimization rule applied to the sum of the increments in the Helmholtz free energy and rate-independent dissipation. The size-dependent part of dissipation is estimated by assuming that negative increments in interfacial energy, associated with annihilation of interfaces, cannot be reverted back into the bulk free energy and are thus dissipated. Simple analytic formula for the interfacial energy dissipated in a complete forward-reverse transformation cycle is derived and combined with a micromechanical model of a polycrystalline NiTi shape memory alloy. A numerical example illustrating size-dependent hysteresis in the stress-induced martensitic transformation is presented.

Keywords:
interfacial energy, incremental energy minimization, dissipation, martensitic transformation

20p.
21.Petryk H., Stupkiewicz S., Energia powierzchniowa, dyssypacja i efekty skali w modelowaniu mikrostruktur martenzytycznych, Czasopismo Techniczne. Mechanika, ISSN: 0011-4561, Vol.107, No.20, pp.99-108, 2010
Petryk H., Stupkiewicz S., Energia powierzchniowa, dyssypacja i efekty skali w modelowaniu mikrostruktur martenzytycznych, Czasopismo Techniczne. Mechanika, ISSN: 0011-4561, Vol.107, No.20, pp.99-108, 2010

Abstract:
W niniejszym artykule przedstawiono energetyczne podejście do wieloskalowego modelowania ewolucji mikrostruktur martenzytycznych w stopach z pamięcią kształtu. Energia swobodna Helmholtza i energia dyssypowana w układzie reprezentowane są przez sumy członów odpowiadających energii objętościowej oraz energii powierzchniowej na granicach mikro-strukturalnych pomiędzy poszczególnymi wariantami martenzytu, fazami lub ziarnami. Ewolucja mikrostruktury jest wyznaczana drogą przyrostowej minimalizacji całkowitej energii dostarczanej do rozpatrywanego układu w procesie makroskopowo quasi-statycznym i izotermicznym. Ogólną procedurę zastosowano do numerycznych symulacji powstawania i ewolucji warstwowych struktur martenzytycznych indukowanych naprężeniowo w stopach z pamięcią kształtu. W energii powierzchniowej uwzględniono energię mikroodkształceń sprężystych w otoczeniu granic mikrostrukturalnych, wyznaczoną przy użyciu metody elementów skończonych. Policzone przykłady opisują ewolucję mikrostruktury martenzytycznej w formie laminatu trzeciego rzędu w stopie CuAlNi dla przemiany β1→γ1′ oraz jej zależność od sposobu uwzględnienia dyssypacji energii powierzchniowej.

Keywords:
energia powierzchniowa, minimalizacja energii, przemiana martenzytyczna

6p.
22.Petryk H., Stupkiewicz S., Kuziak R., Grain refinement and strain hardening in IF steel during multi-axis compression: Experiment and modelling, JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, ISSN: 0924-0136, DOI: 10.1016/j.jmatprotec.2007.11.068, Vol.204, pp.255-263, 2008
Petryk H., Stupkiewicz S., Kuziak R., Grain refinement and strain hardening in IF steel during multi-axis compression: Experiment and modelling, JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, ISSN: 0924-0136, DOI: 10.1016/j.jmatprotec.2007.11.068, Vol.204, pp.255-263, 2008

Abstract:
The effect of severe plastic deformation (SPD) during cyclic multi-axis compression on grain refinement and strain hardening in interstitial free (IF) steel is studied quantitatively. In the experimental part, the material samples were cold deformed in the MAXStrain(R) system by successive compression in two mutually orthogonal directions. The electron backscatter diffraction (EBSD) technique was used to measure the average spacing of the dislocation cell (low angle) and cell-block (high angle) boundaries. In the modelling part, the decrease in size of dislocation cells and cell blocks was expressed in terms of the effective plastic strain defined such that strain-rate reversals slow down its accumulation. The strengthening effect of microstructural evolution was included in the continuum mechanics framework of finite strain plasticity. Examples of simulation of the behaviour of IF steel severely deformed by multi-axis compression are calculated and compared to experimental data.

Keywords:
Modelling, Microstructure, Hardening, Severe plastic deformation

27p.
23.Stupkiewicz S., Maciejewski G., Petryk H., Low-energy morphology of the interface layer between austenite and twinned martensite, ACTA MATERIALIA, ISSN: 1359-6454, DOI: 10.1016/j.actamat.2007.07.034, Vol.55, No.18, pp.6292-6306, 2007
Stupkiewicz S., Maciejewski G., Petryk H., Low-energy morphology of the interface layer between austenite and twinned martensite, ACTA MATERIALIA, ISSN: 1359-6454, DOI: 10.1016/j.actamat.2007.07.034, Vol.55, No.18, pp.6292-6306, 2007

Abstract:
A micromechanical scheme is developed for predicting the morphology and interfacial energy of the interface layer between the parent phase and internally twinned martensite. Low-energy morphologies are determined by minimizing, with respect to shape parameters, the elastic microstrain energy associated with local incompatibility of transformation strains. The computational scheme involves a finite element solution to a problem of non-linear elasticity with eigenstrains, shape sensitivity analysis with respect to general shape parametrization and minimization employing a gradient-based algorithm. As an application, low-energy morphologies are studied for the austenite–martensite interface in the cubic-to-orthorhombic transformation in a CuAlNi shape memory alloy. Discussion of the results of the analysis includes comparison to alternative simplified methods in terms of the predicted morphologies and the corresponding interfacial energies.

Keywords:
Microstructure, Martensitic phase transformation, Shape memory alloys (SMA), Interface structure, Micromechanical modelling

32p.
24.Petryk H., Stupkiewicz S., A quantitative model of grain refinement and strain hardening during severe plastic deformation, MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2006.08.076, Vol.444, pp.214-219, 2007
Petryk H., Stupkiewicz S., A quantitative model of grain refinement and strain hardening during severe plastic deformation, MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2006.08.076, Vol.444, pp.214-219, 2007

Abstract:
The effect of severe plastic deformation (SPD) on grain refinement and strain hardening in polycrystalline metals is studied quantitatively. The decrease in size of dislocation cells and cell-blocks is expressed as a function of the effective plastic strain influenced by strain-rate reversals. The estimated growth of the high-angle boundary area fraction depends on the complexity of the three-dimensional deformation path. The strain hardening due to both dislocation and boundary strengthening is described in terms of microstructural parameters and incorporated in the continuum mechanics framework of finite strain plasticity. The proposed model provides a tool for quantitative comparison of different SPD processes. Examples of simulation of the behaviour of pure aluminium deformed by equal channel angular pressing (ECAP) and cyclic extrusion–compression are calculated.

Keywords:
Modelling, Microstructure, Severe plastic deformation, Ultra-fine grained materials

27p.
25.Schurig M., Bertram A., Petryk H., Micromechanical analysis of the development of a yield vertex in polycrystal plasticity, ACTA MECHANICA, ISSN: 0001-5970, DOI: 10.1007/s00707-007-0462-8, Vol.194, pp.141-158, 2007
Schurig M., Bertram A., Petryk H., Micromechanical analysis of the development of a yield vertex in polycrystal plasticity, ACTA MECHANICA, ISSN: 0001-5970, DOI: 10.1007/s00707-007-0462-8, Vol.194, pp.141-158, 2007

Abstract:
The Taylor-Lin polycrystal model is used to simulate plastic deformations of a polycrystal. These propagate a corner in the subsequent yield surface due to the intersection of the yield loci of a number of slip mechanisms. Two approaches to identify subsequent yield surfaces and the development of the yield vertex at the applied stress are discussed. A linear regression analysis of the rounded corner is used to identify the corner angle and its development for different strain processes. On deformation paths composed of two aligned segments, the development of a secondary vertex is shown to follow similar laws.

27p.
26.Richert M., Petryk H., Stupkiewicz S., Grain refinement in AlMgSi alloy during cyclic extrusion-compression: Experiment and modelling, ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, Vol.52, pp.49-54, 2007
Richert M., Petryk H., Stupkiewicz S., Grain refinement in AlMgSi alloy during cyclic extrusion-compression: Experiment and modelling, ARCHIVES OF METALLURGY AND MATERIALS, ISSN: 1733-3490, Vol.52, pp.49-54, 2007

Abstract:
The effect of severe plastic deformation (SPD) during cyclic extrusion-compression (CEC) on grain refinement and strain hardening in AlMgSi alloy is studied quantitatively. New experimental results are presented showing that the average microband thickness and grain size decrease below 100 nm, i.e. a nanocrystalline material is obtained. In the modelling part, the decrease in size of dislocation cells and microbands is expressed in terms of the effective plastic strain defined such that strain rate reversals slow down its accumulation. Examples of simulation of the behaviour of AlMgSi alloy severely deformed by cyclic extrusion-compression are calculated and compared to experimental data.

Keywords:
Modelling, Microstructure, Hardening, Severe plastic deformation

20p.
27.Maciejewski J., Kopeć H., Petryk H., Finite element analysis of strain non-uniformity in two processes of severe plastic deformation, ENGINEERING TRANSACTIONS (ROZPRAWY INŻYNIERSKIE), ISSN: 0867-888X, Vol.55, No.3, pp.197-216, 2007
Maciejewski J., Kopeć H., Petryk H., Finite element analysis of strain non-uniformity in two processes of severe plastic deformation, ENGINEERING TRANSACTIONS (ROZPRAWY INŻYNIERSKIE), ISSN: 0867-888X, Vol.55, No.3, pp.197-216, 2007

Abstract:
Two severe plastic deformation (SPD) processing techniques, namely equal-channel angular pressing (ECAP) and cyclic extrusion-compression (CEC), are investigated by using the finite element method. The major aspect examined is the non-uniformity of the accumulated, equivalent plastic strain after processing with the use of different shapes of the die. The quantitative effect of several parameters on the plastic flow is determined. It is found that the diameter ratio of the chambers and narrower channel in the CEC method, and also the inclination angle of connecting conical parts, can affect strongly the degree of strain non-uniformity. Comparison is made of distributions of equivalent strain after two passes of ECAP for two different routes and with two die profiles.

6p.
28.Stupkiewicz S., Petryk H., Finite-strain micromechanical model of stress-induced martensitic transformations in shape memory alloys, MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2006.01.112, Vol.438-440, pp.126-130, 2006
Stupkiewicz S., Petryk H., Finite-strain micromechanical model of stress-induced martensitic transformations in shape memory alloys, MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2006.01.112, Vol.438-440, pp.126-130, 2006

Abstract:
A micromechanical model of stress-induced martensitic transformation in single crystals of shape memory alloys is developed. This model is a finite-strain counterpart to the approach presented recently in the small-strain setting [S. Stupkiewicz, H. Petryk, J. Mech. Phys. Solids 50 (2002) 2303–2331]. The stress-induced transformation is assumed to proceed by the formation and growth of parallel martensite plates within the austenite matrix. Propagation of phase transformation fronts is governed by a rate-independent thermodynamic criterion with a threshold value for the thermodynamic driving force, including in this way the intrinsic dissipation due to phase transition. This criterion selects the initial microstructure at the onset of transformation and governs the evolution of the laminated microstructure at the macroscopic level. A multiplicative decomposition of the deformation gradient into elastic and transformation parts is assumed, with full account for the elastic anisotropy of the phases. The pseudoelastic behavior of Cu–Zn–Al single crystal in tension and compression is studied as an application of the model.

Keywords:
Microstructures, Laminates, Finite deformations, Micromechanics, Shape memory alloys

27p.
29.Petryk H., Thermodynamic conditions for stability in materials with rate-independent dissipation, PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, ISSN: 1364-503X, DOI: 10.1098/rsta.2005.1584, Vol.A363, pp.2479-2515, 2005
Petryk H., Thermodynamic conditions for stability in materials with rate-independent dissipation, PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES, ISSN: 1364-503X, DOI: 10.1098/rsta.2005.1584, Vol.A363, pp.2479-2515, 2005

Abstract:
A distinctive feature of the examined class of solids is that a part of the entropy production is due to rate-independent dissipation, as in models of plasticity, damage or martensitic transformations. The standard condition for thermodynamic stability is shown to be too restrictive for such solids and, therefore, an extended condition for stability of equilibrium is developed. The classical thermodynamic theory of irreversible processes is used along with the internal variable approach, with the emphasis on the macroscopic effects of micro-scale instabilities in the presence of two different scales of time. Specific conditions for material stability against internal structural rearrangements under deformation-sensitive loading are derived within the incremental constitutive framework of multi-mode inelasticity. Application to spontaneous formation of deformation bands in a continuum is presented. Conditions for stability or instability of a quasi-static process induced by varying loading are given under additional constitutive postulates of normality and symmetry. As illustration of the theory, the stability of equilibrium or a deformation path under uniaxial tension is analysed for a class of inelastic constitutive laws for a metal crystal deformed plastically by multi-slip or undergoing stress-induced martensitic transformation.

32p.
30.Maciejewski G., Stupkiewicz S., Petryk H., Elastic micro-strain energy at the austenite-twinned martensite interface, ARCHIVES OF MECHANICS, ISSN: 0373-2029, Vol.57, No.4, pp.277-297, 2005
Maciejewski G., Stupkiewicz S., Petryk H., Elastic micro-strain energy at the austenite-twinned martensite interface, ARCHIVES OF MECHANICS, ISSN: 0373-2029, Vol.57, No.4, pp.277-297, 2005

Abstract:
A micromechanical scheme is developed for the analysis of elastic micro-strains induced by local incompatibilities at the austenite-twinned martensite interface. The aim of the paper is to estimate the elastic micro-strain energy which is an important factor in the formation of microstructures during the martensitic transformation. The finite deformation framework is applied, consistent with the crystallographic theory of martensite, and full account is taken for elastic anisotropy of the phases. As an example, the microstructures in the cubic-to-orthorhombic transformation in CuAlNi shape memory alloy are analyzed by the finite element method for the assumed class of zigzag shapes of the austenite-martensite interface at the micro-level. Finally, the effect of the interphase boundary energy on the microstructure of the transition layer is studied.

Keywords:
microstructure, martensitic phase transformation, shape memory alloys (SMA), interface structure, micromechanical modelling

27p.

Lista rozdziałów w ostatnich monografiach
1.
212
Petryk H., Stupkiewicz S., Workshop in Memory of Prof. J.R. Klepaczko: Dynamic Behaviour of Materials, rozdział: Modelling of strain hardening and grain refinement during severe plastic deformation, LPMM, Metz, Rusinek A., Chevrier P. (Eds.), pp.43-50, 2009
2.
159
Petryk H., Stupkiewicz S., Maciejewski G., IUTAM Symposium on size effects on material and structural behaviour at micron- and nano-scales, rozdział: Modelling of austenite/martensite laminates with interfacial energy effect, Springer, Tong P., Sun Q.P. (Eds.), pp.151-162, 2006
3.
182
Petryk H., Stupkiewicz S., Maciejewski G., Proceedings IUTAM Symp. on Size Effects on Material and Structural Behaviour at Micron- and Nano-scales, rozdział: Modeling of austenite/martensite laminates with interfacial energy effect, Springer, pp.151-162, 2006

Prace konferencyjne
1.Kowalczyk-Gajewska K., Stupkiewicz S., Frydrych K., Petryk H., Modelling of Texture Evolution and Grain Refinement on Complex SPD Paths, JOURNAL OF PHYSICS: CONFERENCE SERIES, ISSN: 1742-6588, DOI: 10.1088/1757-899X/63/1/012040, No.63, pp.012040-1-10, 2014
Kowalczyk-Gajewska K., Stupkiewicz S., Frydrych K., Petryk H., Modelling of Texture Evolution and Grain Refinement on Complex SPD Paths, JOURNAL OF PHYSICS: CONFERENCE SERIES, ISSN: 1742-6588, DOI: 10.1088/1757-899X/63/1/012040, No.63, pp.012040-1-10, 2014

Abstract:
A computationally efficient procedure for modelling of microstructural changes on complex and spatially nonuniform deformation paths of severe plastic deformation (SPD) is presented. The analysis follows a two-step procedure. In the first step, motivated by saturation of material hardening at large accumulated strains, the steady-state kinematics of the process is generated for a non-hardening viscoplastic model by using the standard finite element method for a specified SPD scheme. In the second step, microstructural changes are investigated along the deformation-gradient trajectories determined in the first step for different initial locations of a material element. The aim of this study is to predict texture evolution and grain refinement in a non-conventional process of cold extrusion assisted by cyclic rotation of the die, called KOBO process, which leads to an ultra-fine grain structure. The texture evolution is calculated for fcc and hcp metals by applying crystal visco-plasticity combined with the self-consistent scale transition scheme. In parallel, by applying the simplified phenomenological model of microstructure evolution along the trajectories, grain refinement is modelled. The results are compared with available experimental data.

Keywords:
SPD processes, Texture evolution, UFG materials, Crystal plasticity, Grain refinement

10p.
2.Kursa M., Kowalczyk-Gajewska K., Petryk H., Multi-objective optimization of effective thermo-mechanical properties of metal-ceramic composites, ECCOMAX 2012, 6th European Congress on Computational Methods in Applied Sciences and Engineering, 2012-09-10/09-14, Wiedeń (AT), Vol.1, pp.1-9, 2012
Kursa M., Kowalczyk-Gajewska K., Petryk H., Multi-objective optimization of effective thermo-mechanical properties of metal-ceramic composites, ECCOMAX 2012, 6th European Congress on Computational Methods in Applied Sciences and Engineering, 2012-09-10/09-14, Wiedeń (AT), Vol.1, pp.1-9, 2012

Abstract:
Micromechanical modelling of metal-ceramic composites has been carried out to obtain a material of required thermo-mechanical properties. Quantitative transition from phase properties and morphology to macroscopic properties of a composite has been modelled by mean-field approaches, including the self-consistent scheme. An optimization method has been developed for the objective function that expresses a distance between the required values of macro-variables and those determined for a given set of microstructural parameters. The presented example concerns application of Al2O3-Cu composite to brake disks.

Keywords:
multi-objective optimization, composite selection, metal matrix composites


Abstrakty konferencyjne
1.Tůma K., Stupkiewicz S., Petryk H., The effect of twin spacing on the morphology of austenite-twinned martensite interface, SolMech 2016, 40th Solid Mechanics Conference, 2016-08-29/09-02, Warszawa (PL), No.P069, pp.1, 2016
2.Kursa M., Petryk H., Algorithm for rate-independent plasticity of single crystals based on incremental work minimization, SolMech 2016, 40th Solid Mechanics Conference, 2016-08-29/09-02, Warszawa (PL), No.P180, pp.1-2, 2016
3.Kowalczyk-Gajewska K., Petryk H., The sequential self-consistent scheme for modelling elastic-viscoplastic polycrystals, ESMC 2015, 9th European Solid Mechanics Conference, 2015-07-06/07-10, Leganés-Madrid (ES), pp.#216-1-2, 2015
Kowalczyk-Gajewska K., Petryk H., The sequential self-consistent scheme for modelling elastic-viscoplastic polycrystals, ESMC 2015, 9th European Solid Mechanics Conference, 2015-07-06/07-10, Leganés-Madrid (ES), pp.#216-1-2, 2015

Abstract:
The application of the sequential method for estimating the mechanical response of elastic-viscoplastic polycrystals of high viscous anisotropy is discussed. The results are compared with other averaging schemes. Since the anisotropy of viscous response is high the estimated overall response is dramatically different for different averaging schemes. Additionally the effect of different linearization procedure for the viscous part is studied, denoted as secant, affine and tangent. The results are compared to the recent FFT analysis available in the literature. For the studied example the tangent variant provides the overall response that agrees best with the FFT predictions.

Keywords:
Micromechanics, Sequential linearization, Self-Consistent Scheme, Polycrystals

4.Petryk H., Kursa M., Constitutive and material instabilities in rate-independent single crystals deformed by multiple slip, ESMC 2015, 9th European Solid Mechanics Conference, 2015-07-06/07-10, Leganés-Madrid (ES), pp.#281-1-2, 2015
Petryk H., Kursa M., Constitutive and material instabilities in rate-independent single crystals deformed by multiple slip, ESMC 2015, 9th European Solid Mechanics Conference, 2015-07-06/07-10, Leganés-Madrid (ES), pp.#281-1-2, 2015

Keywords:
Crystal Plasticity, Slip-systems Selection, Incremental Energy Minimization

5.Tůma K., Stupkiewicz S., Petryk H., Phase-field modelling of twinning and martensitic transformation at finite strain, PCM-CMM 2015, 3rd Polish Congress of Mechanics and 21st Computer Methods in Mechanics, 2015-09-08/09-11, Gdańsk (PL), pp.815-816, 2015
Tůma K., Stupkiewicz S., Petryk H., Phase-field modelling of twinning and martensitic transformation at finite strain, PCM-CMM 2015, 3rd Polish Congress of Mechanics and 21st Computer Methods in Mechanics, 2015-09-08/09-11, Gdańsk (PL), pp.815-816, 2015

Abstract:
We develop a micromechanical phase-field model that describes the transformation between the austenite and twinned martensites. The new model constrains the volume fractions of both parent and internally twinned phases such that the physically motivated bounds are not violated. As an application, we studied the twinned martensite and austenite-martensite interfaces in the cubic-to-orthorhombic transformation in a CuAlNi shape memory alloy and estimated the elastic part of the interfacial energy.

6.Petryk H., Kursa M., The energy approach to rate-independent plasticity of metal single crystals, PCM-CMM 2015, 3rd Polish Congress of Mechanics and 21st Computer Methods in Mechanics, 2015-09-08/09-11, Gdańsk (PL), pp.683-684, 2015
Petryk H., Kursa M., The energy approach to rate-independent plasticity of metal single crystals, PCM-CMM 2015, 3rd Polish Congress of Mechanics and 21st Computer Methods in Mechanics, 2015-09-08/09-11, Gdańsk (PL), pp.683-684, 2015

Abstract:
In the modelling of metal single crystals in the framework of rate-independent plasticity, there are known difficulties caused by non-uniqueness in selection of active slip-systems. A related challenge is to predict emergence of non-uniform deformation patterns and the formation and evolution of experimentally observed microstructures. A new constitutive algorithm is presented that tackles those problems using the energy approach. It is based on asymptotically exact formulation of the set of constitutive equations and inequalities as a minimum problem for the incremental work expressed by a quadratic function of non-negative crystallographic slips. The calculated examples of deformation banding patterns and of reduction of multiplicity of active slip-systems in fcc single crystals are compared with the experimental observations.

Keywords:
crystal plasticity, slip-systems selection, incremental energy minimization