Stanisław Pietruszczak


Doktorat
1979Problemy brzegowe dla sprężysto-plastycznych modeli gruntów 
promotor -- prof. dr hab. inż. Zenon Mróz, IPPT PAN
334 
Ostatnie publikacje
1.Moallemi S., Pietruszczak S., Mróz Z., Deterministic size effect in concrete structures with account for chemo-mechanical loading, COMPUTERS AND STRUCTURES, ISSN: 0045-7949, DOI: 10.1016/j.compstruc.2016.10.003, Vol.182, pp.74-86, 2017

Streszczenie:

The work presented here is focused on examining the size effect in concrete structures subjected to different loading conditions, which include a chemo-mechanical interaction. The study involves extensive three dimensional finite element simulations, which incorporate a constitutive law with embedded discontinuity for tracing the propagation of damage pattern. The analysis deals with various mechanical scenarios that incorporate both a cohesive and frictional damage mechanism, as well as the effects of degradation of concrete triggered by continuing alkali-silica reaction (ASR). In the latter case, a chemo-plasticity framework is employed. The first set of simulations provides a deterministic assessment of the size effect in a series of three-point bending tests as well as compression tests. For continuing ASR, it is demonstrated that, by increasing the size of the structure, a spontaneous failure may occur under a sustained load. The numerical examples given here clearly show that the size effect is associated with propagation of localized damage whose rate is controlled by a suitably defined ‘characteristic length’.

Słowa kluczowe:

Size effect, Alkali-silica reaction, 3D crack propagation, Embedded discontinuity model, Bifurcation analysis

Afiliacje autorów:

Moallemi S.-McMaster University (CA)
Pietruszczak S.-other affiliation
Mróz Z.-IPPT PAN
40p.
2.Pietruszczak S., Mróz Z., On failure criteria for anisotropic cohesive-frictional materials, INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS, ISSN: 0363-9061, DOI: 10.1002/nag.141, Vol.25, No.5, pp.509-524, 2001

Streszczenie:

Anisotropic failure criteria are formulated using two different approaches. The first one employs a spatial distribution of strength parameters and defines the failure condition in terms of traction components acting on the critical plane. The second one incorporates a microstructure tensor and the relevant mixed invariants. Both formulations are illustrated by some numerical examples. In particular, the variation of strength with orientation of the sample is examined for a series of uniaxial compression tests.

Afiliacje autorów:

Pietruszczak S.-IPPT PAN
Mróz Z.-IPPT PAN
3.Pietruszczak S., Mróz Z., Formulation of anisotropic failure criteria incorporating a microstructure tensor, COMPUTERS AND GEOTECHNICS, ISSN: 0266-352X, DOI: 10.1016/S0266-352X(99)00034-8, Vol.26, No.2, pp.105-112, 2000

Streszczenie:

Anisotropy is inherently related to microstructural arrangement within a representative volume of material. The microstructure can be represented by a second order tensor whose eigenvectors specify the orientation of the axes of material symmetry. In this paper, failure criteria for geomaterials are formulated in terms of the stress state and a microstructure tensor. The classical criteria for isotropic materials are generalized for the case of orthotropy as well as transverse isotropy. The proposed approach is illustrated by a simple example demonstrating the sensitivity of the uniaxial strength of the material to the orientation of the sample relative to the loading direction.

Afiliacje autorów:

Pietruszczak S.-other affiliation
Mróz Z.-IPPT PAN
4.Mróz Z., Pietruszczak S., A constitutive model for sand with anisotropic hardening rule, INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS, ISSN: 0363-9061, DOI: 10.1002/nag.1610070304, Vol.7, No.3, pp.305-320, 1983

Streszczenie:

An anisotropic hardening model for sand or other granular materials is presented. The state of initial densification is represented by a configuration surface and the state of loading by a loading surface in the stress space. The domain of elastic response may not exist and the irreversible strain is assumed to occur for both active and reverse loading. The derived constitutive equations are applicable both for dense and loose sands. Some model predictions are compared with available experimental data for triaxial compression and extension under undrained condition.

Afiliacje autorów:

Mróz Z.-IPPT PAN
Pietruszczak S.-IPPT PAN
5.Pietruszczak S., Mróz Z., On hardening anisotropy of K0-consolidated clays, INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS, ISSN: 0363-9061, DOI: 10.1002/nag.1610070105, Vol.7, No.1, pp.19-38, 1983

Streszczenie:

The combined isotropic-kinematic hardening rule for clays is presented using the concept of a multisurface model discussed previously in Reference 1. The mechanical behaviour of clays after one-dimensional consolidation is next simulated for the axisymmetric stress stress state. A general three-dimensional formulation of constitutive relations is also presented.

Afiliacje autorów:

Pietruszczak S.-IPPT PAN
Mróz Z.-IPPT PAN
6.Pietruszczak S., Mróz Z., Finite element analysis of deformation of strain-softening materials, INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, ISSN: 0029-5981, DOI: 10.1002/nme.1620170303, Vol.17, No.3, pp.327-334, 1981

Streszczenie:

A finite element analysis of strain-softening materials is presented in which the shear band of prescribed thickness is assumed to exist within elements where maximal stress intensity is reached. The incremental stiffness matrix of the element is derived including shear band deformation. Examples presented in the Paper demonstrate that the load-displacement curve and the displacement field are not sensitive to the mesh size used in the solution.

Afiliacje autorów:

Pietruszczak S.-IPPT PAN
Mróz Z.-IPPT PAN
7.Pietruszczak S., Mróz Z., Numerical analysis of elastic-plastic compression of pillars accounting for material hardening and softening, International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts, ISSN: 1365-1609, DOI: 10.1016/0148-9062(80)91086-4, Vol.17, No.4, pp.199-207, 1980

Streszczenie:

An elastic-plastic model of rock or soil is assumed for which the yield condition depends on hydrostatic pressure and varying material density or porosity. The problem of compression of a finite rectangular pillar between two rigid plates is treated numerically in plane strain conditions by applying the ‘initial stress’ finite element incremental technique. The development of softening and hardening zones within the pillar is studied and related to the load carrying capacity of the pillar.

Afiliacje autorów:

Pietruszczak S.-other affiliation
Mróz Z.-IPPT PAN
8.Pietruszczak S., Problemy brzegowe dla sprężysto - plastycznych modeli gruntów (Praca doktorska), Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.23, pp.1-232, 1979
9.Mróz Z., Pietruszczak S., Description of polymer impregnated concrete, ARCHIVES OF CIVIL ENGINEERING, ISSN: 1230-2945, Vol.23, pp.107-124, 1977
10.Mróz Z., Pietruszczak S., Flexure and extension of concrete beams with polymer impregnated external layers, ARCHIVES OF CIVIL ENGINEERING, ISSN: 1230-2945, Vol.23, pp.125-144, 1977

Lista rozdziałów w ostatnich monografiach
1.
529
Pietruszczak S., Mróz Z., Mechanical Behavior of Anisotropic Solids / Comportment Méchanique des Solides Anisotropes, rozdział: Description of Anisotropic Consolidation of Clays, Springer Netherlands, pp.597-622, 1982