Prof. Alexis Rusinek, Ph.D., Dr. Habil.


Recent publications
1.Jia B., Rusinek A., Pesci R., Bahi S., Bernier R., Thermo-viscoplastic behavior of 304 austenitic stainless steel at various strain rates and temperatures: testing, modeling and validation, INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES, ISSN: 0020-7403, DOI: 10.1016/j.ijmecsci.2019.105356, Vol.170, pp.105356-1-18, 2020
Abstract:

This paper presents a systematic study of the thermo-viscoplastic behavior of a 304 austenitic stainless steel (ASS). The experiments were conducted over a wide range of strain rates (10−3 s−1 to 3270 s−1) and temperatures (-163°C to 172°C), for which the deformation behavior of 304 ASS becomes more complex due to the strain-induced martensitic transformation (SIMT) effect. Dynamic tests at low/elevated temperatures were conducted using the Hopkinson technique coupled with a cooling device/heating furnace, and temperature distribution within the specimen was verified to be uniform. Experimental results showed that the strain hardening rate of 304 ASS was strongly affected by SIMT effect. For quasi-static tests (10−3 s−1 to 1 s−1) at low temperatures (-163°C to -20°C), the stress-strain relations exhibited an S-shape and a second strain hardening phenomenon. The strain rate sensitivity and temperature sensitivity of 304 ASS were also different from metallic materials deformed by dislocation glide. Several unexpected phenomena including the negative strain rate sensitivity and the changing temperature sensitivity from quasi-static to dynamic tests were observed. Based on experimental results, an extension of the Rusinek-Klepaczko (RK) model considering SIMT effect was used to simulate the deformation behavior of 304 ASS: it predicted flow stress curves of 304 ASS above -60°C correctly. In addition, to validate the extended RK model and the identified model parameters, numerical simulations of ballistic impact tests of 304 ASS plates at various temperatures were carried out, showing a good agreement with experiments.

Keywords:

304 austenitic stainless steel, Strain rate sensitivity, Temperature sensitivity, Constitutive model, Ballistic impact test

Affiliations:
Jia B.-École nationale supérieure d'arts et métiers (FR)
Rusinek A.-IPPT PAN
Pesci R.-École nationale supérieure d'arts et métiers (FR)
Bahi S.-Lorraine University (FR)
Bernier R.-National Engineering School of Metz (ENIM) (FR)
2.Massaq A., Rusinek A., Klosak M., Bahi S., Arias A., Strain rate effect on the mechanical behavior of polyamide composites under compression loading, COMPOSITE STRUCTURES, ISSN: 0263-8223, DOI: 10.1016/j.compstruct.2019.01.101, Vol.214, pp.114-122, 2019
Abstract:

This paper presents an experimental study on the effect of strain rate on the compressive behavior of polyamide composites. Contrary to thermoset woven reinforced composites, thermoplastic woven reinforced composites have always received less interest despite its excellent damage and impact resistances. In this context, this work aims to study the behavior of fiber reinforced thermoplastic composites submitted to high strain rate in compression. The tested material is a thermoplastic composite made of armor tissue of equilibrate glass fiber and the matrix is composed of Polyamide 6 (PA6/Glass). The material is prepared with the fibers woven in 0/90 direction.The compressive mechanical response of PA6/Glass composite was determined in the transverse and longitudinal fibers directions at quasi-static and high strain rates. The hydraulic machine and Split Hopkinson Pressure Bar experiments were conducted to determine the dynamic and quasi static compressive deformation and fracture of the PA6/Glass at strain rates from 10−5 s−1 to 1 s−1 and 100 s−1 to 2500 s−1, respectively.In this work, the main goals were to determine the strain rate effect on: elastic modulus, failure stress and failure energy as a function of the loading direction. The strain rate sensitivity of the failure stress level and failure energy were observed. In addition, the failure mechanism was characterized by examining the fracture surfaces using the scanning electron microscopy (SEM) method.In quasi-static conditions of loading, the material reached its capacity due to the formation of shear bands, that concerned all three tested compression directions. In dynamics, the failure took place by shearing followed by delamination. In case of dynamic loading in the direction perpendicular to fibers, the observations made by SEM showed that the failure of the composite had a fragile nature.

Keywords:

Woven composite, Dynamic behaviour, Dynamic fracture, Split Hopkinson Pressure Bar, Failure energy, Anisotropy, Strain rate

Affiliations:
Massaq A.-Caddi Ayad University (MA)
Rusinek A.-IPPT PAN
Klosak M.-other affiliation
Bahi S.-Lorraine University (FR)
Arias A.-other affiliation
3.Stańczak M., Fras T., Blanc L., Pawłowski P., Rusinek A., Blast-Induced Compression of a Thin-Walled Aluminum Honeycomb Structure—Experiment and Modeling, Metals, ISSN: 2075-4701, DOI: 10.3390/met9121350, Vol.9, No.12, pp.1350-1-24, 2019
Abstract:

The presented discussion concerns the behavior of a thin-walled hexagonal aluminum honeycomb structure subjected to blast loading. The shock wave affecting the structure is generated by detonation of the C4 charge in an explosive-driven shock tube (EDST). The EDST set-up is an instrumented device that makes it possible to study blast effects in more stable and repeatable conditions than those obtained in a free-air detonation. The formation of folds characteristic of a honeycomb deformation in the axial compression distributes the initial loading over a time period, which is considered as an efficient method of energy dissipation. The test configuration is modeled in the Ls-Dyna explicit code, which enables analysis of the mechanisms of energy absorption that accompanies structural deformation under a blast loading. The conclusions reached in the performed experimental and numerical investigation can be applied to the modeling and optimization of cellular structures used to mitigate blast loadings.

Keywords:

thin-walled hexagonal aluminum honeycomb; dynamic compression; blast energy absorption; EDST; numerical simulation of blast effects

Affiliations:
Stańczak M.-French-German Research Institute of Saint-Louis (FR)
Fras T.-French-German Research Institute of Saint-Louis (FR)
Blanc L.-French-German Research Institute of Saint-Louis (FR)
Pawłowski P.-IPPT PAN
Rusinek A.-other affiliation
4.Frąś T., Rusinek A., Pęcherski R.B., Bernier R., Jankowiak T., Analysis of friction influence on material deformation under biaxial compression state, TRIBOLOGY INTERNATIONAL, ISSN: 0301-679X, DOI: 10.1016/j.triboint.2014.06.019, Vol.80, pp.14-24, 2014
Abstract:

The biaxial compression test, based on the concept presented in [1] and on the technique of the channel-die test [2] and [3], is discussed as an experimental method allowing evolution of the friction conditions from the dry-film lubrication, by using MoS2 grease, to the dry conditions to be analysed. This article gives an outline of the experimental set-up, its validation and the technique of the test results analysis. The analysis of friction is based on the experimental data coupled with the numerical simulation of the performed tests and on the theoretical approach introduced in [4]. The Oxygen-Free High Conductivity (OFHC) copper in the ‘as-received’ state in contact with the 42CrMo4 steel are chosen as the materials used for the experimental investigation.

Keywords:

Biaxial compression, Friction modelling, OFHC copper

Affiliations:
Frąś T.-other affiliation
Rusinek A.-other affiliation
Pęcherski R.B.-other affiliation
Bernier R.-National Engineering School of Metz (ENIM) (FR)
Jankowiak T.-other affiliation
5.Frąś T., Nishida M., Rusinek A., Pęcherski R., Fukuda N., Description of the Yield State of Bioplastics on Examples of Starch-Based Plastics and PLA/PBAT Blends, ENGINEERING TRANSACTIONS (ROZPRAWY INŻYNIERSKIE), ISSN: 0867-888X, Vol.62, No.4, pp.329-354, 2014
Abstract:

The present work concerns the description of the yield state of biodegradable materials. As examples, biodegradable polymers are chosen – cornpole CRP-M2, starch fatty acid ester, and PLA/PBAT, poly(lactic acid) (PLA) blended with poly(butylene adipate/terephthalate) (PBAT) [1, 2]. These biodegradable, plant-derived bioplastics are a promising alternative to petroleum-based plastics. To describe the onset of plasticity in the bioplastics under discussion, Burzyński ’s hypothesis of material effort has been applied [3, 4]. The applied criteria account for the differential strength effect and for the shear correction resulting from the difference between experimental and theoretical values, obtained as a result of the Huber-Mises approach [5, 6]. In general, these properties of yield state are characteristic for polymers. The description of yield state for bioplastics is an issue that has hardly been investigated, which illustrates the novel nature of this paper in which this topic is discussed

Keywords:

bioplastics, strength differential effect, shear correction, yield surface, Burzyński yield condition

Affiliations:
Frąś T.-other affiliation
Nishida M.-Nagoya Institute of Technology (JP)
Rusinek A.-other affiliation
Pęcherski R.-IPPT PAN
Fukuda N.-Aichi Center for Industry and Science Technology (JP)
6.Moćko W., Rodriguez-Martinez J.A., Kowalewski Z.L., Rusinek A., Compressive Viscoplastic Response of 6082-T6 and 7075-T6 Aluminium Alloys Under Wide Range of Strain Rate at Room Temperature: Experiments and Modelling, STRAIN, ISSN: 0039-2103, Vol.48, pp.498-509, 2012
7.Frąś T., Kowalewski Z.L., Pęcherski R.B., Rusinek A., Applications of Burzyński failure criteria - I. Isotropic materials with asymmetry of elastic range, ENGINEERING TRANSACTIONS (ROZPRAWY INŻYNIERSKIE), ISSN: 0867-888X, Vol.58, pp.1-10, 2010
Abstract:

The main idea of energy-based hypothesis of material effort proposed by Burzyński is briefly presented and the resulting failure criteria are discussed. Some examples, based on the own studies, which depict applications of these criteria are discussed and visualisations of limit surfaces in the space of principal stresses are presented.

Keywords:

Burzyński yield condition, yield surface, strength differential effect, energy-based yield criteria

Affiliations:
Frąś T.-IPPT PAN
Kowalewski Z.L.-IPPT PAN
Pęcherski R.B.-IPPT PAN
Rusinek A.-other affiliation
8.Klepaczko J.R., Rusinek A., Rodriguez-Martinez J.A., Pęcherski R.B., Arias A., Modelling of thermo-viscoplastic behavior of DH-36 and Weldox 460-E structural steels at wide ranges of strain rates and temperatures, comparison of constitutive relations for impact problems, MECHANICS OF MATERIALS, ISSN: 0167-6636, Vol.41, No.5, pp.599-621, 2009
Abstract:

In this paper, the thermo-viscoplastic behaviour of DH-36 and Weldox-460-E steels is analyzed at wide ranges of strain rates and temperature. These materials are commonly used for naval applications. Thus, the may be subjected to a wide range of exploitation temperature and at the same time to high strain rates due to accidental impact or explosion. The thermo-viscoplastic behaviour of these materials has been modeled by application of RK (Rusinek-Klepaczko) constitutive relation. The comparison with other models well known in the literature has been studied.

Keywords:

constitutive modelling, thermo-viscoplasticity, DH-36 steel, Weldox-460-E steel, impact processes, FE numerical simulations, perforation process

Affiliations:
Klepaczko J.R.-IPPT PAN
Rusinek A.-other affiliation
Rodriguez-Martinez J.A.-other affiliation
Pęcherski R.B.-IPPT PAN
Arias A.-other affiliation
9.Rusinek A., Rodriguez-Martinez J.A., Klepaczko J.R., Pęcherski R.B., Analysis of thermo-visco-plastic behaviour of six high strength steels, MATERIALS AND DESIGN, ISSN: 0261-3069, DOI: 10.1016/j.matdes.2008.07.034, Vol.30, No.5, pp.1748-1761, 2009
Abstract:

In this paper the thermo-visco-plastic behaviour of six high strength steels is analyzed in a wide range of strain rates and temperature. The steels belong to two well-known versions of steels: three ferritic steels: HSLA-65, DH-36 and Wedox 460-E and three austenitic steels: Nitronic-50, Uranus B66 and Al-6XN.
Micro-mechanism of plastic deformation in the case of ferritic steels is dominated by dislocation's gliding. In the case of austenitic steels the twinning appears that modifies the material's plastic properties. In the present paper the RK (Rusinek-Klepaczko) constitutive relation is evaluated for modelling of the plastic behaviour of six steels which represent these two different deformation mechanisms.

Keywords:

ferritic steels, austenitic steels, RK Rusinek - Klepaczko model, dislocation glide, twining, thermo-visco-plasticity

Affiliations:
Rusinek A.-other affiliation
Rodriguez-Martinez J.A.-other affiliation
Klepaczko J.R.-IPPT PAN
Pęcherski R.B.-IPPT PAN
10.Rodriguez-Martinez J.A., Rusinek A., Klepaczko J.R., Pęcherski R.B., Extension of R-K constitutive relation to phase transformation phenomena, MATERIALS AND DESIGN, ISSN: 0261-3069, Vol.30, No.7, pp.2513-2520, 2009
Abstract:

In this paper an extension of the Rusinek-Klepaczko (RK) constitutive relation is presented. The new formulation proposed, allows defining the phase transformation effect observed on macroscopic scale using a phenomenological approach. The key point is to introduce in the original formulation of RK model a new stress component based on evolution of martensite, which takes into account strain, strain rate and temperature effects. Analytical predictions of the xtended constitutive relation are compared with experimental results for 301Ln2B steel.

Keywords:

RK model, phase transformation, austenitic steel

Affiliations:
Rodriguez-Martinez J.A.-other affiliation
Rusinek A.-other affiliation
Klepaczko J.R.-IPPT PAN
Pęcherski R.B.-IPPT PAN

Conference papers
1.Stańczak M., Fras T., Blanc L., Pawłowski P., Rusinek A., Numerical Modeling of Honeycomb Structure Subjected to Blast Loading, LS-DYNA2019, 12th European LS-DYNA Conference 2019, 2019-05-14/05-16, Koblenz (DE), pp.1-10, 2019
Abstract:

The main objective of this study is related to the modeling of an aluminum thin-walled honeycomb structure under blast loading. The blast test is performed by means of an explosively driven shock tube (EDST). A planar shock wave is generated by a small amount of an explosive charge detonated in front of the tube. The honeycomb core is compressed by a movement of the steel plate located at the end of the tube. In the experiment, the honeycomb deformation is recorded by a high-speed camera and the absorbed loading by the structure is measured by a force sensor fixed on the rear sample face. The simulation of the material behavior is carried out using the Lagrangian approach implemented in LS-DYNA, ver. R9.0.1. The shock pressure generated by the explosion is recalculated to define the force applied to the plate being in contact (*AUTOMATIC_SURFACE_TO_SURFACE with friction) with the honeycomb and causing its deformation. The honeycomb is meshed by shell elements with a default formulation ELFORM: BELYTSCHKO-TSAY. The front plate is assumed as a rigid body to induce a uniform deformation of the honeycomb structure modeled using *MAT_SIMPLIFIED_JOHNSON_COOK 098 with parameters published in, [1-2]. The simulations are performed for different number of unit cells to define the honeycomb, from a single cell to fifty-three cells, aiming to indicate a minimal cell number required to model properly the entire structure. A dependence of numerical results on the mesh size, unit cell dimensions, friction conditions and the strain rate has been verified. The comparison between values of the load absorbed by the sample crushed numerically and experimentally shows a good agreement providing an insight into mechanisms of blast wave absorption by honeycomb structures. Such an analysis may be further applicable in development of advanced cellular structures applied to dissipate blast energy.

Affiliations:
Stańczak M.-French-German Research Institute of Saint-Louis (FR)
Fras T.-French-German Research Institute of Saint-Louis (FR)
Blanc L.-French-German Research Institute of Saint-Louis (FR)
Pawłowski P.-IPPT PAN
Rusinek A.-other affiliation

Conference abstracts
1.Libura T., Kowalewski Z.L., Matadi Boumbimba R., Rusinek A., Gerard P., Behaviour of glass woven reinforced thermoplastic laminates under uniaxial cyclic loading, DynaMAT, The 13th WORKSHOP on DYNAMIC BEHAVIOR OF MATERIALS AND ITS APPLICATIONS IN INDUSTRIAL PROCESSES, 2019-04-17/04-19, Nicosia (CY), pp.1-2, 2019
2.Pęcherski R.B., Rusinek A., Frąś T., Nowak M., Nowak Z., Energetyczny warunek plastyczności materiałów ortotropowych wykazujących asymetrię zakresu sprężystego, OMIS 2019, XIII Konferencja Naukowa Odkształcalność Metali i Stopów, 2019-11-19/11-22, Łańcut (PL), pp.48-49, 2019
3.Frąś T., Luckner J., Nowak M., Nowak Z., Pęcherski R., Rusinek A., Stręk A., Zastosowanie kryteriów granicznych Burzyńskiego I. Metale i kompozyty metaliczno-ceramiczne II. Pianki metaliczne, PLASMET/2012, VIII Seminarium Naukowe Zintegrowane Studia Podstaw Deformacji Plastycznej Metali, 2012-11-20/11-23, Łańcut (PL), pp.1-4, 2012
4.Frąś T., Pęcherski R., Rusinek A., Experimental investigations of the influence of moderate strains and strain rates on the yield surface of OFHC copper, SolMech 2012, 38th Solid Mechanics Conference, 2012-08-27/08-31, Warszawa (PL), pp.122-123, 2012

Patents
Filing No./Date
Filing Publication
Autor(s)
Title
Protection Area, Applicant Name
Patent Number
Date of Grant
pdf
429504
2019-04-03
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Libura T., Rusinek A., Kowalewski Z.L., Bouslikhane S.
Stanowisko do badań perforacji płyt z materiałów konstrukcyjnych, zwłaszcza płyt cienkich
PL, Instytut Podstawowych Problemów Techniki PAN
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41383
2017-10-31

2017-10-31
Rusinek A., Libura T., Klósak M., Kowalewski Z.L.
Chambre thermique - sarcophage pour essais de perforation a chaud
MA, Instytut Podstawowych Problemów Techniki PAN, Universiapolis (Agadir)
MA 41383 A1
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2019-05-31