Institute of Fundamental Technological Research
Polish Academy of Sciences

Staff

Tomasz Libura, PhD

Department of Experimental Mechanics (ZMD)
Division of Strength of Materials (PWM)
Laboratory for Testing of Materials and Structures
position: Senior Specialist
telephone: (+48) 22 826 12 81 ext.: 347
room: 029
e-mail:
ORCID: 0000-0003-0526-8973

Doctoral thesis
2022-11-09 Study of the impact resistance of laminated composites based on Elium acrylic matrix subjected to prior fatigue aging  (University of Lorraine)
supervisor -- Prof. Alexis Rusinek, University of Lorraine
co-supervisor -- Zbigniew Kowalewski, IPPT PAN
co-supervisor -- Rodrigue Matadi, University of Lorraine
 

Recent publications
1.  Pokorska I., Poński M., Kubissa W., Libura T., Brodecki A., Kowalewski Z.L., Computational Fracture Evolution Analysis of Steel-Fiber-Reinforced Concrete Using Concrete Continuous Damage and Fiber Progressive Models, Materials, ISSN: 1996-1944, DOI: 10.3390/ma16165635, Vol.16, No.5635, pp.1-20, 2023

Abstract:
The process of concrete cracking is a common problem because the first micro-cracks due to the loss of moisture may appear even before the concrete is loaded. The application of fracture mechanics allows for a better understanding of this problem. Steel-fiber-reinforced concrete (SFRC) samples with a notch were subjected to a three-point bending test, and the results for crack energy were used to analyze the concrete’s material properties. In this paper, an experimental and numerical analysis of SFRC with rapid changes in the force (F) crack mouth opening displacement (CMOD) curve (F-CMOD) is presented. In order to obtain the relevant F-CMOD diagrams, three-point bending tests were carried out with non-standard samples with a thickness equal to one-third of the width of standard samples. For analysis purposes, crimped steel fibers were adopted. A probabilistic analysis of the most important parameters describing the material in question, such as peak strength, post-cracking strength, crack mouth opening displacement (CMOD), fracture energy, and the post-cracking deformation modulus, was conducted. The tests and the analysis of their results show that the quasi-static numerical method can be applied to obtain suitable results. However, significant dynamic effects during experiments that influence the F-CMOD curves are hard to reflect well in numerical calculations.

Keywords:
concrete, finite element method (FEM) simulations, steel-fiber-reinforced concrete (SFRC), crack mouth opening displacement (CMOD), steel fibers

Affiliations:
Pokorska I. - IPPT PAN
Poński M. - IPPT PAN
Kubissa W. - Warsaw University of Technology (PL)
Libura T. - IPPT PAN
Brodecki A. - IPPT PAN
Kowalewski Z.L. - IPPT PAN
2.  Serjouei A., Libura T., Brodecki A., Radziejewska J., Broniszewska P., Pawłowski P., Szymczak T., Bodaghi M., Kowalewski Z.L., Strength-hardness relationship for AlSi10Mg alloy produced by laser powder bed fusion: An experimental study, MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2022.144345, Vol.861, No.144345, pp.1-13, 2022

Abstract:
In this work, significant strength and ductility variations are reported for AlSi10Mg parts fabricated at different orientations using laser powder bed fusion (LPBF). Hardness and surface roughness of the specimens at different orientations were measured. Tensile testing together with digital image correlation technique were conducted on the specimens. XY specimens showed the highest yield stress and ultimate tensile strength while XZ specimens showed the highest ductility. Hardness measurements for different specimens were in accordance with the tensile test results, following the same order as the UTS values, XY specimens being the highest and XY-45° (out-of-plane) specimens being the lowest. Fractography of the broken surfaces of the specimens under tensile testing revealed the microstructural features and various defects in the tensile fracture. The anisotropy in mechanical properties is attributed to the microstructural anisotropy as well as presence of various types of defects induced by the AM process, which affects the deformation and failure mechanism of the parts. Linear relationships between experimental Vickers hardness versus yield stress and UTS measurements were developed. In case of material selection for different applications, these relationships can be used as a simple tool for converting hardness and yield stress (or UTS) values to each other. An equivalent strain-hardness relationship was also proposed which can be used for health monitoring of parts subject to tensile loading.

Keywords:
Laser powder bed fusion, Hardness, Mechanical properties, Defects, Microstructure

Affiliations:
Serjouei A. - University of Derby (GB)
Libura T. - IPPT PAN
Brodecki A. - IPPT PAN
Radziejewska J. - IPPT PAN
Broniszewska P. - IPPT PAN
Pawłowski P. - IPPT PAN
Szymczak T. - Motor Transport Institute (PL)
Bodaghi M. - other affiliation
Kowalewski Z.L. - IPPT PAN
3.  Libura T., Boumbimba R.M., Rusinek A., Kowalewski Z.L., Szymczak T., Gerard P., Effect of uniaxial fatigue aging and fabric orientation on low impact velocity response of glass fibers/elium acrylic composite laminates, Materials, ISSN: 1996-1944, DOI: 10.3390/ma14154089, Vol.14, No.15, pp.4089-1-23, 2021

Abstract:
Impact resistance is one of the most critical features of composite structures, and therefore, its examination for a new material has a fundamental importance. This paper is devoted to the characterization of the fully recyclable thermoplastic ELIUM acrylic resin reinforced by glass fabric woven, which belongs to a new category of materials requiring advanced testing before their application in responsible elements of engineering structures. Its high strength, low weight as well as low production cost give excellent opportunities for its wide application in the automotive industry as a replacement of the thermoset-based laminates. The study presents an experimental work concerning the effect of damage due to low and high cyclic fatigue aging of two groups of specimens, first with the woven fabric orientations of [0°/90°]4 and secondly with [45°/45°]4, on the low impact velocity properties. The impact resistance was measured in terms of load peak, absorbed energy, penetration threshold and damage analysis. The low velocity impact results indicate that the uniaxial cyclic loading (fatigue aging) of the material leads to the reduction of impact resistance, especially at the high impact energy levels. Scanning Electron Microscopy (SEM) and Computed Tomography (CT) scan observations reveal that the damage area grows with the increase of both strain amplitude and impact energy.

Keywords:
elium acrylic, glass fibers, composite laminates, fatigue aging, low impact velocity, damage

Affiliations:
Libura T. - IPPT PAN
Boumbimba R.M. - Université de Lorraine (FR)
Rusinek A. - other affiliation
Kowalewski Z.L. - IPPT PAN
Szymczak T. - Motor Transport Institute (PL)
Gerard P. - ARKEMA, Groupement de Recherche de Lacq (FR)
4.  Frydrych K., Libura T., Kowalewski Z., Maj M., Kowalczyk-Gajewska K., On the role of slip, twinning and detwinning in magnesium alloy AZ31B sheet, MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, ISSN: 0921-5093, DOI: 10.1016/j.msea.2021.141152, Vol.813, pp.141151-1-14, 2021

Abstract:
The paper reports experimental and numerical study of different deformation mechanisms activated in the AZ31B mag nesium alloy sheet subjected to cyclic in-plane tensile – compressive deformation. The influence ofslip, twinning and detwinning upon the mechanical response and texture evolution of the material is thoroughly investigated. The regime of twinning and detwinning activity is assessed based on the variation of hardening modulus in the course of the process. Velocity-based large strain crystal plasticity model accounting for twinning and detwinning is formulated. The crystal plasticity model parameters are identified using the implementation of the evolutionary algorithm. Predicted activity of deformation mechanisms is discussed with respect to the experimental data.

Keywords:
twinning, detwinning, crystal plasticity, magnesium alloys, AZ31B, evolutionary algorithm

Affiliations:
Frydrych K. - IPPT PAN
Libura T. - IPPT PAN
Kowalewski Z. - IPPT PAN
Maj M. - IPPT PAN
Kowalczyk-Gajewska K. - IPPT PAN
5.  Wood P., Libura T., Kowalewski Z.L., Williams G., Serjouei A., Influences of horizontal and vertical build orientations and post-fabrication processes on the fatigue behavior of stainless steel 316L produced by selective laser melting, Materials, ISSN: 1996-1944, DOI: 10.3390/ma12244203, Vol.12, No.24, pp.4203-1-19, 2019

Abstract:
In this paper, the influences of build orientation and post-fabrication processes, including stress-relief, machining, and shot-peening, on the fatigue behavior of stainless steel (SS) 316L manufactured using selective laser melting (SLM) are studied. It was found that horizontally-built (XY) and machined (M) test pieces, which had not been previously studied in the literature, in both stress-relieved (SR) or non-stress-relieved (NSR) conditions show superior fatigue behavior compared to vertically-built (ZX) and conventionally-manufactured SS 316L. The XY, M, and SR (XY-M-SR) test pieces displayed fatigue behavior similar to the XY-M-NSR test pieces, implying that SR does not have a considerable effect on the fatigue behavior of XY and M test pieces. ZX-M-SR test pieces, due to their considerably lower ductility, exhibited significantly larger scatter and a lower fatigue strength compared to ZX-M-NSR samples. Shot-peening (SP) displayed a positive effect on improving the fatigue behavior of the ZX-NSR test pieces due to a compressive stress of 58 MPa induced on the surface of the test pieces. Fractography of the tensile and fatigue test pieces revealed a deeper understanding of the relationships between the process parameters, microstructure, and mechanical properties for SS 316L produced by laser systems. For example, fish-eye fracture pattern or spherical stair features were not previously observed or explained for cyclically-loaded SLM-printed parts in the literature. This study provides comprehensive insight into the anisotropy of the static and fatigue properties of SLM-printed parts, as well as the pre- and post-fabrication parameters that can be employed to improve the fatigue behavior of steel alloys manufactured using laser systems.

Keywords:
selective laser melting, stainless steel 316L, fatigue, defect, fracture

Affiliations:
Wood P. - University of Derby (GB)
Libura T. - IPPT PAN
Kowalewski Z.L. - IPPT PAN
Williams G. - University of Derby (GB)
Serjouei A. - University of Derby (GB)

Conference papers
1.  Libura T., Matadi Boumbimba R., Rusinek A., Szymczak T., Kowalewski Z.L., Gerard P., Effect of uniaxial fatigue aging and fabric orientation on low velocity impact of composite laminates, DAS37, 37th Danubia Adria Symposium on Advances in Experimental Mechanics, 2021-09-21/09-24, Linz (AT), pp.81-82, 2021
2.  Libura T., Kowalewski Z.L., Szymczak T., Wpływ cyklicznego obciążenia na odporność na uderzenia laminatu z żywicy termoplastycznej wzmocnionej tkaniną z włókna szklanego, XIII NKRM 2019, XIII Konferencja Nowe Kierunki Rozwoju Mechaniki, 2019-03-20/03-23, Będlewo (PL), pp.41-42, 2019

Keywords:
kompozyty, żywice termoplastyczne, badania zmęczeniowe, udarność

Affiliations:
Libura T. - IPPT PAN
Kowalewski Z.L. - IPPT PAN
Szymczak T. - Motor Transport Institute (PL)
3.  Libura T., Kowalewski Z.L., Dietrich L., Socha G., Anti-buckling system for flat specimens investigations under cyclic tension-compression, Materials Today: Proceedings, ISSN: 2214-7853, DOI: 10.1016/j.matpr.2016.03.045, No.3, pp.1045-1050, 2016

Abstract:
Modern automobile and airplane structures made of sheet metals or composites require usage of thinner and stronger materials. On the other hand, manufacturers are trying to reduce production costs by shortening the fabrication processes and by application of computed simulation for forming operation. Therefore, it is necessary to better understand and more accurately investigate deformation behaviour of sheet alloys. Testing of flat specimens under compression and cyclic tension-compression within large deformation procures a lot of problems. One of them is the buckling phenomenon. A new version of the device mounted in a standard testing machine was developed and geometry of the specimen for validation of the device was proposed. Specimens of DP690 steel with nominal thickness equal to 1.6 mm were investigated at ambient temperature. Tension-compression cyclic tests within a strain range ± 0.04 were executed starting in tension direction. It is shown that the results are repeatable.

Keywords:
Buckling, cyclic loading, fixture, thin sheets

Affiliations:
Libura T. - IPPT PAN
Kowalewski Z.L. - IPPT PAN
Dietrich L. - IPPT PAN
Socha G. - other affiliation

Conference abstracts
1.  Libura T., Rusinek A., Boumbimba R.M., Kowalewski Z.L., Brodecki A., Gerard P., EFFECT OF FATIGUE AGING ON THE HIGH VELOCITY IMPACT RESISTANCE OF GLASS WOVEN REINFORCED ELIUM ACRYLIC LAMINATES, ICDM4, The Fourth International Conference on Damage Mechanics, 2023-05-15/05-18, Baton Rouge, Louisiana (US), pp.1-1, 2023

Keywords:
composite, laminate, fatigue damage, impact damage, perforation, delamination

Affiliations:
Libura T. - IPPT PAN
Rusinek A. - IPPT PAN
Boumbimba R.M. - Université de Lorraine (FR)
Kowalewski Z.L. - IPPT PAN
Brodecki A. - IPPT PAN
Gerard P. - ARKEMA, Groupement de Recherche de Lacq (FR)
2.  Pokorska I., Poński M., Kubissa W., Libura T., Brodecki A., Kowalewski Z., ANALYSIS OF CRACKING EVOLUTION AND FRACTURE ENERGY CHANGE OF STEEL FIBER-REINFORCED CONCRETE, CMM-SolMech 2022, 24th International Conference on Computer Methods in Mechanics; 42nd Solid Mechanics Conference, 2022-09-05/09-08, Świnoujście (PL), No.237, pp.1-1, 2022
3.  Libura T., Rusinek A., Matadi Boumbimba R., Kowalewski Z.L., Gerard P., INFLUENCE OF FATIGUE AGING AND FIBER ORIENTATION ON THE HIGH VELOCITY IMPACT RESISTANCE OF GLASS WOVEN REINFORCED ELIUM ACRYLIC LAMINATES, ICEM, 19th International Conference on Experimental Mechanics, 2022-07-17/07-21, Kraków (PL), pp.185-186, 2022
4.  Pokorska I., Poński M., Kubissa W., Libura T., Brodecki A., Kowalewski Z.L., PROBABILISTIC STUDY ON CRACKING EVOLUTION AND FRACTURE ENERGY CHANGE OF STEEL FIBER-REINFORCED CONCRETE, ICEM, 19th International Conference on Experimental Mechanics, 2022-07-17/07-21, Kraków (PL), pp.363-364, 2022
5.  Wood P., Gunputh U., Williams G., Carter W., Boud F., Bahi S., Rusinek A., Kowalewski Z.L., Nowak Z., Libura T., Vojiadjis G.Z., Diaz-Alvare J., Miguelez M.H., SELECTIVE LASER MELTING OF A HIGH PRECISION TURBOMACHINERY APPLICATION IN IN718 ALLOY, ICEM, 19th International Conference on Experimental Mechanics, 2022-07-17/07-21, Kraków (PL), pp.34-35, 2022
6.  Libura T., Kowalewski Z.L., Matadi Boumbimba R., Rusinek A., An influence of fatigue and fabric orientation on dynamic properties of the Elium acrylic resin reinforced by glass fibers, 9th Wdzydzenaum Workshop on FLUID – SOLID INTERACTION, 2021-09-05/09-10, Wdzydze Kiszewskie (PL), pp.41, 2021
7.  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
8.  Kowalewski Z.L., Libura T., Experimental characterization of magnesium alloy thin sheets using anti-buckling fixture, LMM 2019, International Conference on Lightweight Materials and Manufacture, 2019-10-09/10-12, Changsha (CN), pp.1-1, 2019
9.  Kowalewski Z.L., Nowak Z., Pęcherski R.B., Libura T., Identification of effects associated to dynamic testing using shpb or dict- experiment and numerical analysis, 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
10.  Libura T., Brodecki A., Kowalewski Z.L., Behaviour of glass woven reinforced thermoplastic laminates under uniaxial cyclic loading, PCM-CMM, 4th Polish Congress of Mechanics, 23rd International Conference on Computer Methods in Mechanics, 2019-09-08/09-12, Kraków (PL), pp.1-1, 2019

Keywords:
cyclic loading, damage evolution, laminate composites

Affiliations:
Libura T. - IPPT PAN
Brodecki A. - IPPT PAN
Kowalewski Z.L. - IPPT PAN
11.  Kowalewski Z.L., Szczęsny G., Libura T., Brodecki A., Destabilization of the comminuted clavicle shaft fracture due to breakage of the titanium locking plate - mechanical analysis, DAS 2019, 36th DANUBIA-ADRIA Symposium on Advances in Experimental Mechanics, 2019-09-24/09-27, Pilzno (CZ), pp.1-2, 2019
12.  Taras W., Pyrzanowski P., Gadomski J., Kowalewski Z.L., Libura T., An influence of fiber orientation and load direction on behaviour of thin composite samples, SME, XXVIII Symposium On Experimental Mechanics of Solids in memory of prof. Jacek Stupnicki, 2018-10-17/10-20, Jachranka (PL), pp.1, 2018
13.  Libura T., Nowak Z., Kowalewski Z.L., Widłaszewski J., Behaviour of inconel 718 aerospace alloy thin sheets under in-plane tension-compression, SME, XXVIII Symposium On Experimental Mechanics of Solids in memory of prof. Jacek Stupnicki, 2018-10-17/10-20, Jachranka (PL), pp.42-42, 2018
14.  Libura T., Kowalewski Z.L., Kowalczyk-Gajewska K., The Bauschinger Effect in thin sheet magnesium alloy using anti-buckling fixture, DAS 2017, 34th Danubia-Adria Symposium on Advances in Experimental Mechanics, 2017-09-19/09-22, Trieste (IT), pp.1-2, 2017
15.  Libura T., Kowalewski Z.L., Kowalczyk-Gajewska K., Dietrich L., Strain-hardening effect in thin-sheet magnesium alloy AZ31B under low cyclic loading, XII Konferencja „Nowe Kierunki Rozwoju Mechaniki”, 2017-03-22/03-25, Białystok - Supraśl (PL), pp.1-2, 2017

Abstract:
Optimization of sheet metal forming processes requires a very good knowledge of material forming ability. During the forming of industrial parts, very complex strain paths are usually observed and can affect the formability of the sheet. Therefore, it is necessary to better understand and more accurately investigate deformation behaviour of sheet alloys. It should be noted that material testing of flat specimens under compression within a large deformation range procures many difficulties, and the buckling phenomenon seems to be the most im-portant. This paper shows the results of tension-compression tests carried out on specimens made of ultralight magnesium alloys AZ31B with nominal thickness equal to 1 mm using the anti-buckling fixture to avoid buckling problem.

Keywords:
Bauschinger effect, cyclic loading, buckling, fixture, thin sheet

Affiliations:
Libura T. - IPPT PAN
Kowalewski Z.L. - IPPT PAN
Kowalczyk-Gajewska K. - IPPT PAN
Dietrich L. - IPPT PAN
16.  Libura T., Kowalewski Z.L., Kowalczyk-Gajewska K., Dietrich L., Low cycle fatigue of a rolled magnesium alloy using anti-buckling fixture, DYMAT, 10th Workshop, 2016-08-24/08-26, Poznań (PL), pp.59-61, 2016
17.  Kowalewski Z.L., Socha G., Dietrich L., Libura T., Thin sheet of brass testing under cyclic tension - compression using novel anti-buckling fixture, DAS 2015, 32nd Danubia-Adria-Symposium on Advances in Experimental Mechanics, 2015-09-22/09-25, Smokovec (SK), Vol.1, pp.128-129, 2015
18.  Libura T., Moćko W., Kowalewski Z.L., A new version of Hopkinson bar testing stand for determination of dynamic tensile characteristics, SolMech 2014, 39th Solid Mechanics Conference, 2014-09-01/09-05, Zakopane (PL), pp.311-312, 2014

Patents
Filing No./Date
Filing Publication
Autors
Title
Protection Area, Applicant Name
Patent Number
Date of Grant
pdf
429504
2019-04-03
BUP 21/2020
2020-10-05
Libura T., Rusinek A., Kowalewski Z.L., Bouslikhane S.
Stand for testing the perforation of plates made of construction materials, in particular thin plates
PL, Instytut Podstawowych Problemów Techniki PAN
239439
WUP 35/2021
2021-11-29



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

2019-05-31



420748
2017-03-06
BUP 19/2018
2018-09-10
Libura T., Kowalewski Z.L., Moćko W.
Device for dynamic tensile testing of structural materials within the range of high deformation speed values
PL, Instytut Podstawowych Problemów Techniki PAN
234759
WUP 03/2020
2020-03-31



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