Strain hardening reduces energy absorption efficiency of austenitic stainless steel foams while porosity does not

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dc.contributor.authorKaya, Ali Can
dc.contributor.authorZaslansky, Paul
dc.contributor.authorİpekoğlu, Mehmet
dc.contributor.authorFleck, Claudia
dc.date.accessioned2021-01-08T21:51:24Z
dc.date.available2021-01-08T21:51:24Z
dc.date.issued2018
dc.departmentTAÜ, Mühendislik Fakültesi, Mekatronik Mühendisliği Bölümü
dc.departmentTAÜ, Mühendislik Fakültesi, Makine Mühendisliği Bölümüen_US
dc.descriptionIpekoglu, Mehmet/0000-0002-0019-3346; Fleck, Claudia/0000-0002-8160-2710; zaslansky, paul/0000-0002-8714-4992; Kaya, Ali Can/0000-0003-2856-5508en_US
dc.descriptionWOS:000425879300032en_US
dc.description.abstractStrain hardening significantly affects the mechanical function of steel foams. We compare hardening and failure of two commercially available austenitic stainless steel foams (316L and 310) spanning strut porosities of 9.4 to 144%. Damage is correlated with strut microstructure and geometry, combining in-situ quasi-static compression testing in the SEM, 3D-evaluation by synchrotron mu CT and bending simulations. We provide an analytical model for the experimentally observed strain hardening. Upon compression, 316L steel foams exhibit a plateau regime of continuously increasing stress due to the hardening effect, whereas 310 steel foams show almost constant plateau stress This is explained by the much less ductile behaviour of the 310 steel foam struts as compared to 316L steel foam struts. Finite element modelling suggests that significant stress concentrations develop around micro porosities in the 310 struts. Due to its finer and less porous microstructure, the 316L foam exhibits a larger energy absorption capacity than the 310 foams. This results in distinctly different efficiency-strain curves. However, up to about 25% strain, the efficiency values are surprisingly similar. Thus, modification of microstructure and/or pore micro-geometry can be used to optimise the stress-strain response to achieve the desired energy absorption property of steel foams. (C) 2018 Elsevier Ltd. All rights reserved.
dc.description.sponsorshipTurkish Ministry of EducationTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [1416]
dc.description.sponsorshipThe authors acknowledge Martina Schaube, Martin Richter and Nils Putscher for their great support in metallographic preparation of the specimens, Sun Zhe for sample preparation, and Christoph Fahrenson at ZELMI, TU Berlin for the SEM investigations and EDX analyses. Ali Can Kaya thanks the Turkish Ministry of Education for the doctoral grant [Grant Nr. 1416]. We further thank the Julius Wolff Institute, Charite - Universitatsmedizin Berlin, for use of the DANTEC Istra DIC system. We are thankful for the excellent support of Ralf Britzke and for beamtime access to the BAMline imaging beamline of the Helmholtz Zentrum Berlin (HZB). Additional data used for some of the FE simulations was obtained through the generous support of Dr. Alexander Rack on ID19 of the European Synchrotron Radiation Facility (ESRF), for which beamtime is gratefully acknowledged.
dc.identifier.doi10.1016/j.matdes.2018.02.009
dc.identifier.endpage308en_US
dc.identifier.issn0264-1275
dc.identifier.issn1873-4197
dc.identifier.scopus2-s2.0-85041743601
dc.identifier.scopusqualityQ1
dc.identifier.startpage297en_US
dc.identifier.urihttp://doi.org/10.1016/j.matdes.2018.02.009
dc.identifier.urihttps://hdl.handle.net/20.500.12846/224
dc.identifier.volume143en_US
dc.identifier.wosWOS:000425879300032
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherElsevier Sci Ltd
dc.relation.ispartofMaterials & Design
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectStainless Steel Metal Foamen_US
dc.subjectStrain Hardeningen_US
dc.subjectPorosityen_US
dc.subjectStrut Fractureen_US
dc.titleStrain hardening reduces energy absorption efficiency of austenitic stainless steel foams while porosity does not
dc.typeArticle

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