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Stress-Strain Response Determination during Incremental Step Tests and Variable Loadings on Flat Specimens

Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, 1000 Ljubljana, Slovenia
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Technologies 2019, 7(3), 53; https://doi.org/10.3390/technologies7030053
Received: 27 June 2019 / Revised: 24 July 2019 / Accepted: 1 August 2019 / Published: 4 August 2019
(This article belongs to the Special Issue Processing and Fabrication of Advanced Materials)
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Abstract

For stress-strain response simulations and damage prediction of cyclically loaded mechanical components, it is crucial to determine both the stress-strain and durability curves of the materials sued. Round and flat specimens can be used for this purpose, either following standard recommendations for their geometry or by designing a special geometry which enables special requirements, such as initial cracks of various shapes, attachment of an extensometer, special grips for raised temperatures, and so on. However, especially in the case of flat specimens having a slender shape, buckling can occur before the stress or strain values reach a sufficient magnitude in compression. To avoid this, an anti-buckling support can be attached to the specimen, which prevents the occurrence of buckling. In turn, friction occurs between the specimen and the anti-buckling support, which affects the measurement of the stress. If a special sensor is attached under the anti-buckling support, the friction force can be measured and subtracted from the stress signal, leaving only the stress-strain response of the material under investigation. In this study, two materials were investigated during incremental step and variable loading tests: The aluminium alloy AlMgSi0.5 and a biodegradable polylactide. View Full-Text
Keywords: cyclic stress-strain response; aluminium alloy AlMgSi0.5; Biodegradable polylactide; anti-buckling support; friction cyclic stress-strain response; aluminium alloy AlMgSi0.5; Biodegradable polylactide; anti-buckling support; friction
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Šeruga, D.; Nagode, M.; Klemenc, J. Stress-Strain Response Determination during Incremental Step Tests and Variable Loadings on Flat Specimens. Technologies 2019, 7, 53.

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