Development of autonomous experimental setup to investigate directional distortional hardening under biaxial loading

0551682 - ÚT 2022 RIV CZ eng C - Konferenční příspěvek (zahraniční konf.)
Svárovský, Jiří - Parma, Slavomír - Štefan, Jan - Ciocanel, C. - Feigenbaum, H. P. - Klepač, Vilém - Marek, René - Plešek, Jiří
Development of autonomous experimental setup to investigate directional distortional hardening under biaxial loading.
Computational mechanics 2021. Proceedings of computational mechanics 2021. Plzeň: University of West Bohemia, 2021 - (Adámek, V.; Jonášová, A.; Plánička, S.; Zajíček, M.), s. 245-247. ISBN 978-80-261-1059-0.
[Computational Mechanics 2021 /36./. Srní (CZ), 08.11.2021-10.11.2021]
Grant CEP: GA MŠMT(CZ) EF15_003/0000493; GA MŠMT(CZ) LTAUSA18199; GA ČR(CZ) GA19-03282S
Institucionální podpora: RVO:61388998
Klíčová slova: directional distortional hardening * yield surface * strain hardening * Labview
Obor OECD: Materials engineering
https://www.kme.zcu.cz/compmech/info_sborniky.php

Plastic deformations alter the shape of the yield surface in the stress space. Models for predicting the shape of the yield surface according to the direction of loading are being developed. Experimental data are the key factor in development and validation of phenomenological models, such as the model of directional distortional hardening cited in this study. The objective of this paper is to present the experimental setup for investigation of the directional distortional hardening. A new autonomous method was developed using an axial-torsional testing machine and the Labivew 2017 graphical programming environment to monitor the yield surface in axial stress – shear stress space. A suitable yield condition in form of effective plastic strain was used for the determination of the yield points. Initial yield surface obtained by this method shows promising agreement with von Mises model of the yield surface. Several outstanding yield points were measured which disrupt the assumption of the yield surface convexity. Therefore, possible shortcomings caused by the methodology are being investigated.
Trvalý link: http://hdl.handle.net/11104/0327203