Aufsatz
Thermomechanical analysis of strain recovery in shape memory alloys under variable non-isothermal conditions
Zusammenfassung
The present work focuses on size dependencies in thermo-mechanical testing of shape memory alloys and a phenomenon occurring for direction-dependent activation. Emphasis is on strain recovery which is enabled by a martensiteto-austenite transformation, modeled using a phenomenological evolution equation. In transient numerical studies performed with the finite element method for a non-isothermal tension testing case, the influence of the Fourier and Stefan number is investigated. The results indicate that, in experiments, the Fourier number should ideally be much greater than ten to prevent falsification by the current Stefan number. An additional study is carried out for the activation of a beam in its thickness direction. It shows that the gradient in transformation causes bending, which can only be considered in simulations by adequate spatial resolution.
Zitierform
In: Proceedings in Applied Mathematics & Mechanics Volume 24 / Issue 2 (2024-09-05) eissn:1617-7061Förderhinweis
Gefördert im Rahmen des Projekts DEALZitieren
@article{doi:10.17170/kobra-2024100410917,
author={Descher, Stefan and Krooß, Philipp and Ewald, Felix and Kuhl, Detlef},
title={Thermomechanical analysis of strain recovery in shape memory alloys under variable non-isothermal conditions},
journal={Proceedings in Applied Mathematics & Mechanics},
year={2024}
}
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2024-10-04T11:27:58Z 2024-10-04T11:27:58Z 2024-09-05 doi:10.17170/kobra-2024100410917 http://hdl.handle.net/123456789/16075 Gefördert im Rahmen des Projekts DEAL eng Namensnennung 4.0 International http://creativecommons.org/licenses/by/4.0/ 600 Thermomechanical analysis of strain recovery in shape memory alloys under variable non-isothermal conditions Aufsatz The present work focuses on size dependencies in thermo-mechanical testing of shape memory alloys and a phenomenon occurring for direction-dependent activation. Emphasis is on strain recovery which is enabled by a martensiteto-austenite transformation, modeled using a phenomenological evolution equation. In transient numerical studies performed with the finite element method for a non-isothermal tension testing case, the influence of the Fourier and Stefan number is investigated. The results indicate that, in experiments, the Fourier number should ideally be much greater than ten to prevent falsification by the current Stefan number. An additional study is carried out for the activation of a beam in its thickness direction. It shows that the gradient in transformation causes bending, which can only be considered in simulations by adequate spatial resolution. open access Descher, Stefan Krooß, Philipp Ewald, Felix Kuhl, Detlef doi:10.1002/pamm.202400203 Thermomechanik Dehnung Memory-Legierung publishedVersion eissn:1617-7061 Issue 2 Proceedings in Applied Mathematics & Mechanics Volume 24 false e-202400203
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