Thermomechanical Modeling of Stress Relaxation in Shape Memory Alloy Wires View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2015-04

AUTHORS

Fateme Zare, Mahmoud Kadkhodaei, Iman Salafian

ABSTRACT

When a shape memory alloy (SMA) is subjected to a mechanical load, especially at high strain rates, its temperature varies due to thermomechanical coupling in the response of these materials. Thus, if strain is kept constant during the transformation, temperature change will cause stress to decrease during loading and to increase during unloading. A decrease in stress under constant strain indicates stress relaxation, and an increase in stress indicates stress recovery, i.e., reverse stress relaxation. In this paper, a fully coupled thermomechanical model is developed in a continuum framework to study stress relaxation and stress recovery in SMA wires. Numerical simulations at different ambient temperatures, applied strain rates, wire radii, and relaxation intervals are done to show the abilities of the proposed model in predicting relaxation phenomena in various conditions where strain remains constant during loading or unloading. Relaxation experiments were also performed on NiTi wires, and the numerical and empirical results are shown to be in a good agreement. More... »

PAGES

1763-1770

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s11665-015-1440-2

DOI

http://dx.doi.org/10.1007/s11665-015-1440-2

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1049523591


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