Stress-induced martensitic transformation of a NiTi alloy in isothermal shear, tension and compression

✍ Scribed by L. Orgéas; D. Favier

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 647 KB
• Volume: 46
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/s1359-6454(98)00167-0

✦ Synopsis

AbstractÐThe thermomechanical behaviour of stress-induced martensitic transformation in an equiatomic NiTi alloy was investigated with respect to dierent deformation modes including uniaxial tension, compression and shear of plate specimens at dierent temperatures above the M s temperature. Results showed that loading conditions have signi®cant in¯uences on the deformation behaviour of the alloy. In particular, deformation behaviour was observed to be asymmetric in tension and in compression. The physical origins of such an asymmetry are explored. Comparison among the results obtained from the tension, compression and shear tests disproves the use of classical Von Mises equivalent in the modelling of the three-dimensional behaviour of martensitic transformation in this alloy. Based on this analysis, another criterion for yielding, which involves the third stress invariant, is therefore suggested.