Abstract
When shape memory alloys, such as Ni-Ti, Cu-Al-Zn are loaded, after initial elastic deformation, inelastic deformations sets in due to stress induced martensite transformation. To examine impact characteristics of NiTi, a high speed compression testing system using split Hopkinson pressure bar was developed. Specific examples of interaction between the stress induced and temperature induced martensite and the associated rate effect are presented for NiTi, based on the statistical continuum theory of martensite mechanics. Through these studies, the elastic modulus, the solid viscosity and the effect of temperature on mechanical characteristics of NiTi are clarified.
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