A MULTIVARIANT MODEL FOR SINGLE CRYSTAL SHAPE MEMORY ALLOY BEHAVIOR

摘要

A general 3-D multivariant model based on thermodynamics and micromechanics for single crystal shape memory alloy (SMA) behavior is presented. This model is based on the habit plane and transformation directions for the variants of martensite in a given material. From this information, the single crystal behavior of the material to temperature and mechanical loads is derived using the concept of a ther- modynamic driving force. The Eshelby-Kroner approach is utilized to determine the interaction energy between the variants, where it is assumed that variants can be subdivided into several self-accommodating groups in which variants can grow together compatibly.