ACCOUNTING STRAIN INCOMPATIBILITY IN THE NANOSTRUCTURAL MODEL OF SHAPE MEMORY ALLOY MECHANICAL BEHAVIOR

摘要

Within the framework of the previously developed nanostructural model of deformation of polycrystalline shape memory alloys (SMAs), a refined expression for the thermodynamic potential is introduced by adding terms that take into account the incompatibility caused by phase-structural deformation of martensite. The terms of two types were used to take into account the strain incompatibility both between martensite formations and the austenite matrix and between differently oriented martensite formations within the martensite phase. It is shown that taking into account the strain incompatibility affects the temperature intervals of phase transitions. Based on the experimental data, the material functions included in the above-mentioned additional terms are determined.