Paper number 377

THREE-DIMENSIONAL DESIGN ANALYSIS FOR HYSTERETIC BEHAVIOR OF TINI-SMA FIBER EMBEDDED SMART COMPOSITES

M. Kawai

Institute of Engineering Mechanics
University of Tsukuba, Tsukuba 305-8573, JAPAN

Summary

Mechanical behavior of a unidirectional TiNi shape-memory alloy (SMA) fiber embedded composite is analyzed using a three-dimensional micromechanical method of cells and a SMA model for rhombohedral and martensitic transformations. The overall behavior of the TiNi-SMA composite is governed by the pseudoelastic response of the embedded TiNi-SMA fibers, and a pseudoelasticity-like hysteretic behavior appears in the stress-strain relationships under isothermal loading and unloading conditions. The shape and size of the hysteresis are significantly influenced by the volume fraction of TiNi-SMA fibers. For a high volume fraction of fibers, in particular, the rhombohedral transformation of the embedded TiNi-SMA characterizes the overall hysteretic behavior of the TiNi-SMA composite.

Keywords

shape memory alloy composite, smart composite, TiNi-SMA fiber, method of cells, multiaxial constitutive model, pseudoelasticity, martensitic transformation, rhombohedral transformation.