MICROMECHANICS OF ACTIVE METAL MATRIX COMPOSITES WITH SHAPE MEMORY ALLOY FIBERS
Conference Paper
Overview
Identity
Additional Document Info
Other
View All
Overview
abstract
The effective thermomechanical response of Active Metal Matrix Composites (AMMC) with Shape Memory Alloy (SMA) fibers is modeled in the present work. A modification to Tanaka's exponential model (Tanaka, 1986) of the thermomechanical response of SMA is introduced to account for stress induced transformation strains under tension as well as compression. The model is also generalized to the three dimensional case in a consistent way with the thermodynamics approach of Boyd and Lagoudas (1994). A detailed procedure for the incremental implementation of the SMA constitutive equations is described. The SMA constitutive model is then employed in a computational finite element analysis scheme for tetragonal and hexagonal periodic arrangements of SMA fibers to obtain the effective response of elastoplastic matrix / active fiber composites. The overall thermomechanical response and shape memory behavior of AMMC is analyzed, and in particular the effect of recoverable transformation strains in the SMA fibers on the yield strength of these composites. 1994, Elsevier B.V.