AN ACCURATE PREDICTION OF SPECIFIC DAMPING CAPACITY OF TINI SMA COMPOSITE THROUGH A 3-DIMENSIONAL CONSTITUTIVE MODEL

Analytical predictions of the constitutive relations and the damping c apacity of TiNi shape memory alloy (SMA) fiber reinforced composite la mina have been presented in this work. The stress induced martensitic (M-phase) and rhombohedral (R-phase) phase transformations of the TiNi SMA fiber are taken into account in the formulation of a multiaxial c onstitutive model of SMA material. The constitutive relation and the d amping capacity corresponding to all the six directions (normal and sh ear) of the lamina level SMA composite have been derived based on a si mple square fiber packing. The predictive capability of the present me thod is demonstrated by simulating the stress-strain curves under isot hermal loading and unloading conditions. The specific damping capacity defined as the ratio of the hysteresis type energy dissipation to the stored strain energy is also numerically computed and furnished.