OS09W0076 Thermal effect on crack closure and mechanical behaviors in shape memory alloy fiber reinforced composite

Abstract

In this paper, mechanical property and crack closure behavior of shape memory alloy (SMA) fiber reinforced composite subjected to thermal stress are investigated. For this purpose, three types of polycarbonate matrix composites reinforced by TiNi fiber with different super elasticity and shape memory effect at room temperature are fabricated. Thermal test is performed by changing the applied temperature at the range from -40℃ to 80℃ in thermostatic bath. The behaviors of crack closure and mechanical properties under tensile load are investigated by analyzing the characteristic of photoelastic fringe patterns near the crack tip of the specimens. The effects of prestran and heating temperature on stress intensity are discussed are suitable SMA heating conditions for phase transformation under low temperature are found.