The Effect of Loss of Stability of an Arc-Plate Made of Ti-Ni Shape Memory Alloy

Mechanical behavior of an arched Ti-Ni strip with shape memory effect is investigated. It is shown that an arched Ti-Ni strip bent inversely to its initial shape at heating restores its initial shape with a snap (≥WKHVQDS� HIIHFW¥� . This type of behavior is caused by loss of stability at reverse martensitic transformation. It should be noted that tKHFODSLVKHDUGZKHQWKHVWULS∂VHQGVUHVWRQWKHVWDWLRQDU\�K LQJHGJULSV��,IRQHRUERWKHQGVDUHIUHH�� the transition to the austenitic state and the form changing process occur steadily. Shift of one of the edges of an arched strip at phase transformation is a necessary condition for loss of stability with a realization of a snap with a clap. Regular patterns and peculiarities of form changing of an arched strip at different displacement values are found out.