Abstract
In this work, a two-way displacing Cu-Al-Ni/Polyimide shape memory alloy bi-morph without any post processing has been developed. The forward stroke was achieved with shape memory effect and the return stroke was due to the influence of flexible polyimide substrate. A custom made setup with electrical heating was developed to investigate the life cycle of the bi-morph at different voltages, ranging from 2V to 3V. The austenite transformation temperatures of the bi-morph, was found to be As=215°C and Af=240°C. Shape recovery ratio was calculated and the shape memory alloy deposited on 75μm thick polyimide sheet exhibited better recoverability than 50μm thick sheets. Further, maximum displacement of 19mm was observed from the edge of the bi-morph through plate heating. The effect of substrate thickness on the life cycle behavior of the bi-morph was investigated. The bi-morph showed minor signs of deformation when actuated at 0.5Hz after 500 cycles. In addition the structural, morphological and thermal behavior of the SMA bi-morph has been investigated in detail.
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