The thermo - mechanic relations of the shape memory alloy is systemically analyzed , then analyses and experiments on the important characteristic parameters of one kind of sma , such as the recovery strain of free recovery and the recovery stress of restrained recovery and so on are all accomplished . according to the discussion in the dissertation , the sma normal to the axe of the shell , as the number of the sma increases , the deformation of the shell increase 选择了一种合金丝进行了深入研究，集中分析了合金丝的性质，测量该种合金丝的各种性能参数。通过本文的研究可以发现，将合金丝置于垂直于壳的轴线方向，增大合金丝的数量可以达到使曲壳变形增大的目的；同时控制合金丝的工作温度范围，可以控制壳的变形和平滑度。
