Abstract
The influence of training and shape memory processing temperature on cyclic deformation of TiNi shape memory alloy helical springs was investigated. In the experiment, an offset crank shape memory alloy heat engine was used. The results are summarized as follows. For large strain, significant nonrecoverable elongation in the early cycles appears. The appearance of the nonrecoverable elongation can be avoided by training. The recovery force of the spring varies slightly, which shows the very stable cyclic characteristics of the force. The cyclic characteristics of deformation in the helical spring depend on the size of the region accompanied by stress-induced martensitic transformation in the cross section of the wire. In the case of low shape memory processing temperature, the nonrecoverable elongation is small, the axial force at high temperature is high and the number of cycles to failure is small.
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