A new method of coil spring design applicable to Ni-Ti-Cu shape memory alloy was studied. Design values agreed well with measurements within the range of 2 K of operating temperature, thus justifying the design. The present design method is based on the characteristics of shear stress, shear strain, and phase transformation temperature as its principal data, and therefore is accurate and superior in that the design can accommodate material deterioration and that the operation temperature can be determined.

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