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신명철,지광구,한준현,미서군 대한금속재료학회(대한금속학회) 1996 대한금속·재료학회지 Vol.34 No.1
Temperature response is tested for a Ni-Ti shape memory spring with prestrain or a constant load. An apparatus for measuring variation in deflection of the spring with temperature and DSC are employed to evaluate the characteristics. Localized elastic stress, accumulating on thermo-mechanical cycling, give rise to excess recovery, i.e., continuance of shape change at temperatures well above Af. The accumulation of even apparently elastic stress concentration can initiate dislocation slip, causing a SMA spring to lose its precision. Thus it is strongly advised that SMA thermo-actuator be cycled until no further permanent is induced, before its parameters are evaluated for designing.