발간논문

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Vol.34, No.1, 47 ~ 50, 1996
Title
Stress Localization and Excess Recovery in a Shape Memory Alloy
지광구K . K . Jee, 한준현J . H . Han, 미서군X . K . Mi, 신명철M . C . Shin
Abstract
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.
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