Metal treatment – Stock – Mechanical memory
Patent
1993-12-10
1995-05-30
Roy, Upendra
Metal treatment
Stock
Mechanical memory
148421, 148563, 420902, C21D 800, C22F 100
Patent
active
054197880
ABSTRACT:
The present invention relates to a method for increasing the useful life of a shape memory alloy (SMA) actuator, wherein the SMA element contracts on heating and elongates on cooling under an applied stress and that property is used as an actuating technique. More specifically, the present invention relates to the cooling aspect of the cycle and maintaining a martensite strain on the actuator SMA element at less than about 3% by limiting the upper stress on the element. In the most preferred embodiment, the element is a ribbon actuator prepared from a nickel-titanium SMA alloy.
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Kao Ming-Yuan
Schmitz Dwight M.
Thoma Paul E.
Johnson Service Company
Roy Upendra
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