Power plants – Motor operated by expansion and/or contraction of a unit of... – Mass is a solid
Patent
1989-03-29
1990-02-13
Ostrager, Allen M.
Power plants
Motor operated by expansion and/or contraction of a unit of...
Mass is a solid
F03G 706
Patent
active
048995436
ABSTRACT:
A pre-tensioned shape memory actuator for providing remote actuation at relatively high loads. The actuator utilizes a two-way shape memory alloy which is pre-tensioned to a pre-tensioned position, then partially compressed to a position intermediate its original position and the pre-tensioned position so as to allow the actuator unit to then fore-shorten back to the original position when heated, and to expand back to the intermediate position when again allowed to cool. The alloy is a part of a clamping device which applies compressive force to a work object at the intermediate position under normal temperatures and releases the compressive force when heated. Upon cooling, the cycle is completed as the memory alloy reverts to the intermediate position and once again applies the compressive force to the work object.
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Perkins, J. et al., "Stress-Induced Martensitic Transformation Cycling and Two-Way Shape Memory Training in Cu-Zn-Al Alloys," Metallurgical Transactions A, vol. 15A, Feb. 1984, pp. 313-321.
Otterstedt Paul J.
Romanelli Marcello J.
Grumman Aerospace Corporation
Ostrager Allen M.
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