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A fastener capable of being applied with a low application force but yielding a high tightening force can be produced from a shape memory alloy which exists in a high- or low-temperature crystalline phase.
English (United States)
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A fastener capable of being applied with a low application force but yielding a
high tightening force can be produced from a shape memory alloy which exists in
a high- or low-temperature crystalline phase.
One possible shape for such a fastener is a disk with a wavy edge and a
central fastening hole. This shape would be cast in the high temperature, hard,
austenite phase of the shape memory alloy. In use, the above fastener is cooled
to temperatures stable for the deformable martensite phase. The fastener is then
flattened in a press to a shape which it will retain as long as it is kept below its
phase transformation temperature. In this flattened form, the fastener can then
be threaded onto a post and tightened. After warming to its transformation
temperature, the fastener edges will attempt to return to their original wavy shape
and thereby exert a tightening force in excess of that by which the fastener was