Method for securing together and non-explosively separating multiple components
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United States of America Patent
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Sep 21, 1993
Issued Date -
N/A
app pub date -
Aug 27, 1991
filing date -
Sep 19, 1988
priority date (Note) -
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Abstract
A non-explosive separation device for releasably holding together components of equipment or apparatus which are to be separated under controlled conditions. The separation device and method of operation includes a retaining element having a strain concentrated portion which completely cleaves when strained at a predetermined magnitude. Strain is applied to the retaining element by an actuating element which is comprised of a solid state phase change material having a shape memory. The actuating element is deformed to an armed shape at a temperature below the phase-change transition temperature. The device is activated by heating the actuating element through its transition temperature so that it recovers toward its memory shape. The retaining element is strained beyond its ultimate strength so that it cleaves at the strain concentrated portion. One embodiment of the invention provides a method for the non-destructive testing of the integrity and readiness of the separation device as well as a method of calibrating the release point of the device.
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