Method for preassembling a composite coupling
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United States of America Patent
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-
Apr 26, 1988
Grant Date -
N/A
app pub date -
Oct 7, 1985
filing date -
Oct 7, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
There is disclosed a method of preassembling a composite coupling. The coupling has at least one heat-recoverable driver member and at least one metallic insert. The driver member is made from a nickel/titanium-based shape memory alloy having a transformation hysteresis defined by M.sub.s, M.sub.f, A.sub.s and A.sub.f temperatures. The method includes the steps of overdeforming the driver member by applying a stress sufficient to cause nonrecoverable strain in the driver member so that the A.sub.s and A.sub.f temperatures are temporarily raised to A.sub.s' and A.sub.f', respectively; removing the stress; engaging the driver member and insert; and then warming the driver and insert to a temperature less than A.sub.s'. There is also disclosed a composite coupling processed by this method.
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