System for stabilizing dimensional properties of cured composite

Details System for stabilizing dimensional properties of cured composite System for stabilizing dimensional properties of cured composite

1986-01-21

1989-02-21

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

73587, 264 406, 264236, 264237, 264348, 264347, 425143, G01N 2904, B29C 6566, B29C 6714

Patent

active

048062928

ABSTRACT:
Method and apparatus are disclosed for inducing dimensional stability in cured composite structures using acoustic emission analysis to identify the appropriate level and extent of coincident thermal conditioning. Temperature of the composite structure is lowered at a bounded rate to a minimum temperature typical of the intended operating environment. Passive stress wave acoustic emissions of the composite are analyzed to generate a signature of stress relaxation events over time. When the rate of stress relaxation events decreases below a predetermined percentage of the maximum rate, and remains below that level for a period of time sufficient to predict operational stability, thermal conditioning is terminated.

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McGraw-Hill Dictionary of Physics and Mathematics, Daniel N. Lapedes, Editor in Chief, New York, McGraw-Hill Book Company, 1978.

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