Method and apparatus for non-destructive testing of composite ma

Details Method and apparatus for non-destructive testing of composite ma Method and apparatus for non-destructive testing of composite ma

1982-07-27

1985-01-22

Gill, James J.

Measuring and testing

Vibration

By mechanical waves

73599, G01N 2904

Patent

active

044944080

ABSTRACT:
Methods and apparatus are disclosed for monitoring and controlling potential residual stress relief mechanisms in composite epoxy resin materials. Passive and injected, or active, acoustic signals originating in or propagated through a specimen material during the formation process produce signatures identifiable with known residual stress relief mechanisms. Real-time control of material temperature and external pressure during formation in response to acoustic signals measured or observed in relation to desired acoustic signature minimizes formation of undesired material properties.

REFERENCES:
patent: Re29886 (1979-01-01), Dembiak et al.
patent: 3442756 (1969-05-01), Lehtinen
patent: 3819915 (1974-06-01), Smith
patent: 3985712 (1976-10-01), Garst
patent: 4007631 (1977-02-01), Saifi et al.
patent: 4022555 (1977-05-01), Smith
patent: 4237538 (1980-12-01), LeDall
patent: 4275448 (1981-06-01), LeDall
"Characterization of Stability Mechanisms . . . " by DeLacy et al., Oct. 1982, from Proceedings of the 1981 Defense Advanced Research Projects Agency Conference, pp. 1-6.

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