Microballoon impregnated fiber reinforced RTV film compression s

Details Microballoon impregnated fiber reinforced RTV film compression s Microballoon impregnated fiber reinforced RTV film compression s

1997-06-30

1998-09-15

Noori, Max H

Measuring and testing

Specimen stress or strain, or testing by stress or strain...

By loading of specimen

73768, G01N 308

Patent

active

058082077

ABSTRACT:
A thin film stress sensor measures the maximum compressive stress between two elements that are compressed together. The sensor is formed from a thin RTV film impregnated with microballoons and reinforced with carbon fibers to restrain the lateral deformation of the RTV so that more uniform pressure can be exerted on the microballoons when the sensors are uniaxially compressed. The testing method includes applying a compressive stress up to an maximum compressive stress to rupture a first portion of the microballoons, and then applying an interrogating pressure causing acoustic emissions emitted by a second portion of the microballoons when the interrogating pressure equals the equivalent maximum compressive stress, so as to determine the maximum compressive stress.

REFERENCES:
patent: 3712221 (1973-01-01), Voigt, Jr. et al.
patent: 4077253 (1978-03-01), Grisell
patent: 4932264 (1990-06-01), Hawkins et al.
patent: 5251414 (1993-10-01), Duke
patent: 5675089 (1997-10-01), Hawkins

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