Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Patent
1995-10-19
1996-09-10
Chilcot, Richard
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
73766, G01N 1908
Patent
active
055535046
ABSTRACT:
An apparatus for preventing, detecting, and predicting the formation and propagation of cracks in structural members. The apparatus includes a plurality of strain sensors integrally formed with a patch to be fixed to an area on the surface of a structural member. The patch operates to reduce stress levels in the patch-covered area for deterring the formation or propagation of a crack therein. The sensors monitor changes in the strain field in the patch-covered area for detecting crack formation and detection. The apparatus may also include a temperature-compensating strain sensor and a temperature sensor both integrally formed with the patch for detecting and predicting crack formation and propagation, respectively.
REFERENCES:
patent: 4179940 (1979-12-01), Oertle et al.
patent: 4806012 (1989-02-01), Meltz et al.
patent: 5227731 (1993-07-01), Prabhakaran et al.
patent: 5276501 (1994-01-01), McClintock et al.
Lyons Donald R.
Reich Stanley M.
Shyprykevich Peter
Anderson Terry J.
Chilcot Richard
Grumman Aerospace Corporation
Hoch Jr. Karl J.
Patel Harshad
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