Measuring and testing – Specimen stress or strain – or testing by stress or strain... – Specified electrical sensor or system
Patent
1981-12-22
1985-10-15
Ciarlante, Anthony V.
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
Specified electrical sensor or system
73799, G01B 2100
Patent
active
045466521
ABSTRACT:
Structural failures, as in metal aircraft structures, are rapidly detected and measured by use of a new detection system comprising a thin film adhesively bonded to the metal structural surface to be monitored, said film containing a plurality of thin continuous strips which are adapted to be broken when a crack appears under the strips, said strips being substantially parallel but insulated from each other and the metal structural surface and arranged in a pattern such that there is frequent change in direction of the strips as in a zig-zag or rectangular pattern, each of said strips constituting a separate circuit joined to an electric power source and a sensing and recording means capable of detecting and recording any circuit failure caused by disruption of the metal strip, said disruption being caused by the formation of a crack under the said strip.
REFERENCES:
patent: 2986928 (1961-06-01), White
patent: 3453873 (1969-07-01), Lambert
patent: 3509942 (1970-05-01), Lindberg
patent: 3596269 (1971-07-01), Laska
patent: 4255974 (1981-03-01), Dufrane et al.
Natesh Ram
Virkar Anil V.
Brown Joseph W.
Ciarlante Anthony V.
Materials Research, Inc.
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