In-situ on-line structural failure detection system, its preparation and operation
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United States of America Patent
Stats
-
Oct 15, 1985
Grant Date -
N/A
app pub date -
Dec 22, 1981
filing date -
Dec 22, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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