Cracks detected electrically while parts in service. Proposed method of remote electrical-continuity monitoring signals internal delaminations, cracks, and similar flaws in structural parts made of composite (fiber/matrix) materials. Entails only simple, cheap electrical monitoring equipment and relatively small investment in manufacturing equipment. Conductive thread stitched on composite tube remains continuous until delamination occurs. Delamination breaks thread and thereby presents open circuit to remote electrical monitor. Possible to repair or replace structural part before it fails.
Stitched Conductive Threads For Monitoring Composite Parts
NASA Tech Briefs ; 17 , 10
1993-10-01
Miscellaneous
No indication
English
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