Damage assessment in composites with embedded optical fiber sensors

Raymond M. Measures; Kexing Liu; Michel LeBlanc; Keith McEwen; K. Shankar; Rod C. Tennyson; Suzanne M. Ferguson

doi:10.1117/12.46590

1 October 1991 Damage assessment in composites with embedded optical fiber sensors

Raymond M. Measures, Kexing Liu, Michel LeBlanc, Keith McEwen, K. Shankar, Rod C. Tennyson, Suzanne M. Ferguson

Proceedings Volume 1489, Structures Sensing and Control; (1991) https://doi.org/10.1117/12.46590
Event: Orlando '91, 1991, Orlando, FL, United States

Abstract

Damage assessment within composite structural components can be undertaken with embedded optical fiber sensors in two very different ways: the optical fibers can be damage sensitized so they fracture when the composite is critically loaded or they can be made into very sensitive strain sensors that can detect acoustic energy released when the composite is subjected to sufficient load to cause internal damage. We shall report on our latest research for these two approaches. This includes the results of impact tests on the first full scale aircraft composite leading edge instrumented with a 'damage assessment system' comprising a multilayered, embedded grid of 250 damage sensitized optical fibers. We shall also report on the extension of this work to glass fiber/epoxy shells, and the first correlation of acoustic emission signals (detected by embedded interferometric fiber optic sensors) to specific cracks and delaminations within Kevlar/epoxy specimens.

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Raymond M. Measures, Kexing Liu, Michel LeBlanc, Keith McEwen, K. Shankar, Rod C. Tennyson, and Suzanne M. Ferguson "Damage assessment in composites with embedded optical fiber sensors", Proc. SPIE 1489, Structures Sensing and Control, (1 October 1991); https://doi.org/10.1117/12.46590

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KEYWORDS

Optical fibers

Composites

Fiber optics sensors

Acoustics

Sensors

Signal detection

Acoustic emission

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