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23 July 1993 Detecting buckling of filament-wound cylinders with optical fibers
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This project demonstrated the implementation of embedded optical fibers as sensors for detecting the onset of shell buckling instabilities and compressive failure in composite cylinders. In the present work, five 6-inch diameter cylinders (four filament-wound and one prepreg tape) with integrated optical fiber strain sensors were fabricated and tested in compression. The cylinders were instrumented with an axial strain gage for local strain measurements and a helically wound 633 nm optical fiber for integrated strain measurement. The integrated strains along the optical fiber path were obtained by using a modified Mach- Zehnder interferometer with feedback electronics controlling PZTs in the reference arm. This distributed sensing technique provides a more reliable and sensitive means of detecting critical strains and the onset of pre-buckling deformations than the conventional local strain gage.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Suresh P. Pai, David W. Jensen, and Steven J. Claus "Detecting buckling of filament-wound cylinders with optical fibers", Proc. SPIE 1916, Smart Structures and Materials 1993: Smart Materials, (23 July 1993);

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