Determination of process-induced residual stress in composite materials using embedded fiber optic sensors

Craig M. Lawrence; Drew V. Nelson; Thomas E. Bennett; Jay R. Spingarn

doi:10.1117/12.275732

6 June 1997 Determination of process-induced residual stress in composite materials using embedded fiber optic sensors

Craig M. Lawrence, Drew V. Nelson, Thomas E. Bennett, Jay R. Spingarn

Proceedings Volume 3042, Smart Structures and Materials 1997: Smart Sensing, Processing, and Instrumentation; (1997) https://doi.org/10.1117/12.275732
Event: Smart Structures and Materials '97, 1997, San Diego, CA, United States

Abstract

A method to determine process-induced residual stress in composite materials using strain measurements from embedded fiber optic sensors is presented. This method allows non- destructive, real-time determination of residual macrostress in composite materials and may be useful for both process monitoring and control. Extrinsic Fabry-Perot interferometer strain sensors were embedded in Hercules AS4/3501-6 graphite/epoxy composite specimens prior to cure. The specimens were cured in a press, and the internal strains and temperatures developed during processing were monitored and recorded. Residual macrostresses were computed using these measurements and a viscoelastic model of the material. The results compare favorably with previous analytical predictions and experimental measurements from a destructive technique.

Citation Download Citation

Craig M. Lawrence, Drew V. Nelson, Thomas E. Bennett, and Jay R. Spingarn "Determination of process-induced residual stress in composite materials using embedded fiber optic sensors", Proc. SPIE 3042, Smart Structures and Materials 1997: Smart Sensing, Processing, and Instrumentation, (6 June 1997); https://doi.org/10.1117/12.275732

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