6 June 1997 Determination of process-induced residual stress in composite materials using embedded fiber optic sensors
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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.
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Craig M. Lawrence, Drew V. Nelson, Thomas E. Bennett, 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); doi: 10.1117/12.275732; https://doi.org/10.1117/12.275732
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