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Proceedings Paper

Determination of process-induced residual stress in composite materials using embedded fiber optic sensors
Author(s): Craig M. Lawrence; Drew V. Nelson; Thomas E. Bennett; Jay R. Spingarn
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Paper 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.

Paper Details

Date Published: 6 June 1997
PDF: 12 pages
Proc. SPIE 3042, Smart Structures and Materials 1997: Smart Sensing, Processing, and Instrumentation, (6 June 1997); doi: 10.1117/12.275732
Show Author Affiliations
Craig M. Lawrence, Stanford Univ. (United States)
Drew V. Nelson, Stanford Univ. (United States)
Thomas E. Bennett, Sandia National Labs. (United States)
Jay R. Spingarn, Sandia National Labs. (United States)


Published in SPIE Proceedings Vol. 3042:
Smart Structures and Materials 1997: Smart Sensing, Processing, and Instrumentation
Richard O. Claus, Editor(s)

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