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Proceedings Paper

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

This paper presents the results of experiments to measure the internal strains and temperatures that are generated in carbon fiber/epoxy composite specimens during processing using embedded fiber optic strain sensors and thermocouples. Measurements of strain and temperature, combined with a computational model, offer the potential for non-destructive, real-time determination of residual stress in composites, and may be useful for process monitoring and control. Extrinsic Fabry-Perot interferometers, Bragg grating strain sensors, and thermocouples were embedded in graphite/epoxy composite laminates prior to cure. The specimens were cured in a press, and the internal strains and temperatures developed during processing were monitored and recorded. The results are compared with expected values, and limitations of the experimental technique are discussed.

Paper Details

Date Published: 30 May 1996
PDF: 9 pages
Proc. SPIE 2718, Smart Structures and Materials 1996: Smart Sensing, Processing, and Instrumentation, (30 May 1996); doi: 10.1117/12.240892
Show Author Affiliations
Craig M. Lawrence, Stanford Univ. (United States)
Drew V. Nelson, Stanford Univ. (United States)
Jay R. Spingarn, Sandia National Labs. (United States)
Thomas E. Bennett, Sandia National Labs. (United States)

Published in SPIE Proceedings Vol. 2718:
Smart Structures and Materials 1996: Smart Sensing, Processing, and Instrumentation
Kent A. Murphy; Dryver R. Huston, Editor(s)

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