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Title: Measurement of process-induced strains in composite materials using embedded fiber optic sensors

Abstract

This paper presents the results of experiments to measure the internal strains and temperatures that are generated in graphite/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 interferometer, 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.

Authors:
;  [1]; ;  [2]
  1. Stanford Univ., CA (United States)
  2. Sandia National Labs., Livermore, CA (United States). Composites Lab.
Publication Date:
Research Org.:
Sandia National Labs., Livermore, CA (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
226060
Report Number(s):
SAND-96-8542C; CONF-960268-10
ON: DE96008710; TRN: AHC29610%%102
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Technical Report
Resource Relation:
Conference: Society of Photo-Optical Instrumentation Engineers (SPIE) smart structures and materials conference, San Diego, CA (United States), 26-29 Feb 1996; Other Information: PBD: [1996]
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; COMPOSITE MATERIALS; CURING; STRAINS; CARBON FIBERS; EPOXIDES; TEMPERATURE MEASUREMENT; EXPERIMENTAL DATA; STRAIN GAGES; MATHEMATICAL MODELS; NONDESTRUCTIVE TESTING; RESIDUAL STRESSES; PROCESS CONTROL

Citation Formats

Lawrence, C.M., Nelson, D.V., Spingarn, J.R., and Bennett, T.E. Measurement of process-induced strains in composite materials using embedded fiber optic sensors. United States: N. p., 1996. Web. doi:10.2172/226060.
Lawrence, C.M., Nelson, D.V., Spingarn, J.R., & Bennett, T.E. Measurement of process-induced strains in composite materials using embedded fiber optic sensors. United States. doi:10.2172/226060.
Lawrence, C.M., Nelson, D.V., Spingarn, J.R., and Bennett, T.E. Wed . "Measurement of process-induced strains in composite materials using embedded fiber optic sensors". United States. doi:10.2172/226060. https://www.osti.gov/servlets/purl/226060.
@article{osti_226060,
title = {Measurement of process-induced strains in composite materials using embedded fiber optic sensors},
author = {Lawrence, C.M. and Nelson, D.V. and Spingarn, J.R. and Bennett, T.E.},
abstractNote = {This paper presents the results of experiments to measure the internal strains and temperatures that are generated in graphite/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 interferometer, 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.},
doi = {10.2172/226060},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed May 01 00:00:00 EDT 1996},
month = {Wed May 01 00:00:00 EDT 1996}
}

Technical Report:

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