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Proceedings Paper

Bragg-grating-based multiaxial strain sensing: its application to residual strain measurement in composite laminates
Author(s): Jose Manuel Menendez; J. Alfredo Guemes
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Paper Abstract

The single peak of the spectrum of a fiber Bragg grating written in a standard low birefringence optical fiber splits in two peaks when a transverse strain field is applied due to the promotion of a strain induced birefringence. In a composite laminate, the theory predicts a plane stress state, which allows using a single embedded Bragg grating to obtain simultaneously both components of the strain field. After a brief review of the photoelastic theory, and the experimental verification of the suitability of the plane stress state hypothesis, some experiments are done with thick graphite fiber composite laminates with different lay-up sequences. Strong residual stresses are detected inside the laminate, in accordance with the theory of composite laminates. The response of embedded Bragg gratings must take into account these internal stresses in order to adequately interpret the experimental results.

Paper Details

Date Published: 12 June 2000
PDF: 11 pages
Proc. SPIE 3986, Smart Structures and Materials 2000: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (12 June 2000); doi: 10.1117/12.388115
Show Author Affiliations
Jose Manuel Menendez, Univ. Politecnica de Madrid (Spain)
J. Alfredo Guemes, Univ. Politecnica de Madrid (Spain)


Published in SPIE Proceedings Vol. 3986:
Smart Structures and Materials 2000: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials
Richard O. Claus; William B. Spillman, Editor(s)

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