Evaluating damage in smart composite laminates using embedded EFPI strain sensors

G. Zhou; L. M. Sim

doi:10.1117/12.779392

1 November 2007 Evaluating damage in smart composite laminates using embedded EFPI strain sensors

G. Zhou, L. M. Sim

Proceedings Volume 6423, International Conference on Smart Materials and Nanotechnology in Engineering; 642313 (2007) https://doi.org/10.1117/12.779392
Event: International Conference on Smart Materials and Nanotechnology in Engineering, 2007, Harbin, China

Abstract

Extrinsic Fabry-Perot interferometric strain sensors were assessed for their sensing capacity and survivability via the surface mounting and the interior embedment in the carbon/epoxy beams. Artificial delaminations of two different sizes were used to simulate delamination. The embedded EFPI-SSs along with surface-mounted SGs were used to evaluate the effect of the delaminations on bending stiffness induced by quasi-static loading on a comparative basis. The response of EFPI-SSs was shown to be linear up to a bending strain of 0.5% and was in good agreement with the interpolated strains of surface strain measurements. The embedded EFPI-SSs were able to differentiate the effect of the tensile delaminations on bending stiffness. The interior strain data from embedded EFPI-SSs were shown to be very useful to extrapolate the strain difference on both sides of the delaminations as well as deducing local stresses.

Citation Download Citation

G. Zhou and L. M. Sim "Evaluating damage in smart composite laminates using embedded EFPI strain sensors", Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 642313 (1 November 2007); https://doi.org/10.1117/12.779392

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