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Monitoring local strains in cracked cross-ply composites using an embedded aramid fibre strain sensor

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Abstract

Single aramid fibre strain sensors have been embedded in transparent glass-fibre reinforced epoxy resin cross-ply laminates. The sensors, located at the 0°/90°/0° ply interfaces, were interrogated by a remote laser Raman microprobe which enabled the changes in the longitudinal strain in the 0° plies caused by transverse cracking in the 90° ply to be monitored. Strain magnifications of up to about 6 were measured in the crack plane, 10 μm from the 0°/90° ply interface, and it is estimated that the region of enhanced strain extends to a distance of about 40 μm from the interface. Crack interactions were seen to occur for crack spacings of less than two transverse ply thicknesses.

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Arjyal, B.P., Galiotis, C., Ogin, S.L. et al. Monitoring local strains in cracked cross-ply composites using an embedded aramid fibre strain sensor. Journal of Materials Science 33, 2745–2750 (1998). https://doi.org/10.1023/A:1017513231203

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