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Residual strain and Young's modulus determination in cross-ply composites using an embedded aramid fibre strain sensor

Authors
Journal
Composites Part A Applied Science and Manufacturing
1359-835X
Publisher
Elsevier
Publication Date
Volume
29
Issue
11
Identifiers
DOI: 10.1016/s1359-835x(98)00057-8
Keywords
  • Residual Strain
  • Cross-Ply Composites
  • Aramid Fibre Strain Sensor

Abstract

Abstract The enhancement of strain in the vicinity of a transverse ply crack in a (0°/90°) s GFRP laminate has been measured with the aid of an aramid fibre strain sensor embedded near one 0°/90° interface. This use of a laser Raman microprobe has revealed the strain profile parallel to the applied load in the 0° ply both very close to the interface and up to a distance of 25 m from the interface. The strain profiles obtained enable the positions of the cracks to be determined when the laminate is loaded or unloaded, such that local measurements of the residual strain after cracking and the reduction in Young's modulus as a consequence of cracking can be made.

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