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Abstract
We applied mechanoluminescence (ML) sensor, which is a polymer composite film made of a ML material (europium doped strontium aluminate, SrAl2O4:Eu) and epoxy resin, to evaluate relative strain distribution of carbon fiber reinforced plastics (CFRPs) laminates with bidirectional fiber bundles (twill weave). It was found that the ML sensor attached to the twill-woven CFRP laminate exhibited a distinctive ML pattern in a tensile testing, and the ML pattern was similar to the twill pattern. As a result of analysis of the obtained ML images, the higher ML intensity areas were found to be a longitudinal fiber bundles (tensile direction) and the lower ML intensity areas were the transverse fiber bundles. Based on the results of this study, it is concluded that the ML sensor can experimentally visualize the non-uniform mechanical behavior of the twill-woven CFRP laminates in the tensile testing.
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