Abstract
This study examined the applicability of acoustic emission (AE) method for the impact damage evaluation of CFRP pressure vessels. As a fundamental study, the characteristic features of AE signals obtained from impact-damaged CFRP laminates during tensile tests were analysed. Coupon-level CFRP specimens were prepared and impact forces were applied to the edge of the specimens so that the internal damages (e.g. delamination) could be observed from the edge-surface of the specimens. AE signals were detected via AE sensors mounted on the specimen surface during tensile loading test. For damaged specimen, it is found that the growth of delamination and the friction of delamination surfaces are the main AE sources. Also it is revealed that a large number of AE signals were detected during unloading period only for damaged specimens. These results showed a possibility that the AE method could be used for the impact damage evaluation of CFRP structures, including pressure vessels.
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