Abstract
AE monitoring tests are conducted on the specimens with different angles between the directions of applied load and the yarn of cross-ply CFRP or plain woven CFRP. Effects of water environment on the ratio of the loads Pb and Pc determined by the AE energy gradient method to the maximum load Rmax are discussed. The crack initiation and propagation at notch tip are observed by a monitor microscope and the damage modes of constituents are investigated by AE frequency analysis at or near the points of Pb/Pmax and Pc/Pmax. The ratios of Pb/Pmax and Pc/Pmax are important points to clarify fracture mechanisms of CFRP.
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