Abstract
The acoustic emission test has been carried out on the Class A-SMC material which has an excellent surface property as a material for automobiles.The AE amplitude increased in the order of the resin fracture, the debonding between resin and calcium carbonate, the debonding between resin and fibers, the fiber pulling out, and the fiber breaking. However, as the AE amplitude depends on the position of AE sensors and the amplification degree, the AE amplitude distribution gives only a relative estimation of fracture modes of the constituent materials in composites.From the results of frequency analysis and the consideration about the AE amplitude distribution, it is found that the frequency ranges corresponding to the resin fracture, the debonding between resin and calcium carbonate, the debonding between resin and fibers and also the fiber pulling out, and the fiber breaking are 80-180, 240-450, 180-250, and 250-400kHz, respectively.
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