Abstract
The fracture mechanisms of Class A-SMC (Sheet mould compound) composites with various contents of fiber and filler are studied by means of the acoustic emission monitoring. It is found that the loads of Pb and Rc at the inflection points of the total AE energy curve determined by means of the energy gradient method are in good agreement with the loads determined by means of the stress intensity factor method. The loads increase with an increase in the fiber content and show values near or equal to the maximum at 160 phr of the filler content. The damage of constituents at the loads are deduced from the AE amplitude distribution and the frequency analysis. The effects of the fiber and filler contents on damage initiation and growth are confirmed on the notch tip at the loads by means of the ink staining method.
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