Abstract
Effects of the number of screw revolutions in an injection molding machine and the notch shape of molded specimens on fracture mechanisms of notched FRPP are investigated by means of the acoustic emission (AE) technique and scanning electron microscopy. The relationship between the number of screw revolutions and the fiber orientation in the molded specimen is determined. It is found that the usual AE characteristics are affected by the fiber orientation and radius of curvature at the notch tip. It is estimated from the AE frequency analysis that the damage modes are also affected by the fiber orientation and the radius of curvature at the notch tip. The estimation of damage modes are compared via microfractographs at the notch tip.
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