The effect of particle size on the impact properties of an epoxy resin has been studied. This resin was filled with irregular‐shaped silica particles prepared by crushing fused natural raw quartz. These particles were sorted into six groups of different mean sizes ranging from 2 to 47 μm. The impact properties were measured by an instrumented Charpy type impact tested, which can record a load‐displacement curve during impact fracture. The impact absorbed energy ( U ) was measured using specimens having a U‐shaped blunt notch, and the impact fracture toughness ( K CI ) was measured using specimens having a sharp crack introduced by a fresh razor blade. As the particle size decreased. U increased and K CI decreased. The fractured surfaces and crack tip regions were observed using a scanning electron microscope to clarify the above phenomena.
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Nakamura et al. (1993) studied this question.
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