Abstract
Based on the AE source characterization method proposed in the first report, we examined the dynamics of microfractures in unidireational GFRPs with different interfacial qualities. Three types of microfractures were revealed to occur by AE source characterization. AE event counts due to the Mode-I fiber breakage, Mode-I and-II interfacial fractures were observed at higher stresses in GFRP with poor interfacial quality (with wax in matrix) than in GFRP with good interface quality, but increased rapidly with an increase of stress. Dynamics of microfractures were found to change depending on the interface quality.
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