Abstract
Carbon fiber reinforced plastics (CFRP), which is one of the advanced composites, have excellent properties of specific strength and rigidity. They have been used for lightening the mass of machines and the structures. It is thought that the fracture mechanisms of composite materials are so complicated that an investigation is necessary to make clear the fracture behaviors and mechanisms of the materials. Therefore, by using the results of frequency analysis of the acoustic emission of the model CFRP in the previous paper, it is found, in this paper, that the acoustic emission which is produced by the deformation and the fracture of unidirectional composite laminates and three directional ones are classified by the frequency, and that the fracture mechanisms of these composite materials can be clarified.
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