一方向カーボン/エポキシ積層板のモードI層間破壊特性

概要

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Mode I interlaminar fracture toughness of CFRP has been examined using DCB (Double Cantilever Beam) specimenn in this paper. A new DCB specimen has been developed in order to obtain the accurate fracture toughness value, G_c, using the compliance method. Interpolation equations of crack length, energy release rate and compliance are obtained using the finite element method. Based on the equations, a computer-aided testing system has been developed, by which the relation between the crack length and G_c can be obtained automatically. Unidirectionally reinforced Carbon/Epoxy laminates have been used for the test. The initial cracks were introduced in two ways, by inserting PTFE film on the midplane during fabrication and by cutting mechanically after curing. Behavior of the acoustic emission (AE) has also been measured during the test, and the relation between the amplitude distribution and G_c has been examined. Effects of the initial crack on G_c have been examined and reasonable fracture toughness values have been obtained by the proposed method for the specimens with cracks prepared by both of the mechanical crack with width of three plies and PTFE film.
社団法人日本機械学会の論文
1987-10-25