Abstract
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, Gc, 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 Gc 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 Gc has been examined. Effects of the initial crack on Gc 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.
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