高強度系CFRPモードI層間はく離き裂進展抵抗の測定に及ぼす影響因子

概要

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High strelengt htype CFRP has low delamination resistance, although it has high mechanical prop erties. In this low delamination resistance, an opneig mode (mode I) delamination crack growth resistance is the most important because this mode shows relatively lower resistamce and usually occurs in actual structures. Recently, the energy release rate concept has been applied to estimate this model delamination resistance. Various test metbods have been Proposed to measure it using double cantilev er beam test specimens. The test method, however, has not been established yet and the micromechanism of delamination is still unknown. In this study, therefore, Various factors affecting the testing, such as large deformation of beam, jig and loading rate, are discussed based on a beam theory and th e experiments of mode I delamitlation resistance using higb strerngth type CFRP (T-400/epoxy) . The results obtained are as follows. It was reconfirmed that the effects of large deflection and jig are negligible under the condition of low deflection value (0.1<δ/a>0.25). (2) It is considered that the fiber bridging breaks by time depended fracture mechanisms. (3) Stick-slip delamination growth occurs under a low loading rate condition. (4) The modeling of the stick-slip delamination growth can be successfully made by considering visco-elastic property of resin.
1991-04-15