GFRPの酸環境下でのき裂進展速度に関する微視力学的考察

抄録

This paper is concerned with the crack propagation due to stress corrosion cracking in glass fiber reinforced plastics (GFRP) under acid environments. As a result of previous works, it is well-known that, based on linear elastic fracture mechanics, the relationship between the crack propagation rate da/dt in GFRP under acid environments and the stress intensity factor K at the crack tip is expressed in the form da/dt=AK^m where A and m are constants. This relationship has been established experimentally and no literature has dealt with the theoretical examination of the relationship. In this paper, the micromechanics study has been made on the relationship by using the model of crack propagation due to stress corrosion cracking in GFRP proposed by Hull et al. It is shown that the relationship can be theoretically derived, and the effects of experimental conditions and the material constants of glass fiber on the crack propagation rate are clarified.