1994 年 43 巻 490 号 p. 833-839
This paper discusses the mechanism of matrix cracking evolution in crossply composite laminates. The evolution of matrix cracking cannot be understood by the notion of ‘strength’ of cracking ply, since matrix cracks are sequentially formed above the stress level of the strength of cracking ply. By assuming that the ply has inherently a distribution of defects which act as the nucleation sites of matrix cracks, the cracking mechanism is discussed. This mechanism can explain the behavior of the averaged maximum stress in the whole stage of evolution. A simple numerical simulation is performed in order to visualize the cracking behavior and the change in stress due to cracking.