含内聚裂纹弹性体的能量释放率与断裂能OA北大核心CSTPCD

According to the cohesive crack model,there is a cohesive region near the crack tip of a cracked e-lastomer,and the expressions of fracture parameters in the cohesive region make the core research content.Under the assumption of a cohesive zone existing at the tip of a linear crack in an elastic plate,the zone was re-placed by a fictitious linear crack,and a definite nonlinear functional relationship between the fictitious crack opening displacement and the cohesion was given.An elastic plate with a mode-Ⅰ edge crack was taken as an example,and the analytical solution satisfying the fictitious crack condition was derived.On this basis,the cal-culating methods for energy release rate Ga of physical crack tip propagation and energy release rate Gb of cohe-sive crack tip propagation,were proposed.The relationships between Gb,the J integral and fracture energy GF were discussed.The results show that,critical energy release rate Gbc equals fracture energy GF,which can be used as a fracture parameter for crack instability propagation of materials with cohesive regions.The proposed method is applicable to all elastic bodies with mode-Ⅰ,Ⅱ and Ⅲ cohesive cracks.