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采用细观力学方法以及虚拟裂纹闭合法(VCCT)对含有Z-pin增强复合材料双悬臂梁(DCB)结构Ⅰ型断裂韧性进行了研究。利用有限元法建立了结构模型,采用实体单元模拟复合材料层压板结构和非线性弹簧元模拟Z-pin。通过计算应变能释放率对含有不同体积分数Z-pin的复合材料层压板Ⅰ型断裂韧性与不含Z-pin的复合材料层压板Ⅰ型断裂韧性进行了对比分析。研究表明,含有Z-pin增强复合材料双悬臂梁(DCB)结构Ⅰ型断裂韧性在裂纹扩展过程中受到Z-pin桥联作用的影响而显著增强,且其增强效果与Z-pin的体积分数、处在桥联区的Z-pin数目均相关,这表明Z-pin增强方法能够有效提高复合材料层压板的分层扩展阻力。
The fracture toughness of type I double-cantilever beam (DCB) structure with Z-pin composite was investigated by the meso-mechanics method and virtual crack closure method (VCCT). The finite element method is used to establish the structural model. The solid element is used to simulate the composite material laminate structure and the nonlinear spring element is used to simulate Z-pin. The fracture toughness of composite laminates with different volume fraction of Z-pin and type Ⅰ fracture toughness of composite laminates without Z-pin were analyzed by calculating the strain energy release rate. The results show that the type Ⅰ fracture toughness of double-cantilever beam (DCB) composites with Z-pin reinforced composites is significantly enhanced by the Z-pin bridging effect during crack propagation, and the enhancement effect is related to the volume fraction of Z-pin , And the number of Z-pins in the bridging region are correlated, which shows that the Z-pin enhancement method can effectively improve the delamination resistance of composite laminates.