To examine the crack propagation in quasi-brittle materials, cohesive models have been suggested by the works of researcher. They treat the existence of a process zone at the crack tip, with a suitable constitutive law, linking the tensile normal stress T and the relative displacement among the two crack edges. In this paper, we employed the cohesive model which examines the mode I interlaminar fracture into stitched reinforced composite laminates. The test configuration that we used in this study was a stitched reinforced double cantilever beam samples. A bilinear damage-rate-dependent cohesive traction–separation law is implemented to design the woven composite fracture and discrete nonlinear spring elements to characterize the stitches influence, its advantages and disadvantages. A novel macroscopic law adopted from a 1D micromechanical-stitching model is invented to model the stitches effect along the interface. The numerical simulations of double cantilever beam test with the present model present a significant agreement compared to the experimental results.

为了研究准脆性材料中的裂纹扩展，研究人员的工作提出了内聚模型。他们用适当的本构关系来处理裂纹尖端处的加工区，并将其连接到拉伸法向应力T。以及两个裂纹边缘之间的相对位移。在本文中，我们采用了内聚模型，该模型检查了层间断裂为缝合增强复合材料层压板的I型。我们在这项研究中使用的测试配置是缝合的加固双悬臂梁样品。采用双线性损伤率相关的内聚牵引力-分离法则来设计编织复合材料断裂和离散的非线性弹簧元件，以表征针迹的影响，优缺点。发明人从一维微机械缝合模型中采用了一种新颖的宏观定律，以对沿界面的缝合效果进行建模。与实验结果相比，本模型对双悬臂梁试验的数值模拟具有明显的一致性。