The two-dimensional (2D) delamination growth in fiber-reinforced polymer (FRP) laminates with in-plane isotropy under Mode I loading condition was numerically investigated using finite element analyses. Two sizes of plate models were developed, focusing on different fracture stages. Cohesive elements were employed to simulate the fracture behavior in the presence of large-scale bridging (LSB). The influences of the pre-crack shape/area, loading zone shape/area and fracture resistance were parametrically studied. It was found that either a flatter pre-crack shape or a flatter loading zone shape could result in higher initial structural stiffness and less uniform distribution of the strain energy release rate (SERR) along the pre-crack perimeter during crack initiation and early propagation. However, they had only a minor effect on the stiffness after full fiber bridging development in all directions. The plates finally achieved constant stiffness, which increased linearly with the fracture resistance. The final crack shape was dependent on the loading zone shape and area, but the effects were relatively weak.

使用有限元分析方法，数值研究了模式I加载条件下具有面内各向同性的纤维增强聚合物（FRP）层压板的二维（2D）分层生长。针对不同的断裂阶段，开发了两种尺寸的板块模型。在存在大规模桥接（LSB）的情况下，采用粘性元件来模拟断裂行为。参数化研究了裂纹前形状/面积，加载区形状/面积和抗断裂性的影响。已发现，较平整的裂纹前形状或较平坦的加载区形状可能会导致较高的初始结构刚度，以及在裂纹萌生和早期传播期间沿裂纹前周长的应变能释放率（SERR）的分布较不均匀。然而，在各个方向上全纤维桥接发展之后，它们对刚度的影响很小。板最终获得恒定的刚度，该刚度随抗断裂性线性增加。最终的裂纹形状取决于加载区的形状和面积，但影响相对较弱。