It is difficult to accurately judge the crack propagation behavior at the interfaces of layered composite structures under impact loads. By mainly considering the influence of the loading rate on the interaction between a crack and an interface, this paper presents a new discrimination model to predict the crack propagation behavior. Based on the energy release rate criterion, which is used to judge the static crack propagation behavior at the interface of a composite structure, a discrimination model was established by introducing a general function related to the crack growth rate and combining the relationship between the loading rate and the energy release rate of the crack tip. The prediction results of the discrimination model were in good agreement with the experimental and numerical simulation results. Taking the mud–sandstone composite layer of Shihezi Formation in Linxing block as the research object, parameter sensitivity analysis was conducted using the control variable method. Parametric analysis results revealed that cracks are more likely to penetrate from high-shear-modulus, low-Poisson’s-ratio, and high-density materials into low-shear-modulus, high-Poisson’s-ratio, and low-density materials. A small interface inclination and large interface fracture energy are beneficial for crack penetration. In extreme layered composite structures, such as those with significant interlayer differences, large inclination angles, and small interface fracture energies, increasing the loading rate can make the deflection crack penetrate the interface.

冲击载荷作用下层状复合结构界面裂纹扩展行为难以准确判断。本文主要考虑加载速率对裂纹与界面相互作用的影响，提出了一种新的判别模型来预测裂纹扩展行为。基于用于判断复合结构界面处静态裂纹扩展行为的能量释放率准则，引入与裂纹扩展速率相关的一般函数，结合加载速率之间的关系，建立判别模型。和裂纹尖端的能量释放率。判别模型的预测结果与实验和数值模拟结果吻合较好。以临兴区块石河子组泥砂岩复合层为研究对象，采用控制变量法进行参数敏感性分析。参数分析结果表明，裂纹更有可能从高剪切模量、低泊松比和高密度材料渗透到低剪切模量、高泊松比和低密度材料。小的界面倾角和大的界面断裂能有利于裂纹穿透。在极端层状复合结构中，如层间差异显着、倾角较大、界面断裂能较小的结构，增加加载速率可使偏转裂纹穿透界面。采用控制变量法进行参数敏感性分析。参数分析结果表明，裂纹更有可能从高剪切模量、低泊松比和高密度材料渗透到低剪切模量、高泊松比和低密度材料。小的界面倾角和大的界面断裂能有利于裂纹穿透。在极端层状复合结构中，如层间差异显着、倾角较大、界面断裂能较小的结构，增加加载速率可使偏转裂纹穿透界面。采用控制变量法进行参数敏感性分析。参数分析结果表明，裂纹更有可能从高剪切模量、低泊松比和高密度材料渗透到低剪切模量、高泊松比和低密度材料。小的界面倾角和大的界面断裂能有利于裂纹穿透。在极端层状复合结构中，如层间差异显着、倾角大、界面断裂能小等，增加加载速率可使偏转裂纹穿透界面。高密度材料分为低剪切模量、高泊松比和低密度材料。小的界面倾角和大的界面断裂能有利于裂纹穿透。在极端层状复合结构中，如层间差异显着、倾角大、界面断裂能小等，增加加载速率可使偏转裂纹穿透界面。高密度材料分为低剪切模量、高泊松比和低密度材料。小的界面倾角和大的界面断裂能有利于裂纹穿透。在极端层状复合结构中，如层间差异显着、倾角较大、界面断裂能较小的结构，增加加载速率可使偏转裂纹穿透界面。