A joint in the medium has a significant impact on the propagation of explosion stress wave and the growth of explosion-induced crack. In this work, the crack growth experiment in the PMMA(polymethyl methacrylate) medium with vertical open joints under explosion loading was first carried out on the digital laser dynamic caustics experimental system (DLDC), in order to analyze the crack initiation, growth and arrest of wing cracks, and examine how the DSIF(dynamic stress intensity factor) at crack tip and the velocity of crack growth changed. The process of stress wave propagation and crack growth in this experiment was effectively inverted using the discrete lattice spring model (DLSM), the stress changes at the midpoint and endpoint of the joint were compared, and the acting characteristics of stress wave were analyzed here. Finally, the differences in velocity and acceleration of crack growth of wing cracks were compared and examined under different dip angles of joints.

在介质中的联合对爆炸应力波的传播和爆炸引起的裂纹生长的显著影响。本工作首先在数字激光动态焦散实验系统（DLDC）上进行爆炸载荷作用下具有垂直开缝的PMMA（聚甲基丙烯酸甲酯）介质中的裂纹扩展实验，以分析裂纹的萌生、扩展和停止过程。翼裂纹，并检查裂纹尖端的 ​​DSIF（动态应力强度因子）和裂纹扩展速度如何变化。本实验采用离散晶格弹簧模型(DLSM)对应力波传播和裂纹扩展过程进行了有效的反演，比较了接头中点和端点处的应力变化，分析了应力波的作用特性。最后，