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本文用动光弹方法和断裂力学理论研究了爆炸应力波与爆炸载荷驱动的高速扩展直裂纹的相互作用,观察了应力波对裂纹扩展方向和速度的影响。研究表明:当β(裂纹扩展方向与入射波阵面法线之间的夹角)=0°时,P波不改变裂纹扩展方向,但使其扩展速度发生变化,S波使裂纹方向改变;当0°<β<90°时,P波、S都使裂纹扩展方向改变,P波使其扩展速度降低,S波使其扩展速度提高。本文研究结果对于深刻理解工程爆破中相邻炮孔之间后爆炮孔产生的应力波与先爆炮孔产生的裂纹的相互作用机理具有一定的参考价值。
In this paper, the interaction between the explosion stress wave and the high-speed propagation straight cracks driven by the explosion load is studied using the dynamic photoelastic method and fracture mechanics theory. The influence of the stress wave on the crack propagation direction and velocity is observed. The results show that when β (the angle between the crack propagation direction and the normal to the incident wavefront) is 0°, the P wave does not change the direction of the crack propagation, but it changes the propagation speed, and the S wave changes the direction of the crack. When 0°<β<90°, the P-wave and S all change the direction of crack propagation, P-wave causes the expansion speed to decrease, and the S-wave increases the propagation speed. The research results in this paper have a certain reference value for a deep understanding of the interaction mechanism between the stress waves generated by the post-explosive blast holes in the adjacent blast holes and the cracks generated by the first blast holes in engineering blasting.