Effect of double holes on crack propagation in PMMA plates under blasting load by caustics method

In this paper, the crack propagation behavior of a polymethyl methacrylate plate with double holes under explosive load is investigated. The propagation process of the explosion crack is recorded using a new digital laser dynamic caustics system, in which a high-speed camera and the explosion loading are employed. Firstly, the interaction process between the explosion stress wave and the empty hole reflected stress wave is analyzed using caustics. Moreover, the deflection law of the explosion crack is discussed. Secondly, the relationship between the propagation distance, velocity, stress intensity factor of the explosion crack tip, and the distance between the two holes is analyzed. Finally, the explosion process is analyzed using numerical simulations. It is concluded that the evolution law of the explosion stress wave in during the simulation process is similar to the caustics diagram. Lastly, the time-varying law of the stress between the double holes is obtained.

Automated summary

This paper investigates the crack propagation behavior of a polymethyl methacrylate plate with double holes under explosive load using a new digital laser dynamic caustics system. The interaction process between the explosion stress wave and the empty hole reflected stress wave is analyzed, as well as the deflection law of the explosion crack. The relationship between the propagation distance, velocity, stress intensity factor of the explosion crack tip, and the distance between the two holes is also discussed. Additionally, numerical simulations are used to analyze the explosion process and obtain the time-varying law of the stress between the double holes.