Investigation of the Dynamic Response of Soil/Steel Composite Structures of Vacuum Explosion Containment Vessels

Vacuum explosive welding technology has better performance, lower production cost, more environmentally friendly and other advantages. In order to meet the industrial demand for production in the area of metal composite plate, it is urgent to develop a super-large vacuum explosion containment vessel which can be used for explosive welding. Since soil is generally regarded as an effective energy-absorbing material, covering a certain thickness of soil above the steel plate can tremendously dissipate the energy of shock waves. Therefore, the dynamic response of the soil/steel composite structure on the explosion containment vessel under different explosive quantities and vacuum degrees was analyzed by experiments and numerical simulations. The dynamic strain curve collected by the experiment consists of an abruptly rising phase and a gradually decreasing vibration recovery phase. Comparing the peak strains, it was found that near-vacuum environment can significantly weaken the dynamic strain of soil/steel composite structures. Comparing the variation of the vibration amplitude of the composite structure with the cycles, it was found that reducing the amount of explosive and the vacuum degree inside the explosion containment vessel can effectively weaken the peak strain of the cover, and can also reduce the vibration amplitude of the composite structure. The dynamic response of soil/steel composite structure can be analyzed in four phases: Abrupt Increasing, Followed Impulse, Inertia Hysteresis, Static Pressure Stabilization.