Study on the variation law of shock wave on the surface of landmine shell under touchdown explosion

Abstract

To study the variation law of shock wave pressure load on the surface of a certain type of landmine installed on the ground when explosive contact ground explosion, the TNT (C7H5N3O6) contact ground explosion experiments were conducted. Using the pressure test device that simulates the shape of a certain type of landmine to test the shock wave pressure load on its side and top surface respectively. Combined with the numerical simulation, studied the variation law of shock wave overpressure peak, positive pressure action time, and specific impulse on the side and top surface of the landmines at different scaled distances. The results show that the scaled distance less than 1.453 m/ kg1/3 is the range of near-range explosion. In this range, the shock wave pressure time history curve shows multiple peaks due to the combined action of the shock wave and detonation products. The closer to the explosion source, the pressure peak generated by the detonation product is significantly higher than the shock wave pressure peak, and the propagation speed of the shock wave is faster than that of detonation products. With the further increase of the blast center distance, the positive pressure action time of the shock wave on the side and top surface of the landmine it was increased significantly. The specific impulse of the shock wave on the side of the landmines is significantly higher than that on the top surface of the device at the same scaled distance. In the range of scaled distance less than 1.937 m/kg1/3, the specific impulse of the shock wave on both the side and top surfaces of the landmines increases at first and then decreases later, and its variation curve shows an obvious triangle. With the increase of the explosive quality, the rate of rise and attenuation of specific impulse of the shock wave is faster. With the further increase of blasting center distance, the specific impulse of the shock wave on the side and the top surface of the landmines tends to be equal at the same scaled distance, the continuous range is wide, and the explosive quality has little effect on it.