Numerical research on drop impact response characteristics of modular charge

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Journal of Vibration and Shock ›› 2025, Vol. 44 ›› Issue (12) : 279-289.

SHOCK AND EXPLOSION

Numerical research on drop impact response characteristics of modular charge

WU Shuang,YU Yonggang*,CHANG Renjiu

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Abstract

To analyze the damage characteristics of module charge dropping in a variety of ground environment, a dynamic finite element model of the modular charge was established on the basis of nonlinear finite element theory. The drop impact process of the modular charge was simulated using ANSYS/LS-DYNA software. A numerical simulation was conducted to evaluate the impact of dropping postures and ground characteristics on the stress, strain, and acceleration responses of module charge. The stress, strain and acceleration data of the modular charge when it was dropped from a height of 2m onto three different types of ground: sand, concrete, and Q235 steel plate, with three dropping postures: bottom-downward vertical drop, horizontal drop, and a 45° inclined drop. The primary objective is to examine the deformation and damage characteristics of combustible cartridges, with a particular emphasis on the influence of drop posture and ground characteristic. The results show that the ranking of module charge rupture risk is: inclined 45° dropping, horizontal dropping, and bottom down vertical dropping. The harder the ground is, the greater the stress, strain, and overload will be, and the time to reach the peak value will be shorter. Under the three dropping posture conditions, the nitrocellulose collides with each other but do not break, and the safety risk area is located at the bottom of the combustible cartridge. The rupture occurred at a 45° inclined drop to both the concrete ground and the Q235 steel plate. The damage modes observed include localised denting, matrix cracking and shearing. These research findings can be utilized as a reference for the improvement of the structural design of module charges.

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modular charge / drop impact / drop posture / ground characteristic / finite element simulation

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WU Shuang, YU Yonggang, CHANG Renjiu. Numerical research on drop impact response characteristics of modular charge[J]. Journal of Vibration and Shock, 2025, 44(12): 279-289

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