Investigation on Dynamic Response Characteristic of the Confined Powder under Impact Loading

doi:10.12382/bgxb.2024.0026

Abstract

Abstract:

The density evolution and distribution characteristics of powder in a submunition under impact loadingare studied. Based on the porous material model and the test parameters of the powder, a simulation model of impact loading is established by using finite element analysis software. Machete impact tests under typical working conditions are compard. The simulated results are constant with the test results. The simulated results show that the density change of powder in the submunition during impact loading can be divided into the stable and growth stages, which can form four regions: densification, growth, retention and interspace regions. The width of each region changes linearly with the loading time, and the density distribution of powder has a significant gradient difference. The research results can provide reference for the investigation on the dynamic behavior of submunition which is impacted by the distribution changes of powder.

Key words: submunition, impact loading, powder, numerical simulation

CLC Number:

TJ413

JIN Wen, JIANG Jianwei, MEN Jianbing, LI Mei, LI Haifeng, ZHOU Xin. Investigation on Dynamic Response Characteristic of the Confined Powder under Impact Loading[J]. Acta Armamentarii, 2024, 45(S1): 183-190.

Figures/Tables 21

Fig.1 Machete hammer testing machine

Fig.2 Composition of hammer testing machine

Fig.3 Simplified submunition model

Fig.4 Discretization model of powder under impact loading

Fig.5 Density-pressure curves of typical porous material

Table 1 Materials of different parts

部件	材料
底座	4340钢
缓冲结构	橡胶
夹具&锤头	4340钢

Fig.6 Plastic compaction path of powder

Fig.7 Gauges on the powder

Fig.8 Overloading of the specimens

Fig.9 Density distribution of powder

Table 2 Relationship between ratchet number and overload

棘齿数	过载/g
6	4800
11	11000
13	14800
17	20500
22	29500

Fig.10 Specimens and structural composition of submunition

Table 3 Test results

Table 4 Results of Machete hammer test and simulation

样品序号	仿真/mm	试验/mm	误差/%
1	1.403	1.128	24.35
2	1.382	1.262	9.510
3	1.013	1.008	0.532

Table 5 Comparison between test and simulated results

Fig.11 Coordinate system of powder

Fig.12 Density distributions of powder before and after impact loading

Fig.13 Change process of density distribution

Fig.14 Four regions of the impacted powder

Fig.15 Density distributions of powder at different moments

Fig.16 Trend in the width variation of four regions

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