Overload Characteristics of Rigid Projectile Impacting Honeycomb Structures at High Velocities

doi:10.12382/bgxb.2022.0023

Abstract

Abstract:

In order to evaluate the reliability of critical weapon components in high overload environments, a new technology of high overload environment simulation based on the rigid projectile impacting the honeycomb structure was proposed. The acceleration, velocity, displacement response characteristics and dynamic behaviors were studied with the light gas gun experiment. The difference of overload response time histories in the process of the projectile impacting the honeycomb structure under different high impact velocities was analyzed. The results showed that: crushing is a highly localized mechanical behavior, which firstly happened at the top of the honeycomb structure and then spread to the bottom as the projective moved; the compression process of the honeycomb structure subjected to projectile impact can be divided into three stages: initial impact, steady compression and compression to densification, which corresponds to the response characteristics of acceleration, velocity and displacement curves of the projectile; the velocity curve of initial impact stage showed an obvious ladder-shaped decline, resulting from the periodic traveling of stress waves in the projectile; all deceleration curves obtained from the three experiments had a similar peak at the initial stage of each experiment; the lasting time of the steady compression stage decreased with the increase of the initial velocity of the projectile, but the overload peak of the densification stage showed an opposite trend.

Key words: rigid projectile, honeycomb structure, overload characteristics, experiment

WEI Xin, ZHANG Yunfeng, ZHAO Qifeng, SUI Yaguang, ZHANG Dezhi, ZHANG Qiancheng. Overload Characteristics of Rigid Projectile Impacting Honeycomb Structures at High Velocities[J]. Acta Armamentarii, 2023, 44(5): 1321-1329.

Figures/Tables 14

Fig.1 Schematic of the projectile, recorder and sabot

Fig.2 Schematic of the projectile and honeycomb structure

Fig.3 Experimental model

Table 1 Experimental conditions

序号	弹体质量/kg	弹体速度/ (m·s^-1)	蜂窝壁厚/mm	蜂窝单元边长/mm	蜂窝长度/mm
1	8.18	182	0.30	5	400
2	8.38	218	0.30	5	400
3	8.30	246	0.30	5	400

Fig.4 Impact compression process of the honeycomb structure in the first experiment (v=182m/s)

Fig.5 Impact compression process of the honeycomb structure in the second experiment (v=218m/s)

Fig.6 Impact compression process of the honeycomb structure in the third experiment (v=246m/s)

Fig.7 Acceleration curve of the first experiment

Fig.8 Acceleration-time history curves of the three conditions

Fig.9 Acceleration-time history curves after filtering of the three conditions

Table 2 Comparison of experimental peak acceleration and theoretical peak acceleration

序号	弹体速度/ (m·s^-1)	实验加速度峰值/10⁴g	预测加速度峰值/10⁴g	偏差/ %
1	182	-2.10	-2.13	1.4
2	218	-2.19	-2.09	2.3
3	246	-1.93	-2.11	9.3

Fig.10 Velocity-time history curves of the three conditions

Table 3 Total energy absorption and average acceleration from the three experiments

序号	弹体速度/(m·s^-1)	E_bd/kJ	a_m/10⁴g
1	182	134.0	0.45
2	218	172.9	0.58
3	246	262.4	0.88

Fig.11 Displacement-time history curves of the three conditions

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