Acceleration signal test and analysis for projectile penetrating into concrete
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摘要: 针对弹丸侵彻混凝土加速度信息获取及实测信号失效问题，采用弹载存储测试系统进行了实验，并基于LS-DYNA进行了高速碰撞过程的数值模拟，经处理后的数据曲线与实测侵深符合较好，数值模拟计算结果与实验结果较吻合。通过实验分析与理论推导相结合的方式对应力波、测试装置的基础运动和安装结构刚度、加速度计安装方式等部分影响因素进行了实测加速度信号的影响分析，分析结果对高g值冲击测试问题具有一定的参考价值。Abstract: Aimed at acceleration information acquisition and original signal failure problem of projectile penetrating into concrete, a projectile-borne storage testing system was used to conduct test, and the numerical simulation of high-velocity impact was carried out based on LS-DYNA, and the processed data curve corresponds to the measured penetration depth.The numerical simulation results and testing results are in good agreement, which indicates the correctness of this numerical simulation model establishment and parameter selection.The influence analysis of original acceleration signal is conducted on stress wave, fundamental motion of testing device, installed structural stiffness, installation way of accelerometer and some other influencing factors by way of combining test analysis with theoretical derivation, and the results of analysis have certain reference value for high-g-value shock test problem.
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Key words:
- mechanics of explosion /
- acceleration /
- projectile-borne storage testing system /
- penetration /
- LS-DYNA
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图 8 t=2 500μs侵彻过程的Von-Mises应力云图
Figure 8. Von-Mises stress nephogram of penetration process
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