Investigation on the Acceleration Distribution of the Missiles under Impact Loading
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摘要: 将高速钻地弹模拟为一个细长弹性直杆,以直杆一端施加一半正弦载荷脉冲和模拟弹体冲击刚性靶为例,采用线性波动分析方法给出杆中纵波的传播解,并基于ABAQUS和LS-DYNA软件分析应力波传播和弹体加速度的关系及对弹体上不同位置处加速度的影响,研究表明:应力波传播造成的质点局部加速度远远大于将弹性杆等价为刚体时计算得到的质心加速度,揭示了应力波传播效应和结构整体效应的区别。因此数据处理时,应根据不同的测试需求,使用相应的加速度信号处理方法。同时发现弹体的塑性变形将引起塑性应力波的传播和能量耗散,对弹体中的加速度分布产生显著影响,加速度曲线上的最大加速度峰值明显降低。Abstract: High speed earth missiles are modeled by slender elastic bars. A straight bar with one end applied by a half-sine impulse was studied by adopting a simple mechanical model and simplified boundary conditions. Missiles impacting rigid targets were simulated with LS-DYNA to study the dynamic response. The relation between the stress wave propagation and the acceleration of missiles was analyzed. The acceleration distribution of the missiles over the impacting direction was also investigated. The results show that there exists a large difference between the centroid acceleration of a rigid body and the true value when missiles strike targets. The measured data should be reasonably processed according to the different purposes. The plastic deformation of missiles causes the propagation of plastic stress wave and energy dissipatio, nwhich obviously affects the acceleration distribution on missile, sthe peak values on the acceleration versus time curves are largely reduced.
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Key words:
- ABAQUS /
- acceleration /
- boundary conditions /
- computer simulation
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