高g值冲击下薄壁管抗冲击性能研究

Impact Resistance Performance of Thin-walled Tube under High g Impact

中文关键词:  高g值加载  薄壁管  抗冲击  缓冲效率

英文关键词:high g loading  thin-walled tubes  impact resistance  buffer efficiency

中文摘要:

      目的 在弹箭发射与侵彻时，弹箭系统内部测试电路元件承受高g值加载。为提高电路元件的存活度，需对其进行缓冲防护。方法 利用气炮装置发射钢弹，撞击底座获得高g值加载，研究铝合金薄壁管的抗冲击特性，并基于LS-DYNA研究薄壁管壁厚和冲击速度对高g值冲击过程的影响。结果 钢弹冲击速度增加，底座的激励加速度幅值(Acceleration Amplitude of Excitation，AAE)逐渐增加，单层管(CirT)和多胞管(MT)的缓冲效率分别达到91.0%和74.7%，数值模拟所得AAE和响应加速度幅值(Acceleration Amplitude of Response，AAR)与实验结果误差<5%，薄壁管壁厚对激励加速度几乎无影响。结论 本文所得结果对轻质元件的高g值冲击防护有较强的指导意义。

英文摘要:

      During missile launch and penetration, the internal testing circuit components of the missile system are subject to high g overload. The work aims to apply buffer protection to the circuit components to improve the survival of the circuit components. The air gun device was used to launch steel bullets to impact the base under high g loading, so as to study the impact resistance characteristics of aluminum alloy thin-walled tubes. Based on LS-DYNA, the effect of thin-walled tube wall thickness and impact velocity on the high g impact was studied. As the impact velocity of the steel ball increased, the acceleration amplitude of excitation (AAE) at the base gradually increased. The buffering efficiency of single-layer tubes (CirT) and multi cell tubes (MT) reached 91.0% and 74.7%, respectively. The error between the acceleration amplitude of excitation and the acceleration amplitude of response (AAR) obtained from numerical simulation and experimental results was not more than 5%, and the wall thickness of thin-walled tubes had almost no effect on the excitation acceleration. The results obtained in this article have strong guiding significance for the high g impact protection of lightweight components.