飞片厚度对冲击波压力峰值衰减特性的影响分析

Influence of flyer's thickness on the attenuation characteristics of shock wave's pressure peak

针对现有研究没有考虑飞片厚度对冲击波压力峰值衰减特性影响的问题,采用数值仿真的方法,通过建立不同厚度的飞片撞击无氧铜靶板的仿真模型,比较飞片与靶板撞击面脉冲宽度的仿真值和理论计算值,验证了数值仿真模型和仿真结果的可信度。采用最小二乘法对仿真数据进行处理,建立了飞片厚度与冲击波压力峰值指数衰减模型衰减系数之间的定量数学关系式,结果表明飞片厚度对冲击波压力峰值衰减特性的影响比较明显,飞片厚度与衰减系数近似成线性关系,飞片厚度越小,衰减系数越大,冲击波压力峰值的衰减速率越快,为相关实验设计与分析提供了理论参考。

In current studies, the influence of flyer＇s thickness on the attenuation characteristics of shock wave＇s peak pressure is rarely considered. Aiming at this problem, a simulation model was built to simulate the flyers of different thickness hitting an oxygen free copper target board and was solved by the numerical method. The simulated values of pulse width at the interface between flyer and target plate were compared with the theoretical values and the credibility of the numerical simulation model as well as the simulation results was verified. Processing the simulation data with least squares method and establishing the quantitative mathematical relationship between the flyer＇s thickness and the attenuation coefficient of the exponential decay model of shock wave＇s peak pressure, it is shown that the influence of flyer＇s thickness on the attenuation characteristics of Shock wave＇s peak pressure is obvious, and the relationship is approximately linear. The smaller the flyer＇s thickness is, the larger the attenuation coefficient as well as the faster the attenuation rate of shock wave＇s pressure peak will be. The results provide a theoretical reference to the design and analysis of related experiments.