圆形效应靶薄板的冲击响应建模及参数影响分析

Impact Response Modeling and Parameter Influence Analysis of a Circular Effect Target Sheet

为了对压力测量效应靶变形与压力转换的影响因素进行研究,以圆形效应靶薄板为研究对象,在理想刚塑性理论的基础上,建立了冲击波压力作用下固支圆薄板的冲击响应模型,得到了薄板塑性变形与冲击波压力峰值、正压作用时间的映射关系。然后设计了外场爆炸冲击波测试试验,对冲击响应模型进行了验证;在此基础上,提出了薄板塑性变形与压力幅值转换的影响因子模型,讨论了不同参数对压力转换的影响。结果表明:建立的响应模型能够描述薄板在冲击波作用下的塑性变形,效应靶变形与压力的转换关系与冲击波正压作用时间和薄板直径有关,当正压作用时间大于10倍谐振周期时,变形与压力转换和正压作用时间无关;而在一定的正压作用时间范围内,影响因子随着薄板直径的减小而趋于稳定,减小直径可以提高效应靶的应用范围。可见,研究结果为压力效应靶的应用及结构设计提供了理论基础。

In order to study the influencing factors of the pressure-deformation transformation relation of the pressure measurement effect target,a shock response model of a circular plate with fixed support under shock wave pressure was established based on the ideal rigid-plastic theory.The mapping relationship between plastic deformation of thin plate and shock wave pressure peak and positive pressure action time was obtained.After that,the outfield explosion shock wave test was designed to verify the impact response model.On this basis,an influence factor model of plastic deformation and pressure amplitude transformation was established,and the influence of different parameters for the pressure-deformation transformation was discussed.The results show that the response model can be used to describe the plastic deformation of the thin plate under shock wave well.The pressure-deformation relationship of the effect target is related to the duration of positive pressure and the diameter of the thin plate.The pressure-deformation transformation relation was not affected by the duration of positive pressure when it was greater than 10 times of the resonance period.And within a certain range of the duration of positive pressure,the influence factor tends to be stable with the decrease of the diameter of the thin plate,which significantly improves the application range of the effect target.The research can provide a theoretical basis for the application and structural design of pressure measurement effect targets.