基于SPH方法对不同药型罩线性聚能射流形成及后效侵彻过程的模拟

为了解决传统基于网格的数值方法在模拟线性聚能射流问题时因大变形而导致网格畸变使计算难以进行的问题，本文通过自编程实现的光滑粒子法（SPH）对不同药型罩线性聚能装药射流形成及其侵彻金属靶板的过程开展了数值模拟研究，所实现的算法可以为线性聚能射流数值模拟研究提供新途径。本文所开展的研究首先基于已有的线性聚能射流试验模型进行模拟分析，采用SPH方法有效实现了线性聚能射流的形成过程，数值模拟获得的射流头部速度与试验比对误差在10%以内。然后建立了装药质量、药型罩质量和装药横截面宽度相同的前提下不同药型罩线性聚能射流模型，数值模拟获得不同药型罩形成的射流特征以及侵彻金属靶板的开口宽度和侵彻深度随时间的变化规律。研究得到的不同药型罩线性聚能射流形成及后效侵彻规律可为线性聚能射流的设计提供参考。

Simulation of the formation and subsequent penetration process of linear shaped charge jet with different liner by SPH method

In order to solve the mesh distorted problem, which is caused by large deformation, in simulation of linear shaped charge jet by traditional mesh based method, the self code of SPH method is applied to simulate the formation process of linear shaped charge jet and its subsequent penetration process of metal plate. The SPH method implemented in this paper can be taken as an alternative method for numerical study of linear shaped charge jet. Firstly, the numerical model of linear shaped charge jet based on experiment has been constructed and simulated by SPH method. The jet formation process of linear shaped charge has been simulated successfully by SPH method. Comparing numerical result with experiment data, the error of jet head velocity is less than 10%. Then, the jet formation processes of linear shaped charge with different liner but the same of charge mass, liner mass and width of charge cross section have been studied by numerical simulation. The penetration of metal plate by linear shaped charge jet has also been simulated. Through the numerical analysis, the forming characteristics of linear shaped charge jet, the time history of cutting width and penetrated depth of metal plate are obtained. The regularity of the formation and subsequent penetration process of linear shaped charge jet with different liner obtained in this paper can provide references for the design of linear shaped charge jet.