(南京理工大学 能源与动力工程学院,江苏 南京 210094)
章猛华(1990-),男,博士研究生,主要从事终点效应及高效毁伤研究。e-mail: email@example.com 通信联系人: 阮文俊(1964-),男,教授,主要从事武器系统总体研究。e-mail: firstname.lastname@example.org
(School of Energy and Power Engineering,Nanjing University of Science and Technology,Nanjing 210094, China)
为了更有效地模拟炸药的撞击响应特性, 为炸药的安全性预测提供可靠数据, 采用有限元法(FEM)及FEM与光滑粒子(FEM-SPH)耦合算法分别对炸药的跌落试验及Steven试验进行了数值模拟, 对各种算法的优缺点进行了讨论及对比分析。结果表明, FEM-SPH耦合算法能够更有效地模拟粘性炸药受撞后的力学响应问题, 且精度更高。在跌落试验的模拟中, FEM-SPH耦合算法得到的压力及过载曲线的上升速率与实测值更接近, 最大压力误差约4%, 而FEM的误差为16%；在Steven试验的模拟中, FEM-SPH耦合算法得到的压力时程曲线与试验值更吻合, 压力积分值与试验值偏差约10.7%, 而FEM的偏差为29%, 炸药受撞击后的现象也与试验较相似。FEM-SPH耦合算法能够在一定程度上表现出粘性及颗粒材料在撞击加载过程中的相对滑移及流动特性, 对于模拟粘性炸药在受撞击后产生大变形的问题有一定优势。
To simulate the impact response characteristics effectively and provide reliable data for the safety prediction of explosives, the numerical simulations of the drop test and the Steven test of explosive were performed by the finite element method (FEM) and the coupling algorithm of FEM and smoothed particale hydrodynamics (FEM-SPH) and the discussion and comparative analysis for the advantages and disadvantages of all kinds of algorithms were carried out. Results show that the FEM-SPH coupling algorithm can more effectively simulate the mechanical response problem of viscous explosives after being impacted and the accuracy is higher. In the simulation of drop test, the ascending rates of pressure curve and overloading curve obtained by FEM-SPH coupling algorithm are closer to the measured values. The maximum pressure error is approximately 4%, while the error of FEM is 16%. In the simulation of Steven test, the pressure history curve obtained by FEM-SPH coupling algorithm is more consistent with the testing value. The deviation of the pressure integral value and the experimental value is approximately 10.7%, whereas the deviation of FEM is 29%, and the phenomenon after being impacted is more similar to real test situation. FEM-SPH coupling algorithm can show the relative slippage and flow characteristic of viscous materials and granular ones in the process of impact loading in a certain degree, the problems of simulating large deformation of viscous explosives after being impacted have certain advantages.
章猛华,阮文俊,余永刚.两种算法模拟炸药撞击响应特性的对比分析[J].含能材料, 2018, 26(3):237-242. DOI:10.11943/j. issn.1006-9941.2018.03.006.
ZHANG Meng-hua, RUAN Wen-jun, YU Yong-gang. Comparative Analysis of Two Algorithms for Simulating the Impact Response Characteristics of Explosives[J]. Chinese Journal of Energetic Materials, 2018, 26(3):237-242. DOI:10.11943/j. issn.1006-9941.2018.03.006.