高级搜索

您是今天第:607位访问者

您是第:7839013位访问者

两种算法模拟炸药撞击响应特性的对比分析
Comparative Analysis of Two Algorithms for Simulating the Impact Response Characteristics of Explosives
  • 摘要
  •  
  • 参考文献
  •  
  • 引证文献
  •  
  • 相似文献
中文摘要:
      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。
中文关键词: 炸药  撞击响应  数值模拟  FEM-SPH耦合算法
英文摘要:
      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.
英文关键词: explosive  impact response  numerical simulation  FEM-SPH coupling algorithm
DOI:10.11943/j.issn.1006-9941.2018.03.006
投稿日期:2017-06-27
最后修改日期:2017-08-07
网络出版日期:2018-03-13
书版出版日期:2018-03-21
基金项目:国防预研基金项目(402070207)
引用文献: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
作者单位E-mail
章猛华 南京理工大学 能源与动力工程学院,江苏 南京 210094 zmhalt@163.com,ruanwj@njust.edu.cn 
阮文俊 南京理工大学 能源与动力工程学院,江苏 南京 210094 ruanwj@njust.edu.cn 
余永刚 南京理工大学 能源与动力工程学院,江苏 南京 210094  
摘要点击次数: 902
全文下载次数: 539
HTML  查看全文   查看/发表评论   下载PDF阅读器

更多>>

更多>>

分享按钮