【作者】 张秀华； 张达；

【Author】 ZHANG Xiu-hua;ZHANG Da;Jiangsu Key Laboratory of Structural Engineering;School of Civil Engineering, Northeast Forestry University;

【机构】 江苏省结构工程重点实验室； 东北林业大学土木工程学院；

【摘要】 利用ANSYS/LS-DYNA动力分析软件,基于Euler算法分析TNT炸药爆炸冲击波在空气中的传播规律,并将结果与经典的经验公式进行比较,分析单元网格尺寸效应对数值模拟结果的影响,并给出合理划分网格的建议。利用ANSYS建立有限元建模,炸药及空气采用欧拉网格,采用多物质ALE算法。数值分析表明:在比例距离相同时,对小当量的炸药采用小网格尺寸可以满足精度要求,大当量的炸药采用大网格尺寸可以满足精度要求。给出了形式简单、便于应用立方体装药TNT炸药在自由空中爆炸空气冲击波超压的计算公式。更多还原

【Abstract】 Using ANSYS/LS-DYNA dynamic analysis software based on Euler algorithm to analyze TNT dynamite explosion shock wave propagation law in air. The results of numerical simulations are compared with the classic experience formula. The unit grid size effect on the result of numerical simulation is analyzed, and the reasonable grid division is given. The finite element modeling is built using ANSYS, TNT dynamite and air using Euler grid. The multi-material Euler algorithm is adopted. The analysis results show that when scale distance is same, the small equivalent explosive can meet the requirement of precision using small size grid, and the large equivalent explosive can meet the requirement of precision using large grid size. The simple form and easy application blast shock wave overpressure calculation formula of cube charge TNT dynamite under free air blast is proposed.更多还原