混凝土中爆炸数值仿真算法研究  

Study on numerical simulation method of explosion in concrete

作　　者：杨冬梅[1] 王晓鸣[1] 

机构地区：[1]南京理工大学机械工程学院,江苏南京210094

出　　处：《爆炸与冲击》2005年第6期569-573,共5页Explosion and Shock Waves

摘　　要：用AUTODYN动力学软件对装药在混凝土介质靶中爆炸作数值仿真,研究了不同的网格描述方法,以及网格划分方法对计算结果的影响。通过实际算例比较了Lagrange算法和SPH算法以及不同的网格划分细度对靶径向、轴向不同距离的最大冲击压力、靶背过载以及损伤区、炸坑大小的模拟计算结果。分析得到了混凝土介质靶中爆炸问题数值仿真的合适算法,即拉氏算法对炸点近处的较高的最大冲击压力有较好的敏感能力,SPH算法对仿真计算爆坑形态以及抛掷体速度等具有明显的优势。对于算例问题,拉氏算法10mm网格和SPH算法3 mm粒子即可满足一定的计算精度。The numerical simulation of explosion in concrete with the hydro-code AUTODYN-2D has been presented. The effects on different method and different mesh size in numerical simulation are studied. With the detail example, the maximum shock pressure of concrete target in radial and axial, overload acceleration of back of target and size of damage section, size of blast pit are computed with Lagrange method and SPH method, which have different mesh size. The simulation results are compared with each other and with experiment results, and the proper simulation method and mesh size are demonstrated to the problem of explosion in concrete medium. Lagrange method is adaptable to simulation the maximum shock pressure of concrete target, especially to the area near the explosive point. SPH method has merit to simulate the shape of blast pit and the throw speed of the break. And 10 mm mesh size to Lagrange method and 3 mm particle size to SPH method are suitable to the example problem.

关 键 词：爆炸力学 SPH法 数值仿真 混凝土 Lagrange法 

分 类 号：O382[理学—流体力学]