药型罩网格数量对数值模拟精度的影响

Influence of Mesh Number of Liner on Numerical Simulation Accuracy

为研究药型罩壁厚网格数量对某大口径破甲战斗部数值模拟可信度的影响,应用非线性动力学有限元软件AUTODYN,对口径为140 mm的单锥罩射流形成及侵彻1 000 mm厚钢靶的过程进行数值模拟,并开展静破甲试验。通过将药型罩壁厚的网格数划分为5种方案分别计算,考察网格数对单锥罩射流形成及侵彻的影响规律。结果表明:网格数量较少时,射流提前断裂,侵彻深度较低,且与试验差距较大;当药型罩壁厚的网格划分数为n=6、7时,与试验结果最吻合。

In order to study the influence of liner thickness and grid number on the reliability of numerical simulation of a big bore shaped charge warhead, the nonlinear dynamic finite element software AUTODYN was used to simulate the process of single-cone liner jet formation and penetration into 1 000 mm thick steel target with an aperture of 140 mm, and the static penetration test was carried out. By dividing the grid number of liner wall thickness into five schemes, the influence of grid number on the formation and penetration of single-cone liner jet was investigated.The results show that when the grid number is small, the jet breaks in advance and the penetration depth is low, and there is a big gap with the experiment;when the grid number of liner wall thickness is n = 6 and 7, the results are most consistent with the experiment results.