聚能射流长靶距下的侵彻仿真模型

提出了一个用于长靶距下聚能装药的断裂射流侵彻能力预测数值仿真模型.因聚能射流有很大的速度梯度,当它飞行数倍于标准炸高的距离后,射流被拉断为碎段,其穿甲能力大为降低.基于非线性瞬态动力学程序AUTODYN,研究了聚能装药射流的形成和大靶距下的断裂射流对不同靶体的侵彻和贯穿模拟.通过与实验结果比较,给出了一个用于预测长靶距下聚能装药射流侵彻能力的计算模型.与实验数据比较,所给模型可给出准确的预测结果.

Computational model for the penetration simulation ofshaped charges fired at large standoff

Shaped charges are a type of very powerful and useful warheads to penetrate and perforate armors and protective structures, as the metal, jets formed by the detonation of the shaped charge possess a hyper velocity. However, the jet of a shaped charge will break up to pieces after the jet has traveled a long distance in terms of its charge diameter, since the velocity gradient is also very high along the jet. As a resuit, the penetration capacity of the broken jets decreases considerably. The penetration and perforation capability of the the shaped charge jets fired at the standard standoff has been studied extensively. But only very limited information on the penetration performance of the shaped charges fired at large standoff is available in the open literature so far. By using the hydrocode AUTODYN, the formation of shaped charge jet and the geometry and velocity profile of the jet traveling a large standoff were simulated, then the penetration performance of the broken jets on different types of targets were studied both experimentally and numerically. By comparing the simulation results with the experimental data, an effective computational model was proposed for the penetration and perforation simulation of shaped charges fired at large standoff. The living firing tests show that the proposed model can yield good penetration prediction.