铝球超高速撞击防护屏的数值模拟研究

应用光滑粒子流体动力学(SPH)方法对铝球弹丸正撞击防护屏进行了数值模拟研究,将计算结果同相应的实验结果进行了比较,二者符合得很好.说明SPH方法能够较好地处理超高速撞击问题,同时也验证了数值模拟方法的正确性及有效性.在此基础上分析了撞击速度、防护屏厚度、铝球直径、材料强度模型等因素对防护屏穿孔直径和碎片云长径比的影响规律,并以防护屏穿孔直径和碎片云长径比为指标,应用正交设计方法分析研究了撞击速度、防护屏厚度、铝球直径3因素对指标的影响主次关系.研究表明:铝球直径是影响防护屏穿孔直径的主要因素,防护屏厚度是影响碎片云长径比的主要因素.

Numerical Simulation of Hypervelocity Impact of Al-spheres on Bumper

The numerical simulations of hypervelocity impact of Al-spheres on bumper at normal are carried out using the SPH(smoothed particle hydrodynamics)technique of AUTODYN-2D hydro-codes in this paper.The simulation results are compared with experimental results,and the simulated hole diameters of bumper are consistent well with experimental results.So the problem of hypervelocity impact can be dealed well with SPH technique.The correctness and validity of numerical simulation are also validated.The effect of impact velocity,bumper thickness,projectile diameter and intensity models of materials on hole diameter of bumper and length-to-diameter ratio of debris cloud are analyzed.Regarding the hole diameter and length-to-diameter ratio of debris cloud as index on this basis,orthogonal design method is applied to analyze the primary and secondary relations on the index of the three factors,which are impact velocity,bumper thickness and projectile diameter.The analysis results indicate that the major factors which influence the hole diameter of bumper and length-to-diameter ratio of debris cloud are projectile diameter and bumper thickness respectively.