复合杆体侵彻半无限靶的数值模拟分析

Numerical Simulation Analysis of Jacketed Rod Penetration into Semi-Infinite Target

基于ANSYS/LS-DYNA软件对复合杆体在不同弹芯长径比、弹芯截面积形状、弹芯和护套材料参数情况下垂直侵彻半无限靶进行了三维数值模拟研究,找到了相关物理量对侵彻效果的影响规律,并通过进一步建立弹坑简化模型,分析了复合杆体的侵彻机理。结果表明:在保证侵彻过程中弹芯不弯曲变形的前提下,尽量提高弹芯长径比和着靶速度能有效提高侵彻效果;圆形弹芯截面侵彻效果相对于正方形和三角形弹芯截面的复合杆体更为稳定;在满足内外弹道强度要求的前提条件下,采用密度较高的弹芯材料、密度和杨氏模量较低的护套材料可以明显提高复合杆体的侵彻效果;复合杆体的长径比和材料类型会对不同侵彻阶段穿深与弹坑总穿深之比产生影响。

Based on ANSYS/LS-DYNA software, the three-dimensional numerical simulation of the jacketed rod body vertically penetrating the semi-infinite target were investigated with the different aspect ratios of the core, the cross-sectional shape of the core, and the material parameters of the core and the jacket. The influence law of the related physical parameters on the penetration effect was obtained by comparisons. The penetration mechanism of the jacketed rod was analyzed based on the crater model. The results show that the aspect ratios and the target speed of the core can be increased as much as possible to effectively improve the penetration effect on the assumption of structural integrity. The circular core cross-section penetration effect is more stable than the square and triangular core cross-section jackted rods. Under the requirements of internal and external ballistic strength, the high-density core material, the sheath material with lower density and Young’s modulus can significantly improve the penetration effect of the jacketed rod. The aspect ratio and material parameters of the jacketed rod have an effect on the penetration depth of the different penetration stages in the total penetration of the crater.