SPH方法在宽速域岩石侵彻问题中的应用  

Application of SPH Method for Problem of Rock Penetration within the Wide-Ranged Velocity

作　　者：强洪夫 张国星 王广 黄拳章 QIANG Hongfu;ZHANG Guoxing;WANG Guang;HUANG Quanzhang(Rocket Force University of Engineering,Xi’an 710025,China)

机构地区：[1]火箭军工程大学

出　　处：《高压物理学报》2019年第5期172-180,共9页Chinese Journal of High Pressure Physics

基　　金：国家自然科学基金(51276192)

摘　　要：采用光滑粒子流体动力学(SPH)方法对花岗岩靶板受碰撞侵彻的大应变、高应变率变形问题进行了数值模拟。为了描述弹目材料的非线性变形及破坏特性,对花岗岩靶板引入了Holmquist-Johnson-Cook(HJC)本构模型及损伤模型,对弹体引入含损伤的Johnson-Cook(J-C)本构方程和Grüneisen状态方程,靶板与弹体均离散成拉格朗日粒子。通过自编程序仿真计算0~4 m/s的着靶速度下花岗岩靶板的三维侵彻过程,对比分析了钢珠在不同弹体条件下的侵彻结果,在固体侵彻、半流体侵彻和流体侵彻的区域内拟合了侵彻深度随着靶速度的变化曲线。数值计算结果显示,侵彻深度随着靶速度的增加在固体侵彻区间(v0<1421 m=s)呈现递增趋势,在半流体侵彻区间(1421 m=s≤v0≤1700 m=s)呈现递减趋势,在流体侵彻区间(v0>1700 m=s)呈现递增趋势并逐渐趋于平滑,达到峰值。The smoothed particle hydrodynamics(SPH)method is used to simulate the deformation of penetration of granite at large strain and high strain rates.In order to describe the nonlinear deformation and failure characteristics of the projectile and target,the Holmquist-Johnson-Cook(HJC)constitutive model,damage model,Johnson-Cook(J-C)constitutive model and Grüneisen equation of state for granite are introduced,in which the projectile and the fortifications are discretized into Lagrangian particles.In simulation of three-dimensional penetration process of granite targets by self-made program at the speed from 0 m/s to 4000 m/s,we compare and analyzes the penetration results of steel balls under different projectile conditions.The curve of the penetration depth with the penetration velocity is fitted in solid penetration,semi-fluid penetration and fluid invasion.The numerical results show that the penetration depth increases with the increase of the penetration velocity in the solid penetration interval(v0<1421 m=s).A decreasing trend is shown in the semi-fluid penetration interval(1421 m=s≤v0≤1700 m=s),while an increasing trend is shown in the fluid penetration interval(1421 m=s<v0<1700 m=s)and gradually tended to reach the peak.

关 键 词：弹体 侵彻 花岗岩 光滑粒子流体动力学方法 

分 类 号：O313.4[理学—一般力学与力学基础]