摘要
基于动力学、温度-位移关系和几何非线性原理,采用Johnson-Cook本构模型构建起高速子弹撞击Ti6Al4V数值分析模型,研究了不同速度下子弹着靶时剩余速度的变化及靶板的温升特性及靶板的瞬态应力变化规律进行了分析;分析了距离撞击点不同位置的应力变化规律及碰撞时上下表面的应力变化情况,并分析了子弹撞击Ti6Al4V合金板过程中的冲击能量突变过程。结果表明:通过对比不同速度子弹侵彻Ti6Al4V的数值分析模型,得出子弹初速度大小是影响侵彻过程中各参数变化的重要因素;随着初速度的增大,其碰撞时间减小且剩余速度随初速度的变化规律近似线性递增;碰撞过程中子弹动能转化为整体内能使温度上升,碰撞区域温度随速度增大而增大;瞬态应力的大小及传递速度随子弹速度变化而改变,速度越大,碰撞中心弹性和塑性变形越剧烈,应力值越大。
Based on the principle of dynamics,temperature-displacement relationship and geometric nonlinearity,the Johnson-Cook constitutive model was used to construct the numerical analysis model of high-speed bullet impact on Ti6Al4V.The change of residual velocity and the temperature rise characteristics of the target plate at different velocities were studied,and the transient stress variation law of the target plate was analyzed.The stress variation law at different positions from the impact point and the stress changes on the upper and lower surfaces during the collision were explored,and the impact energy mutation process during the bullet impact on the Ti6Al4V alloy plate was analyzed.The numerical analysis results show that by comparing the numerical analysis models of bullets penetrating Ti6Al4 V at different speeds,it is concluded that the initial velocity of bullets is an important factor affecting the changes of various parameters in the penetration process.With the increase of the initial velocity,the collision time decreases and the residual velocity increases linearly with the initial velocity.During the collision process,the kinetic energy of the bullet is converted into the overall internal energy to increase the temperature,and the temperature in the collision area increases with the increase of velocity.The magnitude and transmission speed of transient stress change with the change of bullet speed.The greater the speed,the more severe the elastic and plastic deformation of the collision center,and the greater the stress value.
作者
刘元朋
刘文广
曾光
王正鹤
刘顺新
LIU Yuanpeng;LIU Wenguang;ZENG Guang;WANG Zhenghe;LIU Shunxin(School of Mechanical Engineering,Zhengzhou University of Aeronautics,Zhengzhou 450015,China)
出处
《兵器装备工程学报》
CAS
CSCD
北大核心
2024年第8期129-134,共6页
Journal of Ordnance Equipment Engineering
基金
河南省科技攻关项目(222102240017,232102241030)
河南省高等学校重点项目(23B460001)
郑州航院研究生教育创新计划基金项目(2024CX80,2024CX81)
郑州航院实验室开放项目(ZHSK24-54,ZHSK24-55)。
关键词
Ti6A4V合金
子弹
速度
温升特性
瞬态应力
Ti6A4V alloy
bullet
speed
temperature rise characteristics
transient stress
energy
