摘要
为了解TC4钛合金的抗冲击力学性能,利用一级轻气炮进行了卵形头弹冲击TC4钛合金靶板的试验,撞击速度范围为125.9~240.0 m/s。通过撞击试验获得弹体的初始剩余速度以及靶板的失效破坏模式,并利用公式拟合弹体初始剩余速度得到弹道极限速度。利用ABAQUS/Explicit有限元软件建立弹体冲击靶体的三维模型,研究断裂准则对TC4钛合金板抗卵形头弹冲击性能的影响,分别采用不同断裂准则进行数值模拟,并将数值模拟预测结果与试验结果进行对比。研究结果表明,从弹道极限和失效破坏模式综合考虑,Hancock-Mackenzie(H-M)准则预测的结果与试验结果更接近,说明考虑失效应变随应力三轴度的变化关系能提高数值仿真精度。
In order to understand the impact resistance mechanics properties of TC4 titanium alloy,a one-stage light gas gun was used to launch the ogival-nosed projectiles on the plates of TC4 titanium alloy,while the impact velocity ranged from 125.9 m/s to240 m/s.The initial-residual velocities of projectiles and the failure mode of plates were obtained by impact test,and the ballistic limit velocity was obtained by fitting the initial-residual velocity of the projectiles with the formula.3D models of projectile impact targets were established by using ABAQUS/Explicit finite element software.In order to study the effects of fracture criterions on the TC4 titanium alloy plates against the impacts of ogival-nosed projectiles,the different fracture criterions were used for numerical simulation,and the numerical prediction results were compared with the experimental ones.The results show that the predicted results of Hancock-Mackenzie(H-M)criterion are more close to the test ones from the comprehensive consideration of ballistic limit velocity and failure modes,which indicates that the numerical prediction results maybe improved by accurately considering the relationship between failure strain and stress triaxiality.
作者
邓云飞
张永
张伟岐
徐美健
王陆军
DENG Yunfei;ZHANG Yong;ZHANG Weiqi;XU Meijian;WANG Lujun(College of Aeronautical Engineering,Civil Aviation University of China,Tianjin,300300)
出处
《中国机械工程》
EI
CAS
CSCD
北大核心
2019年第19期2378-2384,共7页
China Mechanical Engineering
基金
国家自然科学基金资助项目(11702317)
中央高校基本科研业务费专项资金资助项目(3122018D037)
关键词
弹体
靶体
弹道极限
失效模式
断裂准则
projectile
target
ballistic limit
failure mode
fracture criterion
作者简介
邓云飞,男,1982年生,副教授。研究方向为材料与结构动态力学性能。E-mail:yfdeng@cauc.edu.cn。
