脉冲应力冲击下30CrMnMo钢的绝热剪切失效行为  

Adiabatic Shear Failure Behavior of 30CrMnMo Steel under Pulse Stress Impact

作　　者：程昊 王猛[1] 李想 曲禹同 吴海龙 刘子禛 李博 CHENG Hao;WANG Meng;LI Xiang;QU Yutong;WU Hailong;LIU Zizhen;LI Bo(School of Equipment Engineering,Shenyang Ligong University,Shenyang 110159,Liaoning,China;China Ordnance Industry Testing and Research Institute,Huayin 714200,Shaanxi,China)

机构地区：[1]沈阳理工大学装备工程学院,辽宁沈阳110159 [2]中国兵器工业试验测试研究院,陕西华阴714200

出　　处：《高压物理学报》2024年第4期70-78,共9页Chinese Journal of High Pressure Physics

基　　金：辽宁省教育厅科学研究经费项目(LG202013)。

摘　　要：为研究30CrMnMo钢在脉冲应力冲击载荷下的绝热剪切失效及演化特性,利用分离式霍普金森压杆对一种轴对称帽型试件进行冲击剪切实验,并运用LS-DYNA动力学有限元软件对不同入射脉冲应力载荷下的剪切失效演化及剪切区温度分布进行数值模拟。结果表明,帽型试件的绝热剪切失效与脉冲应力比冲量相关,对于30CrMnMo钢帽型试件,其绝热剪切失效对应的脉冲应力比冲量近似为常量。数值模拟中,当网格尺寸小于剪切带宽度时,能够有效模拟剪切带内的局部温升热点特性。绝热剪切演化表现为失稳由帽型试件剪切区拐角处启动并同时向中心传播,剪切带内外材料主要经历均匀剪切变形和失稳快速扩展2个阶段。In order to study the adiabatic shear failure behavior and evolution characteristics of 30CrMnMo steel under pulse stress impact,a split Hopkinson pressure bar was used to conduct an axisymmetric cap shaped specimen for impact shear experiments.The shear failure evolution and temperature distribution in the shear zone under different incident pulse stress loads were numerically simulated using LS-DYNA dynamic finite element software.The results indicate that the adiabatic shear failure of the cap shaped specimen is related to the specific impulse of the pulse stress.For cap shaped specimen of 30CrMnMo steel,the specific impulse of pulse stress corresponding to the adiabatic shear failure is approximately constant.In numerical simulation,when the grid size is smaller than the width of the shear band,the local temperature rise of hot spot within the shear band can be effectively simulated.The evolution of adiabatic shear instability is characterized by simultaneous propagation from the corner of the shear zone to the center,and the materials inside and outside the shear zone mainly undergo two stages:uniform shear deformation and rapid expansion of instability.

关 键 词：绝热剪切 脉冲应力 轴对称帽型试件 温度场分布 30CrMnMo钢 

分 类 号：O347[理学—固体力学] TG146[理学—力学]