马赫杆加载下无氧铜的动态破碎  

Dynamic fragmentation of oxygen-free high-conducting copper under Mach stem loading

作　　者：叶川兵 段志伟 李绪海[1] 王曦 潘昊[2] 俞宇颖[1] 胡建波[1] YE Chuanbing;DUAN Zhiwei;LI Xuhai;WANG Xi;PAN Hao;YU Yuying;HU Jianbo(National Key Laboratory for Shock Wave and Detonation Physics,Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621999,Sichuan,China;Institute of Applied Physics and Computational Mathematics,Beijing 100094,China)

机构地区：[1]中国工程物理研究院流体物理研究所冲击波物理与爆轰物理全国重点实验室,四川绵阳621999 [2]北京应用物理与计算数学研究所,北京100094

出　　处：《爆炸与冲击》2023年第11期65-72,共8页Explosion and Shock Waves

基　　金：国家自然科学基金(12072331)。

摘　　要：为了深入了解金属材料在复杂加载下的动态破碎行为,在有限元模拟的基础上,设计了两类马赫杆加载实验,用于研究无氧铜在复杂加载下的动态破碎行为。实验中,采用火炮加载马赫透镜和激光粒子速度干涉仪测量自由面速度,实现了峰值压力分别为95.75和32.38 GPa的动态加载。结果表明,实验中成功实现了稳定的马赫杆加载,并且观察到马赫杆加载下无氧铜的2种不同近表面破碎模式,即高压下产生微层裂、低压下产生三角波层裂,且层裂区呈凸形分布。To in-depth understand the dynamic fracture behaviors of metal materials under complex loading,based on the finite element simulation,two types of Mach stem loading experiments were designed and carried out to investigate the dynamic fragmentation of oxygen-free high-conducting copper(OFHC Cu)under complex loading.In the experiments,a powder gun was used to impact the Mach lens,and a laser particle-velocity interferometer was applied to measure the free surface velocity.And dynamic loadings with the peak pressures of 95.75 and 32.38 GPa,respectively,were achieved.Stable Mach stem loading was successfully generated,and the Mach stem-related features were consistent with the simulated ones.At the same time,two different near-surface fracture behaviors in the OFHC Cu were observed,namely the micro-spallation under high pressure and the triangular-wave spallation under low pressure,with the cracked area distributed in a convex shape.These findings have a certain value for further understanding the dynamic fracture behaviors of metal materials and can provide new experimental methods for understanding material failure under various complex loading conditions.

关 键 词：马赫杆 微层裂 无氧铜 动态破碎 

分 类 号：O383[理学—流体力学]