冲击荷载下金属-玻璃界面的动态故障

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Impact Engineering Pub Date : 2024-10-19 DOI:10.1016/j.ijimpeng.2024.105136
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引用次数: 0

摘要

为了研究金属的动态断裂行为,在临界速度范围内(即从 70 米/秒到 210 米/秒),用气枪装置加速三个金属球(如钢球、高纯钨球和高纯铅球)撞击玻璃球。任何反射器的速度干涉仪系统(VISAR)装置用于测量玻璃球背面的粒子速度,并利用高速照片捕捉金属-玻璃界面的破坏过程。由于在剧烈破坏过程中应力场和应变场的演变不同步,结果表明破坏机制与分体式霍普金森压力棒(SHPB)撞击破坏机制截然不同。玻璃球的碎裂主要是由径向裂纹和金属-玻璃界面周围以及球体边缘的横向裂纹引起的,且随着冲击速度的增加而增加。三种金属撞击器的动态失效表现出不同的模式,例如钢撞击器的拉伸断裂、钨撞击器的剪切断裂和铅撞击器的压缩屈服。根据实验结果和离散元法(DEM)的数值结果,引入应变能释放转移来描述金属-玻璃界面的破坏行为,并建立了应变能释放的弛豫扩散方程。讨论了金属-玻璃界面失效的演变过程。在尺寸分析的基础上,进一步研究描述了钨冲击器和钢冲击器的动态断裂,并获得了这些应变速率依赖性金属冲击器断裂应变和裂纹宽度的定量表达式。这些结果有助于深刻理解金属结构的动态断裂以及脆性材料在承受冲击载荷时的动态碎裂。
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Dynamic failures at the metal-glass interface under impact loading
To investigate dynamic fracture behavior in the metal, three metal spheres (e.g., steel sphere, high purity tungsten sphere, and high purity lead sphere) are accelerated by the gas gun devices to impact glass spheres under the critical speed range (i.e., from 70 m/s to 210 m/s). The velocity interferometer system for any reflector (VISAR) devices are employed to measure the particle velocities at the back surface of glass sphere, and high-speed photographs are utilized to capture the failure process at the metal-glass interface. Due to the asynchronous evolutions of stress fields and strain fields in the violent failure process, the results illustrate quite different failure mechanisms from those by the Split Hopkinson Pressure Bar (SHPB) impacting. Fragmentations of the glass sphere are caused mainly by the radial cracks and the lateral cracks around the metal-glass interface and the edges of the sphere with increasing impact velocity. Dynamic failures in the three metal impactors exhibit different modes, e.g., tensile fracture in the steel impactor, shear fracture in the tungsten impactor, and compressed yielding in the lead impactor. The transferring of strain energy releasing is introduced to describe the failure behavior at the metal-glass interface, and a relaxation-diffusion equation of strain energy releasing is then established based on the experimental results and the numeric results by the discrete element method (DEM). The evolutions of failures at the metal-glass interface are discussed. Further investigation is conducted to describe the dynamic fractures in tungsten impactors and steel impactors based on the dimensional analyses, and the quantitative expressions of these strain rate dependent fracture strains and crack width in the metal impactors are obtained. The results are helpful for the profound understanding of the dynamic fracture in the metal structures and the dynamic fragmentations in the brittle material when subjected to impact loading.
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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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