Dynamic Failure Mode Selection in Rate Sensitive Metal Alloys

这项研究的目的是研究物理现象 控制材料的动态本构和破坏行为 敏感金属合金 轴向/扭转组合裂缝 霍普金森杆将被开发和用于研究 热机械本构和局部化行为， 合金，当它们受到多轴动态载荷。 重点将放在检查失败的现象 模式转换（动态开裂与动态剪切带） 与预切口板的非对称冲击载荷相关 标本 各种高速光学和热成像 诊断技术将同时用于记录 变形过程中的机械和温度场， 定位与失败

The purpose of this research is to study the physical phenomena controlling the dynamic constitutive and failure behavior of rate sensitive metals alloys. A combined axial/torsional split Hopkinson bar will be developed and used to investigate the thermomechanical constitutive and localization behavior of such alloys when they are subjected to multi-axial dynamic loading. Emphasis will be placed on examining the phenomenon of failure mode transition (dynamic cracking vs. dynamic shear banding) associated with asymmetric impact loading of pre-notched plate specimens. A variety of high speed optical and thermographic diagnostic techniques will be used simultaneously to record mechanical and temperature fields during deformation, localization and failure.