Dynamic Failure Mode Selection in Rate Sensitive Metal Alloys

速率敏感金属合金的动态失效模式选择

• 批准号: 9204026
• 负责人: Ares Rosakis
• 金额: $ 21万
• 依托单位: California Institute of Technology
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-09-15 至 1996-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9204026&HistoricalAwards=false
• 关键词: Dynamic; Failure; Mode; Selection; Rate

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.

本研究的目的是研究控制速率敏感金属合金动态本构行为和破坏行为的物理现象。研制了一种轴向/扭转组合分离式Hopkinson杆，用于研究这类合金在多轴动态载荷作用下的热机械本构行为和局部化行为。重点研究与预切口板试件的非对称冲击载荷相关的失效模式转变现象(动态开裂和动态剪切带)。各种高速光学和热成像诊断技术将同时用于记录变形、局部化和故障过程中的力学和温度场。