遮光法测量铝薄板高压加载下的动态特征量  

Dynamic characteristics of thin aluminum under high pressure loading measured by shading principle

作　　者：袁蓓[1] 姚红兵[1] 张永康[1] 佟艳群[1] 孟春梅[1] 

机构地区：[1]江苏大学江苏省光子制造科学与技术重点实验室,镇江212013

出　　处：《激光技术》2011年第1期19-21,125,共4页Laser Technology

基　　金：国家自然科学基金资助项目(50735001;10804037);中国博士后科学基金特别资助项目(200902506);中国博士后科学基金资助项目(2007041 1022);江苏省博士后基金资助项目(0701007B);江苏省2009年度普通高校研究生科研创新计划资助项目(CX09B_190Z)

摘　　要：为了检测强脉冲激光冲击加载材料发生的动态变化,采用遮光原理设计了一种新的检测仪器,能较为准确地检测出在冲击过程中试样的动态特征量。结果表明,铝薄板(L2)在激光冲击成形过程中弹性变形和塑性变形同时存在,塑性变形的时间远远大于弹性变形。试样中心区域在弹性变形阶段的平均变形速率为3.2×10~3m/s,试样的平均应变率为8.9 × 10~4s^(-1)。该结果为相关激光冲击成形技术发展提供了实验依据。In order to measure dynamic characteristics of a specimen in the laser shock forming laser shock forming accurately, a new experimental device was designed to detect the dynamic change of the loaded material based on shading principle. The experimental results indicate that elastic deformation and plastic deformation of 1060 thin aluminum coexist during the process of laser shock forming, and the existence of plastic deformation period is far longer than the elastic deformation. Based on the experiment, it can be calculated that the average speed of elastic deformation and average strain rate of the sample in central area are 3.2×10^3m/s and 8.9×10^4s^-1 respectively. The results provide the experimental evidence for the development of relevant laser shock forming technology.

关 键 词：激光技术 激光冲击成形 遮光原理 变形速度 应变率 

分 类 号：TN249[电子电信—物理电子学]