微尺度塑性大应变测量  

The determination of plastic strain in microscale

作　　者：安兵兵[1] 吴佳[1] 张俊乾[1] 张东升[1] 

机构地区：[1]上海大学力学系

出　　处：《实验技术与管理》2010年第3期32-35,38,共5页Experimental Technology and Management

基　　金：国家自然科学基金(10772111);上海大学力学实验室建设经费资助

摘　　要：该文采用数字图像相关法对微尺度试件的大变形进行了测定。通过位移搜索方式,首先获得全场的位移信息,再借助最小二乘法原理,对图像中各子区域的位移进行曲面多项式拟合,应变场则由其一阶导数获得。采用自行研制的材料/结构力学性能微尺度测试系统,对带预制裂纹的铝箔在拉伸情况下裂纹附近的变形场和不锈钢片的滑移使得塑性变形场进行了测试。This article describes the way to determine strain localization with the help of digital image correlation method in microscale.The displacement in full field could be obtained by analyzing the deformed and undeformed images,after that,its distribution was smoothed by least square method,and the strain distribution was obtained with the first derivation.With the material/structure mechanical testing system and the former method,the characteristics of the strain field of aluminum sheets with an initial crack and the creep effect of stainless steel sheets were analyzed.

关 键 词：数字图像相关 应变场 薄膜 微尺度 最小二乘法 

分 类 号：TH822[机械工程—仪器科学与技术]