Improved Digital Image Correlation Method for Eliminating Pixel Shape-Induced Errors in Shear-Strain Calculations
Improved Digital Image Correlation Method for Eliminating Pixel Shape-Induced Errors in Shear-Strain Calculations
复制标题
DOI：
10.1520/jte20120085
复制
发表时间：
2013-01
影响因子：
1.2
通讯作者：
B. Peng;Chengcheng Huang;Wu Zhou;Huijun Yu;Z. Zeng
中科院分区：
文献类型：
--
作者：
B. Peng;Chengcheng Huang;Wu Zhou;Huijun Yu;Z. Zeng
Digital image correlation is widely used in non-contact displacement/strain measurements for numerous engineering applications. Under rigid body rotation or shear deformation, however, the calculated surface strain of specimens is unreliable when camera pixels are characterized by non-square geometry, that is, the width-to-height ratio of pixels is not 1. This study analyzes the computational errors introduced by cameras, and proposes a modified least-squares method that eliminates such errors when the strain field is calculated. Experimental results confirm that the algorithm validly and effectively computes shear strain.
