Analyses of Measurement Errors of Shear Bands with Constant Strains Based on the One-and Two-order DIC Methods
DU Ya-zhi1,WANG Xue-bin1,2,DONG Wei1,FENG Wei-wu1,HOU Wen-teng1
1. College of Mechanics and Engineering, Liaoning Technical University, Fuxin, Liaoning 123000, China
2. Institute of Computational Mechanics, Liaoning Technical University, Fuxin, Liaoning 123000, China
Abstract The horizontal and oblique shear band with constant strains are produced, using the digital image correlation (DIC) method, the displacement field and strain field of the inside and outside the shear band were measured, the influences of the shape function, subset size and spacing of points on displacement were analyzed. The results showed that the displacement error limits of the one-or two-order DIC methods are high nearby the boundary of a shear band, because a subset covers a part of a shear band. The larger the subset size is or the shorter the distance from the subset center to the boundary of a shear band is, the higher the displacement error limit is. Usually, the displacement error limits of the two-order DIC method are much lower than those of the one-order DIC method nearby the boundary of a shear band. With the increase of the spacing of points, the shear strain-coordinate curves of the shear band in the normal direction of one- or two-order DIC methods change from steep to gentle, and widths of shear bands increase.
DU Ya-zhi,WANG Xue-bin,DONG Wei, et al. Analyses of Measurement Errors of Shear Bands with Constant Strains Based on the One-and Two-order DIC Methods[J]. Acta Metrologica Sinica, 2018, 39(1): 66-71.
2018, Vol. 39 
