|
|
|
| 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.
|
|
Received: 11 July 2016
Published: 29 December 2017
|
|
|
|
|
|
［1］Bhandari A R, Inoue J. Experimental study of strain rates effects on strain localization characteristics of soft rocks［J］. Soils and Foundations, 2005, 45(1): 125-140.
［2］Rechenmacher A L, Abedi S, Chupin O, et al. Characterization of mesoscale instabilities in localized granular shear using digital image correlation［J］. Acta Geotechnica, 2011, 6(4): 205-217.
［3］王学滨, 杜亚志, 潘一山. 基于DIC粗–细搜索方法的单轴压缩砂样的应变分布及应变梯度的实验研究［J］. 岩土工程学报, 2012, 34(11): 2050-2057.
［4］王学滨, 杜亚志, 金石. 基于数字图像相关方法的剪切带宽度的影响因素分析［J］.世界科技研究与发展, 2012, 34(3): 359-363.
［5］王学滨, 杜亚志, 潘一山. 考虑一阶和二阶位移梯度的数字图像相关方法在剪切带测量中的比较［J］. 工程力学, 2013, 30(7): 282-287.
［6］任茂栋, 梁晋, 唐正宗, 等. 数字图像相关法中的优化插值滤波器［J］. 西安交通大学学报, 2014, 48(7): 65-70.
［7］资新运, 耿帅, 赵姝帆, 等. 3 种亚像素位移测量算法的比较研究［J］. 计量学报, 2015, 36(3): 260-267.
［8］潘兵, 吴大方, 夏勇. 数字图像相关方法中散斑图的质量评价研究［J］. 实验力学, 2010, 25(2): 120-129.
［9］杜亚志, 王学滨, 冯威武, 等. 基于一阶及二阶灰度梯度的散斑图质量评价方法［J］. 光学技术, 2017,43(2):169-175.
［10］Zhou P, Goodson K E. Subpixel displacement and deformation gradient measurement using digital image/speckle correlation［J］. Optical Engineering, 2001, 40(8): 1613-1620.
［11］Lu H, Cary P D. Deformation measurements by digital image correlation: Implementation of a second-order displacement gradient［J］. Experimental Mechanics, 2000, 40(4): 393-400. |
|
|
|
2018, Vol. 39 
