三维数字图像相关法在带孔洞试件力学行为研究中的应用

Application of 3D digital image correlation method in mechanical behavior of specimens with holes

为研究不同形状的孔洞边缘区域应变分布规律,将三维光学全场应变测量系统与试验机同步,实时获取在拉伸荷载作用下孔洞边缘区域的变形图像。运用三维数字图像相关法计算不同形状的孔洞边缘区域全场应变分布。结果表明,孔洞的高宽比越小,应变越集中;菱形和椭圆形孔洞高宽比相同时,菱形孔洞应变更加集中。

To study the strain distribution of the marginal regions of different shaped holes,we synchronized a three-dimensional optical full-field strain measurement system with the testing machine to obtain real-time deformation images of the marginal regions of the hole under tensile load.Three-dimensional digital image correlation method was used to calculate the full-field strain distribution in the marginal regions of different shaped holes.The results show that the smaller the ratio of height to width of the hole is,the more concentrated the strain becomes.When the ratios of height to width of the diamond and oval holes are the same,the strain of the diamond hole is more concentrated.