DEFORMATION MEASUREMENT OF ROCK DAMAGE BY DIGITAL IMAGE CORRELATION METHOD
用数字图像相关技术进行岩石损伤的变形分析

The digital image correlation technique is used to determine the deformation field of the rock material involving the microcracks. The light intensity pattern of the fine grain sandstone surface is taken from thescanning electron microscope,corresponding to different loading steps. Correlation computation is performed a pair of light intensity images to evaluate the displacement components. The results show that the deformation varies in different areas separated by subcracks,which implies the effect of crack opening and closing in rock.