工程科学学报2017，Vol.39Issue(10)：1477-1484,8.DOI:10.13374/j.issn2095-9389.2017.10.003;
砂岩Ⅰ型断裂的尺寸效应试验研究
Experimental investigation for effect of size on sandstone Mode Ⅰ fracture
摘要
Abstract
To study the effect of specimen size on fracture parameters in Mode Ⅰ fracture issue, a group of geometrically similar sandstone specimens were tested by three-point bending. The result shows that as the size of specimen increases, apparent tensile strength decreases and the apparent fracture toughness and length of the process zone increase. These three factors are a function of size. Based on these test results, equivalent linear elastic fracture mechanics (ELEFM) was used to calculate fracture parameters such as the length of the process zone in rock material. The fracture mechanism of sandstone was identified to be between the perfectly plas-tic and perfectly brittle limits and the effect of size on quasi-brittle material was shown. To verify the correctness of ELEFM, the length of the process zone was obtained by digital image correlation (DIC) test and the experimental and theoretical results were found to fit well.关键词
岩石力学/尺寸效应/I型断裂/破裂过程区/数字图像匹配技术Key words
rock mechanics/size effect/Mode I fracture/process zone/digital image correlation分类
建筑与水利引用本文复制引用
彭剑文,李长洪,苗胜军..砂岩Ⅰ型断裂的尺寸效应试验研究[J].工程科学学报,2017,39(10):1477-1484,8.基金项目
国家基础研究发展计划资助项目(973 计划)(2015CB060200) （973 计划）
