中北大学学报（自然科学版）2018，Vol.39Issue(5)：483-488,6.DOI:10.3969/j.issn.1673-3193.2018.05.001
基于数字散斑方法的花岗岩断裂力学特性研究
Study on Fracture Mechanics Characteristics of Granite Based on DIC Technique
摘要
Abstract
Based on the digital image correlation (DIC)technique,mode Ⅰ fracture toughness of granite was obtained through three-point bending tests of rectangular beam with pre-crack.The evolution laws of displacement field and strain field were analyzed when the specimens were cracking.The method of determining the tip of the process zone by using the high stress area where the strain teaches 0.4% is proposed.Based on this method,the speed of the tip of process zone is calculated.The results show that the extension of the process zone and its speed during the experiment can be quantitatively calculat-ed by the digital speckle correlation method,and the velocity accelerates with the extension of the process zone.关键词
数字散斑/三点弯曲/断裂韧度/过程区/断裂特性Key words
digital image correlation/three-point bending/fracture toughness/process zone/fracture features分类
建筑与水利引用本文复制引用
王学怀,武晋文,高经武,吕琪..基于数字散斑方法的花岗岩断裂力学特性研究[J].中北大学学报（自然科学版）,2018,39(5):483-488,6.基金项目
国家自然科学基金青年基金资助项目(51504220) （51504220）
