摘要
采用迭加原理和Kachanov提出的简化方法,研究了裂纹间的相互作用机理,分析了不同裂纹布置形式所产生的增强或屏蔽效应,发现当微裂纹沿着或垂直于最大拉应力方向布置时都不产生最大的作用效应,这有别于Ortiz[ASME Journal of Applied Mechanics,1987,54(3):54-58]的结论.还探讨了混凝土类材料的微裂纹的产生机制及微裂纹区对主裂纹尖端产生的作用效应,得出微裂纹区对主裂纹是起增强的作用,增强程度随微裂纹密度和微裂纹长度的增大而增大的结论.
The mechanism interaction between cracks with different orientatiows was analyzed based on the principle of superposition and a flattening method. It is found that the maximum interaction effect will not occur when the micro crack is along the direction parallel or perpen- dicular to the principal tensile stress, which is different from the conclusion drawn by Ortiz [ ASME Journal of Applied Mechanics, 1987,54 （ 3 ） ： 54-581. The production mechanism of mi- crocrack and the effect of microcrack zone on main crack tip were also studied. As a result, the microcrack zone has magnifying effect on main crack tip, and such a magnifying effect increases with the increase of micro crack density and length.
出处
《应用数学和力学》
CSCD
北大核心
2010年第1期61-70,共10页
Applied Mathematics and Mechanics
基金
国家自然科学基金资助项目(10972072
50679022
10872052)
国家重点基础研究发展计划资助项目(2007CB714104)
河海大学水文水资源和水利工程国家重点实验室开放基金资助项目(2009585912)
关键词
迭加原理
应力强度因子
作用效应
微裂纹区
principle of superposition
stress intensity factor
interaction effect
microcrackzoIle
