Interaction between cracks and effect of microcrack zone on main crack tip  

作　　者：夏晓舟 章青 乔丕忠 李丽娟 

机构地区：[1]The Faculty of Construction,Guangdong University of Technology [2]State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering,Hohai University [3]Department of Engineering Mechanics,Hohai University [4]Department of Civil and Environmental Engineering,Washington State University

出　　处：《Applied Mathematics and Mechanics(English Edition)》2010年第1期67-76,共10页应用数学和力学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos. 10972072, 50679022, and 10872052);National Basic Research Program of China (No. 2007CB714104);the state Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering at Hohai University (No. 2009585912)

摘　　要：Mechanism interaction between cracks with different orientation angles is analyzed based on the principle of superposition and a flattening method. It is found that the maximum interaction effect does not occur when the microcrack is along the direction parallel or perpendicular to the principal tensile stress, which is different from the conclusion drawn by Ortiz （1987）. The mechanism of microcrack generation and the effect of the microcrack zone on the main crack tip are studied. It is concluded that the microcrack zone has effect on the main crack tip, which increases with the increase of microcrack density and length.Mechanism interaction between cracks with different orientation angles is analyzed based on the principle of superposition and a flattening method. It is found that the maximum interaction effect does not occur when the microcrack is along the direction parallel or perpendicular to the principal tensile stress, which is different from the conclusion drawn by Ortiz （1987）. The mechanism of microcrack generation and the effect of the microcrack zone on the main crack tip are studied. It is concluded that the microcrack zone has effect on the main crack tip, which increases with the increase of microcrack density and length.

关 键 词：principle of superposition stress intensity factor interaction effect microcrack zone 

分 类 号：O346.1[理学—固体力学]