| 裂纹间作用机制探讨及微裂纹区对主裂纹的作用效应研究 |
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| 引用本文： | 夏晓舟,章青,乔丕忠,李丽娟.裂纹间作用机制探讨及微裂纹区对主裂纹的作用效应研究[J].应用数学和力学,2010,31(1):61-70. |
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| 作者姓名： | 夏晓舟 章青 乔丕忠 李丽娟 |
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| 作者单位： | 河海大学 水文水资源与水利工程科学国家重点实验室,南京 210098;2.河海大学 工程力学系,南京 210098;3.广东工业大学 建设学院,广州 510006;4.华盛顿州立大学 土木与环境工程学院,华盛顿 99164-2910,美国 |
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| 基金项目： | 国家自然科学基金，科技部科研项目，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 |
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| 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．
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| 关 键 词： | 迭加原理 应力强度因子 作用效应 微裂纹区 |
| 收稿时间： | 2009-03-24 |
Interaction Between Cracks and Effect of Micro-Crack Zone on Main Crack Tip |
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| XIA Xiao-zhou,ZHANG Qing,QIAO Pi-zhong,LI Li-juan.Interaction Between Cracks and Effect of Micro-Crack Zone on Main Crack Tip[J].Applied Mathematics and Mechanics,2010,31(1):61-70. |
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| Authors: | XIA Xiao-zhou ZHANG Qing QIAO Pi-zhong LI Li-juan |
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| Institution: | State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, P. R. China; |
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| Abstract: | The mechanism interaction between cracks with different orientations 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 perpendicular to the principal tensile stress,which is different from the conclusion drawn by Ortiz ASME Journal of Applied Mechanics,1987,54(3):54-58].The production mechanism of microcrack 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. |
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| Keywords: | principle of superposition stress intensity factor interaction effect microcrack zone |
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