| 有限长主裂纹与微裂纹的相互作用 |
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| 引用本文： | 闫相桥.有限长主裂纹与微裂纹的相互作用[J].哈尔滨工业大学学报,2006,38(4):503-506,545. |
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| 作者姓名： | 闫相桥 |
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| 作者单位： | 哈尔滨工业大学,复合材料与结构研究所,黑龙江,哈尔滨,150001 |
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| 摘 要： | 利用一种新的边界元方法来研究有限长主裂纹与微裂纹的相互作用.该边界元方法由Crouch与Starfield建立的常位移不连续单元和裂尖位移不连续单元构成.考虑了两个模型:有限长主裂纹与一个共线微裂纹的相互作用;有限长主裂纹与一对共线微裂纹的相互作用.在分析计算中取微裂纹与主裂纹的长度之比为0.05~0.4.数值结果表明,本数值方法对研究此类有限长主裂纹与微裂纹相互作用是非常有效的,可以揭示微裂纹尺寸的相对大小对有限长主裂纹与微裂纹相互作用的影响性.
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| 关 键 词： | 微裂纹增韧 边界元 应力强度因子 |
| 文章编号： | 0367-6234（2006）04-0503-04 |
| 收稿时间： | 2004-08-21 |
| 修稿时间： | 2004-08-21 |
Microcrack interacting with a finite main crack |
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| YAN Xiang-qiao.Microcrack interacting with a finite main crack[J].Journal of Harbin Institute of Technology,2006,38(4):503-506,545. |
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| Authors: | YAN Xiang-qiao |
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| Affiliation: | 1. Research Lab for Composite Materials, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: | This paper concerns with the microcrack-finite main crack interaction problem by using the boundary element method which consists of the non-singular displacement discontinuity element presented by Crouch and Starfield and the crack tip displacement discontinuity elements due to the author.Two models are used.One is "A Finite Main Crack Interaction with a Collinear Microcrack".The other is "A Finite Main Crack Interaction with a Pair of Symmetric Collinear Microcracks".In numerical computation,the ratio of the microcrack's length to the main crack' s varies from 0.05 to 0.4.Test examples are concluded that the present approach is very effective for analyzing this kind of crack problems.The numerical results can reveal the effect of the microcrack's size relative to the main crack's size on the microcrack-finite main crack interaction. |
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| Keywords: | microcrack toughening boundary element stress intensity factors |
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