| 平面应力条件下共线双裂纹的拉伸特性 |
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| 引用本文： | 范永波. 平面应力条件下共线双裂纹的拉伸特性[J]. 辽宁工程技术大学学报(自然科学版), 2010, 29(6) |
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| 作者姓名： | 范永波 |
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| 作者单位： | 中国科学院,力学研究所,北京,100190 |
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| 基金项目： | 973资助项目; 中国科学院工程地质力学重点实验室开放式基金; 国家自然基金资助项目(10702072) |
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| 摘 要： | 为探寻共面双线断续节理岩体平面应力条件下的拉伸特性,从远场应力角度出发,基于Fazil Erdogan(1962)在任意荷载条件下共线双裂纹的应力场分布思想,采用G.C.Sih(1972)提出的最小应变能密度因子判据(S判据),建立了远场应力与裂纹尖端附近应力场的对应关系,证明共线双裂纹在拉应力作用下自相似扩展;裂纹外侧与内侧的应力场分布形式相同,但数值偏小,且内侧裂纹先于外侧裂纹扩展;在材料性质、裂纹间距及长度已知的情况下,可反推材料破坏时的极限外力大小。
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| 关 键 词： | 共线双裂纹 拉应力 最小应变能密度因子 自相似扩展 |
Tensile properties about two collinear cracks under plane extension |
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| FAN Yongbo. Tensile properties about two collinear cracks under plane extension[J]. Journal of Liaoning Technical University (Natural Science Edition), 2010, 29(6) |
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| Authors: | FAN Yongbo |
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| Affiliation: | FAN Yongbo(Institute of Mechanics(IMECH),Chinese Academy of Sciences,Beijing 100190,China) |
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| Abstract: | In order to deduce the tension properties of intermittent jointed rock with double-line,in terms of far-field stress,this paper establishes a corresponding relationship between a far-field stress and the stress field around the crack tip based on the theory of stress distribution of two collinear cracks under any load(Erdogam,1962) and the minimum strain energy density factor criterion(Sih,1972).Furthermore,the paper demonstrates that the two collinear cracks follow self-similar extension under tensile stre... |
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| Keywords: | two collinear cracks tensile stress minimum strain energy density factor self-similar extension |
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