| 受压剪应力作用闭合裂纹的光弹性研究 |
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| 引用本文： | 王建华,冯德益. 受压剪应力作用闭合裂纹的光弹性研究[J]. 地震学报, 1990, 12(2): 204-211 |
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| 作者姓名： | 王建华 冯德益 |
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| 作者单位： | 1. 天津大学2. 天津市地震局 |
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| 摘 要： | 文中给出了受压剪应力作用闭合裂纹端部应力场的断裂力学解.提出了一种预制闭合裂纹的新方法.对闭合裂纹做了新的光弹性研究.分析了应力强度因子(SIF)及闭合裂纹表面摩擦力的变化.探讨了压剪闭合共线双裂纹之间奇异应力场的相互作用.用有限元法对压剪闭合裂纹SIF所做的计算说明,本文实验结果合理.最后,讨论了本文结果在震源研究中的某些应用.
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| 关 键 词： | 震源物理 断裂力学 压剪裂纹 构造应力场 |
PHOTOELASTIC STUDY OF CLOSED CRACK UNDER COMPRESSION AND SHEAR |
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| Affiliation: | 1. Jianjin University;2. Scistnological Bureau of Tianjin |
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| Abstract: | The fracture mechanics solusion of the stress field near the tip of a closed crack under compression and shear is given and a new method for prefabricating closed cracks is developed in this paper. The compression-shear closed crack is studied by means of photoelasticlty,and the changes of both the stress field near the crack tip and the distribution of friction on the closed crack are studied. Futhermore,the interaction of the singular stress field between,two initially closed collinear cracks is also studied by photoelasticity. The stress intensity factor (SIF) of the compression-shear closed crack is computed by the finite element nethod. It shows that the results in the paper are correct. Finally,some applications in the research on the seismic focus are discussed. |
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