机械连接件中螺栓孔角裂纹应力强度因子数值计算(英文) |
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作者单位: | 哈尔滨工业大学航天科学与力学系 |
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基金项目: | Foundation item: National Natural Science Foundation of China (10272036) |
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摘 要: | The three-dimensional finite element method is used to solve the problem of the quarter-elliptical comer crack of the bolt-hole in mechanical joints being subjected to remote tension. The square-root stress singularity around the corner crack front is simulated using the collapsed 20-node quarter point singular elements. The contact interaction between the bolt and the hole boundary is considered in the finite element analysis. The stress intensity factors (SIFs) along the crack front are evaluated by using the displacement correlation technique. The effects of the amount of clearance between the hole and the bolt on the SIFs are investigated. The numerical results indicate that the SIF for mode I decrease with the decreases in clearance, and in the cases of clearance being present, the corner crack is in a mix-mode, even if mode I loading is dominant.
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关 键 词: | 机械接头 应力强度因子 有限元方法 螺栓孔裂缝 |
收稿时间: | 31 October 2007 |
Numerical Computation of Stress Intensity Factors for Bolt-hole Corner Crack in Mechanical Joints |
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Authors: | Wang Liqing Gai Bingzheng |
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Affiliation: | Department of Astronautics and Mechanics, Harbin Institute of Technology, Harbin 150001, China |
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Abstract: | The three-dimensional finite element method is used to solve the problem of the quarter-elliptical comer crack of the bolt-hole in mechanical joints being subjected to remote tension. The square-root stress singularity around the corner crack front is simulated using the collapsed 20-node quarter point singular elements. The contact interaction between the bolt and the hole boundary is considered in the finite element analysis. The stress intensity factors (SIFs) along the crack front are evaluated by using the displacement correlation technique. The effects of the amount of clearance between the hole and the bolt on the SIFs are investigated. The numerical results indicate that the SIF for mode I decrease with the decreases in clearance, and in the cases of clearance being present, the corner crack is in a mix-mode, even if mode I loading is dominant. |
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Keywords: | bolt-bole comer crack contact stress intensity factor mechanical joint clearance finite element method |
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