Numerical Computation of Stress Intensity Factors for Bolt-hole Corner Crack in Mechanical Joints  

机械连接件中螺栓孔角裂纹应力强度因子数值计算(英文)

作　　者：王立清[1] 盖秉政[1] 

机构地区：[1]哈尔滨工业大学航天科学与力学系,黑龙江哈尔滨150001

出　　处：《Chinese Journal of Aeronautics》2008年第5期411-416,共6页中国航空学报（英文版）

基　　金：National Natural Science Foundation of China (10272036)

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.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.

关 键 词：bolt-hole comer crack contact stress intensity factor mechanical joint CLEARANCE finite element method 

分 类 号：TH114[机械工程—机械设计及理论]