Analysis of Mixed-mode of Non-collinear Fatigue Crack Propagation
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摘要: 以带多点损伤的空孔板为研究对象，利用数值分析法分析裂纹起裂位置和裂纹倾斜角对应力强度因子的影响，对比了共线多裂纹与非共线复合型裂纹起始扩展速率和扩展寿命的差异。结果表明：非共线复合型裂纹起始扩展速率偏大，裂纹扩展寿命缩短约2.5%。在非共线复合型裂纹模型中，随着裂纹倾斜角增加，等效应力强度因子先增大后减小，且在15°时，整体裂纹扩展速率达最大值。相邻孔间裂纹的相对位置和相对方位影响裂纹的扩展路径，进而影响裂纹扩展寿命。Abstract: Taking hollowed pre-notched plate with multiple-site damages (MSD) as study object, the influence of crack initiation positions and angles on the stress intensity factor was investigated using numerical analysis method in the paper. And the differences of the initial propagation rate and propagation life between the collinear multi-crack and non-collinear multi-mixed crack were also performed. The results indicated that, for the non-collinear mixed-crack, the initial propagation rate of crack was larger, while its propagation life was shortened by about two point five percent; moreover the equivalent stress intensity factor initially increased, followed by decreases as the crack angles increased. The overall crack propagation rate reached the maximum as the crack angle 15°. In addition, the relative position and relative orientation of the cracks between adjacent holes influenced their propagation paths, which would effect on the crack propagation life.
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表 1 2024-T3材料力学参数和模型几何参数
力学性能参数 几何参数 弹性模量/GPa 75 a1/mm 1 泊松比 0.32 a2/mm 2 板高H/mm 200 a3/mm 1 板宽W/mm 50 a4/mm 2 板厚d/mm 1.6 裂纹倾斜角θ/(°) 0/5/10/15/20/
25/30/35/45孔径D/mm 4 σmax/MPa 100 间距L/mm 10 R 0.01 σys/MPa 330.9 
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