整体加筋翼梁疲劳裂纹扩展研究
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摘要
利用扩展有限元XFEM法模拟了整体加筋翼梁在等幅疲劳载荷下的裂纹扩展轨迹,并且进行了试验验证。通过分析裂纹尖端应力强度因子和T-应力的变化,研究了翼梁止裂筋截面积对翼梁止裂性能的影响。通过研究发现,止裂筋截面积越大,裂纹在止裂筋根部转折角度越大,止裂性能越好;止裂筋截面积一定的情况下,止裂筋厚宽比越大,止裂性能越好。
The crack growth trajectory of the integral stiffened spar is simulated by the extended finite element method and the experimental results are verified.By analyzing the change of stress intensity factors and T-stress at the crack tip,we study the influence of the section area on the crack arrest performance of the spar.The research shows that the larger the section area is,the bigger the turning angle of the crack at the root of the stiffener is.When the section area of the stiffener is constant,the ratio of the thickness to width is bigger,the crack arresting performance is better.
引文
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