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针对裂纹缺陷对弧形钢闸门强度的影响,运用有限元理论和ANSYS子模型技术,建立弧形钢闸门有限元模型,从弧形钢闸门整体模型不同位置取实体子模型,在实体子模型中考虑不同位置、不同长度、不同深度的裂纹缺陷,进行弧形钢闸门有限元计算分析。实例应用结果表明,裂纹缺陷处应力集中系数均随裂纹缺陷尺寸的增加而增大,缺陷处应力集中呈尖端效应,在构件运行时,裂纹区域应力集中会诱发裂纹扩展,减小构件的有效承载面积,降低结构的疲劳强度,在实际工程中应尽量避免裂纹的存在。
Aiming at the effect of crack defects on the strength of arc-shaped steel gate, finite element model and ANSYS sub-model are used to establish the finite element model of the arc-shaped steel gate. The solid sub-model is obtained from different positions of the overall model of the arc- Considering the crack defects at different positions, different lengths and different depths, the finite element analysis of the arc-shaped steel gate was carried out. The results of practical application show that the stress concentration factor at the crack defects increases with the increase of the crack size, and the stress concentration in the crack tip has a sharp effect. During the operation of the component, stress concentration in the crack area will induce crack propagation and reduce the effective load of the component Area, reduce the fatigue strength of the structure, in the actual project should try to avoid the existence of cracks.