水工弧形钢闸门未焊透缺陷的有限元分析

鉴于水工钢闸门的焊接质量直接关系到闸门运行安全,运用有限元理论和ANSYS子模型技术,建立含未焊透缺陷的弧形钢闸门有限元模型进行模拟分析。结果表明,在模拟尺寸范围内,考虑未焊透缺陷中最不利情况,即整体焊缝未焊透,未焊透缺陷应力集中系数介于2~12之间,且随未焊透深度增加呈增大趋势;其中,角焊缝最大应力集中系数为3.44,对整体结构影响较小,而对接焊缝最大应力集中系数为12.0,严重超出材料的相应容许应力,会引发裂纹,降低结构强度,因而在实际工程中,应尽量避免对接焊缝未焊透现象。

Finite Element Analysis of Incomplete Penetration Defect for Radial Steel Gate

The hydraulic steel gate welding quality is directly related to the safe operation of the gate. The finite element model of the radial steel gate with incomplete penetration defect is established by using the finite element theory and ANSYS sub model technology. The results show that for incomplete penetration defect, considering the defect in the most unfavorable situation, the stress concentration coefficient increased with the depth of incomplete penetration, and it is in the range of 2 and 12. Among all sub models, the fillet weld maximum stress concentration factor is 3.44, which has less impact on the overall structure. But the butt weld maximum stress concentration coefficient is 12.0, which seriously exceeded the material allowable stress and may cause crack and reduce structure strength of radial steel gate. Therefore, it should avoid the butt weld lack of penetration in actual engineering.