【摘要】 基于等效结构应力法和BS7608焊缝疲劳分析方法,分析了不同坡角的K形对接焊缝的疲劳性能.分别采用ANSYS和Fe-safe对其进行静力分析和疲劳分析,得到K形对接焊缝本身的疲劳寿命和焊趾处的疲劳寿命.计算结果表明,焊趾处存在明显名义应力集中且随着坡口角度的增大而增大;焊趾处疲劳强度最低,焊趾的疲劳强度随坡角的增大而降低;焊缝自身的疲劳强度随着坡角的增大而有所提高.增大焊缝坡口角度有利于焊缝自身的抗疲劳性能,却不利于焊趾,这对钢结构加工过程中焊缝坡角的选择具有参考意义.更多还原

【Abstract】 According to equivalent structural stress method and BS7608 fatigue analysis method of butt weld, the fatigue property of K-shaped butt weld with different grooves is analyzed.The static and fatigue analysis is carried out by ANSYS and Fe-safe to obtain the fatigue results.According to the result,a significant concentration of nominal stress exist on the weld toe and increases with the angle of the groove.The fatigue strength of weld toe is the lowest,but it decreases with the angle of groove.The bigger the angle of groove is,the higher the fatigue strength of the weld itself is.A bigger angle of groove is conducive to the property of fatigue resistance of weld itself but not to weld toe,which may be referred in the selection of weld style in the production of structure.更多还原