基于UIC和JIS标准的焊接构架疲劳强度对比分析研究

Comparative Analysis of Fatigue Strength of Welded Frame Based on UIC and JIS Standards

运用UIC标准Goodman-Smith图法和JIS标准的疲劳评价方法,以地铁转向架构架的侧梁焊接结构为研究对象,使用有限元法对其疲劳强度进行对比研究。以JIS标准中的裂纹扩展法和名义应力法分别评估单边角焊缝和背面焊接位置角焊缝的焊根疲劳强度,以UIC标准中的结构应力法评估角焊缝的焊趾疲劳强度。结果表明,使用UIC标准考核构架侧梁焊缝的焊趾满足疲劳强度要求,而使用JIS标准考核构架侧梁焊缝的焊根不满足疲劳强度要求,因此对于焊接构架角焊缝应结合2个标准对其焊趾和焊根综合进行疲劳强度评估。

Using UIC standard Goodman-Smith diagram method and JIS standard fatigue evaluation method,the side beam welding structure of the subway bogie frame was taken as the research object,whose fatigue strength was contrastive studied by using finite element method.The fatigue strength of single-sided fillet welds and fillet welds in the back welding position was evaluated respectively by the crack propagation method and nominal stress method in the JIS standard.Meanwhile,the structural stress method of UIC was used to evaluate the fatigue strength of weld toe of fillet welds.The results showed that the fatigue evaluation by using the UIC standard to assess the weld toe of the welded joint of the frame met the fatigue strength requirements,while the fatigue evaluation by using the JIS standard to assess the welding root of the welded joint of the frame did not meet the fatigue strength requirements.Therefore,for the welded frame fillet welds,the two standards should be combined to evaluate the fatigue strength of both the weld toe and the weld root.