含孔的焊接结构疲劳寿命分析

Analysis on Fatigue Life of Welded Structure with Hole

针对含有孔的焊接结构的疲劳寿命问题,以不同孔位和焊缝余高为条件,分析焊缝和孔的应力状态及在此条件下焊接结构的疲劳寿命,并建立了孔位Ti与焊缝余高H的关系,以确定其对含孔的焊接结构疲劳寿命的影响因素。结果表明:焊缝余高H≥0.01 mm时,孔对焊接结构的疲劳寿命影响很小,可以忽略。当孔位Ti=30 mm、焊缝余高H=0.05 mm时焊接结构的疲劳寿命最大。

According to the fatigue performance problem of welded joints with hole, and the fatigue performance problem of the welded joint and the effect rules by the coupling of stress of excess weld metal and hole under different welding position and excess weld metal were simulated by finite element software. The results show that when excess weld metal is zero or much smaller, the effect of hole on the fatigue life of weld joint was little. When the welding position T1 is 30 mm, and excess weld metal H is 0.05 mm, the fatigue life of the weld joint is maximum.