Butt joint and cross joint were designed for TA23 thin titanium alloy,and a series of fatigue tests were carried out,and the fatigue grade curves of two welded joints were obtained.Based on notch stress evaluation method,considering the influence of different virtual radii on notch stress field,the notch stress concentration factors of two kinds of welded joints under different virtual radii were calculated by establishing finite element model.Combined with fatigue test data,the S-N curves and scatter index of two kinds of welded joints under different virtual radii were fitted to optimize the virtual radius of thin-plate titanium alloy structure.The results show that the virtual radius of 1mm is more suitable for TA 23 thin-plate titanium alloy.
关键词
TA23钛合金/焊接接头/缺口应力/S-N曲线
Key words
TA23 Titanium alloy/welded joint/virtual radius/fatigue test
维普
万方数据