对接接头应力集中系数的有限元分析

用有限元方法计算了对接接头焊趾部位的应力集中系数，分析了焊趾倾角和焊趾过渡圆弧对应力集中系数的影响．结果表明，通过减小焊趾倾角或（和）增大过渡圆弧半径的方法可以有效地缓和接头的应力集中．而焊趾过渡园弧的引入从力学和焊接冶金两个方面提高了接头的抗裂性．同时指出，单侧有加强高的对接接头比双侧都有加强高的接头有较小的应力集中系数．还给出了估算对接接头应力集中系数的回归方程式

Finite Element Analysis of Stress Concentration Factor of Butt Welded Joint

The stress concentraction factor(SCF) of butt welded joint was calculated by finite element method.The influence of weld toe angle and weld toe transition radius on SCF was also analysed.The result shows that is is possible to ease the stress concentration of butt welded joint effectiveby by decreasing the weld toe angle or/and increasing the weld toe transition radius.and that the introduction of weld toe transition is favourable to the prevention of cracks from the respects of mechanics and welding metallurgy.Its also pointed out that the weld joints with strengthened height on one side has smaller stress concentration factor than those having strengthened height on both sides.