用弹性有限元方法分析管状异种钢焊接接头的热应力分布

The Analysis of the Themal Stress Distribution with Plastic Finite Elements Method of Tube Dissimilar Metal Joints

对管状奥氏体／铁素体异种焊接连头进行数学模型化，采用弹性力学有限元分析方法计算分析了不同坡口形状，线膨胀系数及熔合区存在的马氏体层对热应力的影响。计算结果表明，６０°角坡口有较好的热应力分布状态；马氏体层内以压应力和较低的拉应力为主，最大拉应力分布在焊缝上。

The plastic finite elements method were used to analysis the themal stress of austenitic / feritic dissimilar metal joints. The effect of the groove angle, expansion conefficient and the martensite layer in the fusion zone on the themal stress were analysised. The results shown that the better thermal stress distribution comes from the joint with 60 degree groove angle. The thermal stress distribution in the martesite layer was mainly compressive stress and low tensile stress, the maximum tensile stress was Occurred th the weld metal.