不同形式P92钎焊接头蠕变损伤有限元模拟

FE Simulation of Creep Damages in P92 Brazing Joints

基于有限元软件研究一系列镍基平板钎焊接头的蠕变损伤和蠕变断裂,同时对蠕变寿命进行了预测。考虑了由制造产生的残余应力,服役过程中的热应力和机械应力,利用FORTRAN语言,基于Norton公式和延性耗竭模型编写子程序计算蠕变损伤,评估不同接头形式对残余应力和蠕变损伤的影响。结果表明,残余应力主要产生在不连续部位,同时蠕变损伤急剧累积,加速裂纹萌生和断裂。增加搭接面积可在一定程度上增加接头寿命。

Having ANSYS software based to investigate both creep damage and rupture of the nickel-based plate＇ s brazing joints was implemented, including the prediction of creep life and having residual stress incurred by the fabrication process, the thermal stress in application and the mechanical stress considered and FORTRAN language employed as well as the model based to compile subroutine for the creep damage calculation and to evaluate influ- ences of different joints on both residual stress and creep at discontinuous structures; and the creep damages damage. The resuhs show that, residual stress can be seen accumulated dramatically can accelerate crack initiation and rupture and increasing the tangential overlap area can prolong the joint＇s life