不锈钢板翅结构钎焊残余应力三维数值模拟

利用有限元软件ABAQUS，对错流不锈钢板翅结构钎焊残余应力进行三维数值模拟，对模拟整个钎焊过程的方法和只模拟冷却过程的简化方法进行了比较．结果表明：由于镍基钎料BNi-2和304不锈钢母材热膨胀系数的差异，在钎焊接头处产生了较大的残余应力．2种分析方法所得的残余应力结果相差不大，残余应力主要在冷却过程中产生．因此，对板翅结构真空钎焊残余应力进行数值模拟，可采用只模拟冷却过程的方法，节约分析时间和成本．

3D numerical simulation of brazed residual stress in stainless steel plate-fin structure

Stainless steel plate-fin structure is fabricated by vacuum brazing.Due to the mismatch of mechanical properties between brazing filler metal and base metal,the welding residual stress is generated inevitably during the brazing process.Two numerical simulation methods were employed to simulate the residual stress distribution in brazed plate-fin structure by means of finite element code ABAQUS.One method was to simulate the whole brazing process,while the other to simulate the cooling process.The two calculated results are in accordance and the difference is very small.The residual stress is mainly generated during the cooling process.Hence,the method just simulating the cooling process can be used to predict the residual stress of brazed plate-fin structure,which can reduce the calculating time and cost greatly.