利用有限元软件ABAQUS，对不锈钢板翅结构在真空钎焊过程中 产生的残余应力进行有限元分析，讨论钎缝间隙、 隔板厚度、翅片内距、翅片内高、翅片厚度、钎焊 温度、翅片层数、材料匹配程度以及压力对残余应力的影响. 计 算结果表明，由于镍基钎料和不锈钢母材力学性能的不匹配，在钎焊接头 中产生了较大的残余应力. 钎角处应力集中且状态 复杂，成为最薄弱环节. 钎缝间隙、隔板厚度、翅片 内距、翅片厚度、材料匹配程度以及压力是残余应力的主要影响因素, 钎焊温度、翅片层数以及翅片内高对残余应力的影响不大.
Micro Plate-fin heat exchanger (PFHE) is the typical candidate for the miniaturization of macro heat exchanger. A serious problem faced is that large residual stress generates during the vacuum brazing. This paper performed residual stress and its influencing factor analysis for brazed stainless steel plate-fin structure using finite element code-ABAQUS. Nine influencing factors were discussed such as brazing temperature, material mismatch, pressure load, brazing gap, fin height, fin pitch, fin thickness, fin layers and plate thickness. The results show that large residual stress generates in brazed joint due to mechanical properties mismatch between base metal and filler metal. Material mismatch, brazing gap, pressure load, fin pitch, fin thickness and plate thickness are the main influencing factors and have great effect on residual stress while the brazing temperature, fin height, fin layers have little influence. This work provides a reference for optimizing of brazing procedure for stainless steel plate-fin structure.
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