不锈钢板翅结构钎焊残余应力及其影响因素

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.

RESIDUAL STRESS AND ITS INFLUENCING FACTOR ANALYSIS FOR BRAZED STAINLESS STEEL PLATE-FIN STRUCTURE

The residual stress in brazed stainless steel plate-fin structure and its influencing factor were analyzed by using finite element code--ABAQUS. The results show that large residual stress is generated in brazed joint due to mechanical properties mismatch between base metal and filler metal. The residual stress in the fillet is concentrated and complex, and the fillet is the weakest zone. Brazing gap, plate thickness, fin pitch, fin thickness, material mismatch and compressed stress have great effect on the residual stress distribution, while the brazing temperature, fin height and fin layers have little influence.