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

Acta Metall Sin

2008, Vol. 44

Issue (1): 105-111 DOI:

Research Articles

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

Wen-Chun JIANG

南京工业大学机械学院高温研究室

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Wen-Chun JIANG. RESIDUAL STRESS AND ITS INFLUENCING FACTOR ANALYSIS FOR BRAZED STAINLESS STEEL PLATE-FIN STRUCTURE. Acta Metall Sin, 2008, 44(1): 105-111 .

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Abstract 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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Received: 18 April 2007

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TG111.8

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2008/V44/I1/105

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