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Research Papers: Design and Analysis

Finite Element Analysis of the Effect of Brazed Residual Stress on Creep for Stainless Steel Plate-Fin Structure

[+] Author and Article Information
Wen-Chun Jiang

College of Mechanical and Power Engineering, Nanjing University of Technology, Xinmofan Road, Nanjing, 210009, P.R. Chinajiangwenchun@126.com

Jian-Ming Gong

College of Mechanical and Power Engineering, Nanjing University of Technology, Xinmofan Road, Nanjing, 210009, P.R. Chinagongjm@njut.edu.cn

Hu Chen

College of Mechanical and Power Engineering, Nanjing University of Technology, Xinmofan Road, Nanjing, 210009, P.R. Chinachh025@163.com

S. T. Tu

College of Mechanical and Power Engineering, Nanjing University of Technology, Xinmofan Road, Nanjing, 210009, P.R. Chinasttu@ecust.edu.cn

J. Pressure Vessel Technol 130(4), 041203 (Aug 20, 2008) (7 pages) doi:10.1115/1.2967807 History: Received December 04, 2006; Revised June 21, 2007; Published August 20, 2008

This paper presented a finite element analysis of the effect of brazed residual stress on creep for stainless steel plate-fin structure using finite element code ABAQUS . The as-brazed residual stress distribution generated during the brazing process was obtained. Two cases, which are denoted Cases 1 and 2, were analyzed and compared to discuss the effect of as-brazed residual stress on creep. Case 1 was to carry out creep analysis just at the internal operating pressure. Case 2 was to perform the creep analysis considering the internal operating pressure in conjunction with as-brazed residual stress. The results show that due to the mechanical property mismatch between filler metal and base metal, large residual stress is generated in the brazed joint, which has a great influence on creep for stainless steel plate-fin structure. The creep strain and stress distribution of the overall plate-fin structure is obtained. The position that is most likely to fail is the fillet for the plate-fin structure at high temperature. Especially in the fillet interface, the creep strain and stress distribution are discontinuous and uncoordinated, which have great effect on creep failure.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic of typical procedure for vacuum brazing of the plate-fin structure

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Figure 2

Configuration of the plate-fin structure

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Figure 3

Mesh of the plate-fin structure: (a) the whole model and (b) refined mesh of the partial enlarged zone C–C

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Figure 4

The initial stress contour for Case 1

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Figure 5

Creep stress contour at creep steady state for Case 1

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Figure 6

Stress distribution at different times for (a) P1 and (b) P2 for Case 1

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Figure 7

Creep stress variation with time of Node 770 for Case 1

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Figure 8

Shear strain CE12 contour at creep steady state for Case 1

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Figure 9

Creep strain distribution for (a) P1 and (b) P2 at steady state for Case 1

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Figure 10

The as-brazed residual stress contour

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Figure 11

The combined stress of brazed residual stress and internal operating pressure

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Figure 12

Creep stress contour at steady state for Case 2

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Figure 13

Creep strain contour at steady state for Case 2

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Figure 14

Creep stress distribution at different times for (a) P1 and (b) P2 for Case 2

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Figure 15

Creep stress variation with time for three nodes for Case 2

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Figure 16

Creep strain variation with time for Case 2

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