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Research Papers: Design and Analysis

Effect of Creep on the Residual Stresses in Tube-to-Tubesheet Joints

[+] Author and Article Information
Nor Eddine Laghzale

Department of Mechanical Engineering, Ecole de Technologie Superieure, 1100, rue Notre-Dame Ouest, Montreal, QC, H3C 1K3, Canadalagnore@yahoo.com

Abdel-Hakim Bouzid

Department of Mechanical Engineering, Ecole de Technologie Superieure, 1100, rue Notre-Dame Ouest, Montreal, QC, H3C 1K3, Canadahakim.bouzid@etsmtl.ca

J. Pressure Vessel Technol 132(6), 061210 (Oct 29, 2010) (6 pages) doi:10.1115/1.4001218 History: Received September 07, 2009; Revised November 27, 2009; Published October 29, 2010; Online October 29, 2010

Steam generators are the subject of major concern in nuclear power plant safety. Within these generators, the tightness barrier, which separates the primary and secondary circuits, is ensured by the existence of a residual contact pressure at the tube-to-tubesheet joint interface. Any leakage is unacceptable, and its consequences are very heavy in terms of the human and environmental safety as well as maintenance cost. Some studies have been conducted to understand the main reasons for such failure. However, no analytical model able to predict the attenuation of the residual contact pressure under the effect of material creep relaxation behavior. The development of a simple analytical model able to predict the change in the residual contact pressure as a function of time is laid out in this paper. The results from the analytical model are checked and compared with those of finite elements. A simulation conducted on a high temperature tube-to-tubesheet joint has shown that relaxation of the contact stress due to creep can be significant and should be considered in the design.

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Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Plane and axisymmetric FE models (dimensions in mm)

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Figure 2

Radial stress distribution after the expansion process

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Figure 3

Tangential stress distribution after the expansion process

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Figure 4

Radial stress distribution at the steady state condition

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Figure 5

Radial stress distribution at the steady state condition

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Figure 6

Radial stress distributions during the different operating conditions

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Figure 7

Tangential stress distributions during the different operating conditions

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Figure 8

Contact pressure relaxation with time

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