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Research Papers: Design and Analysis

Analytical Modeling of Hydraulically Expanded 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 131(1), 011208 (Dec 01, 2008) (9 pages) doi:10.1115/1.3027462 History: Received April 04, 2007; Revised October 02, 2007; Published December 01, 2008

The loss of the initial tightness during service is one of the major causes of failure of tube-to-tubesheet joints. The initial residual contact pressure and its variation during the lifetime of the joint are among the parameters to blame. A reliable assessment of the initial contact pressure value requires accurate and rigorous modeling of the elastoplastic behavior of the tube and the tubesheet during the expansion process. This paper deals with the development of a new analytical model used to accurately predict the residual contact pressure resulting from a hydraulic expansion process. The analytical model is based on the elastic perfectly plastic material behavior of the tube and the tubesheet and the interaction between these two elements of the expanded joint. The model results have been compared and validated with those of the more accurate finite element analysis models. Additional comparisons have been made with existing methods.

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Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Expansion pressure sequence

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Figure 2

Tube in partial reverse yielding

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Figure 3

Plane and axisymmetric FE models

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Figure 4

Case of expansion without reverse yielding: radial stress variation during expansion

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Figure 5

Case of expansion without reverse yielding: tangential stress variation during expansion

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Figure 6

Case of expansion without reverse yielding: equivalent stress variation during expansion

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Figure 7

Case of expansion with reverse yielding: radial stress variation during expansion

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Figure 8

Case of expansion with reverse yielding: tangential stress variation during expansion

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Figure 9

Case of expansion with reverse yielding: equivalent stress variation during expansion

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Figure 10

Effect of reverse yielding on the residual contact pressure

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Figure 11

Evaluation of the residual contact pressure with different methods

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