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RESEARCH PAPERS

Reliability Study of the Hydraulically Expanded Tube-to-Tubesheet Joint

[+] Author and Article Information
Caifu Qian, Chenghong Duan, Hongjie Yu, Hongwei Duan, Junli Tian

 Beijing University of Chemical Technology, Beijing 100029, P.R.C.

J. Pressure Vessel Technol 128(3), 408-413 (Jul 18, 2005) (6 pages) doi:10.1115/1.2222375 History: Received May 13, 2004; Revised July 18, 2005

A three-dimensional parametrized finite element model is established for the nonlinear analysis of the hydraulically expanded tube-to-tubesheet joint. Distribution of the residual contact pressure on the contact surface between the tube and the tubesheet is investigated. It is found that sealing circular bands exist on the contact surface which enhance the sealing of the joint since the residual contact pressures on the sealing circular bands are higher than on other positions. The sealing circular bands are located close to the two ends of the hole when it is not grooved, but they are located at the two brinks of the groove for a grooved hole and in the latter case, the residual contact pressures are even higher, reflecting that the joint with a grooved tube-sheet hole is more capable of sealing. Experiments and finite element calculations for the pull-out force of the joint are also performed for different expansion pressures and groove widths. Results show that with the increase of the groove width, the measured pull-out force increases significantly and becomes larger and larger than the calculated one, which is owing to the scratch on the contact surface between the tube and tubesheet.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Selection of the expansion joint

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Figure 2

Ungrooved joint geometry

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Figure 3

Grooved joint geometry

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Figure 4

Finite element model of the expansion joint

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Figure 5

Distribution of the residual contacting pressure on the contact surface for the ungrooved joint under Pexp=170MPa

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Figure 6

Distribution of the residual contacting pressure on the contact surface for the grooved joint under Pexp=170MPa

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Figure 7

The smallest residual contacting pressure on the tightness bands for different expansion pressures

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Figure 8

Specimen of expansion joint

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Figure 9

Change of the pull-out force with the expansion pressure for the ungrooved joints

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Figure 10

Change of the pull-out force with the groove width for the grooved joints

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Figure 11

Tube surface after pulling out from the grooved expansion joint

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Figure 12

Hole surface after pull-out tests

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