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Research Papers: Design and Analysis

Modeling the Effects of Initial Tube-Tubesheet Clearance, Wall Reduction and Material Strain Hardening on Rolled Joint Strength

[+] Author and Article Information
A. Al-Aboodi

Mechanical Engineering Department, Buraydah College of Technology, P.O. Box 2663, Buraydah 81999, Saudi Arabia

N. Merah

Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabianesar@kfupm.edu.sa

A. R. Shuaib, Y. Al-Nassar

Mechanical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia

S. S. Al-Anizi

Consulting Services Department, Saudi Arabian Oil Company, Dhahran 31261, Saudi Arabia

J. Pressure Vessel Technol 130(4), 041204 (Aug 21, 2008) (6 pages) doi:10.1115/1.2967809 History: Received May 30, 2006; Revised January 31, 2007; Published August 21, 2008

The tube-to-tubesheet joint strength is measured in terms of residual contact pressure between the tube’s outer surface and tubesheet hole surfaces. The joint integrity is affected by several design parameters, including the type of tube and tubesheet materials, the level of expansion, and the initial radial clearance between the tube and tubesheet. In the present work, an axisymmetric finite element model based on the sleeve diameter and rigid roller concepts is developed. The model has been used to evaluate the combined effects of clearance, wall reduction level, and strain hardening of tube and tubesheet materials on the interfacial pressure between tube and tubesheet. The finite element results show that the initial clearance effect is dependent on the strain hardening capability of the tube material. For low strain hardening tube materials, the interfacial pressure remains almost constant well above the Tubular Exchanger Manufacturing Association maximum radial over tolerance of 0.0254mm(0.001in.). These results are validated by the experimental data developed during the research program. As expected, a drastic reduction in joint strength is observed at high values of radial clearances. The cutoff clearance (clearance at which the interfacial pressure starts to drop) is found to vary linearly with tube material hardening level. The residual pressure is found to increase slightly for moderate strain hardening tube materials but shows lower cutoff clearances. Wall reductions ranging from 1% to 12% were utilized in calculating the contact pressure as a function of radial clearance. The results show that for low strain hardening materials the optimum value of residual contact stress is obtained for the industry recommended value of 5%. Finally, because of the absence of plastic deformation in the ligament, the level of tubesheet material strain hardening does not have any noticeable effect on the joint strength.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Axisymmetric model (dimensions in mm (in.))

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Figure 2

(a) Geometry and (b) meshed axisymmetric model

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Figure 3

True stress–true strain curve representation for different strain hardening materials

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Figure 4

Loaded and residual radial displacements at the tube inner and outer tube surfaces (Ett=0.8GPa, 5%WR, and c=0.127mm)

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Figure 5

Loaded tube stress components, equivalent, and contact stresses at the tube outer surface (Ett=0.8GPa, 5%WR, and c=0.127mm)

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Figure 6

Released tube stress components, equivalent, and contact stresses at the tube outer surface (Ett=0.8GPa, 5%WR, and c=0.127mm)

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Figure 7

Residual contact stress vs clearance for different materials and for WR=5%

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Figure 8

Residual contact stress vs percentage of wall reduction for different tube materials and for c=0.127mm

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Figure 9

Effect of clearance on the residual contact stress for different percentages of wall reduction and tube material strain hardening levels: (a) Ett=0GPa and (b) Ett=1.2GPa

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Figure 10

Effect of clearance on the residual contact stress for a tubesheet material strain hardening level of 1.2GPa at WR=5%

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