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SPECIAL SECTION PAPERS: Materials and Fabrication

Effect of Reverse Yielding on the Residual Contact Pressure in Tube-to-Tubesheet Joints

[+] Author and Article Information
Abdel-Hakim Bouzid

Professor
Fellow ASME
Ecole de Technologie Superieure,
1100 Notre-Dame Ouest,
Montreal, QC H3C 1K3, Canada
email: hakim.bouzid@etsmtl.ca

Mehdi Kazeminia

Ecole de Technologie Superieure,
1100 Notre-Dame Ouest,
Montreal, QC H3C 1K3, Canada
email: kazeminia.mehdi@gmail.com

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received April 11, 2015; final manuscript received June 10, 2016; published online July 22, 2016. Assoc. Editor: Allen C. Smith.

J. Pressure Vessel Technol 138(6), 061402 (Jul 22, 2016) (9 pages) Paper No: PVT-15-1061; doi: 10.1115/1.4033934 History: Received April 11, 2015; Revised June 10, 2016

The analytical prediction of the contact stress in tube-to-tubesheet joints subjected to hydraulic expansion is conducted without any consideration to reverse yielding that can occur inside the tube. Most existing models consider the tube and tubesheet to unload elastically when the expansion pressure is released. These models are therefore less conservative as they overestimate the contact pressure. An analytical model that considers strain-hardening material behavior of the tube and tubesheet and accounts for reverse yielding has been developed. The model is based on Henckey deformation theory and the Von Mises yield criteria. The paper shows that reverse yielding that is present in tubes during hydraulic expansion unloading makes the joint less rigid and causes a decrease in the contact pressure depending on the gap clearance and the materials used. A good correlation between the analytical and finite elements results is obtained on different treated cases which gives confidence on the developed model.

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References

Figures

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Fig. 3

Tube-to-tubesheet geometry

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Fig. 2

Expansion pressure sequence

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Fig. 1

Material model behavior

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Fig. 6

Variation of stresses at the tube outer diameter during expansion: case 1 with pe = 260 MPa (37.7 ksi)

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Fig. 7

Variation of stresses at the tubesheet inner diameter during expansion: case 1 with pe = 260 MPa (37.7 ksi)

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Fig. 4

Plane strain FE model

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Fig. 5

Variation of stresses at the tube inner diameter during expansion: case 1 with pe = 260 MPa (37.7 ksi)

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Fig. 8

Residual contact pressure variation and plastic zone as a function of expansion pressure case 1

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Fig. 9

Residual contact pressure variation and plastic zone as a function of expansion pressure case 2

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