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Technical Briefs

Investigation of Hydrostatic Pressure Effect on the Residual Stresses of Circumferentially Butt-Welded Steel Pipes

[+] Author and Article Information
M. Foroutan1

 Department of Mechanical Engineering, Razi University, Kermanshah, Iran

M. E. Aalami-Aleagha, S. Feli, S. Nikabadi

 Department of Mechanical Engineering, Razi University, Kermanshah, Iran

1

Corresponding author.

J. Pressure Vessel Technol 134(3), 034503 (May 18, 2012) (4 pages) doi:10.1115/1.4005942 History: Received June 29, 2011; Revised October 22, 2011; Published May 17, 2012; Online May 18, 2012

In this paper, the effect of hydrostatic testing internal pressure on the residual stresses of circumferentially butt-welded steel pipes is investigated by a three dimensional finite elements simulation based on ansys 11 code. Residual stresses due to welding process are calculated by an uncoupled analysis. In this analysis, at first, a transient heat transfer problem is solved. Output of this analysis is temperature distribution history .This output is used as the structural analysis load. Output of structural analysis is welding residual stresses. The most important part of such simulations is modeling of heat power source. In the present work, heat power of welding electrode is simulated by a moving heat source with Gaussian distribution on a spherical domain. The presented model is used for calculation of residual stresses in an 8 in. three pass butt-welded steel pipe. Finally, the effects of hydrostatic testing internal pressure on the residual stresses are studied by the proposed model. The results obtained from this study show that the hydrostatic testing pressure has a significant effect on residual stresses.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 2

Axial residual stress at position 180 deg on the inside surface

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Figure 1

Three dimensional mesh of the first model

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Figure 3

Axial residual stress at position 180 deg on the outside surface

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Figure 4

Axial residual stress on the inside surface at position 0 deg before and after testing pressure

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Figure 5

Axial residual stress on the inside surface at position 180 deg before and after testing pressure

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Figure 9

Hoop residual stress on the inside surface at position 180 deg before and after testing pressure

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Figure 10

Hoop residual stress on the outside surface at position 0 deg before and after testing pressure

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Figure 11

Hoop residual stress on the outside surface at position 180 deg before and after testing pressure

Grahic Jump Location
Figure 6

Axial residual stress on the outside surface at position 0 deg before and after testing pressure

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Figure 7

Axial residual stress on the outside surface at position 180 deg before and after testing pressure

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Figure 8

Hoop residual stress on the inside surface at position 0 deg before and after testing pressure

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