0
Research Papers: Design and Analysis

On the Ratchet Analysis of a Cracked Welded Pipe

[+] Author and Article Information
Tianbai Li, Weihang Chen, James Ure

Department of Mechanical Engineering,  University of Strathclyde, Glasgow, G1 1XJ, United Kingdom

Haofeng Chen1

Department of Mechanical Engineering,  University of Strathclyde, Glasgow, G1 1XJ, United Kingdomhaofeng.chen@strath.ac.uk

1

Corresponding author.

J. Pressure Vessel Technol 134(1), 011203 (Dec 01, 2011) (8 pages) doi:10.1115/1.4004802 History: Received May 12, 2011; Revised July 14, 2011; Published December 01, 2011; Online December 01, 2011

This paper presents the ratchet limit analysis of a pipe with an axisymmetric circumferential crack in a mismatched weld by using the extended linear matching method (LMM). Two loading conditions are considered: (i) a cyclic temperature load and a constant internal pressure and (ii) a cyclic temperature load and a constant axial tension. Individual effects of (i) the geometry of the Weld Metal (WM), (ii) the size of the crack, (iii) the location of the crack, and (iv) the yield stress of WM on the ratchet limits, maximum temperature ranges to avoid ratchetting, and limit loads are investigated. Influence functions of the yield stress of WM on the maximum temperature ranges and limit loads are generated. The results confirm the applicability of the extended LMM to the cracked welded pipe.

FIGURES IN THIS ARTICLE
<>
Copyright © 2012 by American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Grahic Jump Location
Figure 1

Welded pipe configurations with (a) an inner surface crack, (b) a central crack, and (c) an outer surface crack

Grahic Jump Location
Figure 2

Thermal and mechanical loads and boundary conditions of the cracked welded pipe: (a) Δθ + p or (b) Δθ + T

Grahic Jump Location
Figure 3

The operating temperature history of the fluid contained within the welded pipe

Grahic Jump Location
Figure 4

Finite element mesh of the welded pipe with an inner crack a = 0.5 w

Grahic Jump Location
Figure 5

Ratchet limit interaction curves of the welded pipe with the different r and the different crack locations. The pipe is subjected to (a) Δθ + p or (b) Δθ + T.

Grahic Jump Location
Figure 6

The nonratchetting/ratchetting mechanisms for the inner cracked welded pipe (Fig. 5a) subjected to a cyclic temperature range Δθ and a constant internal pressure (p/pPM = 0.15), when (a) r = 2, Δθ = 500°C (no ratchetting mechanism), (b) r = 1, Δθ = 185°C (ratcheting mechanism in WM) and (c) r = 0.5, Δθ = 88°C (ratchetting mechanism in WM)

Grahic Jump Location
Figure 7

Abaqus verification of the ratchet limit for the cyclic temperature of Δθ = 200°C using detailed step-by-step analysis

Grahic Jump Location
Figure 8

Ratchet limit interaction curves of the welded pipe with the different crack sizes a and the different r. The pipe is subjected to (a) Δθ + p or (b) Δθ + T.

Grahic Jump Location
Figure 9

Ratchet limit interaction curves of the pipe with the different thickness H of the WM and the different r. The pipe is subjected to (a) Δθ + p or (b) Δθ + T.

Grahic Jump Location
Figure 10

Ratchet limit interaction curves of the pipe with the different thermal expansion coefficients of the WM αWM and the different r, where αPM = 1.9 (× 10−5 °C). The pipe is subjected to (a) Δθ + p or (b) Δθ + T.

Grahic Jump Location
Figure 11

The effect of the yield stress of WM σyWM on (a) the limit loads and (b) the maximum temperature ranges of the pipe under (i) Δθ + p or (ii) Δθ + T

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In