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Research Papers: Materials and Fabrication

Investigation of Fatigue Crack Propagation in Line Pipes Containing an Angled Surface Flaw

[+] Author and Article Information
Lichun Bian

Department of Civil and Resource Engineering, Dalhousie University, Halifax, NS, B3J 1Z1, Canada

Farid Taheri1

Department of Civil and Resource Engineering, Dalhousie University, Halifax, NS, B3J 1Z1, Canadafarid.taheri@dal.ca

1

Corresponding author.

J. Pressure Vessel Technol 130(1), 011405 (Jan 24, 2008) (8 pages) doi:10.1115/1.2826416 History: Received June 16, 2006; Revised November 17, 2006; Published January 24, 2008

The angled crack problem has been given special attention in the recent years by fracture mechanics investigators due to its close proximity to realistic conditions in engineering structures. In the present paper, an investigation of fatigue crack initiation and propagation in line pipes containing an inclined surface crack is presented. The inclined angle of the surface crack with respect to the axis of loading varies between 0deg and 90deg. Based on the concept of the effective stress intensity factor range Δkeff, the rate of fatigue crack propagation dbdN is postulated to be a function of the effective strain energy density factor range ΔSeff. This concept is applied to predict the crack growth due to fatigue loading. Furthermore, the threshold condition for nongrowth of the initial crack was established and assessed based on the experimental data.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

Details of the specimen geometry

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Figure 2

Crack front coordinates and loading system

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Figure 3

Plot of N versus β for α=90deg and ω=90deg

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Figure 4

Plot of Smin∕σ2 versus α for ω=90deg and β=90deg

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Figure 5

(a) Crack depth versus the number of cycles for inclined angle β=90deg, (b) crack depth versus the number of cycles for inclined angle β=75deg, (c) crack depth versus the number of cycles for inclined angle β=60deg, (d) crack depth versus the number of cycles for inclined angle β=45deg, (e) crack depth versus the number of cycles for inclined angle β=30deg, and (f) crack depth versus the number of cycles for inclined angle β=15deg

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Figure 6

The von Mises crack-tip plastic zones at the location of α=90deg along the semielliptical crack periphery for loading angle β=90deg, 60deg, and 30deg

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Figure 7

Plot of k2 versus k1 using three different nongrowth conditions

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