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TECHNICAL PAPERS

Fracture Mechanics Analysis of Fatigue Crack Repaired Joints

[+] Author and Article Information
J. Efraín Rodríguez-Sánchez

 Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, Edificio 19, Piso 1, Cubiculo 105A, 07730 México D.F.ersanche@imp.mx

William D. Dover

Feargal P. Brennan

 University College London, Department of Mechanical Engineering, Torrington Place, London WC1E, 7JE EnglandF.Brennan@btopenworld.com

Alejandro Rodríguez Castellanos

 Instituto Mexicano del Petróleo, Eje Central Lázaro Cárdenas 152, Edificio 28, Piso 1, 07730 México D.F.arcastel@imp.mx

J. Offshore Mech. Arct. Eng 127(2), 182-189 (Dec 15, 2004) (8 pages) doi:10.1115/1.1894408 History: Received April 14, 2004; Revised December 15, 2004

Fatigue life predictions based on fracture mechanics calculations are required to satisfy an increasing level of safety demanded by industry. These predictions are mainly used to schedule NDT inspections and with inspection data make structural integrity assessments. The periodic inspection-assessment process can lead to the implementation of a fatigue crack repair by crack removal. Fracture mechanics analysis is used again to determine whether or not a repair will be effective. For the case of tubular joints, in offshore structures, once repairs have been shown to be ineffective it is usually required to install a clamp to maintain the continuity of joint members if the structure is still required for production. In this paper a fracture mechanics analysis of crack repaired joints based on Y factors is presented. The analysis is used to predict fatigue life after crack removal and is validated against T-butts experimental data. The analysis is also extrapolated for the prediction of fatigue life of crack repaired tubular joints.

Copyright © 2005 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Comparison of experimental Y factors for T-butt specimens

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Figure 2

Sites of crack growth data collection along a short repair on a T-butt specimen (3)

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Figure 3

Y factors (denoted as f ) for an edge crack at a semicircular notch in an infinite plate subjected to: in-plane bending (top) and pure tension (bottom), R is notch radius and B is plate thickness (4)

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Figure 4

Comparison of experimental Y factors of edge repaired specimens versus weight function solution

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Figure 5

Crack growth rate versus a∕T for specimen UPD4R2

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Figure 6

Stress intensity factor range versus a∕T for specimen UPD4R2

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Figure 7

Comparison of experimental Y factors versus corrected Newman and Raju solution

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Figure 8

Crack in infinite plate under (a) two pairs of equal splitting forces and (b) pairs of discrete stresses (8)

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Figure 9

Weld influence on the stress distribution in a T-butt under bending (α=45 deg and ρ∕T=0.05)

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Figure 10

Weld influence on the Y factor in a T-butt under bending (α=45 deg and ρ∕T=0.05)

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Figure 11

Experimental and predicted crack growth curves for specimen TB300002 at the deepest crack point

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Figure 12

Experimental and predicted crack growth curves for specimen TB300001 at the deepest crack point

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Figure 13

Experimental, reproduced, and predicted crack growth curves for specimen TB300004 (R4D9L60) at the repair ends (sites 30 and 130)

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Figure 14

Experimental and predicted crack growth curves for specimen TB300003(R4D6L60) at the repair ends (sites 30 and 130)

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Figure 15

Proposed Y curves for bending for T-butts and tubular joints with weld geometries α=45 deg and ρ∕T=0.05

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