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Crack Development in Fatigue Growth Assessment for Pipelines

Effects of initial crack aspect ratio, pipeline diameter, wall thickness, and loading conditions on the crack shape development were investigated. A new methodology for fatigue crack growth assessment is demonstrated. The study provides a refinement for more accurate prediction of remaining service life for pipelines. 

 

Product Number: 51317--9402-SG
ISBN: 9402 2017 CP
Author: Kathy Zhang
Publication Date: 2017
$0.00
$20.00
$20.00

Assessment of fatigue crack growth for pipelines is critical to evaluate the effects of operation pressure acting on flaws and predict the remaining service life. Under pressure cycling the crack propagates continuously until it reaches a critical size resulting in pipeline leaking or rupture. For most fatigue growth models relatively little attention has been paid is the effects of crack shape or aspect ratio on crack growth behaviors. This may result in less reliable results and thus potentially leads to an unrealistic integrity management and maintenance. As such developing a fully understanding of crack shape development during crack growth and estimating remaining life can be very important.In this work the development of crack aspect ratio (crack depth/half-crack length) was studied for semi-elliptical surface crack for pipelines undergoing pressure cycling. The effects of initial crack aspect ratio pipeline OD and wall thickness on the crack shape development were investigated. This study provides an in-depth understanding and more reliable assessment for the fatigue crack growth for pipelines.

Key Words: pipeline, fatigue crack growth, fit-for-service assessment, pressure cycling

Assessment of fatigue crack growth for pipelines is critical to evaluate the effects of operation pressure acting on flaws and predict the remaining service life. Under pressure cycling the crack propagates continuously until it reaches a critical size resulting in pipeline leaking or rupture. For most fatigue growth models relatively little attention has been paid is the effects of crack shape or aspect ratio on crack growth behaviors. This may result in less reliable results and thus potentially leads to an unrealistic integrity management and maintenance. As such developing a fully understanding of crack shape development during crack growth and estimating remaining life can be very important.In this work the development of crack aspect ratio (crack depth/half-crack length) was studied for semi-elliptical surface crack for pipelines undergoing pressure cycling. The effects of initial crack aspect ratio pipeline OD and wall thickness on the crack shape development were investigated. This study provides an in-depth understanding and more reliable assessment for the fatigue crack growth for pipelines.

Key Words: pipeline, fatigue crack growth, fit-for-service assessment, pressure cycling

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