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Research Papers: Pipeline Systems

The Effects of Residual Stress Distribution and Component Geometry on the Stress Intensity Factor of Surface Cracks

[+] Author and Article Information
Katsumasa Miyazaki

Materials Research Laboratory, Hitachi, Ltd., Hitachi, Ibaraki 317-8511, Japan

Masahito Mochizuki

Department of Manufacturing Science, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan

J. Pressure Vessel Technol 133(1), 011701 (Jan 20, 2011) (7 pages) doi:10.1115/1.4002671 History: Received April 16, 2007; Revised May 24, 2009; Published January 20, 2011; Online January 20, 2011

The stress intensity factor estimated by the appropriate modeling of components is essential for the evaluation of crack growth behavior in stress corrosion cracking. For the appropriate modeling of a welded component with a crack, it is important to understand the effects of residual stress distribution and the geometry of the component on the stress intensity factor of the surface crack. In this study, the stress intensity factors of surface cracks under two assumed residual stress fields were calculated. As residual stress field, a bending type stress field (tension-compression) and a self-equilibrating stress field (tension-compression-tension) through the thickness were assumed, respectively. The geometries of the components were plate and piping. The assumed surface cracks for those evaluations were a long crack in the surface direction and a semi-elliptical surface crack. In addition, crack growth evaluations were conducted to clarify the effects of residual stress distribution and the geometry of the component. Here, the crack growth evaluation means simulating increments of crack depth and length using crack growth properties and stress intensity factors. The effects of residual stress distribution and component geometry on the stress intensity factor of surface cracks and the appropriate modeling of cracked components are discussed by comparing the stress intensity factors and the crack growth evaluations for surface cracks under residual stress fields.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Geometry of components with a long crack: (a) plate model and (b) pipe model

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Figure 2

Assumed residual stress distribution

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Figure 3

Effect of component geometry on the stress intensity factor for long cracks in a two-dimensional model: (a) stress distribution: tension-compression and (b) stress distribution: tension-compression-tension

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Figure 4

Effect of stress distribution on the stress intensity factor for long cracks in a two-dimensional model: (a) plate model and (b) pipe model (R/t=5)

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Figure 5

Geometry of components with a semi-elliptical surface crack: (a) plate model and (b) pipe model

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Figure 6

Effect of component geometry on the stress intensity factor for surface cracks under tension-compression stress field: (a) a/c=0.1, (b) a/c=0.5, and (c) a/c=1.0

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Figure 7

Effect of component geometry on the stress intensity factor for surface cracks under tension-compression-tension stress field: (a) a/c=0.1, (b) a/c=0.5, and (c) a/c=1.0

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Figure 8

Schematic of the effect of surface crack shape on the stress intensity factor

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Figure 9

Crack growth property for sensitized stainless steel in BWR normal water chemistry (12)

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Figure 10

Variations of stress intensity factors in SCC extension under tension-compression stress for plate and pipe models: (a) deepest point and (b) surface point

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Figure 11

Variations in crack growth behavior in SCC under tension-compression stress for plate and pipe models

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Figure 12

Variations of stress intensity factors in SCC extension under tension-compression-tension stress for plate and pipe models: (a) deepest point and (b) surface point

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Figure 13

Variations in crack growth behavior in SCC under tension-compression-tension stress for plate and pipe models

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Figure 14

Effect of residual stress field on crack growth behavior in SCC for plate and pipe models: (a) plate model and (b) pipe model (R/t=5)

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