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Closed-Form Solutions for Stress Intensity Factor and Elastic Crack Opening Displacement for Circumferential Through-Wall Cracks in the Interface between an Elbow and a Straight Pipe under Internal Pressure
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 Title & Authors
Closed-Form Solutions for Stress Intensity Factor and Elastic Crack Opening Displacement for Circumferential Through-Wall Cracks in the Interface between an Elbow and a Straight Pipe under Internal Pressure
Jang, Youn-Young; Jeong, Jae-Uk; Huh, Nam-Su; Kim, Ki-Seok; Cho, Woo-Yeon;
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 Abstract
Fracture mechanics analysis for cracked pipes is essential for applying the leak-before-break (LBB) concept to nuclear piping design. For LBB assessment, crack instability and leak rate should be predicted accurately for through-wall cracked pipes. In a nuclear piping system, elbows are connected with straight pipes by circumferential welding; this weld region is often considered a critical location. Hence, accurate crack assessment is necessary for cracks in the interface between elbows and straight pipes. In this study, the stress intensity factor (SIF) and elastic crack opening displacement (COD) were estimated through detailed 3D elastic finite element (FE) analyses. Based on the results, closed-form solutions of shape factors for calculating the SIFs and elastic CODs were proposed for circumferential through-wall cracks in the abovementioned interfaces under internal pressure. In addition, the effect of the elbow on shape factors was investigated by comparing the results with the existing solutions for a straight pipe.
 Keywords
Stress intensity factor (SIF);Crack opening displacement (COD);Linear elastic fracture mechanics;Elbow;Leak-before-break (LBB);Crack instability;
 Language
Korean
 Cited by
1.
Prediction of fracture parameters of circumferential through-wall cracks in the interface between an elbow and a pipe under internal pressure,;;;

Journal of Mechanical Science and Technology, 2016. vol.30. 9, pp.4217-4226 crossref(new window)
1.
Common Defect Analysis for Large Section Special Steel Forging, Materials Science Forum, 2017, 898, 1208  crossref(new windwow)
2.
Prediction of fracture parameters of circumferential through-wall cracks in the interface between an elbow and a pipe under internal pressure, Journal of Mechanical Science and Technology, 2016, 30, 9, 4217  crossref(new windwow)
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