Net-section limit moments and approximate J estimates for circumferential cracks at the interface between elbows and pipes

Song, Tae Kwang; Kim, Yun Jae; Oh, Chang Kyun; Jin, Tae Eun; Kim, Jong Sung

doi:10.1016/j.ijpvp.2009.03.008

Cited by 6 publications

(2 citation statements)

References 22 publications

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“…As a result, he obtained a J estimation equation and a reference stress (RS) based FAC, which are applicable to any types of stress-strain relation. The reference stress method has been further refined and successfully applied to various components in the piping system [7][8][9][10][11][12][13][14][15][16][17][18]. Furthermore, it has been incorporated into many standard procedures for structural integrity assessment.…”

Section: Introductionmentioning

confidence: 99%

“…axial through-wall crack at crown under pressure and in-plane bending [14]; circumferential through-wall crack located in the center of the elbow at the intrados or at the extrados and subjected to in-plane bending [15]. Similarly, applications of the reference stress method to the crack problem at the interface between straight pipe and elbow were limited to the case of circumferential through-wall crack [16] and circumferential constant-depth surface crack under in-plane bending [17]. Recently, Jang et al [19,20] reported a completed set of the fracture mechanics parameters of circumferential through-wall crack at the interface between elbow and straight pipe under internal pressure.…”

Section: Introductionmentioning

confidence: 99%

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Reference Stress Approach for Fracture Assessment of Extrados Circumferential Through-Wall Crack at the Interface between Elbow and Pipe Subjected to Internal Pressure

Kasivitamnuay

Singhatanadgid

2018

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The fracture assessment of a cracked component can provide technical support for an effective maintenance and a prevention of catastrophic accident. The present study applies the reference stress method to extend the J-integral solution from the finite element analysis for the Ramberg-Osgood stress-strain relationship to other types of stress-strain relationship. The problem in this study is an extrados circumferential through-wall crack at the interface between elbow and pipe subjected to internal pressure. The finite element results from the literature were analyzed to determine the optimized reference pressure. The fracture loads predicted by the reference-stress-based failure assessment curve which incorporated with the optimized reference pressure were compared with those predicted by the finite-element-based failure assessment curve. The failure load predicted from the reference-stress-based failure assessment curve deviated from that predicted from the finiteelement-based failure assessment curve within the range of-7% to 11%.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Reference Stress Approach for Fracture Assessment of Extrados Circumferential Through-Wall Crack at the Interface between Elbow and Pipe Subjected to Internal Pressure

Kasivitamnuay

Singhatanadgid

2018

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Limit load solutions for elbows with circumferential through-wall crack under the pressure-induced bending restraint effect

Kang

Choi

Lee

et al. 2019

International Journal of Pressure Vessels and Piping

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Plastic Load of Precracked Polyethylene Miter Pipe Bends Subjected to In-Plane Bending Moment1

EL-Bagory

Younan

Sallam

et al. 2013

Journal of Pressure Vessel Technology

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The main purpose of the present paper is to investigate the effect of crack depth on the plastic load (collapse load) of miter pipe bends (MPB) under in-plane bending moment. The experimental work is conducted to investigate multimiter pipe bends, with a bend angle 90 deg, pipe bend factor h = 0.844, standard dimension ratio (SDR) = 11, and number of welding junctions m = 3 under a crosshead speed 500 mm/min. The material of the investigated pipe is a high-density polyethylene (HDPE), which is used in natural gas (NG) piping systems. The welds in the miter pipe bends are produced by butt-fusion method. The crack depth varies from intrados to extrados location according to the in-plane opening/closing bending moment, respectively. For each in-plane bending moment, the plastic load is obtained by the tangent intersection (TI) method from the load–deflection curves produced by the testing machine specially designed and constructed in the laboratory.5 The study reveals that increasing the crack depth leads to a decrease in the stiffness and plastic load of MPB for both in-plane closing and opening bending moment. Higher values of the plastic load are reached in case of opening bending moment. This behavior is true for all investigated crack depths. A circumferential external crack has an obvious effect on the behavior of load–deflection curve. The linear elastic region in both mode of loading decreases with increasing crack depth.

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Net-section limit moments and approximate J estimates for circumferential cracks at the interface between elbows and pipes

Cited by 6 publications

References 22 publications

Reference Stress Approach for Fracture Assessment of Extrados Circumferential Through-Wall Crack at the Interface between Elbow and Pipe Subjected to Internal Pressure

Reference Stress Approach for Fracture Assessment of Extrados Circumferential Through-Wall Crack at the Interface between Elbow and Pipe Subjected to Internal Pressure

Limit load solutions for elbows with circumferential through-wall crack under the pressure-induced bending restraint effect

Plastic Load of Precracked Polyethylene Miter Pipe Bends Subjected to In-Plane Bending Moment1

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