Influences of some materials on J-estimation methods for pipes with circumferential surface cracks

Yang, Xinqi; Huo, Lixing; Hongshan, Qin; Liu, Yueli

doi:10.1016/s0308-0161(01)00067-9

Cited by 7 publications

(2 citation statements)

References 5 publications

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“…The EPRI approach has been implemented mainly for the most common cracked configurations 9,10 in piping and vessels, but also for others much more specific, such as ship structural details, 11 residual stresses accompanying external loads, 12 eccentric cracks, 13 or crack growth giving rise to leak before break processes 14 . The influence of the material itself 15 has also been investigated.…”

Section: Introductionmentioning

confidence: 99%

J‐integral determination in riveted beams of a structural old steel by estimation methods*

Moreno

Valiente

2007

Fatigue Fract Eng Mat Struct

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A B S T R A C T This work deals with the application of the J-integral estimation method to cracked riveted beams of old puddle iron. The ductility of some of these materials makes it necessary to use elasto-plastic fracture criteria to assess damage tolerance. This requires a high computational effort because it involves the determination of the J-integral in beams with plates and angles that interact by means of redundant forces dependent on crack size. The J-integral estimation method proposed by the Electric Power Research Institute could reduce this effort provided it were shown to be valid for this type of beam. This work contributes to this end by comparing the J-integral values resultant from the estimation method and a complete finite element modelling of a riveted beam consisting of two angles and a cracked plate made of actual puddle iron from a road bridge more than a century old but still in service. A number of samples removed from the bridge showed that this material failed in a ductile manner when it was fracture tested with fatigue precracked compact specimens, even at temperatures as low as −20 • C. The two types of J-integral values found are in good agreement over the ranges of load and crack size explored.Keywords fracture toughness; J-integral; old structural steel; ductile puddle iron. N O M E N C L A T U R Ea = crack size a = crack growth b = web width E = Young's modulus J ep = elastic-plastic J-integral J ep = estimated elastic-plastic J-integral J IC = fracture toughness as measured at ductile crack growth initiation J el , J pl = elastic, plastic component of J-integral M = applied bending moment M e = reference value of the applied bending moment M M f L = applied bending moment M at fracture initiation n = strain-hardening exponent R p0,2 , R m = yield, ultimate strength u = displacement in a cracked configuration u = estimated displacement in a cracked configuration u el , u pl = elastic, plastic component of displacement in a cracked configuration W , B = specimen width, thickness ν = Poisson's ratio

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Section: Introductionmentioning

confidence: 99%

J‐integral determination in riveted beams of a structural old steel by estimation methods*

Moreno

Valiente

2007

Fatigue Fract Eng Mat Struct

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“…Thus, prediction of elbow behaviour is very important in understanding the response of a piping system. While a large amount of papers (Brust et al, 1995;Rahman, 1997;Chattopadhyay et al, 2000a;Xinqi et al, 2001;Takahashi, 2002) is found reporting of crack in straight pipes, only a few articles (Shalaby and Younan, 1998;Chattopadhyay et al, 1995;Moulin et al, 1997;Yahiaoui et al, 2002;Chattopadhyay et al, 2000b;Chattopadhyay, 2002) deal with cracked pipe elbows. It is important to know its limit load for the safe operation of the plant.…”

Section: Introductionmentioning

confidence: 99%

Characterization of plastic collapse load determination in circumferentially through-wall cracked elbows

Saxena

Ramakrishnan

2006

Nuclear Engineering and Design

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On the accuracy of ductile fracture assessment of through-wall cracked pipes

Saxena

Murthy

2007

Engineering Structures

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Influences of some materials on J-estimation methods for pipes with circumferential surface cracks

Cited by 7 publications

References 5 publications

J‐integral determination in riveted beams of a structural old steel by estimation methods*

J‐integral determination in riveted beams of a structural old steel by estimation methods*

Characterization of plastic collapse load determination in circumferentially through-wall cracked elbows

On the accuracy of ductile fracture assessment of through-wall cracked pipes

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