Crack-opening-area analyses for circumferential through-wall cracks in pipes—Part II: model validations

Rahman, Sharif; Brust, F. W.; Ghadiali, N.; Wilkowski, G.

doi:10.1016/s0308-0161(97)00082-3

Cited by 35 publications

(13 citation statements)

References 10 publications

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“…(1) - (6). It should be noted that there could be a number of different ways to fit stressstrain data using the R-O relationship, which in turn could provide very different J estimates.…”

Section: Relevant R-o Fit To Accurate J Estimatesmentioning

confidence: 99%

Engineering J Estimation Methods for Leak-Before-Break Analyses of Nuclear Piping

Kim

Huh

Kim

2005

JSME Int. J., Ser. A

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The present work presents a method to estimate elastic-plastic J for circumferential through-wall cracked pipes for the Leak-Before-Break (LBB) analysis of pressurized piping. The proposed method is based on the GE/EPRI approach and the key issue is to propose a robust Ramberg-Osgood fitting procedure. Two different estimation schemes are given, one for the case when full stress-strain data are available, and the other for the case when only yield and ultimate tensile strengths are available. The proposed J estimates are compared with those from extensive elastic-plastic finite element (FE) analyses. Experimental validation is also performed by comparing maximum moments predicted by fracture mechanics analysis using the proposed J estimates with those from full-scale pipe test. Both results show sufficient confidence in the accuracy of the proposed J estimates.

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“…(1) - (6). It should be noted that there could be a number of different ways to fit stressstrain data using the R-O relationship, which in turn could provide very different J estimates.…”

Section: Relevant R-o Fit To Accurate J Estimatesmentioning

confidence: 99%

Engineering J Estimation Methods for Leak-Before-Break Analyses of Nuclear Piping

Kim

Huh

Kim

2005

JSME Int. J., Ser. A

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“…It should be noted that the proposed R-O fit is robust in the sense that for a given material, a unique set of the R-O parameters can be determined from Eqs. (8) and (9). The proposed R-O fit, Eqs.…”

Section: Cod Estimates Based On Ge/epri Approachmentioning

confidence: 99%

“…In summary, when full stress-strain data are available, Eqs. (8) and (9), can be used to estimate the R-O parameters, α and n. On the other hand, when only yield and tensile strengths are available, Eqs. (8) and (10) can be used.…”

Section: Cod Estimates Based On Ge/epri Approachmentioning

confidence: 99%

“…For a given material, the R-O parameters, α and n, are determined from engineering stress-strain data using Eqs. (8) and (9). Resulting values of α and n (n 1 ) are given in Table 2.…”

Section: Cod Estimatesmentioning

confidence: 99%

“…The first one utilizes the material tensile properties in the form of the Ramberg-Osgood (R-O) relation. The so-called GE/EPRI approach (6), (7) belongs to this category, and other related estimation schemes can be found in Rahman et al (8), (9) Despite extensive experimental validation of this approach (9) , it has one inherent problem that the R-O fitting process is not robust, and accordingly quite different estimates of J and COD could be made for a given material (9) - (11) . The second approach is the reference stress approach (12), (13) , where actual stress-strain data are used, instead of the idealized stress-strain fit, to overcome the above-mentioned problem.…”

Section: Introductionmentioning

confidence: 99%

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Engineering Leak-Before-Break Analyses of Pressurized Piping: Part I- Crack Opening Displacement

Kim

Huh

Kim

et al. 2004

JSME Int. J., Ser. A

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The present work presents methods to estimate elastic-plastic COD for circumferential through-wall cracked pipes for the Leak-Before-Break analysis of pressurized piping. Proposed methods are based not only on the GE/EPRI approach but also on the reference stress approach. For each approach, two different estimation schemes are given, one for the case when full stress-strain data are available, and the other for the case when only yield and ultimate tensile strengths are available. For the GE/EPRI approach, a robust way of determining the R-O parameters is proposed, not only for the case when detailed information on full stress-strain data are available but also for the case when only yield and ultimate tensile strengths are available. The COD estimates according to the GE/EPRI approach, using the R-O parameters determined from the proposed R-O fitting procedures, overall compare well with the published pipe test data. For the reference stress approach, the COD estimates according to the method based both on full stress-strain data and on limited tensile properties are in good agreement with pipe test data. In conclusion, experimental validation given in the present work provides sufficient confidence in the use of the proposed method to practical LBB analyses, even when information on material's tensile properties is limited.

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Plastic limit pressures for cracked tube containing twin collinear axial through-wall cracks

et al. 2018

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Crack-opening-area analyses for circumferential through-wall cracks in pipes—Part II: model validations

Cited by 35 publications

References 10 publications

Engineering J Estimation Methods for Leak-Before-Break Analyses of Nuclear Piping

Engineering J Estimation Methods for Leak-Before-Break Analyses of Nuclear Piping

Engineering Leak-Before-Break Analyses of Pressurized Piping: Part I- Crack Opening Displacement

Plastic limit pressures for cracked tube containing twin collinear axial through-wall cracks

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