Estimation of the ductile unstable fracture of pipe with a circumferential surface crack subjected to bending

Kurihara, Ryoichi; Ueda, Shuzo; Sturm, D.

doi:10.1016/0029-5493(88)90283-x

Cited by 12 publications

(4 citation statements)

References 5 publications

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“…Although Kurihara et al 12 recommended values of κ = 2 and µ = 0.2 for the exponents, the results are almost indistinguishable from those obtained by using κ = 3 and µ = 0.3. Because the value of m in Eq.…”

Section:     mentioning

confidence: 74%

“…Both the failure modes and moments of the original set of test data from four-point bending failure tests on pressurized, PTW circumferentially cracked, Type 304 stainless steel pipes at room temperature (used by Kurihara et al 12 ) can be predicted somewhat better by the current model with λ = 0.2 and γ = 0.2 than by the Kurihara model. 2 This approach led to reasonable predictions of failure temperatures of tubes with two symmetrical PTW circumferential notches subjected to high temperature ramps.…”

Section:     mentioning

confidence: 78%

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Validation of failure and leak rate correlations for stress corrosion cracks in steam generator tubes.

Majumdar¹,

Bakhtiari²,

Kasza³

et al. 2002

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This report summarizes models for the prediction of failure pressures and leak rates under normal operation and design-basis accident conditions in steam generator tubes with axial and circumferential cracks. These models were first validated through failure and leak rate tests at room temperature and at 282°C on tubes with rectangular, triangular, and trapezoidal notches fabricated by electrodischarge machining. They were then compared with failure and leak rate tests conducted on tubes with laboratory-generated outer-diameter stress corrosion cracks and steam generator tubes with fieldinduced stress corrosion cracks, which have highly complex morphology. Complex crack profiles are addressed using a model based on the concept of equivalent rectangular cracks. The predictions of the models are in reasonable agreement with test results, the time-dependent initiation and increase of leak rates observed in some tests cannot be predicted by the model. impact specimen fastened by spot-welded straps to the tube with a 6. 35-mm (0.25-in.) gap between the jet exit and the impact specimen.. Executive SummaryThis report summarizes and validates the models used for predicting failure pressures and leak rates in unrepaired steam generator (SG) tubes with axial and circumferential cracks that developed under normal operation and design-basis accident conditions. Failure and leak rate tests have been conducted on SG tubes with outer diameter (OD), part-throughwall, electrodischarge machined (EDM) notches both at room temperature and at 282°C. Notch length in these tests ranged from 6 mm (0.25 in.) to 38 mm (1.5 in.), and notch depths of 60, 80, and 90% (in addition to 100% throughwall) were tested.Extensive tests on rectangular as well as trapezoidal and triangular part-throughwall flaws were conducted to derive a correlation for predicting ligament rupture pressure of tubes with axial notches, either shallow or deep.A procedure for defining an equivalent rectangular crack for an arbitrarily shaped notch or crack (e.g., ODSCC), based on multiparameter analysis of eddy current data from a rotating pancake coil, has been developed. Structural and leak rate analyses of the flaws and comparison with experimental data have shown that the ligament failure pressure in nonrectangular notches or SCCs can be predicted reasonably well. These predictions were made with a flow stress model that is strictly applicable to rectangular part-throughwall cracks, in which the actual crack profile was replaced by an equivalent rectangular crack.Interaction effects between two or more throughwall notches as influenced by ligaments separating the notches were analyzed by finite element analyses. It was found that for type 4 (staggered) axial notches with two 6-or 13-mm cracks, the ligament width has to be ≥0.8 to 1.1 mm in order for their strength (i.e., unstable burst pressure) to exceed that of notches without the ligament. For type 2 (colinear) notches of similar size, the ligament width has to be greater than 1.8 to 2.5 mm to stren...

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Section:     mentioning

confidence: 74%

Section:     mentioning

confidence: 78%

Validation of failure and leak rate correlations for stress corrosion cracks in steam generator tubes.

Majumdar¹,

Bakhtiari²,

Kasza³

et al. 2002

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show abstract

“…For that short range of short angles, an elastic-plastic fracture mechanics method is necessary for these small cracks. For example, Kurihara et al (1988) observed this phenomenon while performing tests on a short surface cracked pipe subjected to bending. Kurihara et al (1988) proposed a semi-empirical correction to the limit-load criterion on the basis of test results.…”

Section: General Remarksmentioning

confidence: 94%

“…For example, Kurihara et al (1988) observed this phenomenon while performing tests on a short surface cracked pipe subjected to bending. Kurihara et al (1988) proposed a semi-empirical correction to the limit-load criterion on the basis of test results. This limit-load criterion gives a conservative prediction by choosing an optimum parameter to empirically fit the experimental data for short and deep circumferential surface cracks.…”

Section: General Remarksmentioning

confidence: 94%

Uncertainty analysis for the net-section-collapse failure criterion of circumferentially cracked cylinders for multiple arbitrary-shaped circumferential cracks

Dingreville

Eckert-Gallup

Sallaberry

2014

International Journal of Pressure Vessels and Piping

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In this manuscript, a generalized net-section-collapse (NSC) failure criterion of circumferentially cracked pipes with multiple arbitrary-shaped cracks is presented. This generalized NSC formulation is capable of predicting the NSC moment of a pipe with multiple arbitrary-shaped cracks distributed around the circumference of the pipe, regardless of whether they are distributed symmetrically or not. The case in which internal cracks straddle the compressive zone is accounted for in the present formulation. Closed form solutions are provided for the maximum moments of pipes containing multiple cracks with idealized shapes, namely constant depth, semi-elliptical and parabolic crack profiles. Through a series of examples, the results show the effectiveness and accuracy of the method. Using this method, quantification of the effect of the crack profile uncertainty on the maximum bending moment sustained by a cracked pipe is evaluated. It is demonstrated that while the uncertainty associated with the surface roughness of the crack profile has little to no effect on the maximum bending moment, irregular shape profiles have, not surprisingly, a large effect on the estimation of the maximum bending moment. In fact, it is mathematically shown that the uncertainty associated with the maximum bending moment

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Leak before Break

Takahashi

2003

Comprehensive Structural Integrity

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Estimation of the ductile unstable fracture of pipe with a circumferential surface crack subjected to bending

Cited by 12 publications

References 5 publications

Validation of failure and leak rate correlations for stress corrosion cracks in steam generator tubes.

Validation of failure and leak rate correlations for stress corrosion cracks in steam generator tubes.

Uncertainty analysis for the net-section-collapse failure criterion of circumferentially cracked cylinders for multiple arbitrary-shaped circumferential cracks

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