Transferability of elastic–plastic fracture toughness using the Weibull stress approach: significance of parameter calibration

Ruggieri, Cláudio; Gao, Xiaosheng; Dodds, Robert H.

doi:10.1016/s0013-7944(00)00052-7

Cited by 64 publications

(43 citation statements)

References 16 publications

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“…Constraint effect can be represented by stress triaxiality, Q parameter [10,11] or T-stress [12]. Here constraint is measured by T-stress which is defined by:…”

Section: Discussionmentioning

confidence: 99%

Design based on ductile–brittle transition temperature for API 5L X65 steel used for dense CO2 transport

Capelle

Furtado

Azari

et al. 2013

Engineering Fracture Mechanics

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Abstract. Safe and reliable transport of dense CO 2 by pipes needs a careful choice of the constitutive pipe materials to prevent brittle crack propagation after ductile or brittle failure initiation. This unexpected phenomenon can occur after failure or leak promoted by external interferences. In this case, the rapid decompression of dense CO 2 into gas leads to a very low local temperature of about -80°C. To prevent risk of brittle fracture initiation and propagation, the material must remain ductile at this temperature. In other terms, its ductile-brittle transition temperature (DBTT) has to be lower than -80°C minus a margin. It is admitted that the DBTT is not a material characteristic but depends on specimen geometry, loading rate and loading mode, i.e. on constraints. A loss in constraint leads to a lower brittle-ductile transition temperature. In order to select a steel for transportation of dense CO 2 , transition temperatures T t (from tensile test), T K27 and T K50 (from Charpy test) and T K100 (from fracture mechanics test) have been determined on an API 5L X65 pipeline steel. These transition temperatures have been reported versus a constraint parameter, e.g. T-stress, in a master curve. Differences between different brittle-ductile transition temperatures and temperature corresponding to T-stress acting in a pipe submitted to internal pressure on the master curve, give an estimation of the conservatism of the chosen reference transition temperature.

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“…Constraint effect can be represented by stress triaxiality, Q parameter [10,11] or T-stress [12]. Here constraint is measured by T-stress which is defined by:…”

Section: Discussionmentioning

confidence: 99%

Design based on ductile–brittle transition temperature for API 5L X65 steel used for dense CO2 transport

Capelle

Furtado

Azari

et al. 2013

Engineering Fracture Mechanics

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“…The procedure extends previous work by Gao et al (1998) and Ruggieri et al (2000) to calibrate the Weibull modulus using high constraint (SSY) and low constraint (LSY) fracture toughness data measured at the same temperature and loading rate. Because each measured -value is corrected to its equivalent -value, the statistical (Weibull) distribution of -values is also corrected to an equivalent statistical (Weibull) distribution of -values.…”

Section: Tsm For Homogeneous Materialsmentioning

confidence: 53%

A micromechanics approach to assess effects of constraint on cleavage fracture toughness: a weibull stress model

Ruggieri¹

2010

J. Braz. Soc. Mech. Sci. & Eng.

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“…where parameter m most often takes a value in the range 10-22 for typical structural steels (Beremin 1983;Ruggieri and Dodds 1996a,b;Ruggieri 2001Ruggieri , 2009aBakker and Koers 1991;Gao et al 1998;Ruggieri et al 2000;Gao et al 1999). To make contact with previously developed probabilistic models adopting the σ w concept and to aid development of the scaling model described next, the above Eq.…”

Section: The Weibull Stress Model For Strength Mismatched Weldsmentioning

confidence: 99%

“…The following steps summarize the key procedures in the calibration of parameter m based uponσ w -based scaling curves to correct toughness values for effects of weld strength mismatch derived from two data sets. The approach builds upon previous calibration strategy for homogeneous materials introduced by Gao et al (1998) and Ruggieri et al (2000), and remains applicable for other macroscopic measures of loading, such as CTOD. The next sections illustrate a validation study of the process for an API X80 girth weld.…”

Section: Weibull Modulus Calibrationmentioning

confidence: 99%

“…Weld Specimens (Beremin 1983;Ruggieri and Dodds 1996a,b;Ruggieri 2001Ruggieri , 2009aBakker and Koers 1991;Gao et al 1998;Ruggieri et al 2000;Gao et al 1999). Each curve provides pairs of J-values, J Even for the baseplate SE(B) specimen (evenmatch condition with M y = 1.0) and J Over for the overmatch SE(B) specimen, that produce the sameσ w (see Fig.…”

Section: Toughness Correction Curves For Mismatchedmentioning

confidence: 99%

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An engineering methodology to assess effects of weld strength mismatch on cleavage fracture toughness using the Weibull stress approach

Ruggieri

2010

Int J Fract

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This work describes the development of an engineering approach based upon a toughness scaling methodology incorporating the effects of weld strength mismatch on crack-tip driving forces. The approach adopts a nondimensional Weibull stress,σ w , as a the near-tip driving force to correlate cleavage fracture across cracked weld configurations with different mismatch conditions even though the loading parameter (measured by J ) may vary widely due to mismatch and constraint variations. Application of the procedure to predict the failure strain for an overmatch girth weld made of an API X80 pipeline steel demonstrates the effectiveness of the micromechanics approach. Overall, the results lend strong support to use a Weibull stress based procedure in defect assessments of structural welds.

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Transferability of elastic–plastic fracture toughness using the Weibull stress approach: significance of parameter calibration

Cited by 64 publications

References 16 publications

Design based on ductile–brittle transition temperature for API 5L X65 steel used for dense CO2 transport

Design based on ductile–brittle transition temperature for API 5L X65 steel used for dense CO2 transport

A micromechanics approach to assess effects of constraint on cleavage fracture toughness: a weibull stress model

An engineering methodology to assess effects of weld strength mismatch on cleavage fracture toughness using the Weibull stress approach

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