Local Approach to Fracture Applied to Reactor Pressure Vessel : Synthesis of a Cooperative Programme Between EDF, CEA, Framatome and AEA

Moinereau, Dominique; Frund, J.M.; Brochard, J.; Marini, B.; Joly, Pierre; Guichard, D.; Bhandari, S.; Sherry, Andrew H.; Sanderson, David J.; Lidbury, David

doi:10.1051/jp4:1996624

Cited by 11 publications

(2 citation statements)

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“…This is the so-called methodology of the local approach to fracture. These models apply to either ductile tearing or cleavage fracture [26][27][28]. Each model has shown good capacity of prediction as long as only one mechanism is involved.…”

Section: Introductionmentioning

confidence: 99%

Ductile to brittle transition of an A508 steel characterized by Charpy impact test

Tanguy

Besson

Piques

et al. 2005

Engineering Fracture Mechanics

165

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This study is devoted to the ductile-brittle transition behavior of a French A508 Cl3 (16MND5) steel. Due to its importance for the safety assessment of PWR vessels, a full characterization of this steel with Charpy V-notch test in this range of temperature was undertaken. The aim of this study is to provide a wide experimental database and microstructural observations to supply, calibrate and validate models used in a local approach methodology. Mechanical and fracture properties of the steel have been investigated over a wide range of temperatures and strain rates. Effects of impact velocity on ductile-brittle transition curve, on ductile tearing and on notch temperature rise are presented and discussed. A detailed study of ductile crack initiation and growth in Charpy specimens is also carried out. From fractographic investigations of the microvoids nucleation around carbide second phase particles, a plastic strain threshold for nucleation is determined for this material. A508 Cl3 steels undergo a transition in fracture toughness properties with temperature, due to a change in fracture mode from microvoids colaescence to cleavage fracture. A systematic investigation on the nature and the position of cleavage triggering sites and on any change in the ductile to brittle transition (DBT) range has been carried out. This leads to the conclusion that Manganese sulfide inclusions do not play an increasing role with increasing test temperature as recently mentionned in other studies on A508 Cl3 steel with a higher sulfur content. In a companion paper [1], the numerical simulation of the Charpy test in the ductile-brittle transition range using fully coupled local approach to fracture is presented.

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Section: Introductionmentioning

confidence: 99%

Ductile to brittle transition of an A508 steel characterized by Charpy impact test

Tanguy

Besson

Piques

et al. 2005

Engineering Fracture Mechanics

165

View full text Add to dashboard Cite

show abstract

“…Because Weibull stress models employ only two (or three) parameters to describe the cleavage triggering event, the potential dependencies of the Weibull stress parameters on temperature, loading rate, irradiation, pre‐straining, etc., remain largely open issues. Mudry 19 discusses this topic in qualitative terms and more recent efforts 20 , 21 provide quantitative (but not consistent) insight into temperature effects. After completion of the work described here, we learned of a simultaneous, similar study by Minami et al ., 22 , 23 who investigated the effects of pre‐straining and dynamic loading on cleavage fracture toughness of a moderate strength steel ( σ ys = 325 MPa).…”

Section: Introductionmentioning

confidence: 99%

Weibull stress model for cleavage fracture under high‐rate loading

Gao

Dodds

Tregoning

et al. 2001

Fatigue Fract Eng Mat Struct

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This paper examines the effects of loading rate on the Weibull stress model for prediction of cleavage fracture in a low‐strength, A515‐70 pressure vessel steel. Interest focuses on low‐to‐moderate loading rates (K˙I < 2500 MPa √m s−1 ). Shallow cracked SE(B) specimens were tested at four different loading rates for comparison with previous quasi‐static tests on shallow notch SE(B)s and standard C(T)s. To utilize these dynamic experimental data, we assume that the Weibull modulus (m) previously calibrated using quasi‐static data remains invariant over the loading rates of interest. The effects of dynamic loading on the Weibull stress model enter through the rate‐sensitive material flow properties, the scale parameter (σu ) and the threshold Weibull stress (σw‐min ). Rate‐sensitive flow properties are modelled using a viscoplastic constitutive model with uniaxial, tension stress–plastic strain curves specified at varying plastic strain rates. The analyses examine dependencies of σw‐min and σu on K˙I . Present results indicate that σw‐min and σu are weak functions of loading rate K˙I for this pressure vessel steel. However, the predicted cumulative probability for cleavage exhibits a strong sensitivity to σu and, consequently, the dependency of σu on K˙I is sufficient to preclude use of the static σu value for high loading rates.

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Coupling of the Weibull stress model and macroscale models to predict cleavage fracture

Petti

Dodds

2004

Engineering Fracture Mechanics

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Local Approach to Fracture Applied to Reactor Pressure Vessel : Synthesis of a Cooperative Programme Between EDF, CEA, Framatome and AEA

Cited by 11 publications

References 0 publications

Ductile to brittle transition of an A508 steel characterized by Charpy impact test

Ductile to brittle transition of an A508 steel characterized by Charpy impact test

Weibull stress model for cleavage fracture under high‐rate loading

Coupling of the Weibull stress model and macroscale models to predict cleavage fracture

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