Numerical Modeling of Fracture Toughness in RPV Steel Containing Segregated Zones

Naudin, C.; Pineau, A.; Frund, J.M.

doi:10.1115/pvp2002-1333

Cited by 2 publications

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“…A 508 steel. Scatter in fracture toughness tests (Naudin et al, 2001). Equations (14) and (22) contain only two independent parameters, as shown previously.…”

Section: Small-scale Yielding Conditionsmentioning

confidence: 99%

Development of the Local Approach to Fracture over the Past 25 years: Theory and Applications

Pineau

2006

Int J Fract

173

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This review paper is devoted to the local approach to fracture (LAF) for the prediction of the fracture toughness of structural steels. The LAF has been considerably developed over the past two decades, not only to provide a better understanding of the fracture behaviour of materials, in particular the failure micromechanisms, but also to deal with loading conditions which cannot easily be handled with the conventional linear elastic fracture mechanics and elastic-plastic fracture mechanics global approaches. The bases of this relatively newly developed methodology are first presented. Both ductile rupture and brittle cleavage fracture micromechanisms are considered. The ductile-to-brittle transition observed in ferritic steels is also briefly reviewed. Two types of LAF methods are presented: (i) those assuming that the material behaviour is not affected by damage (e.g. cleavage fracture), (ii) those using a coupling effect between damage and constitutive equations (e.g. ductile fracture). The micromechanisms of brittle and ductile fracture investigated in elementary volume elements are briefly presented. The emphasis is laid on cleavage fracture in ferritic steels. The role of second phase particles (carbides or inclusions) and grain boundaries is more thoroughly discussed. The distinction between nucleation and growth controlled fracture is made. Recent developments in the theory of cleavage fracture incorporating both the effect of stress state and that of plastic strain are presented. These theoretical results are applied to the crack tip situation to predict the fracture toughness. It is shown that the ductile-to-brittle transition curve can reasonably be well predicted using the LAF approach. Additional applications of the LAF approach methods are also shown, including: (i) the effect of loading rate and prestressing; (ii) the influence of residual stresses in welds; (iii) the mismatch effects in welds; (iv) the warm-prestressing effect. An attempt is also made to delineate research areas where large improvements should be made for a better understanding of the failure behaviour of structural materials.

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“…A 508 steel. Scatter in fracture toughness tests (Naudin et al, 2001). Equations (14) and (22) contain only two independent parameters, as shown previously.…”

Section: Small-scale Yielding Conditionsmentioning

confidence: 99%

Development of the Local Approach to Fracture over the Past 25 years: Theory and Applications

Pineau

2006

Int J Fract

173

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“…Influence of macroscopic variation was recently reported using full size vessel products and trepans from pressure vessels of decommissioned plants. Influence of macro-segregation in ingots on fracture toughness was examined in French A508 forged rings and the scatter of surveillance transition temperature shifts and some high shifts data were explained by C macro-segregation in ingots [163,164]. Other studies showed that the master curve reference temperature at the surface of unirradiated actual VVER440 pressure vessel steels was 35-70 • C lower than those of the mid-thickness region and that this difference came from the microstructural difference induced by cooling rates [165].…”

Section: Fracture Toughnessmentioning

confidence: 99%

Current understanding of radiation-induced degradation in light water reactor structural materials

Fukuya¹

2013

Journal of Nuclear Science and Technology

161

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Current phenomenological knowledge and understanding of mechanisms are reviewed for radiation embrittlement of reactor pressure vessel low alloy steels and irradiation assisted stress corrosion cracking of core internals of stainless steels. Accumulated test data of irradiated materials in light water reactors and microscopic analyses by using state-of-the-art techniques such as a three-dimensional atom probe and electron backscatter diffraction have significantly increased knowledge about microstructural features. Characteristics of solute clusters and deformation microstructures and their contributions to macroscopic material property changes have been clarified to a large extent, which provide keys to understand in the degradation mechanisms. However, there are still fundamental research issues that merit study for long-term operation of reactors that requires reliable quantitative prediction of radiation-induced degradation of component materials in low-dose rate high-dose conditions.

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Numerical Modeling of Fracture Toughness in RPV Steel Containing Segregated Zones

Cited by 2 publications

References 0 publications

Development of the Local Approach to Fracture over the Past 25 years: Theory and Applications

Development of the Local Approach to Fracture over the Past 25 years: Theory and Applications

Current understanding of radiation-induced degradation in light water reactor structural materials

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