A new statistical local criterion for cleavage fracture in steel. Part II: application to an offshore structural steel

Bordet, S.R.; Karstensen, A. D.; Knowles, David; Wiesner, C.S.

doi:10.1016/j.engfracmech.2004.02.010

Cited by 59 publications

(16 citation statements)

References 18 publications

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“…These results predicted by criterion (8) are confirmed to a larger degree by fractographic examination of fracture surfaces. 37,38 The local criterion of cleavage fracture for irradiated condition When considering the applicability of local cleavage fracture criterion for irradiated RPV materials, the following should be kept in mind . It is known that for RPV materials, irradiation affects the yield stress σ Y and does not affect the critical brittle fracture stress S C (at least, for transcrystalline cleavage fracture).…”

Section: Verification Of the Proposed Criterionmentioning

confidence: 99%

Application of a new cleavage fracture criterion for fracture toughness prediction for RPV steels

Марголин

Shvetsova

Gulenko

et al. 2006

Fatigue Fract Eng Mat Struct

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A B S T R A C T In the present paper, approaches for prediction of cleavage fracture proposed by authors over recent years are briefly reviewed. A new local criterion of cleavage fracture and its application are considered. Local criterion of cleavage fracture formulated in a probabilistic manner consists of cleavage microcrack nucleation condition and condition for their start and propagation through various barriers such as microstresses, grain and dislocation substructure boundaries. As distinct from universally accepted criterion in which microcrack nucleation occurs on the plastic deformation beginning (σ eq = σ Y ), cleavage microcrack nucleation according to the formulated condition depends on the maximum principal stress, plastic strain and temperature.On the basis of the proposed criterion, a probabilistic model for fracture toughness prediction (known now as Prometey model) was developed and verified by application to reactor pressure vessels (RPV) materials in the initial, moderately irradiated and highly embrittled states. The Prometey model and other applications of the proposed criterion are briefly considered. The predicted results are compared with test results and the Master Curve.Intensive development of local approach models over the past 30 years was stimulated, to a great extent, by the needs of assessing the structural integrity of reactor pressure vessels (RPV). A key input to calculation of the structural integrity of the RPV is known to be the fracture toughness of a material. It is important to determine how fracture toughness varies as a function of temperature, and how the fracture toughness versus temperature response changes with in-service material degradation due to irradiation.The neutron irradiation damage effect on RPV materials is estimated using data which are obtained from surveillance programs. These surveillance programs include irradiation and testing of small-sized specimens only. On the other hand, as it is well known, adequate determination of fracture toughness over wide temperature range requires full-sized specimen testing. Thus, the major problem arises how to predict the fracture toughness versus temperature curve, K IC (T) or K JC (T), for an irradiated steel on the basis of small-sized specimen testing.The application of a local approach for fracture toughness prediction in irradiated RPV materials appears to be the most promising way to solve this problem. This explains the reason why local approach models are now intensively developed.Currently, there are several brittle fracture models under development. These include the RKR model 1,2 and the Beremin model. 3 However, it was shown in 4,5 that fracture toughness prediction for irradiated RPV steels on the basis of the RKR and Beremin models is not correct. According to these models, the temperature dependence of fracture toughness K JC (T) is mainly determined by the temperature dependence of the yield stress σ Y (T). For RPV steels over the service temperature range 20 • C ≤ T ≤ 300 • C, the yield stress vari...

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Section: Verification Of the Proposed Criterionmentioning

confidence: 99%

Application of a new cleavage fracture criterion for fracture toughness prediction for RPV steels

Марголин

Shvetsova

Gulenko

et al. 2006

Fatigue Fract Eng Mat Struct

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“…However, a general trend has appeared in the last decades that consists in an empirical enrichment of the local approach fracture criterion originally proposed by the Beremin work-group [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

A micromechanical interpretation of the temperature dependence of Beremin model parameters for french RPV steel

Mathieu

Inal

Berveiller

et al. 2010

Journal of Nuclear Materials

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International audienceLocal approach to brittle fracture for low-alloyed steels is discussed in this paper. A bibliographical introduction intends to highlight general trends and consensual points of the topic and evokes debatable aspects. French RPV steel 16MND5 (equ. ASTM A508 Cl.3), is then used as a model material to study the influence of temperature on brittle fracture. A micromechanical modelling of brittle fracture at the elementary volume scale already used in previous work is then recalled. It involves a multiscale modelling of microstructural plasticity which has been tuned on experimental inter-phase and inter-granular stresses heterogeneities measurements. Fracture probability of the elementary volume can then be computed using a randomly attributed defect size distribution based on realistic carbides repartition. This defect distribution is then deterministically correlated to stress heterogeneities simulated within the microstructure using a weakest-link hypothesis on the elementary volume, which results in a deterministic stress to fracture. Repeating the process allows to compute Weibull parameters on the elementary volume. This tool is then used to investigate the physical mechanisms that could explain the already experimentally observed temperature dependence of Beremin's parameter for 16MND5 steel. It is showed that, assuming that the hypothesis made in this work about cleavage micro-mechanisms are correct, effective equivalent surface energy (i.e. surface energy plus plastically dissipated energy when blunting the crack tip) for propagating a crack has to be temperature dependent to explain Beremin's parameters temperature evolution

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“…in the past, [14][15][16][17][18][19] because it enables a quantitative evaluation of the scatter and size effect of structure on fracture toughness. However, these models are generally not intended to quantitatively predict fracture toughness caused by the microstructural factors, because they adopted the parameters for adjusting the experimental results of fracture toughness tests.…”

Section: D Observation Of Micro-cracks As Cleavage Fracture Initiatimentioning

confidence: 99%

3D Observation of Micro-cracks as Cleavage Fracture Initiation Site in Ferrite-pearlite Steel

et al. 2017

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A new statistical local criterion for cleavage fracture in steel. Part II: application to an offshore structural steel

Cited by 59 publications

References 18 publications

Application of a new cleavage fracture criterion for fracture toughness prediction for RPV steels

Application of a new cleavage fracture criterion for fracture toughness prediction for RPV steels

A micromechanical interpretation of the temperature dependence of Beremin model parameters for french RPV steel

3D Observation of Micro-cracks as Cleavage Fracture Initiation Site in Ferrite-pearlite Steel

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