The effect of ductile crack growth on the temperature dependence of cleavage fracture toughness for a RPV steel with various degrees of embrittlement

Марголин, Б. З.; Kostylev, V. I.; Minkin, A. J.

doi:10.1016/s0308-0161(03)00046-2

Cited by 16 publications

(11 citation statements)

References 15 publications

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“…Besides the Unified Curve method [34,35], the Prometey model was used also for the elaboration of a calculation procedure for K T Jc ( ) in brittle fracture upon ductile crack increment [47], a method for predicting fracture toughness in nonisothermal and nonmonotonic loading [48], an engineering procedure to allow for the influence of biaxial loading on K Jc [49]. Using this model, some investigations were carried out to assess the effect of short cracks on the function K T Jc ( ) [31,32].…”

Section: Model Applicationmentioning

confidence: 99%

Brittle fracture local criterion and radiation embrittlement of reactor pressure vessel steels

et al. 2010

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The application of local criteria for predicting brittle fracture of reactor pressure vessel steels is discussed with an emphasis on radiation embrittlement. An association of the radiation-induced damages and the processes of initiation and propagation of cleavage microcracks is analyzed from the standpoint of the local criterion for fracture. Physical-mechanical models are put forward to describe the influence of radiation damages on the cleavage microcrack initiation. The influence of the material hardening caused by neutron irradiation and plastic deformation on the fracture toughness is studied.Introduction. The intensive development of the local criterion over the last three decades has been caused mostly by the need for adequate prediction of fracture toughness of irradiated materials of nuclear reactor pressure vessels. It is common knowledge that embrittlement of reactor pressure vessel (RPV) materials is assessed by the test results for surveillance specimens. The surveillance specimen programs usually involve irradiation and testing of small-sized specimens only. It has been also known that to determine the temperature dependence of fracture toughness K T Jc ( ) one should perform tests on sufficiently large specimens (full-size specimens) over a wide temperature range. Thus, there arises a problem in principle: how to determine K T Jc ( ) for an irradiated steels from the test results for small-size specimens.The most promising solution to this problem is to use a so-called local approach to predicting fracture toughness of irradiated RPV materials. The local approach can be defined as a method of predicting fracture characteristics on the macrolevel in terms of mechanical parameters using a local criterion for fracture. Clearly, the local approach is based on the local criterion for brittle fracture. The critical parameters involved in the criterion can be related, in principle, to the physical mechanisms of initiation and propagation of microdamages, in this case the cleavage microcracks.At present, there are several available definitions of the local criterion for brittle fracture. The conventional one is written as [1][2][3][4][5][6] σ σ

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Section: Model Applicationmentioning

confidence: 99%

Brittle fracture local criterion and radiation embrittlement of reactor pressure vessel steels

et al. 2010

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“…Now it is known as the Prometey model [13,20,21]. This model has been demonstrated to allow an adequate prediction of the K T c I ( ) function for variously embrittled RPV materials [20,22].…”

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“…In view of criterion (3) and the condition that the fracture probability for each unit cell cannot decrease, the Weibull stress can be calculated as follows [21]: Thus, formulas (16)-(18) allow calculation of the brittle fracture probability for the case of non-isothermal non-monotonic loading. It should be emphasized that for the case of isothermal monotonic loading expression (16) is rearranged to the respective form for σ nuc [16,17].…”

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confidence: 99%

“…The temperature-independent parametersσ d and η in (17) were determined by maximum-likelihood technique [26] using fracture toughness test data obtained at one temperature [20][21][22]. In [21], the above parameters were found from the results of testing 2Ò-ÑÒ specimens at T = −°60 Ñ for the steel in the initial state and T =°50 Ñ for the embrittled steel.…”

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confidence: 99%

“…In [21], the above parameters were found from the results of testing 2Ò-ÑÒ specimens at T = −°60 Ñ for the steel in the initial state and T =°50 Ñ for the embrittled steel. The following values were obtained:σ d = 17,235 MPa, η = 5.96 for the initial state and σ d = 3600 MPa, η =12 for the embrittled state.…”

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Probabilistic definition of local criterion for brittle fracture under complex thermomechanical loading

2005

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The new local criterion for brittle fracture in probabilistic definition, which was used by the authors earlier for the K Ic (T) prediction, is modified for the case of non-isothermal non-monotonic loading. An approach is put forward which allows predicting the brittle fracture probability for cracked elements under complex thermomechanical loading typical, for example, of the case of emergency cooldown of a reactor pressure vessel. The approach has been verified by comparing the calculated and experimental data of assessment of the influence of various thermomechanical pre-loading modes on the fracture toughness of reactor pressure vessel steels.

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Assessment of effect of ductile tearing on cleavage failure probability in ductile to brittle transition region

2017

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The effect of ductile crack growth on the temperature dependence of cleavage fracture toughness for a RPV steel with various degrees of embrittlement

Cited by 16 publications

References 15 publications

Brittle fracture local criterion and radiation embrittlement of reactor pressure vessel steels

Brittle fracture local criterion and radiation embrittlement of reactor pressure vessel steels

Probabilistic definition of local criterion for brittle fracture under complex thermomechanical loading

Assessment of effect of ductile tearing on cleavage failure probability in ductile to brittle transition region

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