Fracture toughness predictions for a reactor pressure vessel steel in the initial and highly embrittled states with the Master Curve approach and a probabilistic model

Марголин, Б. З.; Shvetsova, V. A.; Gulenko, A. G.; Ilyin, A. V.; Николаев, В. А.; Smirnov, V. I.

doi:10.1016/s0308-0161(02)00006-6

Cited by 26 publications

(32 citation statements)

References 12 publications

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“…After the above-mentioned steels and weld metals had been subjected to a typical heat treatment, their physical-mechanical properties became the same as those of RPV materials in their initial state. Therefore, it was advisable to additionally study two steel grades (15Kh2MFA and 15Kh2NMFA-A) with a high degree of embrittlement achieved through a special heat treatment [19]. This was assumed to simulate, to a certain extent, the state of an irradiated material.…”

Section: Test Specimen Types and Materialsmentioning

confidence: 99%

“…Table 1 summarizes the chemical composition of the test materials as well as their yield strengths at room temperature and the ductile-brittle transition temperatures T 41J as obtained on Charpy type impact test specimens by the fracture energy criterion E a = 41 J with E T a ( ) approximated by a hyperbolic tangent function. Table 1 gives also the data on the reference temperature T 0 and calibration parameter Ω determined based on fracture toughness testing of compact C(T) type specimens of thickness 16-50 mm either in this study or earlier [19].…”

Section: Test Specimen Types and Materialsmentioning

confidence: 99%

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Analysis of applicability of small-sized specimens to prediction of temperature dependence of fracture toughness

et al. 2009

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The paper addresses the use of small-sized specimens of various types, including those with deep (50%) side grooves, for the purpose of fracture toughness prediction. The experimental data for numerous (more than 500) small-sized specimens prepared from materials of various degrees of embrittlement are compared to the test results for full-sized specimens of Ñ(Ò) type. The concepts of Master Curve and Unified Curve are applied for the processing of experimental data. To handle the test results for small-sized deep-grooved specimens a calculation procedure has been elaborated, which adjusts the calculation method specified in the ASTM Standard Å 1921. We provide recommendations of how to use precracked Charpy type deep-grooved (50%) specimens for prediction of a representative temperature dependence of fracture toughness.Introduction. Direct knowledge of the temperature dependence of fracture toughness for a structural steel represents a date source needed for theoretical assessment of reactor pressure vessel integrity during the operation of a nuclear power plant. The applicable standards and codes [1, 2] call for a systematic inspection of the material critical properties within mandatory reference-specimen programs for reactor pressure vessels. In most cases, Charpy V-notch specimens for bending impact tests are used as reference specimens for the determination of brittle fracture resistance. Fracture toughness is usually determined based on the use of precracked Charpy specimens.At present, several methods are available for predicting the temperature dependence of fracture toughness for reactor pressure vessels; noteworthy among them are the Master Curve (MC) method [3,4] and the Unified Curve (UC) method [7,8], which were proposed based on a probabilistic model for the fracture toughness prediction [5,6]. The last-mentioned method allows for a change in trend of the K T Jc ( ) curve with increasing degree of embrittlement of a material. Both methods predict the K T Jc ( ) function for any preset fracture probability and specimen thickness by using test data on standard specimens. The requirements for these tests as well as the procedure of conversion for a preset fracture probability P f = 0 5. and reference specimen thickness B = 25 mm, if the test data were obtained on specimens of arbitrary thickness, are as per ASTM Standard E 1921-02 [3]. This standard implies usage of side-grooved specimens with a groove depth up to 25% of the specimen overall thickness (recommended groove depth is 20%). In practice, tests are performed both on the side-grooved specimens with a groove depth of 20%, as well as on the specimens with no grooves.

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Section: Test Specimen Types and Materialsmentioning

confidence: 99%

Section: Test Specimen Types and Materialsmentioning

confidence: 99%

Analysis of applicability of small-sized specimens to prediction of temperature dependence of fracture toughness

et al. 2009

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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]. The calibration of the model (i.e., determination of input parameters for it) can be performed on the basis of the fracture toughness data obtained at a single temperature.…”

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confidence: 99%

“…In [16,17] a local criterion for brittle fracture was formulated for the case of isothermal monotonic loading. The essential concepts of the Prometey model based on this local criterion are detailed below [22].…”

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confidence: 99%

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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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Radiation embrittlement modelling in multi-scale approach to brittle fracture of RPV steels

2012

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Fracture toughness predictions for a reactor pressure vessel steel in the initial and highly embrittled states with the Master Curve approach and a probabilistic model

Cited by 26 publications

References 12 publications

Analysis of applicability of small-sized specimens to prediction of temperature dependence of fracture toughness

Analysis of applicability of small-sized specimens to prediction of temperature dependence of fracture toughness

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

Radiation embrittlement modelling in multi-scale approach to brittle fracture of RPV steels

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