Scale factor of standard and mini Charpy specimens from VVER-1000 RPV materials

Chernobaeva, A. A.; Medvedev, K. I.; Zhurko, D. A.; Kostromin, V. N.; Skundin, M. A.; Erak, D.; Mikhin, O.V.

doi:10.1016/j.ijpvp.2016.06.005

Cited by 8 publications

(2 citation statements)

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“…Considering the geometry constraint effect that the nonstandard MTP specimen has, it is necessary to perform data correlation between the standard and nonstandard small-sized specimens prior to the fatigue testing [53][54][55] ; otherwise, the displacement applied to the MTP specimen will be under-or overestimated, leading to many errors in duplicating the SSFS response. According to the latest literature review, the authors have not yet noticed any published work on this topic using finite element (FE) coupled with an advanced mechanics-based material law to determine the scaling factor, especially in high-temperature LCF testing.…”

Section: Constitutive Equationsmentioning

confidence: 99%

A miniaturized thin‐plate low cycle fatigue test method at elevated temperature

Maskill

Zhou

et al. 2022

Fatigue Fract Eng Mat Struct

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This study aims to develop a high-temperature low cycle fatigue test method using a nonstandard miniature thin-plate specimen in order to characterize the cyclic viscoplasticity behavior of a component material. For demonstration, fully reversed strain-range controlled low cycle fatigue and creep-fatigue tests at 600 C have been performed for a martensitic steel using standard-sized fullscale specimens and miniaturized thin-plate specimens, respectively. Because the displacement is not directly measured from the uniform gauge section of the miniaturized specimen, a geometry-dependent scaling factor is obtained and used to convert the uniaxial strain. The results obtained are shown that the miniaturized test method developed in this work has exhibited a clear possibility to produce comparable low cycle fatigue data with those that are normally obtained by conventional standard specimen tests.

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Section: Constitutive Equationsmentioning

confidence: 99%

A miniaturized thin‐plate low cycle fatigue test method at elevated temperature

Maskill

Zhou

et al. 2022

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…In consideration of the geometry constraint effect that non-standard specimen has, it is necessary to correctly carry out the correlation evaluation using scaling factor between standard and non-standard small-sized specimens in advance 15,[53][54][55] , otherwise, the applied displacement on MTP specimen for representing SSFS testing data will be under-or over-estimated, leading to a large amount of inaccuracy in cyclic plasticity property evaluation. According to the latest literature review, the authors have not yet noticed any published work on this topic using finite element (FE) modelling approach to evaluate scaling factor based on an advanced mechanics-based material model, especially in high temperature LCF testing for non-standard small-sized thin-plate specimen.…”

Section: Constitutive Equationsmentioning

confidence: 99%

A Miniaturized Thin-Plate Low Cycle Fatigue Test Method at Elevated Temperature

Maskill

Z.X.

et al. 2021

Preprint

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This study aims to develop a high temperature LCF test method using a non-standard miniature thin-plate (MTP) specimen in order to characterize cyclic visco-plasticity behavior of component materials. For demonstration, fully reversed strain-range controlled LCF and creep-fatigue (CF) tests at 600 °C have been performed for a martensitic steel using both standard-sized full-scale (SSFS) and MTP specimens. A scaling factor is determined using cyclic visco-plastic finite element (FE) for geometry constraint evaluation and data conversion based on the reference strain approach. The equivalent energy principal is proposed to assess the geometry constraint effect that non-standard MTP specimen has. The high temperature LCF results from the MTP specimen based on the proposed testing methodology have shown a good agreement with SSFS specimen data under equivalent conditions. The methodology can therefore be used to conduct accurate transferability to achieve equivalent LCF behavior between the conventional standard specimen and the MTP specimen.

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