A 3D full-field study of cracks in a nuclear graphite under mode I and mode II cyclic dwell loading conditions

Tim Wigger; Bing Lin; Colin Lupton; James Marrow; Jie Tong

doi:10.1111/ffe.13183

A 3D full-field study of cracks in a nuclear graphite under mode I and mode II cyclic dwell loading conditions

Tim Wigger, Bing Lin, Colin Lupton, James Marrow, Jie Tong

University of Oxford

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Abstract

3D full-field deformation around crack tips in a nuclear graphite has been studied under mode I and mode II cyclic dwell loading conditions using Digital Volume Correlation (DVC) and integrated finite element (FE) analysis. A cracked Brazilian disk specimen of Gilsocarbon graphite was tested at selected loading angles to achieve mode I and mode II cyclic dwell loading conditions. Integrated FE analysis was carried out with the three-dimensional displacement fields measured by DVC injected into the FE model, from which the crack driving force J-integral was obtained using a damaged plasticity material model. The evolution of near-tip strains and the J-integral during the cyclic dwell loading was examined. Under cyclic dwell, residual strain accumulation was observed for the first time. The results shed some light on the effect of dwell time on the 3D crack deformation and crack driving force in Gilsocarbon under cyclic mode I and II loading conditions.

Original language	English
Number of pages	12
Journal	Fatigue & Fracture of Engineering Materials & Structures
Early online date	22 Dec 2019
DOIs	https://doi.org/10.1111/ffe.13183
Publication status	Early online - 22 Dec 2019

Keywords

cyclic loading
DVC
dwell
graphite
mode I
mode II
residual strain
strain accumulation

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10.1111/ffe.13183

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This is the peer reviewed version of the following article: Wigger, T, Lin, B, Lupton, C, Marrow, J, Tong, J. A 3D full‐field study of cracks in a nuclear graphite under mode I and mode II cyclic dwell loading conditions. Fatigue Fract Eng Mater Struct. 2019; 1– 12, which has been published in final form at https://doi.org/10.1111/ffe.13183. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Accepted author manuscript (Post-print), 1.4 MB

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title = "A 3D full-field study of cracks in a nuclear graphite under mode I and mode II cyclic dwell loading conditions",

abstract = "3D full-field deformation around crack tips in a nuclear graphite has been studied under mode I and mode II cyclic dwell loading conditions using Digital Volume Correlation (DVC) and integrated finite element (FE) analysis. A cracked Brazilian disk specimen of Gilsocarbon graphite was tested at selected loading angles to achieve mode I and mode II cyclic dwell loading conditions. Integrated FE analysis was carried out with the three-dimensional displacement fields measured by DVC injected into the FE model, from which the crack driving force J-integral was obtained using a damaged plasticity material model. The evolution of near-tip strains and the J-integral during the cyclic dwell loading was examined. Under cyclic dwell, residual strain accumulation was observed for the first time. The results shed some light on the effect of dwell time on the 3D crack deformation and crack driving force in Gilsocarbon under cyclic mode I and II loading conditions.",

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AU - Wigger, Tim

AU - Lin, Bing

AU - Lupton, Colin

AU - Marrow, James

AU - Tong, Jie

PY - 2019/12/22

Y1 - 2019/12/22

N2 - 3D full-field deformation around crack tips in a nuclear graphite has been studied under mode I and mode II cyclic dwell loading conditions using Digital Volume Correlation (DVC) and integrated finite element (FE) analysis. A cracked Brazilian disk specimen of Gilsocarbon graphite was tested at selected loading angles to achieve mode I and mode II cyclic dwell loading conditions. Integrated FE analysis was carried out with the three-dimensional displacement fields measured by DVC injected into the FE model, from which the crack driving force J-integral was obtained using a damaged plasticity material model. The evolution of near-tip strains and the J-integral during the cyclic dwell loading was examined. Under cyclic dwell, residual strain accumulation was observed for the first time. The results shed some light on the effect of dwell time on the 3D crack deformation and crack driving force in Gilsocarbon under cyclic mode I and II loading conditions.

AB - 3D full-field deformation around crack tips in a nuclear graphite has been studied under mode I and mode II cyclic dwell loading conditions using Digital Volume Correlation (DVC) and integrated finite element (FE) analysis. A cracked Brazilian disk specimen of Gilsocarbon graphite was tested at selected loading angles to achieve mode I and mode II cyclic dwell loading conditions. Integrated FE analysis was carried out with the three-dimensional displacement fields measured by DVC injected into the FE model, from which the crack driving force J-integral was obtained using a damaged plasticity material model. The evolution of near-tip strains and the J-integral during the cyclic dwell loading was examined. Under cyclic dwell, residual strain accumulation was observed for the first time. The results shed some light on the effect of dwell time on the 3D crack deformation and crack driving force in Gilsocarbon under cyclic mode I and II loading conditions.

KW - cyclic loading

KW - DVC

KW - dwell

KW - graphite

KW - mode I

KW - mode II

KW - residual strain

KW - strain accumulation

U2 - 10.1111/ffe.13183

DO - 10.1111/ffe.13183

M3 - Article

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JO - Fatigue & Fracture of Engineering Materials & Structures

JF - Fatigue & Fracture of Engineering Materials & Structures

ER -

A 3D full-field study of cracks in a nuclear graphite under mode I and mode II cyclic dwell loading conditions

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Keywords

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