20th European Conference on Fracture (ECF20) Modelling Crack Growth within Graphite Bricks due to Irradiation and Radiolytic Oxidation
20th European Conference on Fracture (ECF20) Modelling Crack Growth within Graphite Bricks due to Irradiation and Radiolytic Oxidation
复制标题
第 20 届欧洲断裂会议 (ECF20) 模拟石墨砖内由于辐照和辐射氧化导致的裂纹扩展
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
W. Sun
中科院分区：
文献类型：
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作者：
W. Sun
During operation, nuclear graphite structures are exposed to gradients of neutron radiation and temperature. They are also prone to radiolytic oxidation, subsequent porosity changes and weight loss. These processes cause significant changes in the material properties of graphite and create complicated stress fields within graphite bricks. Significant efforts have been made to analyse th ese stresses over recent years. In this paper, the influence of stresses within a typical graphite brick, during operation, on crack g rowth is studied. A finite element (FE) mechanical constitutive model is implemented in ABAQUS as a user-subroutine (UMAT ) in conjunction with a damage model to simulate crack growth within the graphite brick. The damage model is a linear traction separation model and it is applied with XFEM enrichment to model crack initiation and growth. The results indicate that th e cracks initiate in the vicinity of the keyway roots where the maximum principal stress is at its peak. Complete failure was not obse rved from the simulation of the graphite brick under 30 years of irradiation conditions with a maximum brick temperature of 500 o C. Computed stresses and crack lengths were found to be largely dependent on the FE mesh refinement and the results of mesh se nsitivity studies are also presented in this paper.
惰性和氧化环境中辐照的 Gilsocarbon 石墨的弯曲强度模型
影响因子：
3.1
作者：
Eason E
通讯作者：
Eason E