Study on failure mechanism of line contact structures of nuclear graphite

Jia Shigang; Yi Yanan; Wang Lu; Liu Guangyan; Ma Qinwei; Sun Libin; Shi Li; Ma Shaopeng

doi:10.1016/j.net.2022.03.018

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자료유형: 학술저널

저자정보: Jia Shigang (School of Aerospace Engineering, Beijing Institute of Technology) Yi Yanan (Department of Engineering Mechanics, Shanghai Jiaotong University) Wang Lu (School of Aerospace Engineering, Beijing Institute of Technology) Liu Guangyan (School of Aerospace Engineering, Beijing Institute of Technology) Ma Qinwei (School of Aerospace Engineering, Beijing Institute of Technology) Sun Libin (Institute of Nuclear and New Energy Technology, Tsinghua University) Shi Li (Institute of Nuclear and New Energy Technology, Tsinghua University) Ma Shaopeng (School of Aerospace Engineering, Beijing Institute of Technology)

저널정보: 한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제54권 제8호

발행연도: 2022.8

수록면: 2,989 - 2,998 (10page)

DOI: 10.1016/j.net.2022.03.018

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Line contact structures, such as the contact between graphite brick and graphite tenon, widely exist in high-temperature gas-cooled reactors. Due to the stress concentration effect, the line contact area is one of the dangerous positions prone to failure in the nuclear reactor core. In this paper, the failure mechanism of line contact structures composed of IG11 nuclear graphite column and brick were investigated by means of experiment and finite element simulation. It was found that the failure process mainly includes three stages: firstly, the damage accumulation in nuclear graphite material led to the characteristic yielding of the line contact structure, but no macroscopic failure can be observed at this stage; secondly, the stresses near the contact area met Mohr failure criterion, and a crack initiated and propagated laterally in the contact zone, that is, local macroscopic failure occurred at this stage; finally, a second crack initiated in the contact area and developed in to a Y-shape, resulting in the final failure of the structure. This study lays a foundation for the structural design and safety assessment of hightemperature gas-cooled reactors

#Nuclear graphite #Line contact structure #Damage #Failure mechanism

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