Modelling Crack Propagation in AGR Graphite Bricks in Code_Aster Using the eXtended Finite Element Method
Modelling Crack Propagation in AGR Graphite Bricks in Code_Aster Using the eXtended Finite Element Method
复制标题
使用扩展有限元法在 Code_Aster 中对 AGR 石墨砖中的裂纹扩展进行建模
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
L. Pellet
中科院分区：
文献类型：
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作者：
P. Martinuzzi;L. Pellet
Demonstrating the structural capacity of graphite cores of Advanced Gascooled Reactors (AGR) is essential for their operation. The Plant Life Extension programme of EDF Energy Nuclear Generation aims at supporting the lifetime extension of power plants. In that scope, the understanding and evaluation of both crack initiation and crack propagation in the particular case of graphite bricks is a key point. The present paper focuses on crack propagation using the eXtended Finite Element Method (X-FEM) in Code_Aster. A first study aims at determining the capabilities and the limits of this method. Mesh dependency, and the accuracy of the calculation of the Stress Intensity Factors (SIF) and the strain energy release rate, which have a major role in crack propagation, are studied. Then, propagation criteria adapted to quasistatic brittle cracking are tested. Three gradually complex test cases are identified, studied, and compared with experimental results made on an un-irradiated graphite brick in order to validate the propagation criteria and their robustness. The influence of both the propagation criteria and the initial crack shape on the crack path is analysed.
