Host: The Japan Society of Mechanical Engineers
Name : The 30th International Conference on Nuclear Engineering (ICONE30)
Date : May 21, 2023 - May 26, 2023
Nuclear graphite has several levels of structural complexity at different scales. The effect of temperature and irradiation on graphite properties depends not only on the current structure but also on smaller scales. Therefore, some mechanism issues need to be studied across different scales. To investigate the effect of changes in microscopic properties on polycrystalline and bulk, a cross-scale modeling approach connecting molecular dynamics model and finite element model has been constructed in this work. The molecular dynamics method was used to evaluate the effects of temperature and irradiation on the structures and properties of graphite crystallite. The finite element method was then used to develop a continuous medium model for microcrack free graphite polycrystalline, assigning the properties of the crystallite to the polycrystalline model. In the microcrack free polycrystalline model, the effects of polycrystalline texture and crystallite properties are coupled. Therefore, the model response to external environmental factors may be of great complexity. In this way, the effects of temperature and irradiation on the properties of microcrack free polycrystalline can be evaluated in terms of crystallite properties.
