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Multiscale Concrete Modeling of Aging Degradation.
| 题名： | Multiscale Concrete Modeling of Aging Degradation. |
| 作者： | Hammi, Y.; Gullett, P.; Horstemeyer, M. F. |
| 关键词： | Concrete modeling, User Element subroutine (UEL), Linear Elastic Fracture Mechanics (LEFM), eXtended Finite Element Method (XFEM), Aging Degradation, Implementation, Multi-Stage Fatigue (MSF), Nuclear power plants (NPP), Concrete structures, Fatigue life analysis |
| 摘要： | In this work a numerical finite element framework is implemented to enable the integration of coupled multi-scale and multi-physics transport processes. A User Element subroutine (UEL) in Abaqus is used to simultaneously solve stress equilibrium, heat conduction, and multiple diffusion equations for 2D and 3D linear and quadratic elements. Transport processes in concrete structures and their degradation mechanisms are presented along with the discrimination of the governing equations. The multi-physics modeling framework is theoretically extended to the linear elastic fracture mechanics (LEFM) by introducing the eXtended Finite Element Method (XFEM) and based on the XFEM user element implementation of Giner et al. [2009]. A damage model that takes into account the damage contribution from the different degradation mechanisms is theoretically developed. The total contribution of damage is forwarded to a Multi-Stage Fatigue (MSF) model to enable the assessment of the fatigue life and the deterioration of reinforced concrete structures in a nuclear power plant. Finally, two examples are presented to illustrate the developed multi-physics user element implementation and the XFEM implementation of Giner et al. [2009]. |
| 报告类型： | 科技报告 |
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