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Multi-level adaptive refinement method for cracking of heterogeneous materials

​Éric Delaume has defended his thesis on 27th November 2017 at University of Montpellier (France).

Document type > *Mémoire/HDR/Thesis

Keywords >

Research Unit > IRSN/PSN-RES/SEMIA/LPTM

Authors > DELAUME Éric

Publication Date > 27/11/2017

Summary

​​In order to anticipate effects of ageing in confinement structures of nuclear power plant, the IRSN develops research programs to study the ageing of concrete. A micromechanical approach, based on Cohesive Zone Models, and the Eigen-Erosion method, based on energetics consideration, are used. The aim of this study is to reduce the computational cost while keeping simulations with good accuracy in the areas of interest. The strategy is to adapt the spatial discretization in the areas of interest using local adaptive refinement technics.  The selected refinement method is called CHARMS (Conforming Hierarchical Adaptive Renement Methods). CHARMS is based on the refinement of basis functions and enables refinement without any loss of the inital mesh quality. The geometrical non-conformities are implicitly handled. Initialy applied to Fluid Mechanics, the method is first extended to Solid Mechanics with a specific refinement criterion. It is then applied to Eigen-Erosion and to Cohesive Zone Models. The inclusion's shape of a Representative Elementary Volume of numerical concrete is studied in order to determine the influence over the apparent behaviour and the crack propagation.

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