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I am currently research scientist at Department of Materials and Structure. At the moment, I am mainly focused on the development of Robust domain decomposition methods for complex solid mechanics computations. I worked previously on multibody dynamics and predictive model for rolling bearing failure. The model uses multibody dynamic formalism, finite element structural element and specific rolling contact model (EHD, Kalker non linear creep theory).
This paper presents a new parallel mesh generation method leading to subdomains of shape well-suited to Schur based domain decomposition methods such as the FETI and BDD solvers. Starting from a coarse mesh, subdomains meshes are created in parallel through hierarchical mesh refinement and morphing techniques. The proposed methodology aims at limit...
This article introduces two strategies to reduce the memory cost of the Adaptive Multipreconditioned FETI method (AMPFETI) while preserving its capability to solve ill conditioned systems efficiently. Their common principle is to gather search directions into aggregates which are frequently adapted in order to achieve the best compromise between th...
Abstract The purpose of this article is to assess the adaptive multipreconditioned FETI solvers (AMPFETI) on real industrial problems and hardware. The multipreconditioned FETI algorithm (first introduced as Simultaneous FETI (Gosselet et al., 2015) is a non-overlapping domain decomposition method which exhibits good robustness properties without r...
Preconditioned Krylov subspace methods are powerful tools for solving linear systems but sometimes they converge very slowly, and often after a long stagnation. A natural way to fix this is by enlarging the space in which the solution is computed at each iteration. Following this idea, we propose in this note two multipreconditioned algorithms: mul...
This paper presents a modelling approach for predicting the internal dynamic behaviour of ball bearings under high moment loads. This type of loading is a specific feature of helicopter main gear boxes because of special design rules and the high structural flexibility of such systems. The ball bearing model proposed here is not limited to planar s...
Cetté etude présente un mod ele dynamique de roulement a billes utilisant le formalisme de la dyna-mique multicorps. Ce dernier permet l' intégration immédiate du mod ele dans les simulations de boˆtes de transmission de puissance d' hélicopt eres. Le roulement est considéré non lubrifié afin de prédire son comportement en cas de défaillance du sys...
This work presents the dynamic modeling of ball bearing which uses multibody dynamic formalism. Such formalism allows immediate integration of the model in dynamic simulations of helicopter main gear boxes. Ball bearing is considered non-lubricated in order to predict its behavior in case of lubrication system failure. Rolling contacts are treated...
In this project we develop a software solution to perform crack propagation simulations within various finite element solvers. Performing both crack insertion an propagation on a given fatigue non-linear input file from Abaqus, ANSYS, Code_Aster or Z-set/Zebulon, complex crack path, multiple crack front coalescing, contact between lips, etc. can be studied. Supported by Onera, and Ecole des Mines for ten years, some movies can be seen at : https://www.youtube.com/watch?v=vy2VRuaQL7A&list=PLBaVR7kXKP1J2gjQK1UooOwsmfua43aSO