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Communication Dans Un Congrès Année : 2008

MULTI-SCALE DYNAMIC METHOD FOR STRUCTURES WITH CONTACT INTERFACES

Résumé

The increasing complexity of calculations has created a need for techniques capable of drastically reducing computation times in finite element analysis. Today's expectations in terms of calculation accuracy lead to larger and larger numerical models, which sometimes leads to prohibitive calculation times, in particular for modelling large assemblies with connections in dynamics [1]. However, these connections play a major role in the dimensioning process, because they are the place of strongly nonlinear local phenomena: contact and friction. Moreover, for structural engineers, the incorporation of a system's parametric uncertainties into such an analysis constitutes a challenge; however, without this information, the structural response cannot be calculated accurately. These parametric uncertainties may affect the material's mechanical properties (modulus, strength, etc.), the structure's geometric properties (cross-sectional properties and dimensions), the boundary conditions (including contact with friction), the magnitude and distribution of loads, etc. In the case of structural assemblies, the knowledge of the friction coefficients is especially limited. In order to take these uncertainties into account, it is necessary to calculate the response of the structure for each set of values of the design parameters [2]. Typically, in our case, the design parameters are friction coefficients and gaps. In addition, one is often confronted with a problem of memory size. It is in this context that domain decomposition methods and multi-scale calculation techniques originated a few years ago. Besides the fact that they allow greater flexibility in the numerical models and savings in computation time, these methods are particularly well suited to parallel computing with shared memory. Nevertheless, they can be easily adapted to distributed memory architectures. This paper is based on a mixed domain decomposition multi-scale approach in explicit dynamics. The aim of the present work is to develop an efficient strategy for the parametric analysis of dynamics problems with multiple contacts. The applications concern elastic, structural assemblies in dynamics with local nonlinearities such as unilateral contact with friction. Our approach is based on a decomposition of the assembly into sub-structures (representing the parts) and interfaces (representing the connections).
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Dates et versions

hal-01625052 , version 1 (27-10-2017)

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  • HAL Id : hal-01625052 , version 1

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Pierre-Alain Boucard, David Odièvre, Fabrice Gatuingt. MULTI-SCALE DYNAMIC METHOD FOR STRUCTURES WITH CONTACT INTERFACES. World Congress on Computational Mechanics (WCCM8), Jul 2008, Venice, Italy. ⟨hal-01625052⟩
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