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A discrete sine–cosine based method for the elasticity of heterogeneous materials with arbitrary boundary conditions

Article dans une revue avec comité de lecture
Author
ccJOSEPH, Paux
ccMORIN, Léo
1002421 Institut de Mécanique et d'Ingénierie [I2M]
ccGELEBART, Lionel
AMADOU SANOKO, Abdoul Magid
1002421 Institut de Mécanique et d'Ingénierie [I2M]

URI
http://hdl.handle.net/10985/25775
DOI
10.1016/j.cma.2024.117488
Date
2024

Abstract

The aim of this article is to extend Moulinec and Suquet (1998)’s FFT-based method for heterogeneous elasticity to non-periodic Dirichlet/Neumann boundary conditions. The method is based on a decomposition of the displacement into a known term verifying the boundary conditions and a fluctuation term, with no contribution on the boundary, and described by appropriate sine–cosine series. A modified auxiliary problem involving a polarization tensor is solved within a Galerkin-based method, using an approximation space spanned by sine–cosine series. The elementary integrals emerging from the weak formulation of the equilibrium are approximated by discrete sine–cosine transforms, which makes the method relying on the numerical complexity of Fourier transforms. The method is finally assessed in several problems including kinematic uniform, static uniform and arbitrary Dirichlet/Neumann boundary conditions.

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