Computational nonlinear stochastic homogenization using a non-concurrent multiscale approach for hyperelastic heterogeneous microstructures analysis

A. Clément (1) , Christian Soize (1) , Julien Yvonnet (1)

1 MSME - Laboratoire de Modélisation et Simulation Multi Echelle

This paper is devoted to the computational nonlinear stochastic homogenization of a hyperelastic heterogeneous microstructure using a non-concurrent multiscale approach. The geometry of the microstructure is random. Since the non-concurrent multiscale approach is based on the use of a tensorial decomposition, which is then submitted to the curse of dimensionality, we perform an analysis with respect to the stochastic dimension. The technique uses a database describing the strain energy density function (potential) in both the macroscopic Cauchy Green strain space and the geometrical random parameters domain. Each value of the potential is numerically computed by means of the finit element method on an elementary cell. An interpolation scheme is finall introduced to obtain a continuous explicit form of the potential, which, by derivation, allows to evaluate the macroscopic stress and elastic tangent tensors during the macroscopic structural computations. Two numerical examples are presented

Mots clés: computational mechanics; stochastic homogenization; nonlinear heterogeneous materials; random microstructures

Domaines: Mécanique [physics.med-ph]; Matériaux; Probabilités [math.PR]

A. Clément, Christian Soize, Julien Yvonnet. Computational nonlinear stochastic homogenization using a non-concurrent multiscale approach for hyperelastic heterogeneous microstructures analysis. International Journal for Numerical Methods in Engineering, 2012, 91 (8), pp.799-824. ⟨10.1002/nme.4293⟩. ⟨hal-00743683⟩