Multiscale structural topology optimization with an approximate constitutive model for local material microstructure - Université de technologie de Compiègne Access content directly
Journal Articles Computer Methods in Applied Mechanics and Engineering Year : 2015

Multiscale structural topology optimization with an approximate constitutive model for local material microstructure

Piotr Breitkopf

Abstract

This paper builds on our recent work (Xia and Breitkopf, 2014) on multiscale structural topology optimization where at the microscopic scale, local materials are optimized concurrently according to current loading status. The former design framework requires intensive computational cost due to large number of repetitive local material optimizations. To circumvent this limitation, in the present work, we construct a reduced database model viewing the local material optimization process as a generalized constitutive behavior using separated representations. In this model, the database is built from a set of numerical experiments of local material optimizations in the macroscopic strain tensor space. Each value in the database corresponds to the strain energy density evaluated on a material microstructure, optimized according to the imposed macroscopic strain. By tensor decomposition, a continuous representation of the strain energy density is built as a sum of products of one dimensional interpolation functions. As a result of this a priori off-line step, the effective strain–energy and stress–strain relations required for macroscopic structural evaluation and optimization are provided in a numerically explicit manner. The results given by the reduced database model are compared with full-scale results. It is also shown that this explicit constitutive behavior representation can well serve multiscale structural design at a significantly reduced computational cost.
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Dates and versions

hal-01993115 , version 1 (24-01-2019)

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Liang Xia, Piotr Breitkopf. Multiscale structural topology optimization with an approximate constitutive model for local material microstructure. Computer Methods in Applied Mechanics and Engineering, 2015, 286, pp.147-167. ⟨10.1016/j.cma.2014.12.018⟩. ⟨hal-01993115⟩
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