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Structural and Multidisciplinary Optimization

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23-09-2016 | RESEARCH PAPER

Synthesis of auxetic structures using optimization of compliant mechanisms and a micropolar material model

Authors: Matteo Bruggi, Valentina Zega, Alberto Corigliano

Published in: Structural and Multidisciplinary Optimization | Issue 1/2017

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Abstract

Aim of this work is the synthesis of auxetic structures using a topology optimization approach for micropolar (or Cosserat) materials. A distributed compliant mechanism design problem is formulated, adopting a SIMP–like model to approximate the constitutive parameters of 2D micropolar bodies. The robustness of the proposed approach is assessed through numerical examples concerning the optimal design of structures that can expand perpendicularly to an applied tensile stress. The influence of the material characteristic length on the optimal layouts is investigated. Depending on the inherent flexural stiffness of micropolar solids, truss–like solutions typical of Cauchy solids are replaced by curved beam–like material distributions. No homogenization technique is implemented, since the proposed design approach applies to elements made of microstructured material with prescribed properties and not to the material itself.

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Title: Synthesis of auxetic structures using optimization of compliant mechanisms and a micropolar material model
Authors: Matteo Bruggi
Valentina Zega
Alberto Corigliano
Publication date: 23-09-2016
Publisher: Springer Berlin Heidelberg
Published in: Structural and Multidisciplinary Optimization / Issue 1/2017
Print ISSN: 1615-147X
Electronic ISSN: 1615-1488
DOI: https://doi.org/10.1007/s00158-016-1589-9

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