Nonlinear structural design using multiscale topology optimization. Part I: Static formulation

P. B. Nakshatrala, D. A. Tortorelli, K. B. Nakshatrala

Research output: Contribution to journalArticle

Abstract

We present a hierarchical multiscale design framework that couples computational homogenization with topology optimization to design a composite structure's microstructure to optimize its nonlinear elastostatic behavior. To generate a well-posed macroscopic topology optimization problem, we use relaxation which requires homogenization to relate the macroscopic homogenized response to its microstructure. And because closed form expressions for homogenized properties generally do not exist for materials with nonlinear response we rely on computational homogenization to evaluate them. To optimize the homogenized properties of the unit cell we again use topology optimization and to make this unit cell optimization problem well posed we use restriction and thereby obtain a minimum microstructural length scale. The coupled nonlinear analyzes and optimization problems are computationally intensive tasks that we resolve with a scalable parallel framework based on a single-program-multiple-data programming paradigm. Numerical implementation is discussed and examples are provided.

Original languageEnglish (US)
Pages (from-to)167-176
Number of pages10
JournalComputer Methods in Applied Mechanics and Engineering
Volume261-262
DOIs
StatePublished - Jul 15 2013

Keywords

  • Computational homogenization
  • Macroscopic overall response
  • Nonlinear materials
  • Topology optimization

ASJC Scopus subject areas

  • Computational Mechanics
  • Mechanics of Materials
  • Mechanical Engineering
  • Physics and Astronomy(all)
  • Computer Science Applications

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