On the treatments of heterogeneities and periodic boundary conditions for isogeometric homogenization analysis

Seishiro Matsubara, Shin Nosuke Nishi, Kenjiro Terada

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The treatments of heterogeneities and periodic boundary conditions are explored to properly perform isogeometric analysis (IGA) based on NURBS basis functions in solving homogenization problems for heterogeneous media with omni-directional periodicity and composite plates with in-plane periodicity. Because the treatment of the combination of different materials in IGA models is not trivial especially for periodicity constraints, the first priority is to clearly specify points at issue in the numerical modeling, or equivalently mesh generation, for IG homogenization analysis (IGHA). The most awkward, but important issue is how to generate patches for NURBS representation of the geometry of a rectangular parallelepiped unit cell to realize appropriate deformations in consideration of the convex-hull property of IGA. The issue arises from the introduction of overlapped control points located at angular points in the heterogeneous unit cell, which must satisfy multiple point constraint (MPC) conditions associated with periodic boundary conditions (PBCs). Although two measures may be conceivable, we suggest the use of multiple patches along with double MPC that imposes PBCs and the continuity conditions between different patches simultaneously. Several numerical examples of numerical material and plate tests are presented to demonstrate the validity of the proposed strategy of IG modeling for IGHA.

Original languageEnglish
Pages (from-to)1523-1548
Number of pages26
JournalInternational Journal for Numerical Methods in Engineering
Volume109
Issue number11
DOIs
Publication statusPublished - 2017 Mar 16

Keywords

  • homogenization
  • isogeometric analysis
  • numerical material testing
  • numerical plate testing

ASJC Scopus subject areas

  • Numerical Analysis
  • Engineering(all)
  • Applied Mathematics

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