Anisotropic strain gradient thermoelasticity for cellular structures: Plate models, homogenization and isogeometric analysis

Sergei Khakalo (Corresponding Author), Jarkko Niiranen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

For three-dimensional cellular plate-like structures with a triangular (extruded lattice) microarchitecture, the article develops a pair of two-scale plate models relying on the anisotropic form of Mindlin’s strain gradient thermoelasticity theory. Accordingly, a computational homogenization method is proposed for determining the constitutive parameters of the related higher-order constitutive tensors. First, a Reissner–Mindlin plate model is derived by dimension reduction from a general framework of three-dimensional orthotropic strain gradient thermoelasticity and written as a variational formulation. An isogeometric conforming Galerkin method is formulated accordingly. Second, the plate model is modified in order to reduce the number of the constitutive strain gradient parameters. These steps are then repeated by following the kinematical assumptions of the Kirchhoff plate theory. Third, in order to see the cellular microarchitecture as a homogeneous three-dimensional material with classical modulae of transversal isotropy, classical computational homogenization is accomplished for determining the corresponding material parameters. Fourth, in order to see the cellular structures as two-dimensional plates, a non-classical homogenization procedure is proposed for the identification of the strain gradient modulae of the plate models. Finally, a set of numerical examples illustrates the reliability and efficiency of the resulting plate models in homogenizing cellular plate-like structures into strain gradient plate models capturing the bending size effects induced by the microarchitecture.
Original languageEnglish
Article number103728
Number of pages36
JournalJournal of the Mechanics and Physics of Solids
Volume134
Early online date2019
DOIs
Publication statusE-pub ahead of print - 2019
MoE publication typeA1 Journal article-refereed

Fingerprint

thermoelasticity
Thermoelasticity
homogenizing
gradients
Homogenization method
Galerkin methods
Tensors
plate theory
Galerkin method
isotropy
tensors
formulations

Keywords

  • Cellular plates
  • Lattice microarchitecture
  • Strain gradient thermoelasticity
  • Reissner–Mindlin plate
  • Kirchhoff plate
  • Size effectsIsogeometric analysis

Cite this

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title = "Anisotropic strain gradient thermoelasticity for cellular structures: Plate models, homogenization and isogeometric analysis",
abstract = "For three-dimensional cellular plate-like structures with a triangular (extruded lattice) microarchitecture, the article develops a pair of two-scale plate models relying on the anisotropic form of Mindlin’s strain gradient thermoelasticity theory. Accordingly, a computational homogenization method is proposed for determining the constitutive parameters of the related higher-order constitutive tensors. First, a Reissner–Mindlin plate model is derived by dimension reduction from a general framework of three-dimensional orthotropic strain gradient thermoelasticity and written as a variational formulation. An isogeometric conforming Galerkin method is formulated accordingly. Second, the plate model is modified in order to reduce the number of the constitutive strain gradient parameters. These steps are then repeated by following the kinematical assumptions of the Kirchhoff plate theory. Third, in order to see the cellular microarchitecture as a homogeneous three-dimensional material with classical modulae of transversal isotropy, classical computational homogenization is accomplished for determining the corresponding material parameters. Fourth, in order to see the cellular structures as two-dimensional plates, a non-classical homogenization procedure is proposed for the identification of the strain gradient modulae of the plate models. Finally, a set of numerical examples illustrates the reliability and efficiency of the resulting plate models in homogenizing cellular plate-like structures into strain gradient plate models capturing the bending size effects induced by the microarchitecture.",
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Anisotropic strain gradient thermoelasticity for cellular structures: Plate models, homogenization and isogeometric analysis. / Khakalo, Sergei (Corresponding Author); Niiranen, Jarkko.

In: Journal of the Mechanics and Physics of Solids, Vol. 134, 103728, 01.01.2020.

Research output: Contribution to journalArticleScientificpeer-review

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