On Boundary Conditions in Multiscale Second-Order Computational Homogenization Scheme

Lesičar, Tomislav and Tonković, Zdenko and Sorić, Jurica (2013) On Boundary Conditions in Multiscale Second-Order Computational Homogenization Scheme. = On Boundary Conditions in Multiscale Second-Order Computational Homogenization Scheme. In: South-East European Conference on Computational Mechanics (3 ; 2013), 12.-14.06.2013, Kos, Grčka.

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The present study deals with a second-order two-scale computational homogenization procedure for modeling deformation responses of heterogeneous materials at small strains. The macro to micro transition and the application of generalized periodic boundary conditions on the representative volume element (RVE) at the microlevel are investigated. The structure at macroscale level is discretized by the C1 two dimensional triangular finite elements, while the C0 quadrilateral finite element is used for the discretization of the RVE. The finite element formulations and the new proposed multiscale scheme have been implemented into the finite element software ABAQUS using user subroutines derived. Due to the C1-C0 continuity transition, an additional integral condition on microlevel fluctuation field has to be imposed, as expected.. The integration has been performed using various numerical integration techniques and the results obtained are compared in a few examples. It is concluded that only trapezoidal rule gives a physically based deformed shape of the RVE. Finally, the efficiency and accuracy of the proposed multiscale homogenization approach are demonstrated by the modeling of a shear layer problem, usually used as a benchmark in multiscale analyses.

Item Type: Conference or Workshop Item (Lecture)
Keywords (Croatian): multiscale, computational homogenization, RVE
Subjects: TECHNICAL SCIENCE > Mechanical Engineering
Divisions: 200 Department of Engineering Mechanics > 210 Chair of Mechanics and Strength of Materials
Indexed in Web of Science: No
Indexed in Current Contents: No
Date Deposited: 31 Mar 2016 10:02
Last Modified: 06 Apr 2016 06:49
URI: http://repozitorij.fsb.hr/id/eprint/5323

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