Abstract

Scale dependence of electrostatic and magnetostatic properties is investigated in the setting of spatially random linear lossless materials with statistically homogeneous and spatially ergodic random microstructures. First, from the Hill-Mandel homogenization conditions adapted to electric and magnetic fields, uniform boundary conditions are formulated for a statistical volume element (SVE). From these conditions, there follow upper and lower mesoscale bounds on the macroscale (effective) electrical permittivity and magnetic permeability. Using computational electromagnetics methods, these bounds are obtained through numerical simulations for composites of two types: (i) two-dimensional (2D) random checkerboard (two-phase) microstructures and (ii) analogous 3D random (two-phase) media. The simulation results demonstrate a scale-dependent trend of these bounds toward the properties of a representative volume element (RVE). This transition from SVE to RVE is described using a scaling function dependent on the mesoscale δ, the volume fraction vf, and the property contrast k between two phases. The scaling function is calibrated through fitting the data obtained from extensive simulations (∼10000) conducted over the aforementioned parameter space. The RVE size of a given microstructure can be estimated down to within any desired accuracy using this scaling function as parametrized by the contrast and the volume fraction of two phases.

Original languageEnglish (US)
Article number022120
JournalPhysical Review E
Volume99
Issue number2
DOIs
StatePublished - Feb 13 2019

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Magnetostatics
magnetostatics
Electrostatics
electrostatics
Scaling Function
Microstructure
scaling
Volume Fraction
microstructure
lossless materials
Computational Electromagnetics
computational electromagnetics
simulation
Dependent
Permittivity
homogenizing
Homogenization
Permeability
Parameter Space
Electric Field

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

Cite this

Electrostatic and magnetostatic properties of random materials. / Karimi, Pouyan; Zhang, Xian; Yan, Su; Starzewski, Martin Ostoja; Jin, Jianming.

In: Physical Review E, Vol. 99, No. 2, 022120, 13.02.2019.

Research output: Contribution to journalArticle

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