American Institute of Mathematical Sciences

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June  2006, 1(2): 259-274. doi: 10.3934/nhm.2006.1.259

On the scaling from statistical to representative volume element in thermoelasticity of random materials

Xiangdong Du 1, and  Martin Ostoja-Starzewski 2,

1. 

Department of Mechanical Engineering, McGill University, Montreal, QC H3A 2K6, Canada
2. 

Department of Mechanical and Industrial Engineering, 1206 W. Green Street, University of Illinois at Urbana-Champaign, Urbana, IL 61801-2906, United States

Received  November 2005 Revised  February 2006 Published  March 2006

Under consideration is the finnite-size scaling of effective thermoelastic properties of random microstructures from a Statistical Volume Element (SVE) to a Representative Volume Element (RVE), without invoking any periodic structure assumptions, but only assuming the microstructure's statistics to be spatially homogeneous and ergodic. The SVE is set up on a mesoscale, i.e. any scale finite relative to the microstructural length scale. The Hill condition generalized to thermoelasticity dictates uniform Neumann and Dirichlet boundary conditions, which, with the help of two variational principles, lead to scale dependent hierarchies of mesoscale bounds on effective (RVE level) properties: thermal expansion and stress coefficients, effective stiffness, and specific heats. Due to the presence of a non-quadratic term in the energy formulas, the mesoscale bounds for the thermal expansion are more complicated than those for the stiffness tensor and the heat capacity. To quantitatively assess the scaling trend towards the RVE, the hierarchies are computed for a planar matrix-inclusion composite, with inclusions (of circular disk shape) located at points of a planar, hard-core Poisson point field. Overall, while the RVE is attained exactly on scales infinitely large relative to the microscale, depending on the microstructural parameters, the random fluctuations in the SVE response may become very weak on scales an order of magnitude larger than the microscale, thus already approximating the RVE.
Keywords: scale effects, representative volume element., thermoelasticity, homogenization, random media.
Mathematics Subject Classification: 35R60, 74F05, 74Q05, 74Q20, 74A6.
Citation: Xiangdong Du, Martin Ostoja-Starzewski. On the scaling from statistical to representative volume element in thermoelasticity of random materials. Networks & Heterogeneous Media, 2006, 1 (2) : 259-274. doi: 10.3934/nhm.2006.1.259
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