Journal
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
Volume 143, Issue -, Pages 1-17Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2018.02.008
Keywords
Composite materials; Elastic moduli; Homogenization; Micro-mechanics; Porous media
Categories
Funding
- DFG [AN 341/9-1, VO 1487/16-1]
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In this article we model sand core materials on the micro-meter scale, resolving individual sand grains and binding bridges, to obtain effective elastic moduli of the composite by computational homogenization, laying the foundations for investigating the strength properties of core blown parts with foundry applications. We analyze sand core materials on the basis of X-ray micro-computed tomography (mu XRCT) images and extract a couple of sand grains from this volume image. These grains enter a packing algorithm which can generate granular packs with high packing fraction and incorporate sand grams with high complexity. Furnished with binder the resulting microstructures are investigated, deriving their effective elastic properties and studying the sensitivity w.r.t.the entering parameters. If a realistic range of elastic parameters of both sand grams and binder are plugged into the simulation, the agreement with experimentally obtained P-wave moduli is excellent. (C) 2018 Elsevier Ltd. All rights reserved.
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