Modelling the microstructure and computing effective elastic properties of sand core materials

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:143

Article

Schneider, Matti¹  Hofmann, Tobias²  Andrae, Heiko²  Lechner, Philipp³  Ettemeyer, Florian⁴  Volk, Wolfram^3,4  Steeb, Holger⁵ 

[1] Karlsruhe Inst Technol, Inst Engn Mech, Kaiserstrae 10, D-30676131 Karlsruhe, Germany

[2] Fraunhofer Inst Ind Math ITWM, Dept Flow & Mat Simulat, Kaiserslautern, Germany

[3] Tech Univ Munich, Inst Met Forming & Casting, Munich, Germany

[4] Fraunhofer Res Inst Casting Composite & Proc Tech, Dept Casting Technol, Garching, Germany

[5] Univ Stuttgart, Inst Appl Mech, Stuttgart, Germany

关键词: Composite materials;    Elastic moduli;    Homogenization;    Micro-mechanics;    Porous media;   

DOI  :  10.1016/j.ijsolstr.2018.02.008

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free