Modelling the microstructure and computing effective elastic properties of sand core materials
Modelling the microstructure and computing effective elastic properties of sand core materials
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DOI：
10.1016/j.ijsolstr.2018.02.008
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发表时间：
2018-06-15
影响因子：
3.6
通讯作者：
Steeb, Holger
中科院分区：
文献类型：
--
作者：
Schneider, Matti;Hofmann, Tobias;Steeb, Holger
在这篇文章中，我们在微米尺度上模拟砂芯材料，解决单个砂粒和结合桥，通过计算均匀化获得复合材料的有效弹性模量，为研究铸造用砂芯吹制零件的强度特性奠定了基础。我们基于X射线显微计算机断层扫描（mu XRCT）分析了砂芯材料图像并从该体积图像中提取几个沙粒。这些颗粒进入填充算法，该算法可以生成具有高填充分数的颗粒包，并包含具有高复杂性的砂粒。提供与粘结剂的微观结构进行了研究，推导出其有效的弹性性能和研究的灵敏度w.r.t.进入参数。如果一个现实的范围内的弹性参数的砂克和粘合剂被插入到模拟中，与实验获得的P波模量的协议是极好的。(C)2018爱思唯尔有限公司版权所有
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.