Strength of hierarchically porous ceramics: Discrete simulations on X-ray nanotomography images

SCRIPTA MATERIALIA

卷:113

Article

Roussel, Denis¹  Lichtner, Aaron²  Jauffres, David¹  Villanova, Julie³  Bordia, Rajendra K.⁴  Martin, Christophe L.¹ 

[1] Univ Grenoble Alpes, CNRS, SIMAP, F-38000 Grenoble, France

[2] Univ Washington, Dept Mat Sci & Engn, Seattle, WA 98195 USA

[3] European Synchrotron Radiat Facil, F-38043 Grenoble 9, France

[4] Clemson Univ, Dept Mat Sci & Engn, Clemson, SC 29634 USA

关键词: Porous material;    Fracture;    Three-dimensional tomography;    Discrete simulations;   

DOI  :  10.1016/j.scriptamat.2015.11.015

来源: Elsevier

【 摘 要 】

Porous ceramic samples were processed either by freeze-casting or by slip-casting with pore formers. They were partially sintered to obtain a total porosity in between 44 and 69%. Samples were imaged by X-ray nanotomography with 75 nm resolution. The images, approximately 70(3) to 90(3) mu m(3) in size, were merged with randomly packed particles to obtain representative numerical microstructures. The numerical samples were crushed uniaxially using discrete element simulations with appropriate microscopic fracture properties. This revealed anisotropic behavior for freeze-cast samples. Simulated strength values were compared to experimental data, with some consideration given to sample volume. (C) 2015 Elsevier Ltd. All rights reserved.

【 授权许可】

Free