Computer modeling of systematic processing defects on the thermal and elastic properties of open Kelvin-cell metamaterials

• Published in: Journal of the European Ceramic Society 2021-11, Vol.41 (14), p.7130-7140
• Main Authors: Hříbalová, Soňa, Uhlířová, Tereza, Pabst, Willi
• Format: Article
• Language: English
• Subjects: Additive manufacturing; Elastic constants (Young’s modulus, Poisson ratio); Metamaterials; Open-cell foams; Thermal conductivity
• ISSN: 0955-2219; 1873-619X
• DOI: 10.1016/j.jeurceramsoc.2021.07.031

•Effect of microstructural defects on effective thermal conductivity was investigated via computer modeling.•Effect of microstructural defects on effective elastic constants was investigated via computer modeling.•The Pabst-Gregorová cross-property relation provides excellent prediction of conductivity-modulus correlation. Open-cell metamaterials prepared by additive manufacturing or replica techniques are typically prone to processing defects resulting from limited resolution, strut cross-section variations or internal strut porosity. These defects are expected to cause deviations from the ideal (CAD-based or template-based) target microstructures and thus from the envisaged properties. This paper investigates some of these effects in a quantitative manner. Based on computer-generated open Kelvin-cell (tetrakaidecahedral) alumina-based metamaterials, the effective thermal conductivity and elastic constants, mainly Young’s modulus, are calculated in dependence of the voxel size, strut thinning and strut wall thickness. It is shown that the porosity dependence of smooth, straight and full struts agrees closely to the Gibson-Ashby prediction for open-cell foams, while limited resolution and strut thinning leads to property values that tend to be lower and hollow struts lead to higher property values. The Pabst-Gregorová cross-property relation gives an excellent prediction of the conductivity-modulus correlation in all cases.