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Comment to “Skeletonization-based beam finite element models for stochastic bicontinuous materials: Application to simulations of nanoporous gold” by C. Soyarslan et al. [J. Mater. Res. 33(20), 3371 (2018)]

Published online by Cambridge University Press:  07 October 2020

Norbert Huber Open the ORCID record for Norbert Huber [Opens in a new window]  and
Claudia Richert
Norbert Huber*
Affiliation:
Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1, 21502Geesthacht, Germany Institute of Materials Physics and Technology, Hamburg University of Technology, Eissendorfer Str. 42, 21073Hamburg, Germany
Claudia Richert
Affiliation:
Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1, 21502Geesthacht, Germany
*
a)Address all correspondence to this author. e-mail: norbert.huber@hzg.de
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Abstract

Soyarslan et al. [J. Mater. Res. 33(20), 3371 (2018)] proposed a beam-finite element model for the computation of effective elastic properties of nanoporous materials, where the ligament diameter along the skeleton is determined with the biggest sphere algorithm. Although this algorithm is often used in the literature, it is known that it systematically overestimates the diameter in network structures. Thus, the need for further stiffening of the junction zones as proposed by the authors is in contradiction to the literature. Furthermore, the factor 40 appears to be one order of magnitude too high. We show that the 3D microstructures generated from random Gaussian fields contain features that are violating the assumption of circular cross-sections and, therefore, cannot be captured by the biggest sphere algorithm. Consequently, the authors required an unphysically high value of 40 to compensate this hidden effect.

Keywords

microstructuremodelingelastic properties
Type
Commentary
Information
Journal of Materials Research , Volume 35 , Issue 20 , 28 October 2020 , pp. 2831 - 2834
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Copyright
Copyright © The Author(s), 2020, published on behalf of Materials Research Society by Cambridge University Press

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References

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