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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)]

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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.

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Acknowledgments

This work is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation)–Projektnummer 192346071–SFB 986 Tailor-Made Multi-Scale Materials Systems: M3 project B4. J. Weissmüller is acknowledged for making the Mathematica script available published in [3] that allowed for reproducing the 3D microstructures. E.T. Lilleodden is acknowledged for discussions and editing of the manuscript.

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Authors and Affiliations

  1. Institute of Materials Research, Materials Mechanics, Helmholtz-Zentrum Geesthacht, Max-Planck-Str. 1, 21502, Geesthacht, Germany

    Norbert Huber & Claudia Richert

  2. Institute of Materials Physics and Technology, Hamburg University of Technology, Eissendorfer Str. 42, 21073, Hamburg, Germany

    Norbert Huber

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  1. Norbert Huber
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  2. Claudia Richert
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Correspondence to Norbert Huber.

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Huber, N., Richert, C. 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)]. Journal of Materials Research 35, 2831–2834 (2020). https://doi.org/10.1557/jmr.2020.257

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  • DOI: https://doi.org/10.1557/jmr.2020.257

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