Mesh-free micromechanical modeling of inverse opal structures

Journal
International journal of mechanical sciences  
Volume
204
Article Number
106577
Citation
International Journal of Mechanical Sciences 204: 106577 (2021-08)
Publisher DOI
10.1016/j.ijmecsci.2021.106577
Scopus ID
2-s2.0-85108295641
Publisher
Elsevier Science
The application of mesh-free discrete element method (DEM) for modeling of macroporous inverse opals is proposed. The developed and implemented DEM-based strategy is applied to analyze stiffness and strength of inverse opals made of pure silica and inverse opals coated with titania layers of various thicknesses. Also, the influence of the porosity of the initial packing on the properties of the material is investigated. Simulation results have shown that due to the heterogeneous macroscopic structure and unequal material distribution in nodes, struts or near interstitial pores, strong inhomogeneities of the stress distribution arise. Spots of localized stresses located near the interpore openings are the sources of initial defects and small interpore cracks. Reducing the overall porosity or an additional coating of the structure with a titania layer allows to partially homogenize and improve its mechanical properties. It was shown that the obtained simulation results are in very good agreement with previous studies. Despite large computational effort, the performed analysis confirms the high efficiency of the proposed DEM-based approach and demonstrates its great potential for use in problems of a similar class: for modelling of complex-structured multicomponent materials.
Subjects
Bonded particle method
Discrete element method
Fracture behavior
Inverse opal
Metamaterials
DDC Class
600: Technik
Funding(s)
SFB 986: Teilprojekt A03 - Herstellung höherer hierarchischer Ebenen von Materialsystemen mit der Wirbelschicht-granulation und Diskrete-Elemente-Modellierung der Materialien  
Funding Organisations
Deutsche Forschungsgemeinschaft (DFG)  
More Funding Information
Funded by the Deutsche Forschungsgemeinschaft (DFG, German Re- search Foundation) –Projektnummer 192346071 –SFB 986 .
Publication version
publishedVersion
Lizenz
https://creativecommons.org/licenses/by/4.0/
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