Discrete element modeling of microstructure of nacre
The microstructure of nacre consists of polygon-shaped aragonite mineral tablets bonded by very thin layers of organic materials and is organized in a brick–mortar morphology. In this research, the discrete element method was utilized to model this structure. The aragonite mineral tablets were modeled with three-dimensional polygon particles generated by the Voronoi tessellation method to represent the Voronoi-like patterns of mineral tablets assembly observed in experiments. The organic matrix was modeled with a group of spring elements. The constitutive relations of the spring elements were inspired from the experimental results of organic molecules from the literature. The mineral bridges were modeled with simple elastic bonds with the parameters based on experimental data from the literature. The bulk stress–strain responses from the models agreed well with experimental results. The model results show that the mineral bridges play important roles in providing the stiffness and yield strength for the nacre, while the organic matrix in providing the ductility for the nacre. This work demonstrated the suitability of particle methods for modeling microstructures of nacre.
KeywordsDiscrete element method Nacre Microstructure Material modeling
The authors acknowledge the financial support for this work provided by the US Army Engineer Research and Development Center (ERDC) Military Engineering 6.1 Basic Research Program. Permission to publish was granted by the Director, ERDC Geotechnical and Structures Laboratory.
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Conflict of interest
On behalf of all authors, the corresponding author states that there is no conflict of interest.
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