A novel multiscale design method for porous structures with tunable anisotropy: Varied-shape Voronoi tessellation

Li, Zeyang and Wu, Zhangming ORCID: https://orcid.org/0000-0001-7100-3282 2024. A novel multiscale design method for porous structures with tunable anisotropy: Varied-shape Voronoi tessellation. Computer Methods in Applied Mechanics and Engineering 432 (Part A) , 117378. 10.1016/j.cma.2024.117378

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Abstract

Natural materials, through the multiscale architected organisms they contain, can evolve and control anisotropic properties to enhance their functionality and performance, thereby improving their adaptability to external environments. Similarly, recent studies have demonstrated engineered porous materials with multiscale architected structures and tunable anisotropy can achieve superior performance compared to commonly used isotropic porous materials. In this work, by locally tessellating varied-shaped Voronoi structures with modified Riemannian metric, we develop a novel bio-inspired design framework for multiscale porous structures, which can possess tunable orientation, porosity and anisotropic property. The effective mechanical properties of multiscale varied-shaped Voronoi tessellated (VSVT) porous structures are evaluated using a numerical homogenization technique, and finally expressed as a function of design parameters, i.e., anisotropy ratio, relative density, and material direction. A gradient-based, multi-scale, multi-component optimization workflow is applied to design and optimize porous materials and structures that mimic natural patterns. Typical design cases, such as Messerschmitt–Bölkow–Blohm beams with global or local volume constraints, have been carried out to verify the proposed VSVT method. The obtained geometry models from the de-homogenization procedure not only demonstrate high computational accuracy and improved compliance performance, but also exhibit flexible biofunctional compatibility like tailored specific surface area. This implies that the proposed VSVT design method for multiscale porous materials and structures have strong potentials for engineering applications, such as, implants, architecture, energy storage, and etc.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	Elsevier
ISSN:	0045-7825
Date of First Compliant Deposit:	27 September 2024
Date of Acceptance:	7 September 2024
Last Modified:	08 Oct 2024 10:45
URI:	https://orca.cardiff.ac.uk/id/eprint/172436

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