A novel design method based on multi–objective optimization for graded lattice structure by additive manufacturing
ISSN: 1355-2546
Article publication date: 21 May 2024
Issue publication date: 1 July 2024
Abstract
Purpose
While performance demands in the natural world are varied, graded lattice structures reveal distinctive mechanical properties with tremendous engineering application potential. For biomechanical functions where mechanical qualities are required from supporting under external loading and permeability is crucial which affects bone tissue engineering, the geometric design in lattice structure for bone scaffolds in loading-bearing applications is necessary. However, when tweaking structural traits, these two factors frequently clash. For graded lattice structures, this study aims to develop a design-optimization strategy to attain improved attributes across different domains.
Design/methodology/approach
To handle diverse stress states, parametric modeling is used to produce strut-based lattice structures with spatially varied densities. The tailored initial gradients in lattice structure are subject to automatic property evaluation procedure that hinges on finite element method and computational fluid dynamics simulations. The geometric parameters of lattice structures with numerous objectives are then optimized using an iterative optimization process based on a non-dominated genetic algorithm.
Findings
The initial stress-based design of graded lattice structure with spatially variable densities is generated based on the stress conditions. The results from subsequent dual-objective optimization show a series of topologies with gradually improved trade-offs between mechanical properties and permeability.
Originality/value
In this study, a novel structural design-optimization methodology is proposed for mathematically optimizing strut-based graded lattice structures to achieve enhanced performance in multiple domains.
Keywords
Acknowledgements
This work was supported by Sichuan Science and Technology Programs (2022YFS0021 and 2022YFG0214) and the 1·3·5 project for disciplines of excellence, West China Hospital, Sichuan University (ZYJC21081).
Citation
Li, X., Zhu, L., Fan, S., Wei, Y., Wu, D. and Gong, S. (2024), "A novel design method based on
Publisher
:Emerald Publishing Limited
Copyright © 2024, Emerald Publishing Limited