Strategies for functionally graded lattice structures derived using topology optimisation for Additive Manufacturing

By A. Panesar, Meisam Abdi, D. Hickman, Ian Ashcroft. 2018

482 citations recorded by the source corpus.

A number of strategies that enable lattice structures to be derived from Topology Optimisation (TO) results suitable for Additive Manufacturing (AM) are presented. The proposed strategies are evaluated for mechanical performance and assessed for AM specific design related manufacturing considerations. From a manufacturing stand-point, support structure requirement decreases with increased extent of latticing, whereas the design-to-manufacture discrepancies and the processing efforts, both in terms of memory requirements and time, increase. Results from Finite Element (FE) analysis for the two loading scenarios considered: intended loading, and variability in loading, provide insight into the solution optimality and robustness of the design strategies. Lattice strategies that capitalised on TO results were found to be considerably (∼40-50%) superior in terms of specific stiffness when compared to the structures where this was not the case. The Graded strategy was found to be the most desirable from both the design and manufacturing perspective. The presented pros-and-cons for the various proposed design strategies aim to provide insight into their suitability in meeting the challenges faced by the AM design community.

Subfields: Civil and Structural Engineering, Mechanical Engineering, Mechanics of Materials

View Paper: https://www.semanticscholar.org/paper/8c343ce9a2ecb4e2e8f1814526d288d52f89e060

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In Civil and Structural Engineering

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Citations in the corpus

Effective design and simulation of surface-based lattice structures featuring volume fraction and cell type grading (2018, methodology): “But an unpenalised TO solution, which prescribes material densities lying between void and solid, can only be manufactured through the use of lattice structures [22,24].”
Triply periodic minimal surface (TPMS) porous structures: from multi-scale design, precise additive manufacturing to multidisciplinary applications (2022, methodology): “different design strategies [150] as illustrated in figure 13(d).”
Review of defects in lattice structures manufactured by powder bed fusion (2019, background): “2 Types of unit cells: a bodycentred cubic, b face-centred cubic, c gyroid (skeletal/network) and d double gyroid (sheet/ matrix) [33] Int J Adv Manuf Technol”