Journal article
Minimum Compliance Topology Optimization of Shell-Infill Composites for Additive Manufacturing
Additively manufactured parts are often composed of two sub-structures, a solid shell forming their exterior and a porous infill occupying the interior. To account for this feature this paper presents a novel method for generating simultaneously optimized shell and infill in the context of minimum compliance topology optimization.
Our method builds upon two recently developed approaches that extend density-based topology optimization: A coating approach to obtain an optimized shell that is filled uniformly with a prescribed porous base material, and an infill approach which generates optimized, non-uniform infill within a prescribed shell.
To evolve the shell and infill concurrently, our formulation assigns two sets of design variables: One set defines the base and the coating, while the other set defines the infill structures. The resulting intermediate density distributions are unified by a material interpolation model into a physical density field, upon which the compliance is minimized.
Enhanced by an adapted robust formulation for controlling the minimum length scale of the base, our method generates optimized shell-infill composites suitable for additive manufacturing. We demonstrate the effectiveness of the proposed method on numerical examples, and analyze the influence of different design specifications.
Language: | English |
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Year: | 2017 |
Pages: | 358-375 |
ISSN: | 18792138 and 00457825 |
Types: | Journal article |
DOI: | 10.1016/j.cma.2017.08.018 |
ORCIDs: | Clausen, Anders and Sigmund, Ole |