Density-Sensitive Implicit Functions Using Sub-Voxel Sampling in Additive Manufacturing
| العنوان: | Density-Sensitive Implicit Functions Using Sub-Voxel Sampling in Additive Manufacturing |
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| المؤلفون: | Jorge Posada, Juan Pareja-Corcho, Aitor Moreno, Diego Montoya-Zapata, Oscar Ruiz-Salguero |
| المصدر: | Metals Volume 9 Issue 12 |
| بيانات النشر: | Multidisciplinary Digital Publishing Institute, 2019. |
| سنة النشر: | 2019 |
| مصطلحات موضوعية: | Schwarz Primitive, lattice structure, 0209 industrial biotechnology, Implicit function, Computer science, Topology optimization, Metals and Alloys, Boundary (topology), Sampling (statistics), Context (language use), 02 engineering and technology, Function (mathematics), 3D printing, 021001 nanoscience & nanotechnology, Topology, Industry 4.0, 020901 industrial engineering & automation, Lattice (order), General Materials Science, 0210 nano-technology, Realization (systems), additive manufacturing, topology optimization |
| الوصف: | In the context of lattice-based design and manufacturing, the problem of physical realization of density maps into lattices of a particular family is central. Density maps are prescribed by design optimization algorithms, which seek to fulfill structural demands on a workpiece, while saving material. These density maps cannot be directly manufactured since local graded densities cannot be achieved using the bulk solid material. Because of this reason, existing topology optimization approaches bias the local voxel relative density to either 0 (void) or 1 (filled). Additive manufacturing opens possibilities to produce graded density individuals belonging to different lattice families. However, voxel-level sampled boundary representations of the individuals produce rough and possibly disconnected shells. In response to this limitation, this article uses sub-voxel sampling (largely unexploited in the literature) to generate lattices of graded densities. This sub-voxel sampling eliminates the risk of shell disconnections and renders better surface continuity. The manuscript devises a function to produce Schwarz cells that materialize a given relative density. This article illustrates a correlation of continuity against stress concentration by simulating C 0 and C 1 inter-lattice continuity. The implemented algorithm produces implicit functions and thus lattice designs which are suitable for metal additive manufacturing and able to achieve the target material savings. The resulting workpieces, produced by outsource manufacturers, are presented. Additional work is required in the modeling of the mechanical response (stress/strain/deformation) and response of large lattice sets (with arbitrary geometry and topology) under working loads. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| تدمد: | 2075-4701 |
| DOI: | 10.3390/met9121293 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::15100b4b598891341e86e9e9d9a9ddfbTest |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....15100b4b598891341e86e9e9d9a9ddfb |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20754701 |
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| DOI: | 10.3390/met9121293 |