Automated lofting-based reconstruction of CAD models from 3D topology optimization results


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Amroune, A., Cuillière, J.-C. et François, V. (2022). Automated lofting-based reconstruction of CAD models from 3D topology optimization results. Computer-Aided Design, 145 . Article 103183. ISSN 0010-4485 DOI 10.1016/j.cad.2021.103183

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Topology optimization (TO) has become an integral part of the structural design process in recent years. However, automatically deriving parametrized Computer-Aided Design (CAD) models from TO results still represents a great challenge. In this paper, we present a new fully automatic process aimed at converting 3D TO results that tend towards beam-like structures into solid CAD models. Our reconstruction process starts with curve-skeletonization of the optimized shape. The curve-skeleton obtained is used alongside with a boundary triangulation of the optimized shape to compute closed cross-sections along the skeleton branches and junctions at the intersection between branches. These cross-sections are interpolated with cubic B-spline fitting curves, which are used as a basis for lofting operations to generate CAD surface representations of branches and junctions of the optimized shape. Remaining openings in the optimized shape boundary are closed with filling surfaces. A solid CAD model can be built by sewing together all created surfaces and filling, by the way, the closed boundary that comes out of this process. Finite Element Analysis (FEA) is carried out on both the 3D optimal shape and the CAD solid model derived in order to validate this CAD model. Several case studies are presented to demonstrate effectiveness and usefulness of this new approach.

Type de document: Article
Mots-clés libres: Topology optimization SIMP Reconstruction CAD Curve-skeleton Beam-like structure
Date de dépôt: 25 avr. 2022 12:51
Dernière modification: 04 avr. 2024 04:00
Version du document déposé: Post-print (version corrigée et acceptée)

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