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Erschienen in:
2018 | OriginalPaper | Buchkapitel
Finding Optimized Layouts for Ribs on Surfaces Using the Graph and Heuristic Based Topology Optimization
verfasst von : Dominik Schneider, Axel Schumacher
Erschienen in: Advances in Structural and Multidisciplinary Optimization
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Abstract
A promising approach in reducing weight is using thin shell structures with supporting ribs instead of thick shell structures, in order to only use the material where it is needed. Nevertheless, the optimization of these structures remains a big challenge, especially in crash load cases, because of material nonlinearities, contact and large displacements.
The Graph and Heuristic Based Topology Optimization (GHT) presents a solution to generate better layouts for crashworthiness structures, but up to now it has mainly been used for the design of extrusion profiles with a uniform cross section. In order to apply this method to shell structures with ribs, the GHT is enhanced, so that the mathematical graph can represent ribs that are attached to a given surface, which has no undercuts in the area of the new ribs.
During the optimization with the GHT competing layouts with new ribs are suggested by already existing heuristics, which change the topology based on expert knowledge regarding crash applications with extrusion profiles. In a final shape and sizing optimization the thickness, curvature and height of the ribs as well as the thickness of the surface that they are attached to can be optimized. The responses of the optimization can include any value that can be extracted from the simulation results (e.g. accelerations).
This feature enables finding better layouts for thin walled crashworthiness structures with supporting ribs. Although causing a large simulation effort, it is one of the few methods that can provide an optimized solution for structures in crash applications in consideration of a wide range of manufacturing constraints and only using shell elements, which result in short calculation times during the simulation.