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• W2976144390 abstract "This paper presents an adaptive discretization strategy for level set topology optimization of structures based on hierarchical B-splines. This work focuses on the influence of the discretization approach and the adaptation strategy on the optimization results and computational cost. The geometry of the design is represented implicitly by the iso-contour of a level set function. An immersed boundary technique, here the extended finite element method, is used to predict the structural response. Both the level set function and the state variable fields are discretized by hierarchical B-splines. While only first-order B-splines are used for the state variable fields, up to third order B-splines are considered for discretizing the level set function. The discretizations of the level set function and the state variable fields are locally refined along the material interfaces and selectively coarsened within the bulk phases. For locally refined/coarsened meshes, truncated B-splines are considered. The properties of the proposed mesh adaptation strategy are studied for level set topology optimization where either the initial design is comprised of a uniform array of inclusions or inclusions are generated during the optimization process. Numerical studies employing static linear elastic material/void problems in 2D and 3D demonstrate the ability of the proposed method to start from a coarse mesh and converge to designs with complex geometries and fine features, reducing the overall computational cost. Comparing optimization results for different B-spline orders suggests that higher order basis functions promote the development of smooth designs and suppress the emergence of small features, without providing an explicit feature size control. A distinct advantage of cubic over quadratic B-splines is not observed." @default.
• W2976144390 created "2019-10-03" @default.
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• W2976144390 date "2019-09-23" @default.
• W2976144390 modified "2023-09-27" @default.
• W2976144390 title "Adaptive level set topology optimization using hierarchical B-splines" @default.
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• W2976144390 doi "https://doi.org/10.48550/arxiv.1909.10607" @default.
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