Journal
COMPUTER-AIDED DESIGN
Volume 81, Issue -, Pages 70-80Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cad.2016.09.007
Keywords
Length scale control; Level set; Topology optimization; Machinability
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Funding
- China Scholarship Council (CSC) [2011637036]
- Natural Sciences and Engineering Research Council of Canada (NSERC) [RGPIN-2014-05641]
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This paper presents a minimum void length scale control method for structural topology optimization. Void length scale control has been actively investigated for decades, which intends to ensure the topology design manufacturable given the machining tool access. However, only a single lower bound has been applied in existing methods, which does not fit the multi-stage rough-to-finish machining. To fix this issue, the proposed minimum void length scale control method employs double lower bounds which corresponds to the rough and finish machining operations, respectively. This method has been implemented under the level set framework. For technical details, the rough machining lower bound is satisfied by developing a signed distance-related constraint, which ensures enough space for the rough machining tool movement and thus, guarantees the machining efficiency. The finish machining lower bound is addressed through the curvature flow control, which ensures the small features manufacturable and also a good finish dimension and surface. Through a few numerical case studies, it is proven that the minimum void length scale can be effectively controlled without sacrificing much of the structural performance. (C) 2016 Elsevier Ltd. All rights reserved.
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