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Overhang control based on front propagation in 3D topology optimization for additive manufacturing

机译：基于拓扑拓扑优化对加性制造的悬垂控制

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摘要

It is attractive to combine topology optimization (TO) with additive manufacturing (AM), due to the design freedom provided by AM, and the increased performance that can be achieved with TO. One important aspect is to include the design rules associated with the process restrictions of AM to prevent the requirement of relatively large support volumes during printing. This paper presents a TO filter that enforces a minimum overhang angle, resulting in an optimized topology that is printable without the need for support structures. The filter is based on front propagation, which, as it is described by a PDE, allows for a straightforward application on unstructured meshes, to enforce an arbitrary overhang angle. Efficient algorithms developed for front propagation are used in combination with adjoint sensitivities, in order to have a minor influence on the total computational cost. The focus of this work is on the implementation of the filter for high resolution 3D cases, which requires development of the front propagation for tetrahedral elements, and its parallelization. (C) 2020 The Author(s). Published by Elsevier B.V.
机译：由于AM提供的设计自由，将拓扑优化（至）与添加剂制造（AM）结合起来是有吸引力的，并且由于AM提供的设计自由度，以及可以通过的性能增加。一个重要方面是包括与AM的过程限制相关联的设计规则，以防止在打印期间需要相对大的支撑体积。本文介绍了一个过滤器，该滤波器强制执行最小悬角，导致可打印的优化拓扑，而无需支持结构。滤波器基于前沿传播，如PDE所描述的，允许在非结构化网格上直接施加，以实施任意突出角。为前传播开发的高效算法与伴随感性结合使用，以便对总计算成本进行微小的影响。这项工作的焦点是对高分辨率3D案例的过滤器的实现，这需要开发用于四面体元件的前传播及其并行化。 （c）2020提交人。由elsevier b.v出版。

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