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Simultaneous optimization of build orientation and topology for additive manufacturing
Additive Manufacturing ( IF 11.0 ) Pub Date : 2020-05-11 , DOI: 10.1016/j.addma.2020.101246
Cunfu Wang , Xiaoping Qian

The paper presents a method to optimize build orientation and topological layout simultaneously in density-based topology optimization for additive manufacturing. Support structures are required in additive manufacturing of parts of complex shape. To eliminate or reduce support structures during the additive processes, we constrain the lower bound of the overhang angle of the optimized design. In this method, the build orientation and the density field used to represent the part are simultaneously optimized to satisfy the overhang angle constraints for part self-support. While these angle constraints are locally defined on every material point over the design domain, they are transformed into two global constraints through the Heaviside projection-based aggregations. The first directional gradient based global constraint controls the overhang angle of the solid/void interface inside the design domain to eliminate the internal supports. The second density-based global constraint controls the angle of the design domain boundary to reduce the external supports. Numerical examples on both 2D and 3D linear elastic problems are presented to demonstrate the validity and efficiency of the proposed formulations in the build orientation optimization and in the overhang angle control.



中文翻译:

同时优化增材制造的建造方向和拓扑

本文提出了一种在增材制造的基于密度的拓扑优化中同时优化构建方向和拓扑布局的方法。在复杂形状零件的增材制造中需要支撑结构。为了在添加过程中消除或减少支撑结构,我们限制了优化设计的悬垂角的下限。在这种方法中,同时优化了用于表示零件的构造方向和密度场,以满足零件自支撑的悬垂角度约束。虽然这些角度约束是在设计域上的每个物料点上局部定义的,但它们通过基于Heaviside投影的聚合转换为两个全局约束。第一个基于方向梯度的全局约束控制设计域内部的实体/空隙界面的悬垂角,以消除内部支撑。第二个基于密度的全局约束控制设计域边界的角度,以减少外部支撑。给出了有关2D和3D线性弹性问题的数值示例,以证明所提出的公式在构造方向优化和悬垂角控制中的有效性和效率。

更新日期:2020-05-11
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