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首页> 外文期刊>Computers & Structures >Simultaneous design of the topology and the build orientation of Wire-and-Arc Additively Manufactured structural elements
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Simultaneous design of the topology and the build orientation of Wire-and-Arc Additively Manufactured structural elements

机译：同时设计拓扑结构和线弧呈加弧制造的结构元件的构建方向

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Wire-and-Arc Additive Manufacturing (WAAM) has been recently adopted to create innovative structural forms and architectural shapes. As shown by few experimental investigations, the layer-by-layer deposition induces a remarkable anisotropy in the elastic response of the WAAM-produced alloys. A suitable topology optimization technique is implemented to account for this peculiar behavior of the material, which is generally disregarded in design tools that are conceived for traditional manufacturing. First, an orthotropic material model is derived from the data of an experimental investigation that was recently performed on alloys made with 308LSi stainless steel wire feed. Then, an optimization procedure is implemented that exploits, as design variables, not only the density field of an orthotropic material phase, but also the orientation of the symmetry axes of such material with respect to a reference frame (i.e. the printing direction used to build the whole structural element). Minimum weight problems with displacement constraints are solved to find optimal solutions that are compared to those achieved by performing topology optimization with (i) isotropic stainless steel or with (ii) the WAAM-produced alloy for prescribed orientations. Numerical simulations assess that the printing direction remarkably affects the stiffness of the optimal layouts, as well as their topology. (C) 2020 Elsevier Ltd. All rights reserved.
机译：最近采用了线弧添加制造（WAAM）以创造创新的结构形式和建筑形状。如少数实验研究所示，逐层沉积在WaAM产生的合金的弹性响应中诱导显着的各向异性。实施了合适的拓扑优化技术以考虑材料的特殊行为，这些行为通常忽略在构思的传统制造的设计工具中。首先，从最近用308LSI不锈钢送料丝网制成的合金进行的实验研究数据来源于素材模型。然后，实现了优化过程，该优化过程作为设计变量，不仅是正交材料相的密度场，而且还实现了这种材料相对于参考帧的对称轴的取向（即用于构建的打印方向整个结构元素）。解决了位移约束的最小重量问题，以找到与通过使用（i）各向同性不锈钢或（ii）制作规定方向的WaAM制造合金实现的拓扑优化而实现的最佳解决方案。数值模拟评估印刷方向显着影响最佳布局的刚度，以及它们的拓扑。 （c）2020 elestvier有限公司保留所有权利。

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