A voxel-based method of constructing and skinning conformal and functionally graded lattice structures suitable for additive manufacturing
A voxel-based method of constructing and skinning conformal and functionally graded lattice structures suitable for additive manufacturing
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DOI：
10.1016/j.addma.2016.10.006
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发表时间：
2017-01-01
影响因子：
11
通讯作者：
Tuck, C.
中科院分区：
文献类型：
--
作者：
Aremu, A. O.;Brennan-Craddock, J. P. J.;Tuck, C.
增材制造（AM）能够生产难以通过其他方式制造的几何复杂零件。然而，传统的CAD系统是有限的，在这些部分的表示。当晶格结构被组合或嵌入复杂几何形状中时，该问题加剧。本文提出了一种计算效率高，体素为基础的方法生成的格子组成的几乎任何细胞类型，可以符合任意的外部几何形状。符合的方法涉及到镶嵌和修剪单位单元，可以在表面留下“悬挂”支柱，这是结构中可能的薄弱点。还描述了一种连接这些支柱以形成外部二维网格（称为“网皮”）的方法。制造晶格结构的传统方法通常不允许结构内的单元属性发生变化;然而，增材制造能够生成可能更优化的分级晶格。因此，还描述了一种功能分级晶格的方法，以利用这种制造能力。(C)2016作者由爱思唯尔公司出版
Additive Manufacturing (AM) enables the production of geometrically complex parts that are difficult to manufacture by other means. However, conventional CAD systems are limited in the representation of such parts. This issue is exacerbated when lattice structures are combined or embedded within a complex geometry. This paper presents a computationally efficient, voxel-based method of generating lattices comprised of practically any cell type that can conform to an arbitrary external geometry. The method of conforming involves the tessellation and trimming of unit cells that can leave 'hanging' struts at the surface, which is a possible point of weakness in the structure. A method of joining these struts to form an external two dimensional lattice, termed a 'net-skin' is also described. Traditional methods of manufacturing lattice structures generally do not allow variation of cell properties within a structure; however, additive manufacturing enables graded lattices to be generated that are potentially more optimal. A method of functionally grading lattices is, therefore, also described to take advantage of this manufacturing capability. (C) 2016 The Authors. Published by Elsevier B.V.