Computational synthesis of large-scale three-dimensional heterogeneous lattice structures
Computational synthesis of large-scale three-dimensional heterogeneous lattice structures
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DOI：
10.1016/j.ast.2021.107258
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发表时间：
2021-12
影响因子：
5.6
通讯作者：
Zhichao Wang;A. Tamijani
中科院分区：
文献类型：
--
作者：
Zhichao Wang;A. Tamijani
本文描述了一种设计三维非均匀（异质）晶格结构的材料分布和取向的方法。增材制造的最新进展使制造跨越多个长度尺度。基于均匀化的设计优化和优化设计的后续投影有助于形成轻量化仿生设计的大规模微结构的合成。本研究的主要方面是（a）的建设，基于均匀化的优化，并具有不同程度的各向异性和（B）的分析，优化和投影框架，以处理大规模的网格，并获得高分辨率，异构晶格结构的两种类型的投影。选择立方体和八重桁架网格来展示框架设计不同类型网格的能力。使用优化和投影框架设计了四轴飞行器臂和内部机翼结构，验证了其为复杂设计领域综合异构网格结构的能力。讨论了利用晶格的特征参数改变优化微晶格的复杂性的能力。的晶格各向异性和优化，平滑的取向之间的关系进行了研究，并为每个晶格的优化设计与使用常规的设计优化程序得到的那些进行了比较。
This paper describes a methodology for designing the material distribution and orientation of three-dimensional non-uniform (heterogeneous) lattice structures. Recent advances in additive manufacturing enable fabrication across multiple length scales. Homogenization-based design optimization and the subsequent projection of the optimized design facilitate the synthesis of large-scale microstructures that form lightweight bionic designs. The main aspects of this research are (a) the construction, homogenization-based optimization, and projection of two types of lattices with different degrees of anisotropy and (b) the parallelization of the analysis, optimization, and projection framework in order to handle large-scale meshes and obtain high-resolution, heterogeneous lattice structures. Cubic and octet-truss lattices were selected to demonstrate the ability of the framework to design different types of lattices. A quadcopter arm and an internal wing structure were designed using the optimization and projection framework, verifying its capability to synthesize heterogeneous lattice structures for complex design domains. The ability to change the complexity of optimized microlattices using the characteristic parameters of the lattice is discussed. The relationship between the lattice anisotropy and the optimized, smoothed orientation is investigated, and the optimized design for each lattice is compared with those obtained using conventional design optimization procedures.