Park Kwang-Min, Min Kyung-Sung, Roh Young-Sook
Construction Technology Research Centre, Construction Division, Korea Conformity Laboratories, Seoul 08503, Korea.
Architectural Engineering Program, Department of Architectural Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea.
Materials (Basel). 2021 Dec 23;15(1):97. doi: 10.3390/ma15010097.
Additive manufacturing enables innovative structural design for industrial applications, which allows the fabrication of lattice structures with enhanced mechanical properties, including a high strength-to-relative-density ratio. However, to commercialize lattice structures, it is necessary to define the designability of lattice geometries and characterize the associated mechanical responses, including the compressive strength. The objective of this study was to provide an optimized design process for lattice structures and develop a lattice structure characterization database that can be used to differentiate unit cell topologies and guide the unit cell selection for compression-dominated structures. Linear static finite element analysis (FEA), nonlinear FEA, and experimental tests were performed on 11 types of unit cell-based lattice structures with dimensions of 20 mm × 20 mm × 20 mm. Consequently, under the same relative density conditions, simple cubic, octahedron, truncated cube, and truncated octahedron-based lattice structures with a 3 × 3 × 3 array pattern showed the best axial compressive strength properties. Correlations among the unit cell types, lattice structure topologies, relative densities, unit cell array patterns, and mechanical properties were identified, indicating their influence in describing and predicting the behaviors of lattice structures.
增材制造为工业应用带来了创新的结构设计，能够制造出具有增强机械性能的晶格结构，包括高强度与相对密度比。然而，要使晶格结构商业化，有必要定义晶格几何形状的可设计性，并表征相关的机械响应，包括抗压强度。本研究的目的是提供一种晶格结构的优化设计流程，并开发一个晶格结构表征数据库，该数据库可用于区分单胞拓扑结构，并指导以压缩为主的结构的单胞选择。对11种尺寸为20毫米×20毫米×20毫米的基于单胞的晶格结构进行了线性静态有限元分析（FEA）、非线性FEA和实验测试。结果表明，在相同的相对密度条件下，具有3×3×3阵列模式的简单立方、八面体、截顶立方体和截顶八面体基晶格结构表现出最佳的轴向抗压强度性能。确定了单胞类型、晶格结构拓扑、相对密度、单胞阵列模式和机械性能之间的相关性，表明它们在描述和预测晶格结构行为方面的影响。
