Rossiter Jayme D, Johnson Andrew A, Bingham Guy A
School of Design and Creative Arts, Loughborough University, Loughborough, United Kingdom.
School of Design, De Montfort University, Leicester, United Kingdom.
3D Print Addit Manuf. 2020 Feb 1;7(1):19-27. doi: 10.1089/3dp.2019.0030. Epub 2020 Feb 13.
With additive manufacturing increasingly being embraced in the area of sports technology, focus has shifted toward cellular structures for impact protection. Periodic lattice structures can be tailored for a specific response by modifying the geometry of individual cells, with the structure capable of being modified to conform around a given body. However, the effect of modifying specific design characteristics within a lattice and the interrelationships between them are not well understood. This study examines five geometric design variables: cell width, strut cross-sectional area (CSA), strut shape, cell orientation, and joint filleting, and their effect on the compressive behavior of a lattice structure. Truncated octahedron lattices were manufactured using nylon through the process of material extrusion and tested under compression at a constant strain rate of 1.0 s. Design of experiments was utilized to analyze the results by implementing a 2 factorial design. Results indicated that the strut CSA, cell width, and interaction between the two design characteristics had the largest effects on the plateau stress of the lattice and its energy capacity.
随着增材制造在体育技术领域越来越受到青睐，人们的关注点已转向用于冲击防护的蜂窝结构。周期性晶格结构可以通过修改单个单元的几何形状来定制特定的响应，这种结构能够被修改以贴合给定的身体部位。然而，在晶格内修改特定设计特征的效果以及它们之间的相互关系尚未得到充分理解。本研究考察了五个几何设计变量：单元宽度、支柱横截面积（CSA）、支柱形状、单元取向和接头圆角，以及它们对晶格结构压缩行为的影响。采用截顶八面体晶格，通过材料挤出工艺用尼龙制造，并在1.0 s的恒定应变速率下进行压缩测试。利用实验设计通过实施二因素设计来分析结果。结果表明，支柱CSA、单元宽度以及这两个设计特征之间的相互作用对晶格的平台应力及其能量容量影响最大。
