Guerra Silva Rafael, Salinas Estay Cristóbal, Morales Pavez Gustavo, Zahr Viñuela Jorge, Torres María Josefina
School of Mechanical Engineering, Pontificia Universidad Católica de Valparaíso, Quilpué 2430000, Chile.
Materials (Basel). 2021 Mar 17;14(6):1462. doi: 10.3390/ma14061462.
Fused deposition modeling represents a flexible and relatively inexpensive alternative for the production of custom-made polymer lattices. However, its limited accuracy and resolution lead to geometric irregularities and poor mechanical properties when compared with the digital design. Although the link between geometric features and mechanical properties of lattices has been studied extensively, the role of manufacturing parameters has received little attention. Additionally, as the size of cells/struts nears the accuracy limit of the manufacturing process, the interaction between geometry and manufacturing parameters could be decisive. Hence, the influence of three geometric and two manufacturing parameters on the mechanical behavior was evaluated using a fractional factorial design of experiments. The compressive behavior of two miniature lattice structures, the truncated octahedron and cubic diamond, was evaluated, and multilinear regression models for the elastic modulus and plateau stress were developed. Cell size, unit cell type, and strut diameter had the largest impact on the mechanical properties, while the influence of feedstock material and layer thickness was very limited. Models based on factorial design, although limited in scope, could be an effective tool for the design of customized lattice structures.
熔融沉积成型是生产定制聚合物晶格的一种灵活且相对廉价的替代方法。然而，与数字设计相比，其有限的精度和分辨率会导致几何不规则以及机械性能不佳。尽管已经广泛研究了晶格的几何特征与机械性能之间的联系，但制造参数的作用却很少受到关注。此外，随着单元/支柱尺寸接近制造工艺的精度极限，几何形状与制造参数之间的相互作用可能起决定性作用。因此，使用分数析因实验设计评估了三个几何参数和两个制造参数对力学行为的影响。评估了两种微型晶格结构（截顶八面体和立方金刚石）的压缩行为，并建立了弹性模量和平台应力的多线性回归模型。单元尺寸、单胞类型和支柱直径对机械性能的影响最大，而原料材料和层厚的影响非常有限。基于析因设计的模型虽然范围有限，但可能是设计定制晶格结构的有效工具。
