Boursier Niutta Carlo, Ciardiello Raffaele, Tridello Andrea
Department of Mechanical and Aerospace Engineering, Politecnico di Torino, 10129 Turin, Italy.
Polymers (Basel). 2022 Mar 10;14(6):1116. doi: 10.3390/polym14061116.
In this work, an experimental and numerical analysis of a lattice structure for energy absorption was carried out. The goal was to identify the most influencing parameters of the unit cell on the crushing performances of the structure, thus guiding the design of energy absorbers. Two full factorial plans of compression tests on cubic specimens of carbon nylon produced by fused deposition modeling (FDM) were performed. The factors were the beam diameter and the number of unit cells. In the first factorial plan, the specimen volume is constant and the dimensions of the unit cell are varied, while the second factorial plan assumes a constant size of the unit cell and the volume changes in accordance with their number. The results showed that the specific energy absorption increases with the diameter of the beam and decreases with the size of the unit cell. Based on these results, a crash absorber for the segment C vehicle was designed and compared with the standard component of the vehicle made of steel. In addition to a mass reduction of 25%, the improved crushing performances of the lattice structure are shown by the very smooth force-displacement curve with limited peaks and valleys.
在这项工作中，对一种用于能量吸收的晶格结构进行了实验和数值分析。目的是确定晶胞对结构压缩性能影响最大的参数，从而指导能量吸收器的设计。对通过熔融沉积建模（FDM）生产的碳尼龙立方试样进行了两个全因子压缩试验方案。因素是梁直径和晶胞数量。在第一个因子方案中，试样体积恒定，晶胞尺寸变化，而第二个因子方案假设晶胞尺寸恒定，体积根据其数量变化。结果表明，比能量吸收随梁直径增加而增加，随晶胞尺寸减小而减小。基于这些结果，设计了一种用于C段车辆的碰撞吸收器，并与车辆的钢制标准部件进行了比较。除了质量减轻25%外，晶格结构改善的压缩性能还体现在力-位移曲线上，该曲线非常平滑，峰值和谷值有限。
