Multi-material additive manufacturing with lightweight closed-cell foam-filled lattice structures for enhanced mechanical and functional properties

Multi-material additive manufacturing of closed-cell foam-filled lattice structures is done using a hybrid FFF and foam-filling system. The data shows the compressive behaviour of foam-filled lattices for different compression levels and is compared with empty and equivalent weight lattices by varying unit cell size. Quasi-static compression testing is done at a strain rate of 5mm/min to acquire the hysteresis behaviour of the lattice structures. This cyclic testing is done for 21 cycles to obtain a stable compression cycle. 1st and 21st cycles have been taken to evaluate stiffness, specific energy dissipation and specific damping capacity of the designed lattices. The stiffness is evaluated by taking the slope of the best-fitted line at the start of the compression cycle. Specific energy dissipation is calculated by dividing hysteresis area over the individual weight of each of the designed lattices. Specific damping capacity is calculated by dividing the hysteresis area over the area under the loading curve. All three properties were found to be enhanced with foam filling.

采用混合FFF和泡沫填充系统的多材料闭孔泡沫填充格子结构进行增材制造。数据展示了不同压缩等级下泡沫填充格子的压缩性能，并通过改变单元细胞尺寸与空格子和等效重量格子进行比较。在应变率为5mm/min的准静态压缩测试下，获取了格子结构的滞后行为。进行21个循环的周期性测试，以获得稳定的压缩循环。第1个和第21个循环被用于评估设计格子的刚度、比能耗散和比阻尼能力。刚度通过压缩周期开始时最佳拟合线的斜率进行评估。比能耗散通过将滞后面积除以设计格子的个别重量来计算。比阻尼能力通过将滞后面积除以加载曲线下的面积来计算。研究发现，泡沫填充增强了这三种性能。