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.采用熔融沉积成型（FFF）与泡沫灌注复合系统，完成闭孔泡沫填充点阵结构的多材料增材制造。本数据集涵盖不同压缩程度下泡沫填充点阵的压缩力学行为数据，并通过改变胞元尺寸，分别制备空心点阵与等质量点阵作为对照，与泡沫填充点阵进行性能对比。本次试验采用应变速率为5mm/min的准静态压缩方案，以获取点阵结构的滞后力学特性。循环加载试验共开展21个循环，以获得稳定的压缩循环响应。选取第1次与第21次循环的试验数据，用于评估所设计点阵的刚度、比能耗与比阻尼容量：刚度通过计算压缩循环初始阶段的最佳拟合直线斜率求得；比能耗通过将滞后回线面积除以对应设计点阵的单件自重计算得到；比阻尼容量则通过将滞后回线面积除以加载曲线下的面积计算得到。研究表明，泡沫填充可显著提升上述三项性能指标。