3D打印轻质复合材料泡沫
3D Printed Lightweight Composite Foams
摘要：
本文的目标是通过将中空玻璃微球（GMB）与高密度聚乙烯（HDPE）混合来实现3D打印的轻质复合泡沫。为此，开发了用于打印复合泡沫复合材料的轻质原料。通过改变HDPE中的GMB含量（20、40和60体积%）来制备用于长丝挤出的共混物，其随后用于三维打印（3DP）。研究了共混物的流变性能和熔体流动指数（MFI），以确定合适的印刷参数。观察到储能和损耗模量以及复数粘度随着GMB含量的增加而增加，而MFI则降低。此外，HDPE和泡沫长丝的热膨胀系数随着GMB含量的增加而降低，从而降低印刷品中的热应力，这促进了翘曲的减少。长丝的机械性能通过对其进行拉伸测试来确定，而3D打印样品则在拉伸和弯曲测试下进行测试。与HDPE相比，长丝的拉伸模量随着GMB含量的增加（8-47%）而增加，并表现出相当的长丝强度。与纯HDPE相比，3D打印泡沫显示出更高的比拉伸和弯曲模量，使其成为重量敏感应用的合适候选材料。具有60体积%GMB的HDPE表现出最高的模量，并且比印刷的HDPE高48.02%。最后，性能图显示了相对于注塑和压缩成型泡沫的更高模量和相当的强度。印刷泡沫的模量比模塑样品高1.8倍。因此，3D打印泡沫有可能取代通过传统制造工艺加工的部件，这些工艺在几何复杂设计、交货时间和相关成本方面存在局限性。
英文摘要：
The goal of this paper is to enable 3D printed lightweight composite foams by blending hollow glass micro balloons (GMB) with high density polyethylene (HDPE). To that end, lightweight feedstock for printing syntactic foam composites is developed. The blend for this is prepared by varying GMB content (20, 40, and 60 volume %) in HDPE for filament extrusion, which is subsequently used for three-dimensional printing (3DP). The rheological properties and the melt flow index (MFI) of blends are investigated for identifying suitable printing parameters. It is observed that the storage and loss modulus, as well as complex viscosity, increases with increasing GMB content, whereas MFI decreases. Further, the coefficient of thermal expansion of HDPE and foam filaments decreases with increasing GMB content, thereby lowering the thermal stresses in prints, which promotes the reduction in warpage. The mechanical properties of filaments are determined by subjecting them to tensile tests, whereas 3D printed samples are tested under tensile and flexure tests. The tensile modulus of the filament increases with increasing GMB content (8-47%) as compared to HDPE and exhibit comparable filament strength. 3D printed foams show higher specific tensile and flexural modulus as compared to neat HDPE, making them suitable candidate materials for weight sensitive applications. HDPE having 60% by volume GMB exhibited the highest modulus and is 48.02% higher than the printed HDPE. Finally, the property map reveals higher modulus and comparable strength against injection and compression molded foams. Printed foam registered 1.8 times higher modulus than molded samples. Hence, 3D printed foams have the potential for replacing components processed through conventional manufacturing processes that have limitations on geometrically complex designs, lead time, and associated costs.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
