Vakharia Ved S, Kuentz Lily, Salem Anton, Halbig Michael C, Salem Jonathan A, Singh Mrityunjay
NASA Pathway Intern, Department of Mechanical and Aerospace Engineering, University of California, San Diego, CA 92092, USA.
NASA Intern Currently at Department of Geology, University of Oregon, Eugene, OR 97403, USA.
Polymers (Basel). 2021 Oct 14;13(20):3545. doi: 10.3390/polym13203545.
Affordable commercial desktop 3-D printers and filaments have introduced additive manufacturing to all disciplines of science and engineering. With rapid innovations in 3-D printing technology and new filament materials, material vendors are offering specialty multifunctional metal-reinforced polymers with unique properties. Studies are necessary to understand the effects of filament composition, metal reinforcements, and print parameters on microstructure and mechanical behavior. In this study, densities, metal vol%, metal cross-sectional area %, and microstructure of various metal-reinforced Polylactic Acid (PLA) filaments were characterized by multiple methods. Comparisons are made between polymer microstructures before and after printing, and the effect of printing on the metal-polymer interface adhesion has been demonstrated. Tensile response and fracture toughness as a function of metal vol% and print height was determined. Tensile and fracture toughness tests show that PLA filaments containing approximately 36 vol% of bronze or copper particles significantly reduce mechanical properties. The mechanical response of PLA with 12 and 18 vol% of magnetic iron and stainless steel particles, respectively, is similar to that of pure PLA with a slight decrease in ultimate tensile strength and fracture toughness. These results show the potential for tailoring the concentration of metal reinforcements to provide multi-functionality without sacrificing mechanical properties.
价格实惠的商用桌面3D打印机和打印丝已将增材制造引入到所有科学和工程学科。随着3D打印技术和新型打印丝材料的快速创新，材料供应商正在提供具有独特性能的特种多功能金属增强聚合物。有必要开展研究以了解打印丝成分、金属增强材料和打印参数对微观结构和力学行为的影响。在本研究中，通过多种方法对各种金属增强聚乳酸（PLA）打印丝的密度、金属体积百分比、金属横截面积百分比和微观结构进行了表征。对打印前后的聚合物微观结构进行了比较，并证明了打印对金属-聚合物界面附着力的影响。确定了拉伸响应和断裂韧性与金属体积百分比和打印高度的函数关系。拉伸和断裂韧性测试表明，含有约36体积%青铜或铜颗粒的PLA打印丝会显著降低力学性能。分别含有12体积%和18体积%磁铁和不锈钢颗粒的PLA的力学响应与纯PLA相似，极限拉伸强度和断裂韧性略有下降。这些结果表明，在不牺牲力学性能的情况下，通过调整金属增强材料的浓度来实现多功能性具有潜力。
