工艺与制造英文2021被引 41
基于同轴芳纶/PLA长丝的连续纤维增强复合材料3D打印
3D printing of a continuous fiber-reinforced composite based on a coaxial Kevlar/PLA filament
Trenton Cersoli, Bharat Yelamanchi, Eric MacDonald, J.G. Carrillo, Pedro Cortes · Youngstown State University
摘要整理
增材制造技术能够生产复杂和大规模定制的几何结构，但往往以牺牲力学性能为代价。通过制造复合材料零件可在一定程度上缓解这一问题。采用材料挤出增材制造工艺制造的热塑性结构，通过集成连续纤维可显著改善断裂韧性。本研究开发了一种连续增强长丝，用于开源熔融长丝制造（FFF）系统。将三种不同体积分数的芳纶纤维掺入聚乳酸（PLA）热塑性长丝中。研究表明，20%纤维体积分数时，增强件的拉伸强度相比未增强PLA件提高了一倍。对增强打印热塑性材料进行了高速冲击试验，结果显示纤维体积分数最高的复合材料相比纯PLA的抗冲击能量提高了4倍。增强纤维能够有效阻止射弹穿透，其穿透速度与穿透未增强PLA的速度相当。本研究证明了无需改装商用3D打印机挤出系统即可生产打印复合材料的可行性。该方法为生产具有高速冲击应用前景的连续增强3D打印热塑性零件提供了一种可行的替代工艺。
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