Abstract In the present work, short carbon fiber reinforced polyamide 6 (CF/PA6) as fused deposition modelling (FDM) feedstock is developed in order to manufacture lightweight honeycomb structure with low cost and enhanced mechanical performance. The effects of processing parameters during FDM printing on mechanical properties and interlayer adhesion are investigated. First, tensile properties of FDM-printed CF/PA6 specimens with three different printing directions are evaluated. It is found that CF/PA6 printed along tensile loading direction exhibits higher tensile properties than the other two printing direction, indicating a strong anisotropy of mechanical properties adjusted by printing orientation. Secondly, build-plate temperature of FDM printer plays an important role in tensile performance of CF/PA6 specimens. With increasing build-plate temperature, an increase in tensile strength of FDM-printed CF/PA6 specimens is obtained. Also, the single lap-shear strength in printed CF/PA6 are improved by using high build-plate temperature, which is probably caused by the reduced voids and enhanced interlayer bonding. Finally, re-entrant honeycomb structures are successfully FDM-printed using fabricated CF/PA6 filaments, exhibiting remarkable energy absorption capacity and good rebound behavior. The present work provides a high-performance composite feedstock for FDM and key relationship between processing behavior and mechanical performance.

中文翻译：

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FDM印刷碳纤维增强聚酰胺6复合材料拉伸性能工艺参数研究

摘要 在目前的工作中，开发了短碳纤维增强聚酰胺 6 (CF/PA6) 作为熔融沉积建模 (FDM) 原料，以制造具有低成本和增强机械性能的轻质蜂窝结构。研究了 FDM 打印过程中的加工参数对机械性能和层间附着力的影响。首先，评估了具有三个不同打印方向的 FDM 打印 CF/PA6 试样的拉伸性能。发现沿拉伸载荷方向印刷的 CF/PA6 表现出比其他两个印刷方向更高的拉伸性能，表明通过印刷方向调整的机械性能具有很强的各向异性。其次，FDM 打印机的底板温度对 CF/PA6 试样的拉伸性能起着重要作用。随着构建板温度的升高，FDM 打印的 CF/PA6 试样的拉伸强度会增加。此外，印刷 CF/PA6 的单次搭接剪切强度通过使用高构建板温度得到改善，这可能是由于减少的空隙和增强的层间粘合引起的。最后，使用制造的 CF/PA6 长丝成功地 FDM 打印了可重入的蜂窝结构，表现出显着的能量吸收能力和良好的回弹行为。目前的工作为 FDM 提供了一种高性能复合原料，以及加工行为和机械性能之间的关键关系。这可能是由减少的空隙和增强的层间结合引起的。最后，使用制造的 CF/PA6 长丝成功地 FDM 打印了可重入的蜂窝结构，表现出显着的能量吸收能力和良好的回弹行为。目前的工作为 FDM 提供了一种高性能复合原料，以及加工行为和机械性能之间的关键关系。这可能是由减少的空隙和增强的层间结合引起的。最后，使用制造的 CF/PA6 长丝成功地 FDM 打印了可重入的蜂窝结构，表现出显着的能量吸收能力和良好的回弹行为。目前的工作为 FDM 提供了一种高性能复合原料，以及加工行为和机械性能之间的关键关系。