工艺与制造英文2020被引 186
工艺参数对3D打印连续碳纤维增强PLA复合材料拉伸力学性能的影响
Effect of Process Parameters on Tensile Mechanical Properties of 3D Printing Continuous Carbon Fiber-Reinforced PLA Composites
Hao Dou, Yunyong Cheng, Wenguang Ye, Dinghua Zhang, Junjie Li, Zhoujun Miao, Stephan Rudykh · Northwestern Polytechnical University
摘要整理
三维(3D)打印连续碳纤维增强聚乳酸(PLA)复合材料具有优异的拉伸力学性能。本研究通过一系列力学实验，系统研究了工艺参数对3D打印复合材料试样拉伸力学性能的影响规律。基于改进型熔融沉积成型(FDM)3D打印机，改变层厚、挤出宽度、打印温度和打印速度等主要工艺参数制备试样，并测试了连续碳纤维增强PLA复合材料的拉伸力学性能。实验结果表明，相对纤维含量对力学性能有显著影响，复合材料中碳纤维的比例受层厚和挤出宽度的控制。随着层厚和挤出宽度的增加，连续碳纤维增强复合材料的拉伸力学性能逐渐降低。打印温度和打印速度也影响纤维-基体界面性能，即拉伸力学性能随打印温度升高而增加，但随打印速度增加而降低。拉伸力学性能的增强机制在于外部载荷通过纤维-基体界面传递至碳纤维。扫描电子显微镜(SEM)观察表明，连续碳纤维增强3D打印复合材料的主要薄弱环节位于纤维-基体界面，主要失效模式为界面破坏导致的纤维拔出。
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