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Laser polishing of Cu/PLA composite parts fabricated by fused deposition modeling: Analysis of surface finish and mechanical properties
Polymer Composites ( IF 5.2 ) Pub Date : 2019-11-25 , DOI: 10.1002/pc.25459
Lan Chen 1, 2 , Xinzhou Zhang 1, 2 , Yuan Wang 1 , Tim A. Osswald 2
Affiliation  

Fused deposition modeling (FDM) technology decreases production time and cost in engineering industry, but with typical low surface quality. In this study, laser polishing was employed to improve surface quality of copper fiber/polylactide acid (Cu/PLA) composite parts fabricated by FDM. Surface roughness, surface morphology, dynamic mechanical analysis (DMA), and tensile properties were studied. The results showed that after laser polishing, the surface roughness was reduced by more than 91% (from 10.52 to 0.87 μm Sa) at the optimized parameters (the laser power of 5 W and the laser beam diameter of 200 μm). Laser polishing can effectively remove surface defects formed during FDM. DMA showed that the storage modulus, loss modulus, and glass transition temperature of Cu/PLA composites were significantly improved, because the Cu fibers and PLA matrix formed a strong interfacial adhesion after treatment. Moreover, the tensile strength and Young's modulus of the Cu/PLA composites sample also improved by laser polishing. The fracture morphologies were observed, and the possible strengthening mechanism was also discussed.

中文翻译:

通过熔融沉积建模对Cu / PLA复合零件进行激光抛光:表面光洁度和机械性能分析

熔融沉积建模(FDM)技术减少了工程行业的生产时间和成本,但具有典型的低表面质量。在这项研究中,采用激光抛光来改善由FDM制造的铜纤维/聚乳酸(Cu / PLA)复合零件的表面质量。研究了表面粗糙度,表面形态,动态力学分析(DMA)和拉伸性能。结果表明,激光抛光之后,表面粗糙度降低了超过91%(从10.52到0.87微米)的最佳参数(5 W的激光功率和200μm的激光束直径)。激光抛光可以有效去除FDM期间形成的表面缺陷。DMA表明,Cu / PLA复合材料的储能模量,损耗模量和玻璃化转变温度得到了显着提高,这是因为处理后Cu纤维和PLA基体形成了很强的界面粘合力。此外,通过激光抛光,Cu / PLA复合材料样品的拉伸强度和杨氏模量也得到了改善。观察了断裂形态,并讨论了可能的加强机理。
更新日期:2019-11-25
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