Reverte José María, Caminero Miguel Ángel, Chacón Jesús Miguel, García-Plaza Eustaquio, Núñez Pedro José, Becar Jean Paul
Escuela Técnica Superior de Ingeniería Industrial, IMACI, Universidad de Castilla-La Mancha, Campus Universitario s/n, 13071 Ciudad Real, Spain.
Escuela Técnica Superior de Ingeniería Industrial, INEI, Universidad de Castilla-La Mancha, Campus Universitario s/n, 13071 Ciudad Real, Spain.
Materials (Basel). 2020 Apr 19;13(8):1924. doi: 10.3390/ma13081924.
In this work, the effect of short carbon fibre (CF) on the mechanical and geometric properties of 3D printed polylactic acid (PLA) composite parts processed using the Fused Filament Fabrication (FFF) technique have been analysed. Tensile, flexural and interlaminar shear strength (ILSS) tests were performed to obtain the mechanical performance of the different samples. The surface quality and geometric accuracy of the printed specimens were also evaluated. Finally, Scanning Electron Microscope (SEM) images of the printed samples are analysed. The results revealed that the addition of carbon fibres effectively improved all assessed mechanical properties of PLA-CF composites as compared to the neat PLA. In particular, Flat PLA-CF samples showed an average increase in tensile performance of 47.1% for the tensile strength and 179.9% for the tensile stiffness in comparison to the neat PLA. From the flexural behaviour point of view, Flat PLA-CF samples revealed an increase in average flexural strength and stiffness of 89.75% and 230.95%, respectively in comparison to the neat PLA. Furthermore, PLA-CF samples depicted the best ILSS performance. In general, the use of short carbon fibre as reinforcement did not affect the dimensional accuracy of the PLA-CF samples, and even improved the surface roughness in certain cases, particularly in Flat and On-edge orientations.
在这项工作中，分析了短碳纤维（CF）对采用熔融长丝制造（FFF）技术加工的3D打印聚乳酸（PLA）复合材料部件的力学性能和几何性能的影响。进行了拉伸、弯曲和层间剪切强度（ILSS）测试，以获得不同样品的力学性能。还评估了打印试样的表面质量和几何精度。最后，分析了打印样品的扫描电子显微镜（SEM）图像。结果表明，与纯PLA相比，添加碳纤维有效地改善了PLA-CF复合材料所有评估的力学性能。特别是，与纯PLA相比，扁平PLA-CF样品的拉伸强度平均提高了47.1%，拉伸刚度平均提高了179.9%。从弯曲性能的角度来看，扁平PLA-CF样品的平均弯曲强度和刚度分别比纯PLA提高了89.75%和230.95%。此外，PLA-CF样品表现出最佳的ILSS性能。总体而言，使用短碳纤维作为增强材料不会影响PLA-CF样品的尺寸精度，甚至在某些情况下还改善了表面粗糙度，特别是在扁平和平边取向的情况下。
