ABSTRACT

This present study focuses on evaluation of mechanical properties of three dimensional (3D)-printed carbon fiber/polylactic acid (CF/PLA) composites, using fused deposition modeling (FDM) technique. The composites were prepared with different slicing parameters: layer heights or thicknesses, infill densities and layer patterns. The 3D-printed composite samples were subjected to tensile, flexural and interlaminar shear strength (ILSS) tests to assess the influence of the process parameters on their mechanical characteristics. Further investigations were carried out to evaluate the effect of surface roughness of the samples. From the test results, it was evident that both rectilinear and hexagonal layer patterns exhibited better mechanical properties at infill density and layer thickness of 60% and 0.64 mm, respectively. The scanning electron microscopy (SEM) images depicted that lesser layer thickness produced poor CF/PLA interfacial bonding and major failure mode was traced to fiber pull-out. Therefore, engineering application of the composite samples depends on their slicing parameters.

摘要

本研究的重点是使用熔融沉积建模 (FDM) 技术评估三维 (3D) 打印碳纤维/聚乳酸 (CF/PLA) 复合材料的机械性能。使用不同的切片参数制备复合材料：层高或厚度、填充密度和层图案。对 3D 打印的复合材料样品进行拉伸、弯曲和层间剪切强度 (ILSS) 测试，以评估工艺参数对其机械特性的影响。进行了进一步的研究以评估样品表面粗糙度的影响。从测试结果可以看出，在填充密度和层厚分别为 60% 和 0.64 mm 时，直线和六边形层图案都表现出更好的机械性能。扫描电子显微镜 (SEM) 图像显示，较薄的层厚度产生较差的 CF/PLA 界面粘合，主要失效模式可追溯到纤维拉出。因此，复合样品的工程应用取决于其切片参数。