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Additive manufacturing of PLA structures using fused deposition modelling: Effect of process parameters on mechanical properties and their optimal selection

机译：使用熔融沉积建模的PLA结构的增材制造：工艺参数对机械性能的影响及其最佳选择

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摘要

Fused deposition modelling is a rapidly growing additive manufacturing technology due to its ability to build functional parts having complex geometries. The mechanical properties of a built part depend on several process parameters. The aim of this study is to characterize the effect of build orientation, layer thickness and feed rate on the mechanical performance of PLA samples manufactured with a low cost 3D printer. Tensile and three-point bending tests are carried out to determine the mechanical response of the printed specimens. Due to the layer-by-layer process, 3D printed samples exhibit anisotropic behaviour. Upright orientation shows the lowest mechanical properties. On the other hand, on-edge and flat orientation show the highest strength and stiffness. From a layer thickness and feed rate point of view, it is observed that ductility decreases as layer thickness and feed rate increase. In addition, the mechanical properties increase as layer thickness increases and decrease as the feed rate increases for the upright orientation. However, the variations in mechanical properties with layer thickness and feed rate are of slight significance for on-edge and flat orientations, except in the particular case of low layer thickness. Finally, the practicality of the results is assessed by testing an evaluation structure. (C) 2017 Elsevier Ltd. All rights reserved.
机译：熔融沉积建模是一种快速发展的增材制造技术，因为它能够构建具有复杂几何形状的功能部件。零件的机械性能取决于几个工艺参数。这项研究的目的是表征构建方向，层厚度和进给速率对用低成本3D打印机制造的PLA样品的机械性能的影响。进行拉伸和三点弯曲测试以确定印刷样品的机械响应。由于逐层处理，因此3D打印的样品表现出各向异性的行为。直立取向显示最低的机械性能。另一方面，边缘和平面方向显示出最高的强度和刚度。从层厚度和进料速度的观点来看，观察到延展性随着层厚度和进料速度的增加而降低。另外，机械性能随着层厚度的增加而增加，并且随着进给速率的增加而降低，从而导致机械性能下降。但是，机械性能随层厚度和进给速度的变化对于边缘和平面取向而言意义不大，除非在低层厚度的特殊情况下如此。最后，通过测试评估结构来评估结果的实用性。 （C）2017 Elsevier Ltd.保留所有权利。

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