Processing-structure-property relationships of bisphenol-A-polycarbonate samples prepared by fused filament fabrication
Processing-structure-property relationships of bisphenol-A-polycarbonate samples prepared by fused filament fabrication
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DOI：
10.1016/j.addma.2020.101285
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发表时间：
2020-10-01
影响因子：
11
通讯作者：
Kang, Sung Hoon
中科院分区：
文献类型：
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作者：
Fang, Lichen;Yan, Yishu;Kang, Sung Hoon
熔丝制造（FFF）是最流行的增材制造工艺之一。然而，FFF的结构应用仍然受到印刷部件的机械强度和结构尺寸的不必要变化的限制。为了从根本上了解这些问题，我们专注于双酚A-聚碳酸酯样品的层间键合区域。样品由低成本的开源FFF 3D打印机制备，并使用X射线微计算机断层扫描（micro-CT）对其进行全三维（3D）几何表征。结果表明，根据不同的打印条件，包括打印速度，层高度和喷嘴温度的显着的几何变化。在此基础上，提出了降低层高、提高喷嘴温度以及补偿材料挤出速率等措施对提高几何精度的影响。单轴拉伸和III型撕裂试验结果表明，粘结区几何形状与粘结强度之间存在线性关系。此外，根据所得打印部件的3D几何形状，我们可以使用有限元方法估计挤出物堆叠方向上的杨氏模量，这与测量值具有良好的一致性。我们设想，我们的研究结果可以有助于提供印刷参数的选择，以提高或定制印刷质量的指导方针。我们的实验数据也可以作为未来多物理场模拟模型的基准数据。
Fused filament fabrication (FFF) is one of the most popular additive manufacturing processes. However, structural applications of FFF are still limited by unwanted variations in mechanical strength and structural dimensions of printed parts. To obtain a fundamental understanding of these issues, we focused on the interlayer bonding region of bisphenol-A-polycarbonate samples. The samples were prepared by a low-cost open-source FFF 3D printer, and full three-dimensional (3D) geometrical characterizations were performed on them using X-ray micro computed tomography (micro-CT). The results showed significant geometry variation depending on different printing conditions, including print speed, layer height, and nozzle temperature. Based on the results, we demonstrated the effects of reducing layer height and increasing nozzle temperature as well as compensating material extrusion rate to improve geometric precision. Moreover, uniaxial tensile and Mode III tear tests results showed that there are linear relations between bonding zone geometry and bonding strength. In addition, from the 3D geometry of the resulting printed part, we could estimate the Young's modulus in the extrudate stacking direction using finite element method, which showed good agreement with the measured value. We envision that our findings can contribute to providing guidelines for the selection of printing parameters to improve or customize printing quality. Our experimental data may also serve as benchmark data for future multi-physics simulation models.