Luo Cheng, Mrinal Manjarik, Wang Xiang, Hong Ye
Department of Mechanical and Aerospace Engineering, University of Texas at Arlington, Arlington, TX 76010, USA.
Materials (Basel). 2021 Feb 11;14(4):871. doi: 10.3390/ma14040871.
In this study, we explore the deformation of a polymer extrudate upon the deposition on a build platform, to determine the bonding widths between stacked strands in fused-filament fabrication. The considered polymer melt has an extremely high viscosity, which dominates in its deformation. Mainly considering the viscous effect, we derive analytical expressions of the flat width, compressed depth, bonding width and cross-sectional profile of the filament in four special cases, which have different combinations of extrusion speed, print speed and nozzle height. We further validate the derived relations, using our experimental results on acrylonitrile butadiene styrene (ABS), as well as existing experimental and numerical results on ABS and polylactic acid (PLA). Compared with existing theoretical and numerical results, our derived analytic relations are simple, which need less calculations. They can be used to quickly predict the geometries of the deposited strands, including the bonding widths.
在本研究中，我们探究聚合物挤出物在沉积到成型平台上时的变形情况，以确定熔丝制造中堆叠股线之间的粘结宽度。所考虑的聚合物熔体具有极高的粘度，这在其变形过程中起主导作用。主要考虑粘性效应，我们推导了四种特殊情况下细丝的扁平宽度、压缩深度、粘结宽度和横截面轮廓的解析表达式，这四种情况具有不同的挤出速度、打印速度和喷嘴高度组合。我们利用关于丙烯腈 - 丁二烯 - 苯乙烯共聚物（ABS）的实验结果以及现有的关于ABS和聚乳酸（PLA）的实验和数值结果，进一步验证了推导的关系式。与现有的理论和数值结果相比，我们推导的解析关系式很简单，计算量更少。它们可用于快速预测沉积股线的几何形状，包括粘结宽度。
