Analytical interpretation of microscale fiber deviation in designing for polymer melt electrohydrodynamic-based additive manufacturing
Analytical interpretation of microscale fiber deviation in designing for polymer melt electrohydrodynamic-based additive manufacturing
复制标题
基于聚合物熔体电流体动力学的增材制造设计中微尺度纤维偏差的分析解释
DOI：
10.1016/j.addma.2022.103035
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发表时间：
2022
影响因子：
11
通讯作者：
Chang, Robert C.
中科院分区：
文献类型：
--
作者：
Cao, Kai;Zhang, Fucheng;Wang, Bijun;Sun, Yuning;Zaeri, Ahmadreza;Zgeib, Ralf;Mansouri, Mo;Chang, Robert C.
在转化材料收集的帮助下，熔融电写是一种基于电流体动力学的增材材料加工技术，能够制造具有适合空间定义的组织模型的可定制微尺度架构的纤维3D结构材料。熔融电写过程的一个固有现象是特征时差，它导致喷嘴位置（np）和喷射接触点（cp）之间存在空间差异。此外，当 n 相对于收集器的运动方向改变时，cp 不会确定性地遵循 then p 轨迹。相反，与刀具路径相关的纤维偏差会降低打印精度，并且在卷曲纤维打印中普遍存在。为了解决这个瓶颈，提出了一种由纤维铺放预测和控制提供信息的分析结构。具体来说，通过矢量分析和微分几何，发现np和cp之间的位置和速度关系由位置和速度匹配方程控制。这些方程的表示可以详细阐述为直和稳定卷曲纤维打印的具体情况，本文对此进行了研究和验证。最后，cpa 的实时识别和平移台速度的动态控制被认为是在卷曲纤维打印中可靠实施刀具路径设计的关键步骤。
Aided by translational material collection, melt electrowriting is an additive electrohydrodynamic-based materials processing technique capable of fabricating fibrous 3D structured materials with customizable microscale architectures suitable for spatially defined tissue models. An inherent phenomenon of the melt electrowriting process is the characteristic jet lag, which results in spatial differences between the nozzle position (np) and the jet contact point (cp). Moreover,cpdoes not deterministically follow thenptrajectory when the movement ofnprelative to the collector is directionally altered. Instead, fiber deviation related to the toolpath deteriorates the printing accuracy and is ubiquitous for curly fiber printing. In order to address this bottleneck, an analytical construct informed by fiber placement prediction and control is advanced. Specifically, by way of vector analysis and differential geometry, the position and speed relationships betweennpandcpare found to be governed by position- and speed-matching equations. Representations of these equations can be elaborated into the specific cases of straight and steady curly fiber printing, which are investigated and verified herein. Finally, the real-time identification ofcpas well as dynamic control of translational stage speed are identified as critical steps towards reliable implementation of the toolpath design in curly fiber printing.