Numerical study of texture in material extrusion: Orientation in a multicomponent system of spheres and ellipsoids
Numerical study of texture in material extrusion: Orientation in a multicomponent system of spheres and ellipsoids
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DOI：
10.1016/j.jnnfm.2021.104532
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发表时间：
2021-03-26
影响因子：
3.1
通讯作者：
Bierwisch, Claas
中科院分区：
文献类型：
--
作者：
Dietemann, Bastien;Bosna, Fatih;Bierwisch, Claas
基于挤出的增材制造技术，如Robocasting，生产连续长丝以创建分层结构。这些结构的材料特性取决于细丝内悬浮颗粒的取向。这种取向可以通过分析模型来预测，但这些模型并不存在于本工作中特别考虑的糊剂：一种多组分糊剂，由两种类型的颗粒组成，分别具有球形和椭球形。为了提高这样的悬浮液内的纹理演变的理解，我们使用实验验证的粒子级模拟来解决以下三个问题：第一，如何强大的球体影响各种变形下的剪切和/或伸长的椭球体的对齐？第二，在何种程度上，分析取向预测模型与数值模拟相匹配，尽管该模型忽略了球体的存在？第三，在这样一个多组分系统中，有什么方法可以改善椭球体的排列？
Extrusion-based Additive Manufacturing techniques, such as Robocasting, produce continuous filaments to create layer-wise structures. The material properties of these structures depend on the orientation of suspended particles within the filament. This orientation can be predicted by analytical models, but those models do not exist for the paste specifically regarded in this work: A multicomponent paste that consists of two types of particles having either spherical and ellipsoidal shape, respectively. To improve understanding of the texture evolution within such a suspension, we use experimentally validated particle-level simulations to address the following three questions: First, how strong do the spheres affect the alignment of ellipsoids under various deformations in terms of shear and/or elongation? Second, to which extend does an analytical orientation prediction model match the numerical simulations although the model ignores the presence of spheres? Third, which means exist to improve alignment of the ellipsoids in such a multicomponent system?