Department of Mechanical Engineering, University of Tabriz, Tabriz, Iran; Department of Mechanics and Aerospace Engineering, Southern University of Science and Technology, Shenzhen, China.
Department of Mechanical Engineering, University of Tabriz, Tabriz, Iran.
J Mech Behav Biomed Mater. 2023 Sep;145:106025. doi: 10.1016/j.jmbbm.2023.106025. Epub 2023 Jul 13.
The main aim of this research work is to investigate the effects of building directions and raster orientations on the creep behavior of 3D-printed plastic material and to develop rheological constitutive models to estimate the creep behavior of components. These components have been manufactured through the Fused Deposition Modeling (FDM) technique in which materials are heated and extruded through a nozzle to create 3D Polylactic acid (PLA) specimens. Since 3D-printed specimens exhibit anisotropic behavior, studying their building condition is necessary. Both building direction and raster orientation are among the fabrication conditions that play a major role in the mechanical behavior of the specimens. The tensile behavior of 3D-produced PLA specimens and their creep behavior were evaluated. To model the creep behavior of 3D printed PLA, three different types of rheological constitutive models, Zener, Burgers, and modified Burgers were used analytically and numerically. The finite element (FE) model of the 3D printed unnotched samples was developed to predict the creep behavior of notched samples. The results show that 3D FE models can predict the creep behavior of AM-notched specimens with high accuracy.
本研究工作的主要目的是研究建筑方向和栅格方向对 3D 打印塑料材料蠕变行为的影响，并开发流变本构模型来估计组件的蠕变行为。这些组件是通过熔丝制造（Fused Deposition Modeling，FDM）技术制造的，其中材料被加热并通过喷嘴挤出，以制造 3D 聚乳酸（PLA）样本。由于 3D 打印样本表现出各向异性行为，因此研究其制造条件是必要的。建筑方向和栅格方向都是在样本机械行为中起主要作用的制造条件之一。评估了 3D 生产的 PLA 样本的拉伸行为及其蠕变行为。为了对 3D 打印 PLA 的蠕变行为进行建模，从理论和数值两个方面使用了三种不同类型的流变本构模型，即泽纳、伯格和改进的伯格模型。开发了 3D 打印无缺口样本的有限元（FE）模型，以预测有缺口样本的蠕变行为。结果表明，3D-FE 模型可以高精度地预测 AM 有缺口样本的蠕变行为。
