Tensile and Fatigue Analysis of 3D-Printed Polyethylene Terephthalate Glycol
Tensile and Fatigue Analysis of 3D-Printed Polyethylene Terephthalate Glycol
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DOI：
10.1007/s11668-019-00631-z
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发表时间：
2019-04-01
影响因子：
1.2
通讯作者：
Jung, Sungmoon
中科院分区：
文献类型：
--
作者：
Dolzyk, Grzegorz;Jung, Sungmoon
本文研究了通过熔丝制造 (FFF) 制造的聚对苯二甲酸乙二醇酯 (PETG) 零件的拉伸和疲劳行为。 PETG 是一种热塑性聚酯，可用作商用桌面 3D 打印机的长丝。随着最终部件使用的 3D 打印组件功能的不断增长，表征可用材料在准静态和动态负载条件下的机械性能至关重要。 FFF 组件的主要问题之一是由零件构建方向和光栅方向引起的机械性能的各向异性。本研究的目的是通过测试四种光栅方向（纵向、横向、对角线和交叉阴影线）来量化 PETG 试样的各向异性。对两种样品类型进行了准静态拉伸试验，这两种样品产生了纵向样品的最高极限拉伸强度和弹性模量。对于最弱和最强的方向，测得的强度从 41.58 到 48.04 MPa，相当于注塑加工的 PETG 强度的 83-96%。在每种样本类型的标称 UTS 的 90%、80%、70% 和 60% 下进行应力比 R = 0.1 的拉伸-拉伸疲劳试验。 S-N 曲线显示，纵向样本的疲劳寿命最高，其次是 80-90% UTS 应力水平下的交叉影线样本，最终均被 60% UTS 应力水平下的对角线样本所超越。最后，对疲劳样本进行的断口分析显示所有方向都有塑性破坏的迹象。本文提供了文献中未曾发现的PETG拉伸和疲劳性能的实验分析。结果表明，PETG 因其具有竞争力的机械性能和较小的各向异性而成为 FFF 技术的良好候选者。
This paper investigates the tensile and fatigue behavior of polyethylene terephthalate glycol (PETG) parts manufactured by fused filament fabrication (FFF). PETG is a thermoplastic polyester that is available as a filament for commercial desktop 3D printers. As the functionality of 3D printing components for end-part use grows, it is essential to characterize mechanical properties of available materials in a quasistatic and dynamic loading condition. One of the main issues of FFF components is the anisotropy of mechanical properties that is induced by part-build orientation and raster orientation. The objective of this study was to quantify anisotropy of PETG coupons by testing against four raster orientations-longitudinal, transversal, diagonal and crosshatched. Quasistatic tensile tests were performed on two specimen types that yielded the highest ultimate tensile strength and modulus of elasticity for longitudinal specimens. Measured strength varied from 41.58 to 48.04 MPa for the weakest and strongest orientations which correspond to 83-96% of PETG strength processed by injection molding. Tensile-tensile fatigue tests with a stress ratio of R = 0.1 were performed at 90, 80, 70 and 60% of nominal UTS of each specimen type. S-N curves displayed the highest fatigue life of the longitudinal specimen followed by the crosshatched specimen at 80-90% UTS stress level that were both eventually outperformed by the diagonal specimen at the 60% UTS stress level. Finally, a fractography analysis conducted on fatigued specimens displayed signs of plastic failure for all orientations. This paper provides an experimental analysis of PETG tensile and fatigue properties that have not been found in the literature. Results show that PETG is a good candidate for FFF technology because of the competitive mechanical properties and lesser anisotropy.