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Dimensional considerations on the mechanical properties of 3D printed polymer parts
Polymer Testing ( IF 5.0 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.polymertesting.2020.106656
Nabila Elmrabet , Petros Siegkas

Abstract Additive manufacturing offers a useful and accessible tool for prototyping and manufacturing small volume functional parts. Polylactic acid (PLA) and thermoplastic polyurethane (TPU) are amongst the most commonly used materials. Characterising 3D printed PLA and TPU is potentially important for both designing and finite element modelling of functional parts. This work explores the mechanical properties of additively manufactured PLA/TPU specimens with consideration to design parameters including size, and infill percentage. PLA/TPU specimens are 3D-printed in selected ISO standard geometries with 20%, 60%, 100% infill percentage. Tensile and compression test results suggest that traditional ISO testing standards might be insufficient in characterising 3D printed materials for finite element modelling or application purposes. Infill percentage in combination to design size, may significantly affect the mechanical performance of 3D printed parts. Dimensional variation may cause inhomogeneity in mechanical properties between large and small cross section areas of the same part. The effect was reduced in small cross section parts where reducing the nominal infill had less effect on the resulting specimens. The results suggest that for 3D printed functional parts with significant dimensional differences between sections, the material properties are not necessarily homogeneous. This consideration may be significant for designers using 3D printing for applications, which include mechanical loading.

中文翻译:

3D 打印聚合物部件机械性能的尺寸考虑

摘要 增材制造为原型制作和制造小批量功能部件提供了一种有用且易于使用的工具。聚乳酸 (PLA) 和热塑性聚氨酯 (TPU) 是最常用的材料。表征 3D 打印的 PLA 和 TPU 对于功能部件的设计和有限元建模可能很重要。这项工作探讨了增材制造的 PLA/TPU 试样的机械性能,同时考虑了包括尺寸和填充百分比在内的设计参数。PLA/TPU 样品以选定的 ISO 标准几何形状进行 3D 打印,填充百分比分别为 20%、60%、100%。拉伸和压缩测试结果表明,传统的 ISO 测试标准可能不足以表征用于有限元建模或应用目的的 3D 打印材料。填充百分比与设计尺寸相结合,可能会显着影响 3D 打印部件的机械性能。尺寸变化可能会导致同一零件的大横截面和小横截面之间的机械性能不均匀。在小横截面零件中,减少标称填充量对所得试样的影响较小。结果表明,对于截面之间具有显着尺寸差异的 3D 打印功能部件,材料特性不一定是均质的。对于将 3D 打印用于包括机械加载在内的应用程序的设计人员而言,这一考虑可能很重要。尺寸变化可能会导致同一零件的大横截面和小横截面之间的机械性能不均匀。在小横截面零件中,减少标称填充量对所得试样的影响较小。结果表明,对于截面之间具有显着尺寸差异的 3D 打印功能部件,材料特性不一定是均质的。对于将 3D 打印用于包括机械加载在内的应用程序的设计人员而言,这一考虑可能很重要。尺寸变化可能会导致同一零件的大横截面和小横截面之间的机械性能不均匀。在小横截面零件中,减少标称填充量对所得试样的影响较小。结果表明,对于截面之间具有显着尺寸差异的 3D 打印功能部件,材料特性不一定是均质的。对于将 3D 打印用于包括机械加载在内的应用程序的设计人员而言,这一考虑可能很重要。结果表明,对于截面之间具有显着尺寸差异的 3D 打印功能部件,材料特性不一定是均质的。对于将 3D 打印用于包括机械加载在内的应用程序的设计人员而言,这一考虑可能很重要。结果表明,对于截面之间具有显着尺寸差异的 3D 打印功能部件,材料特性不一定是均质的。对于将 3D 打印用于包括机械加载在内的应用程序的设计人员而言,这一考虑可能很重要。
更新日期:2020-10-01
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