Effect of Nozzle Diameter on Tensile and Fracture Behavior of FDM-PLA Samples

Procedia Structural Integrity Pub Date : 2024-01-01 DOI:10.1016/j.prostr.2024.06.004

Shadi Salamatian Hosseini , Amir Nabavi-Kivi , Majid R Ayatollahi , Michal Petru

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Abstract

Fused Deposition Modeling (FDM) technique is a subcategory of additive manufacturing processes that works by extruding a fine polymeric filament on the heated bed. The current research paper surveys the influence of nozzle diameter as a manufacturing parameter on the mechanical properties and mode I fracture behavior of the FDM-PLA samples. Four different nozzle diameters of 0.4, 0.6, 0.8, and 1 mm with two raster configurations of 0/90° and 45/-45° were considered for printing the dog-bone and Semi-Circular Bending (SCB) samples. Also, to evaluate the fracture resistance of FDM-PLA pre-cracked samples, the critical value of J-integral (Jc) was used and calculated through a finite element analysis. The obtained results indicated that the raster angle of 45/-45° resulted in higher mechanical properties compared to 0/90° one, also, the 1 mm nozzle diameter presented a better performance from a mechanical property point of view. The SCB sample printed through the 1 mm nozzle diameter and 45/-45° raster orientation had the highest value of Jc (10400 J/m²). Besides, the crack extension paths were monitored and discussed comprehensively.

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喷嘴直径对 FDM-PLA 样品拉伸和断裂行为的影响

熔融沉积建模（FDM）技术是增材制造工艺的一个子类，其工作原理是在加热的床面上挤出细小的聚合物丝。本研究论文探讨了作为制造参数的喷嘴直径对 FDM-PLA 样品的机械性能和模式 I 断裂行为的影响。考虑了 0.4、0.6、0.8 和 1 毫米四种不同的喷嘴直径，以及 0/90° 和 45/-45° 两种光栅配置，用于打印狗骨和半圆弯曲 (SCB) 样品。此外，为了评估 FDM-PLA 预裂纹样品的抗断裂性，使用了 J 积分（Jc）临界值，并通过有限元分析进行了计算。结果表明，与 0/90° 的光栅角相比，45/-45° 的光栅角具有更高的机械性能，而且从机械性能的角度来看，喷嘴直径为 1 毫米的光栅角具有更好的性能。采用 1 毫米喷嘴直径和 45/-45° 光栅方向印刷的 SCB 样品具有最高的 Jc 值（10400 J/m2）。此外，还对裂纹扩展路径进行了全面监测和讨论。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Procedia Structural Integrity

CiteScore

1.70

自引率

0.00%

发文量