Effects of the Infill Density on the Mechanical Properties of Nylon Specimens Made by Filament Fused Fabrication

Abstract

Additive manufacturing of polymer products over the past decade has become widespread in various areas of industry. Using the fused filament fabrication (FFF) method, one of the most technologically simple methods of additive manufacturing, it is possible to produce parts from a large number of different materials, including wear-resistant nylon. The novelty of the work is properties investigation of ±45° filling configuration with different filling degree for nylon, as well as calculating the effect of infill on the strength characteristics, excluding the shell. This article reflects the process of manufacturing samples from nylon using FFF technology with various internal topologies, as well as tensile tests. The analysis of the obtained results is performed and the relationship between the structure of the sample and the limit of its strength is established. To calculate real filling degree and the effect of internal filling on the strength characteristics of the specimen, it is proposed to use a method based on the geometric and mass parameters. The FFF method is promising for developing methods for producing a composite material. The results of this article can be useful in choosing the necessary manufacturing parameters.

Drivers of mechanical performance variance in 3D‐printed fused filament fabrication parts: An Onyx FR case study

“…These simplistic samples provide relative insights into the properties of printed parts; however, we acknowledge that specific parts will have much more complex interactions, which have been discussed more extensively in other studies. [20][21][22] For instance, Terekhina et al show that infill parameters can greatly affect part properties. Specifically, they tested five different infills in 3D-printed nylon with dogbones printed at 20% infill having an average infill tensile strength of 0.83 versus 32.7 MPa printed at 100% infill.…”

Use of Biomaterials for 3D Printing by Fused Deposition Modeling Technique: A Review

“…Most commonly used thermoplastic materials are polylactic acid (PLA) (Valerga et al, 2018;Liu Z. et al, 2019), poly(ε-caprolactone) (PCL) (Chim et al, 2006;Goyanes et al, 2016;Tran et al, 2017), ethylene vinyl acetate (EVA) (Kumar et al, 2018), polyamides (Terekhina et al, 2019), and acrylonitrile butadiene styrene (ABS) (McLouth et al, 2017;Harris et al, 2019). Chaunier et al (2018) mentioned that the polymers that have a processing temperature higher than the transition temperature and lower than the degradation temperature with a rigidity of ≥1 GPa can be used for FDM application.…”

The effect of build orientation on both flexural quasi-static and fatigue behaviours of filament deposited PA6 polymer

“…Usually, operators choose the parameters under their experience and acquired knowledge, but there is not enough comprehensive information to determine suitable manufacturing parameters. Although the quasi-static mechanical properties and dimensional accuracy of FFF components are well documented [9] , [10] , [11] , [12] , [13] , the dynamic mechanical and fatigue properties are still not fully established. Fatigue testing in 3D printed specimens is challenging due to the anisotropic properties and residual stresses that result from layer deposition [14] .…”