Mechanical Properties of Polypropylene: Additive Manufacturing by Multi Jet Fusion Technology

Šafka, Jiří; Ackermann, Michal; Véle, Filip; Macháček, Jakub; Henyš, Petr

doi:10.3390/ma14092165

Cited by 14 publications

(5 citation statements)

References 26 publications

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“…Pandelidi et al [ 23 ] studied the effect of powder refresh ratios on the thermal and mechanical properties of MJF-printed PA11 parts. Šafka et al [ 24 ] conducted a comprehensive characterization on the mechanical properties of MJF-printed polypropylene printed along seven major print orientations. To the authors’ knowledge, there are no publications on MJF-printed TPU parts to date.…”

Section: Introductionmentioning

confidence: 99%

A Comprehensive Investigation on 3D Printing of Polyamide 11 and Thermoplastic Polyurethane via Multi Jet Fusion

2021

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Multi Jet Fusion (MJF) is a recently developed polymeric powder bed fusion (PBF) additive manufacturing technique that has received considerable attention in the industrial and scientific community due to its ability to fabricate functional and complex polymeric parts efficiently. In this work, a systematic characterization of the physicochemical properties of MJF-certified polyamide 11 (PA11) and thermoplastic polyurethane (TPU) powder was conducted. The mechanical performance and print quality of the specimens printed using both powders were then evaluated. Both PA11 and TPU powders showed irregular morphology with sharp features and had broad particle size distribution, but such features did not impair their printability significantly. According to the DSC scans, the PA11 specimen exhibited two endothermic peaks, while the TPU specimen exhibited a broad endothermic peak (116–150 °C). The PA11 specimens possessed the highest tensile strength in the Z orientation, as opposed to the TPU specimens which possessed the lowest tensile strength along the same orientation. The flexural properties of the PA11 and TPU specimens displayed a similar anisotropy where the flexural strength was highest in the Z orientation and lowest in the X orientation. The porosity values of both the PA11 and the TPU specimens were observed to be the lowest in the Z orientation and highest in the X orientation, which was the opposite of the trend observed for the flexural strength of the specimens. The PA11 specimen possessed a low coefficient of friction (COF) of 0.13 and wear rate of 8.68 × 10−5 mm3/Nm as compared to the TPU specimen, which had a COF of 0.55 and wear rate of 0.012 mm3/Nm. The PA11 specimens generally had lower roughness values on their surfaces (Ra < 25 μm), while the TPU specimens had much rougher surfaces (Ra > 40 μm). This investigation aims to uncover and explain phenomena that are unique to the MJF process of PA11 and TPU while also serving as a benchmark against similar polymeric parts printed using other PBF processes.

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Section: Introductionmentioning

confidence: 99%

A Comprehensive Investigation on 3D Printing of Polyamide 11 and Thermoplastic Polyurethane via Multi Jet Fusion

2021

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“…The most commonly used techniques for manufacturing PA products are FFF/FDM (Fused Filament Fabrication/Fused Deposition Modeling) techniques which are commercial types of MEX [ 26 ]. Taking into account the nature and operating conditions of devices that produce parts using MEX techniques, the production process is straightforward and cost-effective [ 27 ]. In FDM/FFF, polyamide filaments are heated to melting temperature and then precisely deposited layer by layer, allowing for the creation of geometrically complex parts with high surface quality.…”

Section: Introductionmentioning

confidence: 99%

Bending Strength of Continuous Fiber-Reinforced (CFR) Polyamide-Based Composite Additively Manufactured through Material Extrusion

Łakomy,

Kluczyński,

Sarzyński

et al. 2024

Materials

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This paper shows the three-point bending strength analysis of a composite material consisting of polyamide doped with chopped carbon fiber and reinforced with continuous carbon fiber produced by means of the material extrusion (MEX) additive manufacturing technique. For a comparison, two types of specimens were produced: unreinforced and continuous fiber-reinforced (CFR) with the use of carbon fiber. The specimens were fabricated in two orientations that assure the highest strength properties. Strength analysis was supplemented by additional digital image correlation (DIC) analysis that allowed for the identification of regions with maximum strain within the specimens. The utilization of an optical microscope enabled a fractographic examination of the fracture surfaces of the specimens. The results of this study demonstrated a beneficial effect of continuous carbon fiber reinforcement on both the stiffness and strength of the material, with an increase in flexural strength from 77.34 MPa for the unreinforced composite to 147.03 MPa for the composite reinforced with continuous carbon fiber.

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“…In turn, complex geometries that are significantly challenging or physically impossible to build using other AM methods can be realized using PBF. [10][11][12] The printing volume of leading MJF printers also allows for large parts or even multi-part assemblies with moving components to be manufactured directly without fasteners or other off-the-shelf parts. Additionally, the MJF printing process does not require chemical post-processing (e.g., solvent baths) to achieve desired mechanical properties or to remove unwanted material.…”

Section: Introductionmentioning

confidence: 99%

Multi Jet Fusion printed lattice materials: characterization and prediction of mechanical performance

Chen

Fitzhugh

et al. 2023

Mater. Adv.

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Mechanical Properties of Polypropylene: Additive Manufacturing by Multi Jet Fusion Technology

Cited by 14 publications

References 26 publications

A Comprehensive Investigation on 3D Printing of Polyamide 11 and Thermoplastic Polyurethane via Multi Jet Fusion

A Comprehensive Investigation on 3D Printing of Polyamide 11 and Thermoplastic Polyurethane via Multi Jet Fusion

Bending Strength of Continuous Fiber-Reinforced (CFR) Polyamide-Based Composite Additively Manufactured through Material Extrusion

Multi Jet Fusion printed lattice materials: characterization and prediction of mechanical performance

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