Investigating the behavior of laser-sintered Nylon 12 parts subject to dynamic loading

Amel, Hoda; Moztarzadeh, Hadi; Rongong, J.A.; Hopkinson, Neil

doi:10.1557/jmr.2014.150

Cited by 15 publications

(12 citation statements)

References 14 publications

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“…In order to examine the statistical significance of the differences observed between the three groups of section-thicknesses, non-parametric Kruskal-Wallis test was In a previous study by the authors [7], it was shown that applying the same test conditions on specimens with the same section-thickness that were built with the same machine parameters can result in very different values for fatigue life, which shows the variable nature of this material under tension-tension cyclic loading.…”

Section: Tension-tension Excitationmentioning

confidence: 99%

“…Van Hooreweder et al [6] subjected Nylon 12 laser sintered specimens to stress-controlled tension-compression fatigue loading with zero mean stress to investigate their thermal and microstructural response. Amel et al [7] investigated fatigue behaviour of LS Nylon 12 parts subject to displacementcontrolled tension only fatigue loading. In a recent study, Van Hooreweder et al [8] have explored the difference in fatigue behaviour of LS and injection moulded Nylon Several factors, both internal and external, have been identified as parameters that could influence cyclic performance and fatigue life of polymers [9]- [11].…”

Section: Introductionmentioning

confidence: 99%

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Effect of section thickness on fatigue performance of laser sintered nylon 12

et al. 2016

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Laser Sintering offers manufacturers freedom of design, which enables creating parts with complex geometries. However, very little investigation has been made into the effects of geometry on mechanical properties of the parts. In the present study, Laser Sintered Nylon 12 parts with different section-thickness are subjected to displacement-controlled tension-tension and force-controlled fully-reversed fatigue loading to investigate the effect of geometry on their fatigue behaviour. Sectionthickness of the parts is shown to have no significant influence on the fatigue behaviour under tension-only loading. However, fatigue life of parts under fullyreversed loading is shown to increase with section thickness.

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Section: Tension-tension Excitationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of section thickness on fatigue performance of laser sintered nylon 12

et al. 2016

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“…This was deemed to be a result of the variable nature of the quality of the specimens, with the observation being made that a normal distribution of cycles to failure should be expected. The large variation in results was also observed in an earlier study by the same authors (Amel, et al, 2014).…”

Section: Nylon 12 Fatiguesupporting

confidence: 82%

“…There is no clear reason as to why this particular sample failed so early, as all samples underwent an identical conditioning procedure as well as a visual inspection for any obvious flaws. However, it should be noted that the results for a single test scenario should follow a normal distribution, as suggested by Amel et al (2014). For such a small sample size (three)…”

Section: − Analysismentioning

confidence: 94%

UQ eSpace

Fitzpatrick¹

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A local podiatry company has recently purchased a state-of-the-art 3D printer for manufacturing orthotic insoles. The HP Jet Fusion will replace the existing manufacturing techniques which are time consuming and labour intensive. However, due to the innovative printing process, the long-term durability of the material produced by the device is currently unknown. Fatigue is a significant concern in the design of orthotics due to the constant cyclic loading experienced during walking or running. As such, this thesis set out to determine the suitability of the Jet Fusion printer for producing orthotics from a fatigue perspective. Following an extensive literature review, flexural fatigue testing was conducted using the ASTM D7774 standard. The tests compared the Jet Fusion samples to the performance of specimens produced through fused deposition modelling (FDM). The results indicated that the Jet Fusion and FDM samples had fatigue limits of 22.4 MPa and 7.7 MPa respectively. The number of cycles to failure and flexural stress levels were found to be logarithmically correlated for both materials. With the maximum stress experienced by orthotic insoles being in the order of 1 MPa, it was found that both materials had sufficient properties to avoid failure due to fatigue. As such, it has been concluded that from a fatigue perspective, the HP Jet Fusion Printer is suitable for use in manufacturing orthotic insoles. ii ACKNOWLEDGEMENTS I would firstly like to thank my supervisor Dr Gui Wang for taking me on at such short notice. His expertise and guidance throughout this project have been of tremendous help and I am sincerely thankful for his assistance. I would also like to acknowledge: Daniel Graham for his assistance with setting up the testing machines; the UQ Workshop for producing the mounting rig; and iOrthotics for the inspiration for the topic and provision of testing samples. Finally, my heartfelt thanks go to my wonderful family and friends for their endless support and encouragement.

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“…The materials chosen are metal alloys (steel [10], aluminum [11], and copper alloys, etc.) as well as polymers (ABS (Acrylonitrile butadiene styrene) [12], PLA (polylactide) [13], polyamides [14,15], etc.). In a number of works, the influence on the mechanical properties of various parameters of the printing process (speed, temperature, layer thickness [16][17][18], etc.)…”

Section: Introductionmentioning

confidence: 99%

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

2019

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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.

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Investigating the behavior of laser-sintered Nylon 12 parts subject to dynamic loading

Abstract: Abstract

Cited by 15 publications

References 14 publications

Effect of section thickness on fatigue performance of laser sintered nylon 12

Effect of section thickness on fatigue performance of laser sintered nylon 12

UQ eSpace

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

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