Experimental, numerical and analytical investigation of the polyamide 12 powder bed fusion with the aim of building dimensionless characteristic numbers

Grünewald, Moritz; Popp, Kevin; Rudloff, Johannes; Lang, Marieluise; Sommereyns, Alexander; Schmidt, Michael; Mohseni-Mofidi, Shoya; Bierwisch, Claas

doi:10.1016/j.matdes.2021.109470

Cited by 17 publications

(6 citation statements)

References 26 publications

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“…Some studies reported that energy density depends on the laser power P (W), scan spacing H (mm) and laser beam speed V (mm s −1 ) according to eqn (1). 58–60 Therefore, the laser energy density was 0.125 J mm −2 in the present work.ED = P /( H × V )…”

Section: Methodsmentioning

confidence: 67%

Construction of a stereocomplex between poly(d-lactide) grafted hydroxyapatite and poly(l-lactide): toward a bioactive composite scaffold with enhanced interfacial bonding

Shuai

Feng

et al. 2022

J. Mater. Chem. B

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Section: Methodsmentioning

confidence: 67%

Construction of a stereocomplex between poly(d-lactide) grafted hydroxyapatite and poly(l-lactide): toward a bioactive composite scaffold with enhanced interfacial bonding

Shuai

Feng

et al. 2022

J. Mater. Chem. B

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“…The influence of process parameters including the scanning hatch distance, layer thickness, and especially energy density, has been addressed in the literature. These parameters can change crystallisation and residual porosity, which eventually affects the thermal conductivity [5,[10][11][12]. It has also been well studied that, porosity is unquestionably the key factor influencing the mechanical behaviour of AM polymer parts [7], since a variety of mechanical responses can be explained by different porosity levels, as well as the shape, diameter, volume and relative distributions of the pores and voids [16,68].…”

Section: Fracture Morphologymentioning

confidence: 99%

“…The common materials used in AM are engineering thermoplastics such as polyamides (PA), polyimides (PI), polyetherimides (PEI), and polycarbonates (PC). Currently, polyamide-12 (PA12) is the most widely used powder material that accounts for over 90% of polymeric PBF workpieces owing to the combination of easy processability, low cost, lightweight, and impact resistance [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…A broad set of standard mechanical characterisation tests such as tension, compression, flexural, shear and fracture are conducted on L-PBF samples [8,9]. Studies also include the effects of different processing conditions [5,[10][11][12] and blends of virgin and reused powders [13] on the mechanical properties. However, the majority of the existing literature of the mechanical properties of PA12-based PBF components/ samples has focused only on quasi-static compressive and tensile properties [4,[14][15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Build Orientation and Strain Rate on the Tensile-Shear Behaviour of Polyamide-12 Manufactured Via Laser Powder Bed Fusion

Quino

Ramakrishnan

et al. 2023

Preprint

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“…Subsequently, the final shrinkage of the thickness (∆L/L 0 ) can be analytically estimated with the Mackenzie-Shuttleworth sintering model based on surface tension [38,39], it is:…”

Section: Lengthmentioning

confidence: 99%

Multi-scale sintering model of visco-elastic powders

Alvarez

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This thesis aims to investigate the sintering process of visco-elastic particles through a multi-scale framework and multi-physics approach. The research examines the sintering process at various scales, ranging from particle-particle interactions at the microscopic scale to continuum deformations at the macroscopic scale. By combining computer simulations and laboratory tests, the investigations gain valuable insights into the micro-macro responses of the sintering process.The thesis is organized into four distinct yet interconnected chapters that span the entire spectrum of the sintering process. These chapters focus on the following aspects:• In Chapter 2, we characterise contact rheology. The focus is on understanding the mechanical interactions between particles during the sintering process.• In Chapter 3, we explore the multi-physics of sintering. It delves into the physical phenomena that occur during sintering considering heat transfer and material flow.• In Chapter 4, we analyse the influence of material and process parameters on sintering. The study investigates how different material properties and process conditions affect the overall sintering process and its outcomes.• In Chapter 5, we couple the discrete model to the continuum model for a multi-scale framework. It bridges the gap between the micro-and macro-scales by developing a comprehensive multi-scale model that incorporates both particle-level interactions and macroscopic deformations.The findings of this research offer an understanding of the sintering process in Additive Manufacturing by integrating microscopic and macroscopic perspectives. Furthermore, this study highlights the potential to continue developing and optimizing the sintering processes using advanced multi-scale modelling techniques via virtual prototyping.vii De bevindingen van dit onderzoek bieden inzicht in het sinterproces in additieve productie door microscopische en macroscopische perspectieven te integreren. Bovendien benadrukt deze studie het potentieel om sinterprocessen verder te ontwikkelen en te optimaliseren met behulp van geavanceerde multi-schaal modelleringstechnieken via virtuele prototypen. viii

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Experimental, numerical and analytical investigation of the polyamide 12 powder bed fusion with the aim of building dimensionless characteristic numbers

Cited by 17 publications

References 26 publications

Construction of a stereocomplex between poly(d-lactide) grafted hydroxyapatite and poly(l-lactide): toward a bioactive composite scaffold with enhanced interfacial bonding

Construction of a stereocomplex between poly(d-lactide) grafted hydroxyapatite and poly(l-lactide): toward a bioactive composite scaffold with enhanced interfacial bonding

Effects of Build Orientation and Strain Rate on the Tensile-Shear Behaviour of Polyamide-12 Manufactured Via Laser Powder Bed Fusion

Multi-scale sintering model of visco-elastic powders

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