Effect of PA12 powder reuse on coalescence behaviour and microstructure of SLS parts

Dadbakhsh, Sasan; Verbelen, Leander; Verkinderen, Olivier; Strobbe, Dieter; Puyvelde, Peter Van; Kruth, Jean‐Pierre

doi:10.1016/j.eurpolymj.2017.05.014

Cited by 166 publications

(178 citation statements)

References 24 publications

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“…In this regard, an increase in building time and temperatures leads to an increase in the crystallinity of PA-12, which affects the built parts [9,[32][33][34][35]. In this respect, a high degree of crystallinity is associated with higher shrinkage of printed components and lower ductility, which affects the dimensional and geometrical accuracy, as well as surface finish of the printed parts [17].…”

Section: Physical and Mechanical Deterioration Of Polymers Due Tomentioning

confidence: 99%

A Review of Methods Used to Reduce the Effects of High Temperature Associated with Polyamide 12 and Polypropylene Laser Sintering

Mwania

Maringa

Walt

2020

Advances in Polymer Technology

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The polymer laser sintering (PLS) process is one of the most promising additive manufacturing (AM) technologies for polymeric materials. However, the technique has challenges because the physical, mechanical, and chemical properties of the polymeric powder deteriorate due to the high temperatures prevailing in the build chamber during manufacture. These high temperatures cause agglomeration of powder, which leads to a decrease in the flowability of powder. There is also a related drop in the coalescence of the powder granules during PLS, which results in porosity that undermines the mechanical integrity of printed parts. Moreover, the viscosity of the melt increases due to cross-linking of molecular chains. This, in turn, increases the tensile strength of the printed components at the expense of the percentage elongation at break. Thus, high prolonged processing temperatures decrease the reusability of polymeric materials used in PLS. In this paper, a review of the studies conducted to investigate ways of reducing the effects of high temperature on polymeric powders is presented.

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Section: Physical and Mechanical Deterioration Of Polymers Due Tomentioning

confidence: 99%

A Review of Methods Used to Reduce the Effects of High Temperature Associated with Polyamide 12 and Polypropylene Laser Sintering

Mwania

Maringa

Walt

2020

Advances in Polymer Technology

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“…It has a great strength-to-weight ratio. It can be also recycled, with the maximal ratio for safe quality three-dimensional (3D) printing being 80% new and 20% recycled material [21]. It is also an appropriate material for contact with human skin and, moreover, is self-supporting if SLS and MJF methods are used.…”

Section: Bst Materialsmentioning

confidence: 99%

New Design Procedure of Transtibial ProsthesisBed Stump Using Topological Optimization Method

et al. 2020

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This paper presents a new design procedure for production of a transtibial prosthesis bed stump by three-dimensional (3D) printing with topological optimization. The suggested procedure combines the medical perspective with finite element analysis and facilitates regaining the symmetry in patients with transtibial prosthesis, which leads to life improvement. The particular focus of the study is the weight reduction of the lower part of the bed stump, while taking into account its stiffness and load-bearing capacity. The first part of the work deals with the analysis of the subject geometry of the bed stump, which is usually oversized in terms of the weight and stiffness that are necessary for the current application. In the second part, an analysis of walking biomechanics with a focus on the impact and rebound phases is presented. Based on the obtained information, a spatial model of the lower part of the bed stump is proposed in the third phase, in which the finite element method is described. In the fourth part, the topological optimization method is used for reducing the structure weight. In the last part, the results of the designed model are analyzed. Finally, the recommendations for the settings of the method are presented. The work is based on the practical industry requirements, and the obtained results will be reflected in the design of new types of transtibial prosthesis.

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“…Variations in PBF process parameters affect energy density delivered to the powder bed, which result in microscale porosity [ 29 ] and cause variation in mechanical properties [ 30 ]. Powder quality (whether virgin powder or recycled) also affects porosity [ 31 ]. The FDA has issued further technical guidelines for medical devices fabricated with AM that supplement the aforementioned considerations [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

Additively manufactured respirators: quantifying particle transmission and identifying system-level challenges for improving filtration efficiency

Bezek

Pan

Harb

et al. 2021

Journal of Manufacturing Systems

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Effect of PA12 powder reuse on coalescence behaviour and microstructure of SLS parts

Cited by 166 publications

References 24 publications

A Review of Methods Used to Reduce the Effects of High Temperature Associated with Polyamide 12 and Polypropylene Laser Sintering

A Review of Methods Used to Reduce the Effects of High Temperature Associated with Polyamide 12 and Polypropylene Laser Sintering

New Design Procedure of Transtibial ProsthesisBed Stump Using Topological Optimization Method

Additively manufactured respirators: quantifying particle transmission and identifying system-level challenges for improving filtration efficiency

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