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Appl. Sci. 2017, 7(5), 516;

Sintering of Two Viscoelastic Particles: A Computational Approach

Polymer Technology, Department of Mechanical Engineering, Eindhoven University of Technology, Eindhoven, 5600 MB, The Netherlands
Brightlands Materials Center, Geleen, 6167 RD, The Netherlands
Author to whom correspondence should be addressed.
Academic Editor: Peter Van Puyvelde
Received: 31 March 2017 / Revised: 2 May 2017 / Accepted: 10 May 2017 / Published: 16 May 2017
(This article belongs to the Special Issue Materials for 3D Printing)
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Selective laser sintering (SLS) is a high-resolution additive manufacturing fabrication technique. To fully understand the process, we developed a computational model, using the finite element method, to solve the flow problem of sintering two viscoelastic particles. The flow is assumed to be isothermal and the particles to be in a liquid state, where their rheology is described using the Giesekus and XPP constitutive models. In this work, we assess the parameters that define this problem, such as the initial geometry, the Deborah number and other dimensionless parameters present in the rheological models. In particular, the conformation tensor is considered, which is a measure for the polymeric strain and plays an important role in the crystallization kinetics of semicrystalline polymers like polyamide 12, usually used in SLS. View Full-Text
Keywords: finite element method; viscoelastic flow; coalescence; 3D printing; SLS finite element method; viscoelastic flow; coalescence; 3D printing; SLS

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Balemans, C.; Hulsen, M.A.; Anderson, P.D. Sintering of Two Viscoelastic Particles: A Computational Approach. Appl. Sci. 2017, 7, 516.

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