Neck growth kinetics during polymer sintering for powder-based processes

Juan Esteban Alvarez Naranjo, Hongyang Cheng, Henk Snijder, Tom Vaneker, Stefan Luding, Thomas Weinhart

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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Abstract

To prevent texture defects in powder-based processes, the sintering time needs to be adjusted such that a certain amount of coalescence is achieved. However, predicting the required sintering time is extremely challenging to assess in materials such as polymers because the kinetics exhibit both elastic and viscous characteristics when undergoing deformation. The present work introduces a computational approach to model the viscoelastic effect in the sintering of particles. The model contains three stages, three different mechanisms driven by adhesive inter-surface forces and surface tension, which describes the non-linear sintering behaviour. Experimental data from the binary coalescence of Polystyrene (PS), Polyamide (PA) 12 and PEEK 450PF particles are employed to calibrate the contact model, as implemented in MercuryDPM, an open-source software package. Using machine learning-based Bayesian calibration, good agreement is obtained between the experimental data and the numerical results. The findings will be used in future studies to predict densification rates in powder-based processes.
Original languageEnglish
Title of host publicationPowders & Grains 2021 – 9th International Conference on Micromechanics on Granular Media
DOIs
Publication statusPublished - 7 Jun 2021
Event9th International Conference on Micromechanics on Granular Media, Powders and Grains 2021 - Virtual Conference, Argentina
Duration: 5 Jul 20216 Aug 2021
Conference number: 9
https://www.powdersandgrains.org/

Publication series

NameEPJ Web of Conferences
Volume249

Conference

Conference9th International Conference on Micromechanics on Granular Media, Powders and Grains 2021
Abbreviated titlePowders and Grains 2021
Country/TerritoryArgentina
CityVirtual Conference
Period5/07/216/08/21
Internet address

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