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Study of springback of green bodies using micromechanical experiments and the discrete element method
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).ORCID iD: 0000-0001-7674-8582
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).ORCID iD: 0000-0001-6232-8819
2013 (English)In: Particle-Based Methods III: Fundamentals and Applications - Proceedings of the 3rd International Conference on Particle-based Methods Fundamentals and Applications, Particles 2013, 2013, 590-601 p.Conference paper (Refereed)
Abstract [en]

The Discrete Element Method (DEM) is today a commonly used tool to simulate compaction of particulate media. The main issue when using DEM in compaction problems is the description of the contact between two powder particles. If the material properties are known, analytical and semi-analytical methods can be used [1, 2] but for many industrial applications, for instance spray dried granules, the mechanical behaviour is unknown. The compaction behaviour and green properties of a cemented carbide powder is studied in this work and the issue of the contact description is solved by performing experiments on the powder granules. Firstly, compression tests are made on the single granules giving information of the mechanical properties at low strains. To get information at high strains, which are needed in powder compaction simulations, nanoindentation tests are performed. The measured material parameters are used in a FE model of two spheres in contact and the resulting contact law is exported to a DEM program. The DEM program is used to investigate the compaction properties of a powder compact and especially the springback during unloading which is important for predicting the final shape of the product. The results are compared with presently performed experiments and the applicability range of the discrete element simulations will be discussed.

Place, publisher, year, edition, pages
2013. 590-601 p.
Keyword [en]
DEM, Granule strength measurements, Nanoindentation, Powder compaction, Spray dried granules
National Category
Other Engineering and Technologies
URN: urn:nbn:se:kth:diva-151047ISI: 000345269500055ScopusID: 2-s2.0-84891276878ISBN: 978-849415318-1OAI: diva2:747072
3rd International Conference on Particle-Based Methods Fundamentals and Applications, Particles 2013, 18 September 2013 through 20 September 2013, Stuttgart, Germany

QC 20140915

Available from: 2014-09-15 Created: 2014-09-15 Last updated: 2015-01-15Bibliographically approved

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