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Simulation of high-velocity compaction process with relaxation assists using the discrete element method
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Structural and vibroacoustics.ORCID iD: 0000-0001-5760-3919
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
2012 (English)In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 217, 394-400 p.Article in journal (Refereed) Published
Abstract [en]

The discrete element method is used to investigate the high-velocity compaction process with additional piston supports known as relaxation assists. It is shown that by incorporating the relaxation assists in the piston-die assembly, particles can be better locked during the compaction process. The simulation results reveal that relaxation assists offer; smooth compaction during loading stage, prevention of the particle separation during unloading stage and conversion of higher kinetic energy of hammer into particle deformation. Finally, the influences of various loading elements on compaction process and effects of presence of adhesion during unloading stage are investigated. The results support the findings of experimental work.

Place, publisher, year, edition, pages
Elsevier, 2012. Vol. 217, 394-400 p.
Keyword [en]
High-velocity compaction, Relaxation assist, Discrete element method, Particle separation
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-31142DOI: 10.1016/j.powtec.2011.10.054ISI: 000301159500051Scopus ID: 2-s2.0-84855211436OAI: oai:DiVA.org:kth-31142DiVA: diva2:402824
Funder
TrenOp, Transport Research Environment with Novel Perspectives
Note

QC 20120411

Available from: 2011-03-09 Created: 2011-03-09 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Discrete element simulation of elasto-plastic shock waves in high-velocity compaction
Open this publication in new window or tab >>Discrete element simulation of elasto-plastic shock waves in high-velocity compaction
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Elasto-plastic shock waves in high-velocity compaction of spherical metal particles are the focus of this thesis which consists of four papers (A-D). The compaction process is modeled by a discrete element method while using elastic and plastic loading, elastic unloading and adhesion at contacts.

Paper A investigates the dynamic compaction of a one-dimensional chain of homogenous particles. The development of the elasto-plastic shock waves, its propagation and influence on the compaction process are examined. Simulations yield information on the contact behavior, velocity of the particle and its deformation during dynamic compaction. Effects of changing loading parameters on the compaction process are also discussed.

Paper B addresses the non-homogeneity in a chain having; particles of different sizes and materials, voids between the particles and particles with/without adhesion between them.

Simulations show transmission and reflection of elasto-plastic shock wave during compaction process. The particle deformation during incident and reflected shocks and particle velocity fluctuations due to voids between particles are simulated. The effects of adhesion on particles separation during unloading stage are also discussed.

Paper C develops a simulation model for a high-velocity compaction process with auxiliary pistons, known as relaxation assists, in a compaction assembly. The simulation results reveals that the relaxation assists offer; smooth compaction during loading stage, prevention of  the particle separation during unloading stage and conversion of  higher kinetic energy of hammer into particles deformation.  Furthermore, the influence of various loading elements on compaction process is investigates. These results support the findings of experimental work.

Paper D further extends the one-dimensional case of Paper A and B into two-dimensional assembly of particles while adding friction between particles and between particles and container walls. Three particular cases are investigated including closely packed hexagonal, loosely packed random and a non-homogenous assembly of particles of various sizes and materials. Consistent with the one-dimensional case, primary interest is the linking of particle deformation with the elasto-plastic shock wave propagation. Simulations yield information on particle deformation during shock propagation and change in overall particles compaction with the velocity of the hammer. The force exerted by particles on the container walls and rearrangement of the loosely packed particles during dynamic loading are also investigated. Finally, the effects of presence of friction and adhesion on both overall particles deformation and compaction process are simulated.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. v, 44 p.
Series
Trita-AVE, ISSN 1651-7660 ; 2011:17
Keyword
High-velocity compaction, Discrete element method, Plastic deformaiton, dynaimic loading, elasto-plastic shock wave, Friction, Adhesion
National Category
Physical Sciences
Research subject
Järnvägsgruppen - Ljud och vibrationer
Identifiers
urn:nbn:se:kth:diva-31144 (URN)978-91-7415-905-9 (ISBN)
Public defence
2011-03-29, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20110311Available from: 2011-03-11 Created: 2011-03-09 Last updated: 2011-03-11Bibliographically approved

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Kari, Leif

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