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Micromechanics of Powder Compaction and Particle Contact
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).ORCID iD: 0000-0001-7674-8582
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. , viii, 8 p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 0534
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-117608ISBN: 978-91-7501-643-4 OAI: oai:DiVA.org:kth-117608DiVA: diva2:602250
Presentation
2013-02-22, Hållfasthetsläras seminarierum, Teknikringen 8, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20130201

Available from: 2013-02-01 Created: 2013-01-31 Last updated: 2013-02-01Bibliographically approved
List of papers
1. On the effect of particle size distribution in cold powder compaction
Open this publication in new window or tab >>On the effect of particle size distribution in cold powder compaction
2012 (English)In: Journal of applied mechanics, ISSN 0021-8936, E-ISSN 1528-9036, Vol. 79, no 5, 051017- p.Article in journal (Refereed) Published
Abstract [en]

The effect of particle size distribution in powder compaction has been studied using the discrete element method. Both isostatic compaction and closed die compaction are studied together during the entire loading process. Particle rotation and frictional effects are accounted for in the analysis. The particles are, constitutively described by rigid plasticity, assumed to be spherical with the size of the radii that follows a truncated normal distribution. The results show that size distribution effects are small on global compaction properties like compaction pressure if the size distribution is small. Furthermore, the size distribution had no influence at all on the macroscopic behavior at unloading. To verify the model, comparisons were made on two different sets of experiment found in the literature where the particles were of varying sizes. Good agreement was found both on fundamental properties like the average number of contacts per particle and on more important properties from a practical point of view, like the compaction pressure.

Keyword
Discrete element method, Particle size distribution, Powder compaction
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-83869 (URN)10.1115/1.4006382 (DOI)000308413800017 ()2-s2.0-84865126805 (Scopus ID)
Funder
Vinnova
Note

QC 20120913

Available from: 2012-02-13 Created: 2012-02-13 Last updated: 2017-12-07Bibliographically approved
2. On force-displacement relations at contact between elastic-plastic adhesive bodies
Open this publication in new window or tab >>On force-displacement relations at contact between elastic-plastic adhesive bodies
2013 (English)In: Journal of the mechanics and physics of solids, ISSN 0022-5096, E-ISSN 1873-4782, Vol. 61, no 5, 1185-1201 p.Article in journal (Refereed) Published
Abstract [en]

The loading-unloading of dissimilar adhesive elastic-plastic bodies is studied both analytically and numerically, including elastic-ideal plastic and deformation hardening behavior. The contacting bodies are assumed to be spherical in the region of contact and consequently the presented model is partly based on results pertinent to Brinell indentation. The problem of adhesive unloading is solved in two steps; first the unloading in the absence of adhesion is studied and then an adhesive pressure term is added. The analytical model is derived using fracture mechanics arguments and is based on one parameter, the fracture energy. The model is finally verified with finite element simulations by introducing a cohesive behavior between the modeled spheres. The analytical model shows very good agreement with the FE-simulations both during loading and unloading and also concerning the case of force and displacement at separation.

Keyword
Powder compaction, Contact mechanics, Elastic-plastic material, Finite elements, Cohesive surfaces
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-117602 (URN)10.1016/j.jmps.2013.01.004 (DOI)000317163300002 ()2-s2.0-84875220365 (Scopus ID)
Funder
Vinnova
Note

QC 20130520

Available from: 2013-01-31 Created: 2013-01-31 Last updated: 2017-12-06Bibliographically approved
3. A Numerical Analysis of Cold Powder Compaction Based on Micromechanical Experiments
Open this publication in new window or tab >>A Numerical Analysis of Cold Powder Compaction Based on Micromechanical Experiments
2013 (English)Report (Other academic)
Publisher
18 p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid Mechanics, ISSN 1654-1472 ; 533
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-117605 (URN)
Note

QC 20130201

Available from: 2013-01-31 Created: 2013-01-31 Last updated: 2013-02-01Bibliographically approved

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