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Local contact compliance relations at compaction of composite powders
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).ORCID iD: 0000-0001-6232-8819
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2007 (English)In: Journal of applied mechanics, ISSN 0021-8936, E-ISSN 1528-9036, Vol. 74, no 1, 164-168 p.Article in journal (Refereed) Published
Abstract [en]

Local contact behavior of composite powders has been investigated by using the finite element method. In previous analyses of such problems it has in general been assumed that one of the powder materials is rigid while the other deforms at loading as in such a case self-similarity prevails. This is a very good approximation for ceramic/metallic composites but may not be so when the composite consists of two materials of roughly equal hardness. An approximate compliance formula for describing this feature is proposed showing good agreement with corresponding finite element results for representative cases.

Place, publisher, year, edition, pages
2007. Vol. 74, no 1, 164-168 p.
Keyword [en]
discrete element method, power-law creep, cold compaction, particle deformation, inelastic contact, plasticity theory, size ratio, indentation, solids, brinell
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-6350DOI: 10.1115/1.2165240ISI: 000243485900019Scopus ID: 2-s2.0-34248192774OAI: oai:DiVA.org:kth-6350DiVA: diva2:11038
Note
Uppdaterad från submitted till published: 20101007. QC 20101007Available from: 2005-09-14 Created: 2005-09-14 Last updated: 2010-10-07Bibliographically approved
In thesis
1. Cold compaction of composite powders
Open this publication in new window or tab >>Cold compaction of composite powders
2005 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Powder compaction is a production method commonly used in the manufacturing industry today. In order to minimize costly experiments and to optimize serial production of details several methods to analyze the powder compaction process are developed and used. One method is to use micromechanical analysis where the local description of contact between two individual particles is of great importance. In this dissertation a visco-plastic contact law has been used and further developed in order to understand the powder compaction process at packing, low relative density compaction up to high relative density compaction.

In order to relax some assumptions from previous theoretical studies simulation with the discrete element method (DEM) was performed. Up to 10.000 spherical particles were used in packing and early compaction simulation. It was found that rearrangement of particles is one of the major densification mechanisms in the early phases of compaction. At die compaction this effect of rearrangement was shown to be more pronounced than predicted from theoretical analyses. It was also found that the size ratio of particles is of importance when the number fraction of small particles in the compound is high.

The finite element method has been used for numerical analyses to investigate the local contact problem between two particles when self-similarity no longer prevail. Based on the numerical results a suggestion for an approximate compliance relation was made. With this approximate formula the local compliance behaviour between two dissimilar particles was analysed. These findings are directly applicable to simulations with the discrete element method. Finally, an investigation using the finite element method to evaluate the range of the accuracy for theoretical and approximate compliance formula has been done with compounds of different regular lattices. It was found that the range of accuracy is much dependent on the number of contacts within the lattices, specially new forming contacts during the compaction.

Place, publisher, year, edition, pages
Stockholm: KTH, 2005. vii, 15 p.
Series
Trita-HFL. Report / Royal Institute of Technology, Solid mechanics, ISSN 1654-1472 ; 0389
Keyword
micromechanical modelling, composite powders, descrete element method
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:kth:diva-417 (URN)
Public defence
2005-09-23, Sal B2, Brinellvägen 23, Stockholm, 10:00
Opponent
Supervisors
Note

QC 20101007

Available from: 2005-09-14 Created: 2005-09-14 Last updated: 2013-01-14Bibliographically approved

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Larsson, Per-Lennart

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