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Micromechanics of green body fracture
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.).
2014 (English)In: Euro PM 2014 Congress and Exhibition, Proceedings, 2014Conference paper (Refereed)Text
Abstract [en]

The typical production route of powder materials is cold compaction of the powder, to a so called green body, followed by sintering which gives the component its full strength. It is of vital importance that the green body is crack-free as defects will remain as weak zones in the final component. For this reason, the mechanical properties of the green body have presently been studied mostly experimentally but also some aspects of numerical modeling will be discussed. The materials studied are two types of spray dried cemented carbide powders which has been uniaxially compacted to different green densities. The compacts have thereafter been crushed in two different directions and a microscope study of the fracture surfaces has been performed in order to investigate the micromechanics of the fracture process. The study shows that both breaking of inter-particle contacts and fracture of the individual particles is important in order to describe the fracture processes. Finally, modeling of the fracture process using the Discrete Element Method (DEM) is discussed.

Place, publisher, year, edition, pages
2014.
Keyword [en]
Cemented carbides, DEM, Experiments, Green strength, Microscopy, Powder compaction, Carbide tools, Carbides, Compaction, Finite difference method, Fracture, Micromechanics, Microscopic examination, Sintering, Fracture process, Fracture surfaces, Individual particles, Particle contacts, Powder compactions, Production route, Powders
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-187577ScopusID: 2-s2.0-84959289847ISBN: 9781899072446OAI: oai:DiVA.org:kth-187577DiVA: diva2:936876
Conference
Euro PM 2014 International Conference and Exhibition, 21 September 2014 through 24 September 2014
Note

QC 20160614

Available from: 2016-06-14 Created: 2016-05-25 Last updated: 2016-06-14Bibliographically approved

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Olsson, ErikLarsson, Per-Lennart
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