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Modelling and simulation of tensile fracture in high velocity compacted metal powder
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.ORCID iD: 0000-0002-7514-0513
2007 (English)In: Materials Processing and Design: Modeling, Simulation and Applications; NUMIFORM 2007: Proceedings of the 9th International Conference on Numerical Methods in Industrial Forming Processes / [ed] Jose M.A.Cesar de Sa; Abel D. Santos, Melville, NY: American Institute of Physics (AIP), 2007, p. 1117-1122Conference paper, Published paper (Refereed)
Abstract [en]

In cold uniaxial powder compaction, powder is formed into a desired shape with rigid tools and a die. After pressing, but before sintering, the compacted powder is called green body. A critical property in the metal powder pressing process is the mechanical properties of the green body. Beyond a green body free from defects, desired properties are high strength and uniform density. High velocity compaction (HVC) using a hydraulic operated hammer is a production method to form powder utilizing a shock wave. Pre-alloyed water atomised iron powder has been HVC-formed into circular discs with high densities. The diametral compression test also called the Brazilian disc test is an established method to measure tensile strength in low strength material like e.g. rock, concrete, polymers and ceramics. During the test a thin disc is compressed across the diameter to failure. The compression induces a tensile stress perpendicular to the compressed diameter. In this study the test have been used to study crack initiation and the tensile fracture process of HVC-formed metal powder discs with a relative density of 99%. A fictitious crack model controlled by a stress versus crack-width relationship is utilized to model green body cracking. Tensile strength is used as a failure condition and limits the stress in the fracture interface. The softening rate of the model is obtained from the corresponding rate of the dissipated energy. The deformation of the powder material is modelled with an elastic-plastic Cap model. The characteristics of the tensile fracture development of the central crack in a diametrically loaded specimen is numerically studied with a three dimensional finite element simulation. Results from the finite element simulation of the diametral compression test shows that it is possible to simulate fracturing of HVC-formed powder. Results from the simulation agree reasonably with experiments.

Place, publisher, year, edition, pages
Melville, NY: American Institute of Physics (AIP), 2007. p. 1117-1122
Series
A I P Conference Proceedings Series, ISSN 0094-243X ; 908
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-39967DOI: 10.1063/1.2740960ISI: 000246933500175Scopus ID: 34547496907Local ID: eeb62650-6c3a-11dc-89fb-000ea68e967bISBN: 978-0-7354-0415-1 (print)OAI: oai:DiVA.org:ltu-39967DiVA, id: diva2:1013487
Conference
International Conference on Numerical Methods in Industrial Forming Processes : 17/06/2007 - 21/06/2007
Note

Validerad; 2007; 20070926 (ysko)

Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2019-06-04Bibliographically approved

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Jonsén, PärHäggblad, Hans-åke

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