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Modelling the non-linear elastic behaviour and fracture of metal powder compacts
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.ORCID iD: 0000-0003-0910-7990
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.ORCID iD: 0000-0002-7514-0513
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.ORCID iD: 0000-0002-3907-0802
2015 (English)In: Powder Technology, ISSN 0032-5910, E-ISSN 1873-328X, Vol. 284, p. 496-503Article in journal (Refereed) Published
Abstract [en]

In the powder metallurgy (PM) pressing process the mechanical properties of the green body are highly dependent on the material density. During the ejection stage of the pressing process the elastic behaviour is important especially for the crack formation in the powder compact. Experiments show a non-linear and also stress dependent elastic behaviour of green bodies. In this study diametral compression tests have been used to study elastic deformation during crack formation in a tensile fracture process of metal powder discs compacts. The powder material used for the experiments was a press-ready premix containing Distaloy AE, 0.5% graphite (uf-4) and 0.6% Kenolube. Tensile strength is used as a failure condition and limits the stress in the fracture interface. To control the tensile fracture, a cohesive zone model is used. The softening rate of the fracture 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 where an easy-to-use model for non-linearity in the elastic state due to stress is presented. The model is implemented in a finite element code and tested in simulation of a diametral compression testing. Results from simulations correlates well with experimental results and demonstrates the importance of including the non-linear elastic effect of the powder compacts. Results also show the necessity to accurate model the elasticity in the tooling to correct capture force-displacement response and fracturing processes.

Place, publisher, year, edition, pages
2015. Vol. 284, p. 496-503
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-10106DOI: 10.1016/j.powtec.2015.07.031ISI: 000361582300057Scopus ID: 2-s2.0-84952018798Local ID: 8da282bc-cc96-458d-a0a4-55e25aaeefa7OAI: oai:DiVA.org:ltu-10106DiVA, id: diva2:983046
Note

Validerad; 2015; Nivå 2; 20150802 (parj)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Jonsén, PärHäggblad, Hans-åkeGustafsson, Gustaf

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