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A combined material model for numerical simulation of hot isostatic pressing
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.ORCID iD: 0000-0002-7514-0513
2000 (English)In: Computer Methods in Applied Mechanics and Engineering, ISSN 0045-7825, E-ISSN 1879-2138, Vol. 189, no 3, p. 901-913Article in journal (Refereed) Published
Abstract [en]

In modelling of hot isostatic pressing (HIP) of powder materials the constitutive model should be able to describe different deformation mechanisms during the consolidation process. In the early stage, the consolidation is dominated by granular behaviour. As temperature and pressure increase in the powder the deformation can be described by a viscoplastic model. Experimental observations show substantial time-independent deformation in the early stage. At this stage of the densification process, pores in the powder are still interconnected. This cannot be described properly by a viscoplastic model. The inconsistency between the deformation mechanisms can be treated by a combined elasto-plastic and elasto-viscoplastic model. Here a granular plasticity model is combined with a viscoplastic model. In previous works the viscoplastic model, power-law breakdown, has been used to describe the entire deformation process. The combined model is implemented into an in-house finite deformation code for the solution of coupled thermomechanical problems. The simulation of a hot isostatic pressing test with dilatometer is performed in order to compare calculated results with the experimental measurement. The results from previously performed analysis carried out with a viscoplastic model only are also compared. Analysis with the combined material model shows good agreement with the experiment for the whole densification process.

Place, publisher, year, edition, pages
2000. Vol. 189, no 3, p. 901-913
National Category
Other Materials Engineering Applied Mechanics
Research subject
Material Mechanics; Solid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-15294DOI: 10.1016/S0045-7825(99)00406-5ISI: 000089387700010Scopus ID: 2-s2.0-0034282373Local ID: ec987cf0-4f86-11db-9592-000ea68e967bOAI: oai:DiVA.org:ltu-15294DiVA, id: diva2:988268
Note
Validerad; 2000; 20060915 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Wikman, BengtSvoboda, AlesHäggblad, Hans-åke

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