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Characterisation methods and simulation of deformation and failure in metal forming processes
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.ORCID-id: 0000-0002-4634-4373
2010 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

Tools for numerical analysis is a prerequisite in product development. Variations of the finite element method is widely used for simulation of metal manufacturing processes, for example sheet metal forming and hot stamping. However accurate the models are, there is still the issue of parameter estimation for the constitutive models used in the simulations.The increased use of high-strength steel in metal manufacturing processes necessitates forming at elevated temperatures. Formblowing and hardening (FH), where an austenitized profile blank is formed in a closed tool by injection of pressurised gas followed by rapid water cooling, is a recent development.The objectives are to increase knowledge regarding: characterisation methods for parameter estimation in constitutive models; numerical simulations of metal forming processes at elevated temperatures.Experimental material characterisation tests have been performed for deformation levels beyond plastic instability in standard tests. Methods for field measurements of deformation have been applied. Measurements were combined with inverse modelling for parameter estimation. Thermomechanical simulation models of the FH process have been developed. Complete process simulations were performed and compared with experiments. A pre-bursting failure criteria were implemented and compared with experimental burst tests.

sted, utgiver, år, opplag, sider
Luleå: Luleå tekniska universitet, 2010. , s. 34
Serie
Doctoral thesis / Luleå University of Technology 1 jan 1997 → …, ISSN 1402-1544
HSV kategori
Forskningsprogram
Hållfasthetslära
Identifikatorer
URN: urn:nbn:se:ltu:diva-18511Lokal ID: 8f9d72f0-1641-11df-bae5-000ea68e967bISBN: 978-91-7439-084-1 (tryckt)OAI: oai:DiVA.org:ltu-18511DiVA, id: diva2:991520
Disputas
2010-03-12, E231, Luleå tekniska universitet, Luleå, 10:00
Opponent
Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2023-11-29bibliografisk kontrollert

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Lindkvist, Göran

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