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Estimate of material parameters using inverse modelling and their application to sheet metal forming simulations
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Material- och solidmekanik.ORCID-id: 0000-0002-4634-4373
Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik.ORCID-id: 0000-0002-6209-9355
2004 (engelsk)Inngår i: Materials Processing and Design: Modeling, Simulation and Applications (NUMIFORM 2004) / [ed] Somnath Ghosh, Melville, NY: American Institute of Physics (AIP), 2004, s. 869-874Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

In metal forming operations the stress and strain levels can locally reach much higher magnitudes than those measurable in a standardised uniaxial tension test. Additionally, the stress and strain states are in many cases multi-axial. In this paper an inverse method to obtain material data is proposed. The aim is to yield more accurate data for a wider range of strain compared to a standard uniaxial tensile test. The outline of the work is that a forming experiment is designed to reproduce tensile strains present in a full-scale cold forming process. The blanks used are made of relatively thick high strength hot-rolled steel. Process data from experiments, i.e. punch force and punch displacement, are used as input to an in-house optimisation software package. The direct problem solved in the inverse modelling and optimisation scheme is a finite element analysis (FEA) of the experiment. The goal is to find parameters in a constitutive model of the material that minimises the difference between experimental and FE-calculated data. The experiments are modelled in a commercial FE software. Four different isotropic hardening laws are used in the FE-model. One of the optimised models is applied in a forming simulation and geometric optimisation of a demonstrator part.

sted, utgiver, år, opplag, sider
Melville, NY: American Institute of Physics (AIP), 2004. s. 869-874
Serie
A I P Conference Proceedings Series, ISSN 0094-243X ; 712
HSV kategori
Forskningsprogram
Hållfasthetslära; Datorstödd maskinkonstruktion
Identifikatorer
URN: urn:nbn:se:ltu:diva-35891DOI: 10.1063/1.1766636Lokal ID: a9e4e580-8c7e-11db-8975-000ea68e967bISBN: 0-7354-0188-8 (tryckt)OAI: oai:DiVA.org:ltu-35891DiVA, id: diva2:1009145
Konferanse
International Conference on Numerical Methods in Industrial Forming Processes : 13/06/2004 - 17/06/2004
Merknad
Godkänd; 2004; 20061215 (ysko)Tilgjengelig fra: 2016-09-30 Laget: 2016-09-30 Sist oppdatert: 2022-06-01bibliografisk kontrollert

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