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Finite element simulation of the tool steel stress response as used in a hot forging
Luleå tekniska universitet.
Department of Materials Engineering, Karlstad University.
Department of Materials Engineering, Karlstad University.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.ORCID iD: 0000-0001-5493-6873
2004 (English)In: Materials Processing and Design: Modeling, Simulation and Applications (NUMIFORM 2004) / [ed] Somnath Ghosh, Melville, NY: American Institute of Physics (AIP), 2004, p. 560-565Conference paper, Published paper (Refereed)
Abstract [en]

Hot-work forging tools are subjected to severe and complex loading conditions (cyclic stress/strain conditions, varying strain rates, varying temperature, environmental damage), leading to short die life. There is also a temperature and time dependant material response to consider. Presently, hot-forging of a steel crankshaft is approached by a combined experimental and numerical simulation study of a hot-work tool steel. The forging conditions were investigated by thermal measurements and damage analysis. Laboratory testing by isothermal fatigue in the temperature range 200 - 600DGC was performed. An elasto-plastic kinematic and isotropic hardening model (according to Chaboche) was used to model the material behaviour where the material parameters were derived from the experimental part. Viscoplastic effects are not accounted for in the material model as they have minor influence on the stress-strain relation in the experimental setup. The model was implemented in a FEM program (MSC.Marc) using a semi-implicit time integration scheme according to Shin and Ortiz, and evaluated by modelling of the isothermal fatigue tests. The FE-results managed to describe the materials general behavior, the correlation between the experimental simulated values were however not satisfactory due to influence of factors in the parameter derivation. Important features of the material behaviour are the cyclic softening and its dependence of the temperature, and also the strain path history. The long-term goal is to fully analyze the hot-forging die in service by numerical simulation and to study the influence of manufacturing processes on die properties.

Place, publisher, year, edition, pages
Melville, NY: American Institute of Physics (AIP), 2004. p. 560-565
Series
A I P Conference Proceedings Series, ISSN 0094-243X ; 712
National Category
Other Mechanical Engineering
Research subject
Computer Aided Design
Identifiers
URN: urn:nbn:se:ltu:diva-31518DOI: 10.1063/1.1766585Local ID: 5b685120-8c7f-11db-8975-000ea68e967bISBN: 0-7354-0188-8 (print)OAI: oai:DiVA.org:ltu-31518DiVA, id: diva2:1004752
Conference
International Conference on Numerical Methods in Industrial Forming Processes : 13/06/2004 - 17/06/2004
Note
Validerad; 2004; 20061215 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2018-05-09Bibliographically approved

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Näsström, Mats

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