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Modeling of multi-phase microstructures in press hardened components plastic deformation and fracture in different stress states
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.ORCID iD: 0000-0002-5099-6462
Gestamp HardTech.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Mechanics of Solid Materials.
2017 (English)Conference paper (Refereed)
Abstract [en]

Hot stamping or press hardening is an industrialized technique with the aim of improving material properties by heat treatment and forming of a component in a single production stage. Within the field of press hardening the method of tailored material properties evolved. Components with tailored material properties possess different mechanical properties in designated areas. This paper presents an approach for modeling the mechanical response of mixed microstructures under different stress states. A homogenization method is used to predict the hardening of the material; the strain decomposition provides the possibility of applying a fracture criterion per phase. To validate the modeling approach for different stress states a set of samples with different notch and hole geometries as well as microstructural composition are produced. The combination of a homogenization method and a fracture criterion show good agreement with experimental results. The homogenization method is suitable to predict the hardening of the material with good accuracy. Fracture for different microstructural compositions is well predicted over a range of stress triaxialities relevant for sheet metal applications. It is concluded that the use of a homogenization method combined with a fracture model can be used to predict the mechanical response of mixed microstructures for a range of different stress states.

Place, publisher, year, edition, pages
2017.
National Category
Other Mechanical Engineering Applied Mechanics
Research subject
Solid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-64055OAI: oai:DiVA.org:ltu-64055DiVA: diva2:1110105
Conference
36th IDDRG Conference, Munich, 2-6 July 2017
Available from: 2017-06-15 Created: 2017-06-15 Last updated: 2017-06-22

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