Determination of the Johnson-Cook fracture model parameters for sheet metal based on the uniaxial tensile test, bulge test, and a modified Miyauchi shear test
- verfasst von
- B. A. Behrens, A. Bouguecha, M. Vucetic, I. Peshekhodov
- Abstract
An approach to determine the parameters of the quasistatic isothermal part of the Johnson-Cook fracture model for sheet metal with the help of the uniaxial tensile test, bulge test, and a modified Miyauchi shear test accompanied with the optical strain measurement is presented. The uniaxial tensile test was performed according to the ISO 6892 on specimens with 30 mm wide gauge section. The bulge test was carried out on the blanks with the diameter of the deformation zone of 200 mm based on the recommendations of the related IDDRG German working group. The shear test was conducted in a universal testing machine on modified Miyauchi shear specimens. The specimen modifications undertaken in the present study are related to the geometry of the shear zones and help minimize strain concentrations at the edges and increase plastic strains in the material interior. To demonstrate the advantages of the new specimen geometry, some results of the FEA-based optimization are given. With the help of the proposed approach, plastic strain to fracture can be estimated at three distinctly different stress states at relatively low experimental costs. The obtained data makes unique parameterization of the model possible for a wide range of stress states. Exemplarily, the parameter set for a cold-reduced high-strength IF steel sheet is given.
- Organisationseinheit(en)
-
Institut für Umformtechnik und Umformmaschinen
- Typ
- Aufsatz in Konferenzband
- Seiten
- 945-950
- Anzahl der Seiten
- 6
- Publikationsdatum
- 01.12.2011
- Publikationsstatus
- Veröffentlicht
- Peer-reviewed
- Ja
- ASJC Scopus Sachgebiete
- Polymere und Kunststoffe
