J. Phys. IV France 110 (2003) 411
Measurement of temperature coupling by thermovision and constitutive relation at high strain rates for the dual phase sheet steelA. Rusinek1, W.K. Nowacki2, P. Gadaj2 and J.R. Klepaczko1
1 Laboratory of Physics and Mechanics of Materials (LPMM), Université de Metz, Ile du Saulcy, 57045 Metz, France
2 Institute of Fundamental Technological Research (IPPT), Polish Academy of Sciences, Ul. Swietokrzyska 21, 00-049 Warszawa, Poland
The paper presents an original experimental set-up to study the thermo-visco-plastic behavior of a dual phase sheet steel DP 600. It is also shown how to determine the temperature gradients during shear test at different strain rates varying from s -1 up to large shear strains, . The temperature increments are measured by an infrared camera recording the infrared radiation emitted from the shear zone during the process of plastic deformation. Due to combination of a fasthydraulic machine and the direct impact technique with the Hopkinson tube, , together with an infrared camera, it was possible to find the stress evolution with the shear strain and the local temperature in the shear zone . At the same time it was possible to estimate the strain rate when the adiabatic shear bands appear. Moreover, an original thermovisco- plastic constitutive relation is proposed and compared with that by Johnson-Cook, .
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