J. Phys. IV France
Volume 110, September 2003
Page(s) 411 - 416

J. Phys. IV France
110 (2003) 411
DOI: 10.1051/jp4:20020728

Measurement of temperature coupling by thermovision and constitutive relation at high strain rates for the dual phase sheet steel

A. 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  $10^{-4}\le \dot{\gamma}\le 10^{-3}$ s -1 up to large shear strains, $\gamma\approx 1$. 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, [1], 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 [2]. 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, [3].

© EDP Sciences 2003