Experimental Characterisation and Modelling of the Thermo-Viscoplastic Behaviour of Steel AISI 304 within Wide Ranges of Strain Rate at Room Temperature Articles uri icon

publication date

  • June 2010

start page

  • 1027

end page

  • 1042

issue

  • 4

volume

  • 48

international standard serial number (ISSN)

  • 1429-2955

abstract

  • In this investigation, thermo-viscoplastic behaviour of austenitic steel AISI 304 has been characterised in tension under wide ranges of strain rate at room temperature. This metal possesses an elevated strain
    hardening rate and ductility which enhance its capability for
    absorbing energy under mechanical loading. It has been observed that the
    rate sensitivity of the material is independent of plastic strain.
    Moreover, it has been noticed that beyond a certain level of loading
    rate the flow stress of the material sharply increases. In agreement
    with experimental evidences reported in the literature, this behaviour
    is assumed to be caused by the drag deformation mode taking place at
    high strain rates. Based on such considerations, the thermo-viscoplastic
    behaviour of the material has been macroscopically modelled by means of
    the extended Rusinek-Klepaczko model to viscous drag effects.
    Satisfactory matching has been found between the experiments and
    analytical predictions provided by the constitutive relation.