Issue |
J. Phys. IV France
Volume 134, August 2006
EURODYMAT 2006 - 8th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
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Page(s) | 75 - 80 | |
DOI | https://doi.org/10.1051/jp4:2006134013 | |
Published online | 26 July 2006 |
J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 75-80
DOI: 10.1051/jp4:2006134013
Experimental investigations and modelling of strain rate and temperature effects on the flow behaviour of 1045 steel
L.W. Meyer1, T. Halle1, N. Herzig1, L. Krüger2 and S.V. Razorenov31 Chemnitz University of Technology, Materials and Impact Engineering, 09107 Chemnitz, Germany
2 Technische Universität Bergakademie Freiberg, Institut für Werkstofftechnik, Gustav-Zeuner-Straße 5, 09599 Freiberg, Germany
3 High Energy Density Research Center, IVTAN, Izhorskaya 13/19, Moscow 127412, Russia
Published online: 26 July 2006
Abstract
If structures have to be designed to sustain low and high
loading rates, the appropriate constitutive equations are essential for the
accurate modelling of the structural response. However, a lack of the
required data is observed very often, especially, if a very wide range of
strain rates has to be covered. Therefore, the flow behaviour of the steel
1045 (C45E) was investigated with defined chemical composition and
microstructure in a very wide range of strain rates between 10-4 and
105 1/s and different temperatures. The rate-dependent thermomechanical
behaviour was determined using low strain rate (10-4 to 100 1/s)
servo-hydraulic compression testing, high strain rate (~102 1/s
and 103 1/s) compression drop weight testing and split Hopkinson
pressure bar testing, and for very high strain rates (105 1/s) the
plate-impact test. Additionally, strain rate jump tests at relatively low
strain rates and different temperatures were performed to determine the
activation volume at constant temperature and deformation. The measured flow
stresses as well as the strain and strain rate hardening behaviour as a
function of strain rate and test temperature are discussed in terms of the
microstructural deformation processes. The theory of thermally activated
flow is applied and compared to the widely used models like the Johnson-Cook
model and a dislocation drag model. The occurrence of possible dislocation
drag effects is discussed in conjunction with the measured data. Our results
show, that the strain rate dependence of the flow stress of 1045 steel can
be described completely by the theory of thermal activation up to strain
rates of 105 1/s.
© EDP Sciences 2006