A modified Johnson-Cook model for strain rates ranging from 10 to 105 s

Issue		J. Phys. IV France Volume 134, August 2006 EURODYMAT 2006 - 8th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading


Page(s)		87 - 93
DOI		10.1051/jp4:2006134015
Published online		26 July 2006

EURODYMAT 2006 - 8th International Conference on Mehanical and Physical Behaviour of Materials under Dynamic Loading
J. Cirne, R. Dormeval, et al.
J. Phys. IV France 134 (2006) 87-93
DOI: 10.1051/jp4:2006134015

A modified Johnson-Cook model for strain rates ranging from 10 $^{\mbox{-}3}$ to 10⁵ s $^{\mbox{-}1}$

H. Couque¹, R. Boulanger¹ and F. Bornet²

¹ Giat Industries, Division Munitions, 7 route de Guerry, 18023 Bourges, France
² Eurosim-Mecalog, 27 avenue des Alliès, 25200 Montbéliard, France

Published online: 26 July 2006

Abstract
A modified Johnson-Cook model is proposed to take into account the thermally activated and viscous regimes that can be easily integrated in numerical codes. The model was calibrated using experimental data generated at temperatures ranging from 23 to 1000 $^{\circ}$ C and strain rates ranging from 0.002 to $3 \times 10^{4}$ s^-1 and validated through numerical simulations of symmetric Taylor tests for a pure nickel and a high strength nickel alloy.

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