Constitutive models characterisation for XC48 steel in compression by a parametric identification technique
by B. Langrand, E. Markiewicz, P. Drazetic, P. Geoffroy, J.L. Petitniot, J. Fabis
International Journal of Materials and Product Technology (IJMPT), Vol. 12, No. 4/5/6, 1997

Abstract: This paper deals with a parametric identification technique, based on conjugate gradient methods. As part of this research, compression tests are performed on a XC48 steel (AFNOR norm 1048AISI), which is strain rate sensitive. Two kinds of specimen, tubular and cylindrical 'dumbbells', are tested at different strain rates, from to 10⁻³ to 130s⁻¹, and for impact velocities ranging from 5 mm/mn to 6 m/s. The parameters of the Johnson-Cook constitutive model are evaluated directly from the XC48 steel compression stress-strain diagrams expressed in terms of true stress and strain measurements. These parameters are next used as input data for a FE crash simulation of the tubular specimen. Comparison with experimental results prove the validity of the identified parameters.

Online publication date: Tue, 02-Nov-2010

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