Abstract
This paper deals with a parametric identification technique, based on the 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 specimens, tubular and cylindrical “dumbbell”, are tested at different strain rates, from 10 −3 to 130 s −1, and for impact velocities ranging from 5 mm/min 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.
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