Engineering Transactions, 60, 3, pp. 215–223, 2012

Identification of Johnson-Cook Equation Constants using Finite Element Method

Michał GRĄZKA
Military University of Technology, Institute of Armament Technology

Jacek JANISZEWSKI
Military University of Technology, Institute of Armament Technology

The objective of this work is to develop an identification technique of the Johnson-Cook
equation constants for copper Cu-ETP samples. In this paper we describe a method of constant
identification using the Taylor impact test and finite element analysis. Nowadays the most
popular method of constant identification method is the split Hopkinson pressure bar technique.
This method is quite easy but needs very expensive laboratory equipment. To implement this
method we have to make a lot of different tests in order to have enough information about
dynamic properties. We decided to prepare an identification process algorithm using the Taylor
impact test as a basic type of experimental and numerical simulation.
Keywords: Johnson-Cook material model, finite element analysis, identification and opti- mization procedures
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