Identification Of Material Constitutive Law
Constants Using Machining Tests:
A Response Surface Methodology
Based Approach
Author(s)
M. Daoud, W. Jomaa, J. F. Chatelain, A. Bouzid & V. Songmene
Abstract
The finite element modeling (FEM) of chip formation is one of the most reliable
tools for the prediction and optimization of machining processes; thanks to the
high performance of advanced computers and robust finite element codes which
made the modeling of complex machining processes (turning, milling, and
drilling) possible. The success of any FEM strongly depends on constitutive law
which characterizes the thermo-mechanical behavior of the machined materials.
Johnson and Cook’s (JC) constitutive model is widely used in the modeling of
machining processes. However, one can find in the literature, different
coefficients of JC’s constitutive law for the same material which can
significantly affect the predicted results (cutting forces, temperatures, etc.).
These differences were attributed to the different methods used for the
determination of the material parameters. In the present work, an inverse method,
based on orthogonal machining tests, was developed to determine the parameters
of the JC constitutive law. The originality of this study lies in the use of the
response surface methodology (RSM) as a technique to improve the existing
inverse method. The studied material is a 6061T6 high strength aluminum alloy.
It is concluded that the calculated flow stresses obtained from the proposed
approach were in a good agreement with the experimental ones. Moreover, the
material parameters obtained from the present study predict more accurate values
of flow stresses as compared to those reported in the literature.
Keywords: Johnson-Cook constitutive law, identification, inverse method,
response surface methodology, machining, AA6061-T6.
Keywords
Johnson-Cook constitutive law, identification, inverse method,
response surface methodology, machining, AA6061-T6.
Related Book
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