A Elasto-Plastic Constitutive Model Based on Chaboche Kinematic Hardening of Aluminum Alloy 7050-T7451

Resumo

The elasto-plastic behavior of the aluminum alloy 7050-T7451 subjected to cyclic loading was
investigated and modeled. The objective of this work is to improve the constitutive model of Chaboche with a
special emphasis in the compression. In the proposed model, the part under tension of the stress-strain curve in
the stable hysteresis cycle is modeled separately from the compressed one, where it is considered that they have
different Modulus of Elasticity. The work includes both simulation and experimental data, and they are

compared to each other. The values were collected experimentally by the application of symmetric cyclic strain-
driven loading in the strain range between 0.75% and 2.25%. The experimental results were used to calculate the

parameters of the constitutive model in a MATLAB® software. The responses obtained with the proposed model
have greater adherence to the experimental results than those obtained with the Chaboche model.