Avaliação do comportamento dos aços AISI1020 e de roda forjada classe C frente ao shakedown a partir de ensaios de indentações sucessivas

Abstract

In order to understand the cyclic loading phenomena, such as elastic shakedown, plastic shakedown or ratchetting, successive indentation tests were carried out. Two normal loads were used, 62.5 and 187.5 kgf, and the methodology consisted of repeated Brinell hardness tests up to 80 cycles on forged wheel AAR Class C and AISI 1020 steels, for which more cyclic hardening data is available in the literature. Aiming to reproduce the experimental results, the finite element software ABAQUS and the Chaboche nonlinear kinematic hardening rule have been chosen. An analysis of C e γ influences, with an author stipulated area, allowed an efficient estimation of the final hardening parameters. The numerical curves were verified aiming to reproduce another set of successive indentations tests up to 40 cycles. The numerical results, in terms of contact area as a function of the number of cycles, presented relative errors below 15%, in comparison with experimental data.