Abstract:
Present work makes possible the understanding and the analysis of hot forming process of metals. It is done by experimental validation of the Johnson-Cook model to describe the behavior of materials in the plastic regime, at large deformations, high deformation rates and high temperatures. An understanding of parameters of the model using a simple, fast and reliable analytical numerical method was previously developed by research area in Plastic Forming of Metals at UNESP - Ilha Solteira Campus, obtaining the empirical constants of the model mentioned. This work proposes the experimental validation of the simplified method for determination of empirical parameters of Johnson-Cook’s model, through a heat traction test, considering the mechanical properties of experimentally analyzed materials and material data available in the literature. In general, the experimental results were satisfactory for AISI 1045 steel at temperature of 500 ºC, tested at the strain rate of 1000 s-1, when compared to theoretical results predicted by the model proposed by SCADUTO and MENEZES. In particular, it was possible to show maximum errors of 1,33% for parameter n, 13.15% for parameter B, 295.00% for parameter C and 4.14% for parameter m.