Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
A new computational method for determining the parameters of Johnson-Cook model
Submission Author:
Carlos Alberto Alves Viana , SP
Co-Authors:
Carlos Alberto Alves Viana, Gustavo Fernando Scaduto, Miguel Ângelo Menezes
Presenter: Carlos Alberto Alves Viana
doi://10.26678/ABCM.COBEM2017.COB17-2129
Abstract
It is known for long that the study of plastic deformation of metals is extremely important to have full knowledge of the forces acting on a given process. Currently, various mechanical processes occur at high strain rates, such as the ballistic area, impact test vehicles, boilers explosion, and the failure of the sheet metal forming processes. The understanding of the processes is related to the study of the mechanics of the process, which seeks to determine the reasons why failures occur. Particularly, in cases involving high strain rates, it is common to use the Johnson-Cook model, fine detailing the stress field in such cases that can also be included the effect temperature. In this model, we can see the influence of the elastic-plastic term, which characterizes the elastic and plastic fields of the material, the presence of the viscous term, which shows the influence of the strain rate in the process and the term of thermal softening, which introduces the influence of temperature. A problem encountered by those who use this model is the difficulty in getting the parameters. Currently there is no simple, concise and clear methodology for this calculation and those in need of the equation must resort to literature, which rarely have such methodologies and procedures, or develop your own method.
Keywords
Forming of Metals, Strain rate, Temperature in metal forming, Johnson-Cook model
