DD3MAT - a code for yield criteria anisotropy parameters identification.

10th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes

Barros, P.D.^1 ; Carvalho, P.D.^1 ; Alves, J.L.^2 ; Oliveira, M.C.^1 ; Menezes, L.F.^1

CEMUC, Mechanical Engineering Department, University of Coimbra, Polo II, Rua Luís Reis Santos, Pinhal de Marrocos, Coimbra

3030-788, Portugal^1

CMEMS, Microelectromechanical Systems Research Unit, University of Minho, Campus de Azurém, Guimarães

4800-058, Portugal^2

关键词: Anisotropy parameters;    Biaxial stress state;    Downhill simplex method;    Experimental values;    In-plane compression;    In-plane tensions;    Rolling direction;    User intervention;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/734/3/032053/pdf
DOI  :  10.1088/1742-6596/734/3/032053

来源: IOP

【 摘 要 】

This work presents the main strategies and algorithms adopted in the DD3MAT inhouse code, specifically developed for identifying the anisotropy parameters. The algorithm adopted is based on the minimization of an error function, using a downhill simplex method. The set of experimental values can consider yield stresses and r -values obtained from in-plane tension, for different angles with the rolling direction (RD), yield stress and r -value obtained for biaxial stress state, and yield stresses from shear tests performed also for different angles to RD. All these values can be defined for a specific value of plastic work. Moreover, it can also include the yield stresses obtained from in-plane compression tests. The anisotropy parameters are identified for an AA2090-T3 aluminium alloy, highlighting the importance of the user intervention to improve the numerical fit.