A User-friendly 3D Yield Function for Steel Sheets and Its Application
Abstract
A 6th-order polynomial type 3D yield function, which has a high flexibility of describing anisotropic behavior of steel sheets is proposed. A user-friendly scheme of material parameter identification for the model, where only limited experimental data of r-values and yield stresses in three directions (r0,r45,r90 and σ0,σ45,σ90) plus equi-biaxial yield stress (σx = σy = σb) are needed, is presented. The accuracy of this yield function is verified by comparing the numerical predictions with the corresponding experimental data on planar anisotropy of r-values and flow stress directionality, as well as the shape of yield loci, on several types of steel sheets (high r-value IF steel and high strength steel sheets of 440-980 MPa TS levels). The advantage of this model is demonstrated by showing a numerical simulation of hole-expansion test.
- Publication:
-
The 8th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes (NUMISHEET 2011)
- Pub Date:
- August 2011
- DOI:
- 10.1063/1.3623689
- Bibcode:
- 2011AIPC.1383..807Y
- Keywords:
-
- yield stress;
- numerical analysis;
- forming processes;
- plasticity;
- 83.60.La;
- 02.60.Cb;
- 81.20.Hy;
- 81.40.Lm;
- Viscoplasticity;
- yield stress;
- Numerical simulation;
- solution of equations;
- Forming;
- molding extrusion etc.;
- Deformation plasticity and creep