Non-proportional/Non-monotonous Deformation Modeling of an Ultra High Strength Automotive Steel Sheet
Abstract
In this work, as non-proportional/non-monotonous deformation experiments, two-stage and tension-compression-tension uniaxial tests were performed, respectively, for a cold rolled ultra high strength dual phase steel sheet: DP780. Deformation behaviors under such deformation paths were found different than those of the ultra low carbon single phase steels observed by Verma et al. (Int. J. Plast. 2011, 82-101). To model the newly observed deformation behaviors, the combined type constitutive law previously proposed by Verma et al. (Int. J. Plast. 2011, 82-101) was successfully applied here. Permanent softening observed during reverse loading was properly characterized into the isotropic and kinematic hardening parts of the hardening law using tension-compression-tension test data. The cross effect observed in two-stage tests was also effectively incorporated into the constitutive law.
- Publication:
-
The 8th International Conference and Workshop on Numerical Simulation of 3D Sheet Metal Forming Processes (NUMISHEET 2011)
- Pub Date:
- August 2011
- DOI:
- 10.1063/1.3623612
- Bibcode:
- 2011AIPC.1383..202V
- Keywords:
-
- deformation;
- hardening;
- Young's modulus;
- simulation;
- 81.40.Lm;
- 81.40.Ef;
- 81.40.Jj;
- 02.60.Cb;
- Deformation plasticity and creep;
- Cold working work hardening;
- annealing post-deformation annealing quenching tempering recovery and crystallization;
- Elasticity and anelasticity stress-strain relations;
- Numerical simulation;
- solution of equations