Micromechanical Modeling of Elastic-Viscoplastic Behavior of Armco-Fe at High Strain Rate
Heterogeneous dynamical stress-strain response of Armco-Fe was investigated at high strain rates through the Split Hopkinson Pressure Bar (SHPB) testing. It was found that the viscoplastic deformation in BCC ferrite grains is affected by the strain rate. Thermal softening and variation in crystal orientations under high-strain-rate loading were used in the elastic-viscoplastic modeling. The micromechanical analysis with self-consistent transition and homogenization was used for estimation of the global impact response of the material. The results from modeling were found in good agreement with the experimental data.
Key WordsArmco-Fe high strain rate visco-plastic deformation self consistent SHPB
Unable to display preview. Download preview PDF.
- 3.Gao, C.Y. and Zhang, L.C., Constitutive modelling of plasticity of fcc metals under extremely high strain rates. Int. J. Plast., 2012, 32–33: 121–133.Google Scholar
- 6.Berveiller, M. and Zaoui, A., A simplified self-consistent scheme for the plasticity of two-phase metals. Res. Mech. Lett., 1981, 1: 119–124.Google Scholar
- 10.Voyiadjis, G.Z. and Abed, F.H., Microstructural based models for bcc and fcc metals with temperature and strain rate dependency. Mech. Mater., 2003, 37(2–3): 55–378.Google Scholar
- 14.Rossiter, J., Brahme, A., Simha, M.H., Inal, K. and Mishra, R., A new crystal plasticity scheme for explicit time integration codes to simulate deformation in 3D microstructures: Effects of strain path, strain rate and thermal softening on localized deformation in the aluminum alloy 5754 during simple shear. Int. J. Plast. , 2010, 26: 1702–1725.CrossRefMATHGoogle Scholar
- 15.Bunge, H.J., Texture Analysis in Materials ScienceButterworths. London: Butterworths, 1982.Google Scholar
- 17.Bao, W.P., Ren, X.P. and Zhang, Y., The characteristics of flow stress and dynamic constitutive model at high strain rates for pure iron. J. Plast. Eng., 2009, 16(5): 126–129.Google Scholar