论文信息 - Strain Hardening at Large Strains as Predicted by Dislocation Based Polycrystal Plasticity Model

Strain Hardening at Large Strains as Predicted by Dislocation Based Polycrystal Plasticity Model

A recent strain hardening model for late deformation stages (Estrin, Y., Toth, L.S., Molinari, A., and Brechet, Y., Acta Materialia, 1998, A dislocation-based model for all hardening stages in large strain deformation, Vol. 46, pp. 5509-5522) was generalized for the 3D case and for arbitrary strain paths. The model is based on a cellular dislocation arrangement in which a single- phase material is considered as a composite of a hard skeleton of cell walls and soft cell interiors. An important point in the approach is the evolution of the volume fraction of the cell walls which decreases with the deformation and gives rise to a plateau-like behavior (Stage IV) followed by a drop-off (Stage V) of the strain hardening rate observed at large strains. The hardening model was implemented into the viscoplastic self-consistent polycrystal model to predict hardening curves corresponding to different proportional loading paths. The calculated curves were evaluated to elucidate the path dependence of hardening.

[1] H. Stuwe,et al. Large-strain hardening curves corrected for texture development , 1999 .

[2] P. Van Houtte,et al. Large strain work hardening and textures , 1980 .

[3] Yuri Estrin,et al. 2 – Dislocation-Density–Related Constitutive Modeling , 1996 .

[4] P. Haasen,et al. A new mechanism of work hardening in the late stages of large strain plastic flow in F.C.C. and diamond cubic crystals , 1993 .

[5] A. Molinari,et al. Tuning a self consistent viscoplastic model by finite element results—I. Modeling , 1994 .

[6] M. Zehetbauer,et al. Cold work hardening in stages IV and V of F.C.C. metals—I. Experiments and interpretation , 1993 .

[7] S. Bernstorff,et al. Investigation of the Microstructural Evolution During Large Strain Cold Working of Metals by Means of Synchrotron Radiation—A Comparative Overview , 2002 .

[8] S. Ahzi,et al. A self consistent approach of the large deformation polycrystal viscoplasticity , 1987 .

[9] K. Krausz,et al. Unified constitutive laws of plastic deformation , 1996 .

[10] L. Toth,et al. Dislocation structure and work hardening in polycrystalline ofhc copper rods deformed by torsion and tension , 1986 .

[11] T. Ungár,et al. Asymmetric X-ray Line Broadening of Plastically Deformed Crystals. II. Evaluation Procedure and Application to (001)-Cu Crystals , 1989 .

[12] Laszlo S. Toth,et al. A dislocation-based model for all hardening stages in large strain deformation , 1998 .