Modelling of the internal stress in dislocation cell structures |
| |
Authors: | EM Viatkina WAM Brekelmans MGD Geers |
| |
Institution: | aDepartment of Mechanical Engineering, Section of Materials Technology, Eindhoven University of Technology, P.O. Box 513, 5600 MB Eindhoven, The Netherlands;bNetherlands Institute for Metals Research (NIMR), P.O. Box 5008, 2600 GA Delft, The Netherlands |
| |
Abstract: | The nonuniform distribution of dislocations in metals gives rise to material anisotropy and internal stresses that determine the mechanical response. This paper proposes a micromechanical model of a dislocation cell structure that accounts for the material inhomogeneity and incorporates the internal stresses in a physically-based manner. A composite model is employed to describe the material with its dislocation cell structure. The internal stress is obtained as a natural result of plastic deformation incompatibility and incorporated in the composite model. Applications of this model enable the prediction of the mechanical behavior of metals under various nonuniform deformations. The implementation of the model is relatively straightforward, allowing easy use in macroscopic engineering computations. |
| |
Keywords: | Dislocation cell structure Internal stress Geometrically necessary dislocations Strain path change effects Kinematic hardening |
本文献已被 ScienceDirect 等数据库收录! |