Large Deformation Plasticity of Polycrystalline Tantalum
Abstract
A physical, crystal mechanics-based theory of thermo-elasto-viscoplasticity which is valid for large strains and high strain rates at low homologous temperatures has been formulated. The theory is able to predict the macroscopic anisotropic stress-strain response, the evolution of crystallographic texture, and the macroscopic shape changes for b.c.c. tantalum. The material functions and parameters in the model were determined by calibrating the model against existing experimental results for tantalum. The model reproduces the data of these researchers rather well. The constitutive model has been implemented in the finite element program ABAQUS Explicit by writing a 'user material' subroutine. The ability of the constitutive model and computational procedures to capture the effect of initial texture on the final shape under high strain rates and large strains was evaluated by carrying out a simulation of a Taylor rod-impact experiment and by comparing the predicted final shape to that observed experimentally.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 21, 2000
- Accession Number
- ADA385746
Entities
People
- Lallit Anand
Organizations
- Massachusetts Institute of Technology