Open AccessA Model for High-Strain-Rate Deformation of Uranium-Niobium Alloys
Author(s) -
F. L. Addessio,
Q. H. Zuo,
Thomas A. Mason,
L. C. Brinson
Publication year - 2003
Language(s) - English
Resource type - Reports
DOI - 10.2172/812163
Subject(s) - materials science , niobium , plasticity , strain rate , deformation (meteorology) , phenomenological model , uranium , metallurgy , thermodynamics , elasticity (physics) , mechanics , nonlinear system , composite material , condensed matter physics , physics , quantum mechanics
A thermodynamic approach is used to develop a framework for modeling uranium-niobium alloys under the conditions of high strain rate. Using this framework, a three-dimensional phenomenological model, which includes nonlinear elasticity (equation of state), phase transformation, crystal reorientation, rate-dependent plasticity, and porosity growth is presented. An implicit numerical technique is used to solve the evolution equations for the material state. Comparisons are made between the model and data for low-strain-rate loading and unloading as well as for heating and cooling experiments. Comparisons of the model and data also are made for low- and high-strain-rate uniaxial stress and uniaxial strain experiments. A uranium-6 weight percent niobium alloy is used in the comparisons of model and experiment