Thermoviscoplastic Response of Cylindrical Structures Using a State Variable Model

摘要

A number of combined creep-plasticity constitutive models with state variables have been recently proposed to describe time-dependent inelastic deformation of metals at elevated temperatures. Some of these models seem capable of more faithfully predicting material behavior under complex mechanical and thermal loading histories than is currently possible with traditional models which use separation of time-independent plasticity and time-dependent creep. For some time interest in the efficient numerical solution of boundary value problems using constitutive models was shown. A particularly promising model was used in the calculations. This model has been used to predict the uniaxial responses of several metals and alloys to various types of loading histories. The correlation between model predictions and experiments was found to be very good. Stresses and deformation in cylindrical structures subjected to time-dependent axisymmetric mechanical and thermal loads was studied. Several physically observed phenomena that cannot be simulated by traditional models are discussed. The computational scheme used is very efficient. (ERA citation 04:051927)