A constitutive relation is proposed that is suitable for high temperature isothermal, creep, and thermo-mechanical loading. The form of the flow rule in this relation, is established from measurements of initial yield strength. This procedure identifies regimes of high and low strain rate sensitivity as a function of strain rate and temperature. The changes in material structure with deformation have been characterized in terms of isotropic and kinematic state variables. The evolution of the state variables are systematically determined from experiments. The proposed model exhibits capabilities to predict stress hardening, cyclic hardening, strain rate sensitivity, material aging and recovery effects and thermo-mechanical material response.
|Original language||English (US)|
|Number of pages||9|
|Journal||American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP|
|State||Published - Jan 1 1987|
ASJC Scopus subject areas
- Mechanical Engineering