MODELING OF HIGH HOMOLOGOUS TEMPERATURE DEFORMATION-BEHAVIOR USING THE VISCOPLASTICITY THEORY-BASED ON OVERSTRESS (VBO) .2. CHARACTERISTICSOF THE VBO MODEL

Characteristics of the high homologous temperature VBO model under ext reme conditions such as very fast and very slow tensile tests, long-te rm-creep and relaxation rests are investigated via numerical experimen ts and analysis. To this end, material constants of Alloy 800H determi ned from other tests in Part I were utilized for the prediction. Altho ugh no experiments are available for the extreme conditions, the predi ctions are plausible. For cyclic, strain controlled hold-time tests th e predictions compare well with sparse experimental data. The results give confidence that VBO can be used to predict the long-term behavior at high homologous temperature once the constants have been determine d from regular short-term tests.