Abstract
Identification of the evolution of the damage variable, D, in continuum creep damage theory was developed directly from the metallographical A-parameter. As the observed fraction of cavitated grain boundaries on the observation plane, A-parameter was first related to the cavity area fraction on the grain boundary facet planes by perform ing a probability analysis. Then, two specific A-D relations were obtained corresponding to the instantaneous and continuous nucleation of cavities, respectively. An A-D relation of more generality was also derived from one of the proposed A-D relations by using the Kachanov-Rabotnov creep damage theory. Finally, the creep damage behavior of a practi cal alloy was identified from A-parameter by using the developed A-D relations in addition to the previous one. Some comparisons and discussions were made based on the test results of this alloy.
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