CHARACTERIZATION OF HIGH TEMPERATURE CREEP CRACK GROWTH RATE IN TERMS OF INDEPENDENT PARAMETERS.

For characterizing creep crack growth rate behaviour at high temperatures, several parametric methods have been proposed. On the other hand, the authors have proposed the representation by the Q parameter of crack growth rate in terms of independent variables including applied gross stress sigma //g, K and temperature in explicitly analytical form. In the present paper the comparison has been made of the representation by the Q parameter with that by the other parametric methods. Furthermore, by analysing the data in literatures including our previous data, the Q* parameter was proposed as an extension of the Q parameter.