Recently Penny has extended the use of the continuum damage mechanics approach of Kachanov and Rabotnov to the extrapolation of shorter time creep rupture data to longer times. In this paper the authors review the methodology developed by Penny and have applied it using creep data for 9Cr-1Mo and 2.25Cr-1Mo steels that they have tested, as well as using data from the literature. The method appears to provide a reliable method of extrapolation from isothermal data, and can provide an economical and physically justified approach to the development of longer time creep-rupture data.

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