Abstract
The formalism of continuum damage mechanics is utilised in a two state variable physically oriented description of creep behaviour in the single crystal nickel base superalloy SRR 99 crept at constant <001> uniaxial load and constant temperature in the 750–950°C range. The proposed set of coupled differential equations has an analytical solution, strain vs. time, for creep curves at constant temperature and stress. A personal computer programme has been produced to apply to constant load creep curves. The description fits excellently the examined data. In the stress-temperature field explored the regime of deformation seems to change continuously without abrupt change in the creep mechanisms.
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