Creep–fatigue tests were carried out on Jethete M152 at 550°C under mode I, mode II, and mixed mode ( K 1 / K II ≈ 1.6) conditions. The results were correlated and compared with corresponding fatigue and creep data. The results indicated that damage due to creep caused a larger increase in fatigue crack growth rate than a simple superposition model would predict. Also creep appeared to have a more dominant influence than fatigue on crack growth direction.
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Hyde et al. (1992) studied this question.