Creep–fatigue crack growth in Jethete M152 at 550°C under mixed mode conditions

Creep–fatigue tests were carried out on Jethete M152 at 550°C under mode I, mode II, and mixed mode ( K1/ KII ≈ 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.