Abstract
A unified anisotropic viscoplastic constitutive model for single-crystal superalloys is developed based on a modification of a phenomenological isotropic model. Orientation-dependent viscoplastic behaviour was observed in experiments. The model is used to simulate the orientation and cyclic mechanical response of single-crystal SRR99 under combined fatigue and creep conditions at 950 °C. The results from the simulations are then used to estimate the fatigue– creep lives of the single-crystal nickel-base superalloy SRR99 using a new life prediction methodology. The predicted fatigue–creep lives are in good agreement with the experimental results.
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