Constitutive Model Development for Alloy 617 Under High Temperature Multiaxial Loading

摘要

Experimental observations from a broad set of multiaxial experiments on Alloy 617 revealed that the creep-fatigue-ratcheting responses of Alloy 617 depends on temperature, strain rate, loading histories and strain amplitude. A unified constitutive model was developed which takes into account the strain rate and strain range dependence of the material. Moreover, additional features were incorporated in the model to accommodate loading non-proportionality and multiaxial ratcheting phenomena. Simulations of the experimental responses using the developed UCM revealed that the UCM can simulate the wide range of experimental observations very well.