Creep constitutive modeling of an aluminum alloy under multiaxial and cyclic loading (Q1357278)

A constitutive model is developed to characterize creep response of polycrystalline metals. The model is based on the effective stress concept, and back stress is utilized as an internal variable. A memory aspect is incorporated in the model to account for the previous maximal stress as a result of dislocation related micromechanisms. The model is used to predict the creep potential of an aluminum alloy under multiaxial and cyclic loading, and the predicted results are compared with the available experimental results on an aluminum alloy (2618-T61).