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

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 d...

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Bibliographic Details
Published in:International journal of plasticity 1996, Vol.12 (6), p.761-780
Main Authors: Faruque, M.O., Zaman, M., Hossain, M.I.
Format: Article
Language:English
Subjects:
Applied sciences
Creep
Exact sciences and technology
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
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Summary: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. The predicted results are compared with the available experimental results on an aluminum alloy (2618-T61). The associated six basic model parameters are evaluated by using an optimization technique, called ‘Box Algorithm’. These model parameters are then used to predict some unoptimized experimental data sets. The influence of multiaxial and cyclic loadings is investigated in detail for the selected aluminum alloy. Overall, excellent correlations are observed.
ISSN:0749-6419
1879-2154
DOI:10.1016/S0749-6419(96)00028-9