Abstract
A new finite \(J_2-\)flow rate-dependent elastoplastic model is proposed toward directly simulating cyclic and non-cyclic fatigue failure behavior of metals. Novel results in four respects are presented: (1) the concept of yielding is rendered irrelevant with smooth transitions to both the plastic state and the rate-independent case; (2) asymptotic loss of the strength is incorporated as inherent constitutive feature; (3) the failure behavior may accordingly be derived as a direct consequence of the proposed model, without involving any additional failure criteria and any additional variables; and (4) direct and explicit procedures are established for identifying each rate-dependent parameter based on suitable test data. Numerical examples are provided for various uniaxial loading cases up to failure, including monotone and cyclic strain cases from low to high strain rates and cyclic loading cases as well as non-cyclic loading cases with either variable stress amplitudes or variable strain rates. Model predictions compare well with test data.
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Wang, SY., Zhan, L., Wang, ZL. et al. A direct approach toward simulating cyclic and non-cyclic fatigue failure of metals. Acta Mech 228, 4325–4339 (2017). https://doi.org/10.1007/s00707-017-1940-2
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DOI: https://doi.org/10.1007/s00707-017-1940-2