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Simulation of the cyclic stress-strain behavior of the magnesium alloy AZ31B-F under multiaxial loading
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Advisor(s)
Abstract(s)
Under strain control tests and cyclic loading, extruded magnesium alloys exhibit a special mechanism of plastic deformation ("twinning" and "de-twining"). As a result, magnesium alloys exhibit an asymmetric material behavior that cannot be fully characterized with the typical numerical tools used for steels or aluminum alloys. In this sense, a new phenomenological model, called hypo-strain, has been developed to correctly predict the cyclic stress-strain evolution of magnesium alloys. On this basis, this work aims to accurately describe the local cyclic elastic-plastic behavior of AZ31B-F magnesium alloy under multiaxial cyclic loading with Abaqus incremental plasticity. The phenomenological hypo-strain model was implemented in the UMAT subroutine of Abaqus/Standard to be used as a design tool for mechanical design. To evaluate this phenomenological approach, the results were correlated with the uniaxial and multiaxial proportional and non-proportional experimental tests. In addition, the estimates were also correlated with the Armstrong-Frederick nonlinear kinematic hardening model. The results show a good correlation between the experiments and the phenomenological hypo strain approach. The model and its implementation were validated in the strain range studied.
Description
Keywords
AZ31B-F Magnesium alloys Multiaxial loading Simulation Cyclic stress-strain behavior
Pedagogical Context
Citation
Anes, V., Moreira, R., Reis, L., & Freitas, M. (2023). Simulation of the cyclic stress-strain behavior of the magnesium alloy AZ31B-F under multiaxial loading. Crystals, 13(6), 1-21. https://doi.org/10.3390/cryst13060969
Publisher
MDPI