Abstract
Using a correlation between local yielding and a multiaxial strength-to-stiffness parameter, the continuum-scale yield surface for a polyphase, polycrystalline solid is predicted. The predicted surface explicitly accounts for microstructure through the quantification of strength-to-stiffness based on a finite element model of a crystal-scale sample. The multiaxial strength-to-stiffness is evaluated from the elastic response of the sample and the restricted slip, single crystal yield surface. Macroscopic yielding is defined by the propagation of a yield band through the sample and is detected with the aid of a flood-fill algorithm. The methodology is demonstrated with the evaluation of a plane-stress yield surface for a dual-phase super-austenitic stainless steel.
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Notes
The relations are written in the current configuration for simplicity. Readers are referred to Reference 4 for more complete exposition of the associated deformation kinematics.
The viscoplastic character of the equations for slip allows some level of plastic flow at any non-zero stress. However, the non-linearity of the relation implies that for stress levels below the strength the rates are small.
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Support was provided by the US Office of Naval Research (ONR) under contract N00014-09-1-0447.
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Manuscript submitted June 9, 2018.
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Poshadel, A.C., Dawson, P.R. A Methodology to Evaluate Continuum-Scale Yield Surfaces Based on the Spatial Distributions of Yielding at the Crystal Scale. Metall Mater Trans A 50, 2640–2654 (2019). https://doi.org/10.1007/s11661-019-05187-z
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DOI: https://doi.org/10.1007/s11661-019-05187-z