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Numerical Analysis of Skin Effect on Microplastic Flow of HPDC Mg Alloys
Summary
This finite element study models the skin effect on microplastic flow in high-pressure die-cast Mg-Al alloys, finding that internal constraint stresses require higher applied stress to initiate microplastic flow and that increasing Al content delays flow instability.
An axisymmetric finite element (FE) model is established to investigate how “skin effect” affects microplastic flow behavior of hpdc Mg–Al alloys. Due to internal interaction, initiation of microplastic flow requires an externally applied stress higher than microyield strength, while propagation can take place at external stresses lower than yield strength. Degree of internal interaction is quantified by characteristic constraint stress defined, which increases with progression of microplastic flow. Instability of microplastic flow occurs when characteristic constraint stress reaches a critical value, and an increase in Al content delays the occurrence of flow instability. In addition, the size of skin region has been well‐defined based on the present analysis.