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Numerical Analysis of Skin Effect on Microplastic Flow of HPDC Mg Alloys
Author(s) -
Zhang Bao
Publication year - 2016
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201600029
Subject(s) - materials science , flow (mathematics) , instability , finite element method , stress (linguistics) , flow stress , constraint (computer aided design) , yield (engineering) , metallurgy , mechanics , structural engineering , microstructure , mathematics , physics , engineering , geometry , linguistics , philosophy
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.