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Some Physical Characteristics of Strain Hardening in Severe Plastic Deformation
Author(s) -
Beygelzimer Yan,
Toth Laszlo S.,
Jonas John J.
Publication year - 2015
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.201500097
Subject(s) - materials science , simple shear , von mises yield criterion , plasticity , strain hardening exponent , work hardening , hardening (computing) , shear (geology) , stress path , mechanics , microstructure , composite material , structural engineering , finite element method , physics , engineering , layer (electronics)
It is shown here using group theory principles that the Hencky strain is not an appropriate measure for tests involving simple shear, for which the von Mises formulation should be used exclusively. It is also shown analytically that the application of self‐similarity principles to Stages III–IV indicates that these obey power laws, while the same principles do not apply to the other stages. As a result, they do not develop self‐similar microstructures. Finally, the effect of strain path on the work hardening rates themselves is also examined. It is shown that the lowest rates are again associated with simple shear because this is the path along which the number of intersecting slip systems is the lowest.