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This paper addresses instability and localization of plastic shear at different imposed rates. A wide range of the nominal strain rates in shear has been studied numerically, from 50 s-~ to 105 s -~. A layer with a small geometrical defect is assumed, which dimensions are exactly the same as in the double shear specimen used in impact loading (Klepaczko. 1994). A one-dimensional model for simple shear deformation was applied together with the complete constitutive relations based on structural evolution and dislocation kinetics. The constitutive modelling based on dislocation dynamics is limited to BCC structures, more exactly to mild carbon steels. The complete thermal coupling of plastic deformation was taken into account with exact Debye model for the specific heat, as well the thermal conductivity was accounted for in the numerical analyses. All material constants in the constitutive relations have been found and numerical analyses have been performed for XCI8 steel (similar to 1018 steel of AISI). The complete analysis of this numerical study is given elsewhere (Rezaig, 1994). It has been found that the critical nominal strain rate exists at which the formation of the adiabati

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Author

J.R. Klepaczko; B. Rezaig

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0167-6636)

Published

1996

Language

EN

Field

Engineering (Physical Sciences)