Abstract
The strain localization phenomenon of “adiabatic shear” is generally attributed to a plastic instability arising from a thermal softening effect during adiabatic or near-adiabatic plastic deformation. High strain-rate adiabatic torsion tests indicate that the effective shear stress-strain \((\bar \tau - \bar \gamma ) \) relations for high-strength (rate-insensitive) steels can be described by a simple expression of the form:
where \({{\bar \tau }_0}\) is a constant, α and β are dimensionless hardening and softening parameters. The flow stress reaches a maximum at an instability strain, \({{\bar \gamma }_i} = {\beta ^{ - 1}} - {\alpha ^{ - 1}}\). With parameters derived from the torsion tests, this relation has been used in computer simulations of the development of intense shear localization in a simple uniformly loaded body. Strain localization has been studied under conditions of both quasistatic and dynamic deformation. Application to the simulation of ballistic penetration is in progress.
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Olson, G.B., Mescall, J.F., Azrin, M. (1981). Adiabatic Deformation and Strain Localization. In: Meyers, M.A., Murr, L.E. (eds) Shock Waves and High-Strain-Rate Phenomena in Metals. Springer, Boston, MA. https://doi.org/10.1007/978-1-4613-3219-0_14
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DOI: https://doi.org/10.1007/978-1-4613-3219-0_14
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