Plastic instability and flow localization in shear at high rates of deformation

Journal Article · Sat Sep 01 04:00:00 EDT 1984 · Acta Metall.; (United States)

DOI:https://doi.org/10.1016/0001-6160(84)90080-4· OSTI ID:6069437

Semiatin, S L; Jonas, J J; Staker, M R

The occurrence of adiabatic shear bands in metals is analyzed using models based on load instability and flow localization. In the former shear strain concentration is identified with the occurrence of a maximum in the shear stress-shear strain curve. The latter model treats localization as a process which begins to develop at a material imperfection at the onset of deformation. In both cases, the flow softening arising from adiabatic heating is taken to be the driving force behind the process. The predictive capabilities of the two models are compared using data on shear band formation during the explosive expansion of 4340 steel cylinders. The flow localization model forecasts the occurrence of adiabatic shear bands more accurately and is thus more useful for the prediction of nonuniform flow at high rates of strain such as those which occur during impact loading and metalcutting.

• Research Organization: Battelle's Columbus Laboratories, Columbus, OH
• OSTI ID: 6069437
• Journal Information: Acta Metall.; (United States), Journal Name: Acta Metall.; (United States) Vol. 32:9; ISSN AMETA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ADIABATIC PROCESSES
ALLOYS
DEFORMATION
DYNAMIC LOADS
FLOW STRESS
FLUID FLOW
HEATING
INSTABILITY
IRON ALLOYS
IRON BASE ALLOYS
MATHEMATICAL MODELS
MECHANICAL PROPERTIES
PLASTICITY
RHEOLOGY
SHEAR
STEELS
STRAINS
STRESSES
TEMPERATURE EFFECTS