ADIABATIC SHEAR IN REMCO IRON AND QUENCHED AND TEMPERED 4340 STEEL

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Authors
  1. Mason, C.R.
  2. Worswick, M.J.
  3. Gallagher, P.J.
Corporate Authors
Defence Research Establishment Suffield, Ralston ALTA (CAN)
Abstract
Adiabatic shear localization is studied in two ferrous metals, Remco Iron, a high purity alpha iron, and 4340 steel, quenched and tempered at 650C. Punching-shear experiments are performed in a compressive split-Hopkinson bar producing shear strain rates of 45,000 s(1)-. Optical and scanning electron microsocpy was performed on the deformed shear specimens to determine the extent of shear localization and mode of failure. Experimental evidence showed that the 4340 steels were susceptible to localization through adiabatic shear banding, however, the Remco iron did not exhibit fine shear bands typical of localization. Finite elmeent simulations of the experiments were performed utilizing a suer material subroutine developed as part of this research. This constitutive routine incorporates two adiabatic shear failure criteria: (i) maximum shear stress and (ii) flow localization theory. These criteria proved to be capable of predicting the onset of an instability, however, the deformation which follows the instability was only moderately predicted well.
Keywords
Ferrous alloys;4340 steel
Date of publication
01 Aug 1997
Number of Pages
6
Reprinted from
J Phys IV France, vol 7, 1997, p C3-827-C3-832
DSTKIM No
98-00349
CANDIS No
507082
Format(s):
Hardcopy;Document Image stored on Optical Disk

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