Shear localization in a tungsten heavy alloy
Technical Report
·
OSTI ID:147365
This paper presents the results of an investigation into the dynamic shearing deformations of a W-Ni-Fe heavy alloy containing 91% W and with the Ni and Fe in a 7:3 ratio. The techniques used to develop the dynamic shearing deformations are the torsional Kolsky bar and pressure shear plate impact. The torsional Kolsky bar generates shear rates up to 10(exp 3)/s for times of several hundred micro s. The pressure-shear plate impact technique subjects the deformed material to shearing under superimposed hydrostatic pressure and develops shear rates as high as 1O(exp 5)/s for times of one microsec. Adiabatic shear localization has been observed in the high-rate shearing tests; relatively narrow shear bands are formed, followed immediately by catastrophic fracture. The deformed microstructures are examined using scanning electron microscopy, optical microscopy, and quantitative image analysis of micrographs. Examination of the deformed microstructures supplies new insight into the mechanisms through which large dynamic shearing deformations occur in this heavy tungsten alloy.
- Research Organization:
- Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Mechanical Engineering
- OSTI ID:
- 147365
- Report Number(s):
- AD-A--296068/0/XAB; CNN: Contract DAAL03-91-G-0079
- Country of Publication:
- United States
- Language:
- English
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