THE STRAIN RATE SENSITIVITY OF $alpha$-URANIUM

Journal Article · Sun Mar 01 04:00:00 EST 1959 · J. Mech. and Phys. Solids

DOI:https://doi.org/10.1016/0022-5096(59)90015-8· OSTI ID:4264573

Maiden, C J

Experiments are described in which specimens from two different batches of uranium were subjected to both static and dynamic compression tests. From such tests static and dynamic stress-strain curves were obtained. These stress- strain curves indicate that alpha -uranium is slightly strain-rate sensitive; for instance, the effect of increasing the strain rate from 2.5 x 10/sup -3//sec to several hundred per sec was to raise the stress, at any strain less than about 4 per cent, by approxiniately 10 per cent. After about 4 per cent strain the strain-rate sensitivity was found to decrease with increased defornmation. In order to determine the variation in dynamic strength of alpha -uranium with test temperature, as-cast specimens from the first batch of uranium were tested dynamically at -41 and -84 C. The results obtained indicate that the rate of increase of strength with decreasing temperature is small, the effect of lowering the test temperature to -84 C being to raise the dynamic stress-strain curve corresponding to given test conditions by only about 5 per cent. Also, to determine the effect of grain size on the dynamic strength of uranium, tests were made on the first batch of uranium in the 6 wt.% Ru-U all -quenched state. It was found that, for identical test conditions, the derived dynamic stress-strain curve for the 6 wt.% Ru-U all -quenched material was approximately 10 per cent higher than for the ascast material. The second batch of uranium was also tested dynamically in the 300 C rolled condition. The results of such tests indicate that the dynamic compressive strength of 300 C rolled uranium, in the direction of rolling, is slightiy greater than the dynamic compressive strength of alpha -uranium in the as-cast state. (auth)

• Research Organization: Univ. of Oxford
• NSA Number: NSA-13-013623
• OSTI ID: 4264573
• Journal Information: J. Mech. and Phys. Solids, Journal Name: J. Mech. and Phys. Solids Vol. Vol: 7
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ALLOTROPY
ANISOTROPY
DEFORMATION
DIAGRAMS
GRAIN SIZE
HEAT TREATMENTS
LOW TEMPERATURE
METALLURGY AND CERAMICS
PRESSURE
ROLLING
STRESSES
TENSILE PROPERTIES
URANIUM
URANIUM-ALPHA
URANIUM-BETA