A modification of the torsional split Hopkinson bar is described which superimposes a high rate of shear strain on a slower “static” rate. The static rate of 5 × 10−5 sec−1 is increased to 850 sec−1 at a predetermined value of plastic strain by the detonation of small explosive charges; the rise time of the strain-rate increment is about 10 microsec. During deformation at the dynamic rate, direct measurement is made of the excess stress above the maximum static stress attained. Results for 1100-O aluminum show that the initial response to the strain rate increment is elastic, followed by yielding behavior reminiscent in appearance to an upper yield point. The incremental stress-strain curve always lies beneath the stress-strain curve obtained entirely at the higher strain rate but approaches it asymptotically with increasing strain. It is concluded that the material behavior is a function of strain, strain rate, and strain rate history.
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December 1972
Research Papers
The Dynamic Stress-Strain Behavior in Torsion of 1100-0 Aluminum Subjected to a Sharp Increase in Strain Rate
R. A. Frantz, Jr.,
R. A. Frantz, Jr.
Division of Engineering, Brown University, Providence, R. I.
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J. Duffy
J. Duffy
Division of Engineering, Brown University, Providence, R. I.
Search for other works by this author on:
R. A. Frantz, Jr.
Division of Engineering, Brown University, Providence, R. I.
J. Duffy
Division of Engineering, Brown University, Providence, R. I.
J. Appl. Mech. Dec 1972, 39(4): 939-945 (7 pages)
Published Online: December 1, 1972
Article history
Received:
March 29, 1971
Revised:
July 13, 1971
Online:
July 12, 2010
Citation
Frantz, R. A., Jr., and Duffy, J. (December 1, 1972). "The Dynamic Stress-Strain Behavior in Torsion of 1100-0 Aluminum Subjected to a Sharp Increase in Strain Rate." ASME. J. Appl. Mech. December 1972; 39(4): 939–945. https://doi.org/10.1115/1.3422895
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