The difficulties involved in the accurate measurement of the flow stress of materials at high rates of deformation are reviewed, and methods of overcoming these difficulties are discussed. It is concluded that the best experimental method is that in which a split Hopkinson bar is adapted for torsion testing, and the loading pulse is approximately square in shape and has a relatively short duration. A description is given of apparatus which was developed to achieve this type of loading, the input wave being generated explosively. This wave was found to contain large amplitude fluctuations, and to eliminate these a mechanical “pulse smoother” was used. The operation of this device is described, and the test procedure, method of calibration, and possible sources of inaccuracy are discussed. Results are presented for 1100-0 aluminum alloy deformed at strain rates of the order of 800 sec−1 and are compared with those obtained at a nominal strain rate of 10−4 sec−1; the results are also compared with those obtained in compressive tests by other workers.
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March 1971
Research Papers
On the Use of a Torsional Split Hopkinson Bar to Study Rate Effects in 1100-0 Aluminum
J. Duffy,
J. Duffy
Brown University, Division of Engineering, Providence, R. I.
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J. D. Campbell,
J. D. Campbell
Brown University, Division of Engineering, Providence, R. I.
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R. H. Hawley
R. H. Hawley
Brown University, Division of Engineering, Providence, R. I.
Search for other works by this author on:
J. Duffy
Brown University, Division of Engineering, Providence, R. I.
J. D. Campbell
Brown University, Division of Engineering, Providence, R. I.
R. H. Hawley
Brown University, Division of Engineering, Providence, R. I.
J. Appl. Mech. Mar 1971, 38(1): 83-91 (9 pages)
Published Online: March 1, 1971
Article history
Received:
December 31, 1969
Revised:
May 4, 1970
Online:
July 12, 2010
Citation
Duffy, J., Campbell, J. D., and Hawley, R. H. (March 1, 1971). "On the Use of a Torsional Split Hopkinson Bar to Study Rate Effects in 1100-0 Aluminum." ASME. J. Appl. Mech. March 1971; 38(1): 83–91. https://doi.org/10.1115/1.3408771
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