Effect of Specimen Diameter in Compression at High Strain Rates
Publication: Journal of Engineering Mechanics
Volume 137, Issue 3
Abstract
The split Hopkinson pressure bar (SHPB) is one of the most widely used experimental techniques to study the behavior of materials at medium to high strain rates. This paper deals with the use of the SHPB to investigate the effect of the specimen diameter on the mechanical properties of materials. Specimens made of aluminum alloy 6061-T6, with length 5 mm and varying diameters of 5, 6, 8, 10, and 12 mm, are tested. For same strain rate, higher stresses are observed for the smaller-diameter specimens. The smaller-diameter specimens give rise to higher and more uniform strain rates but oscillating stress-strain curves. They result in a low transmission coefficient that affects the output signals; therefore, smaller diameters should be selected carefully with the transmission coefficient of 0.5 or better. With some compromise on oscillating stress-strain behavior, the specimens with smaller diameters can be used successfully to achieve high strain rates.
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Published In
Journal of Engineering Mechanics
Volume 137 • Issue 3 • March 2011
Pages: 169 - 174
Copyright
© 2011 American Society of Civil Engineers.
History
Received: Apr 15, 2009
Accepted: Aug 25, 2010
Published online: Aug 31, 2010
Published in print: Mar 1, 2011
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