Dynamic small strain measurements of a metal specimen with a split Hopkinson pressure bar

When a conventional split Hopkinson pressure bar (SHPB) is used to investigate the dynamic flow behavior of ductile metals, the results at small strains (*e < ~ 2%) are not considered valid owing to fluctuations associated with the early portion of the reflected signal and the nonequilibrated str...

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Published in:Experimental mechanics 2003-03, Vol.43 (1), p.20-23
Main Authors: CHEN, W, SONG, B, FREW, D. J, FORRESTAL, M. J
Format: Article
Language:English
Subjects:
Applied sciences
Elasticity. Plasticity
Exact sciences and technology
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
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description When a conventional split Hopkinson pressure bar (SHPB) is used to investigate the dynamic flow behavior of ductile metals, the results at small strains (*e < ~ 2%) are not considered valid owing to fluctuations associated with the early portion of the reflected signal and the nonequilibrated stress state in the specimen. When small-strain behavior is important, such as in the case of determining the elastic behavior of materials, the accuracy of a conventional SHPB is not acceptable. Using a pulse-shaping technique, the dynamic elastic properties can be determined with a SHPB, as well as the dynamic plastic flow. We present a description of the experimental technique and the experimental results for a mild steel. The dynamic compressive stress-strain curve is composed of a lower strain-rate elastic portion and a high strain-rate plastic flow portion.
doi_str_mv 10.1007/BF02410479
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subjects Applied sciences
Elasticity. Plasticity
Exact sciences and technology
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
title Dynamic small strain measurements of a metal specimen with a split Hopkinson pressure bar
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