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Strain-rate and strain-rate-history effects in several metals in torsion

Experimental results are presented for constant-strain-rate tests from 10−4 to 25/sec and for dynamic tests on quasi-statically prestressed specimens

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Abstract

A machine for testing thin-walled tubes in torsion at shear-strain rates up to 25/sec is described. Results of constant and variable-strain-rate tests are presented for 1100-0 aluminum, AISI 1020 steel, and 50-A titanium. Results indicate that 1100-0 aluminum is very slightly strain-rate sensitive, but steel and titanium are noticeably sensitive to both strain rate and strain-rate history. Variable-rate tests show that subsequent dynamic loading on a statically prestrained specimen causes an increase in the flow stress in steel and a decrease in the flow stress in titanium.

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Authors and Affiliations

  1. Strength and Dynamics Branch, Air Force Materials Laboratory, Wright-Patterson Air Force Base, 45433, Ohio

    Theodore Nicholas (Materials Research Engineer)

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  1. Theodore Nicholas
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This work was supported by the U. S. Air Force.

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Nicholas, T. Strain-rate and strain-rate-history effects in several metals in torsion. Experimental Mechanics 11, 370–374 (1971). https://doi.org/10.1007/BF02320539

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  • DOI: https://doi.org/10.1007/BF02320539

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