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Effects of High Strain Rate and Self-heating on Plastic Deformation of Metal Materials Under Fast Compression Loading

  • S.I. : Temperature dependence of material behaviour at high strain-rate
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Abstract

The results of dynamic tests for compression of four metals after annealing (aluminum alloy, copper, brass, stainless steel) in the range of strain rates 100–10,000 s–1 are presented. To obtain dynamic true stress-true plastic strain curves a specific dynamic upsetting computation method was used starting from time variation of force pulse. The high-speed loading of specimens with a height to diameter ratio equal to 1.5 was carried out using three experimental devices: a drop-hammer with a free-falling mass, a ram impact machine with rubber accelerators and an impact machine with powder acceleration. A technique for direct measuring the specimen temperature during plastic deformation using an “artificial specimen” thermocouple (specimen-thermocouple) was proposed, in which the deformable metal itself is the “hot” junction, while the “cold” junction is connected to the measuring instrument. A thermoelectrode made of an alloy of noble metals tungsten and rhenium with a diameter of 0.1 mm was welded to the specimen by radiation from a pulsed YAG:Nd3+ laser. As a result of the tests, true dynamic stress–strain diagrams and flow stress versus strain rate were obtained. Experimental estimation concerning self-heating temperature variation corresponding to high-speed plastic deformation at room temperature is also developed. Experiments for determining the temperature effect of plastic deformation of the samples after annealing during cold settling showed that at the high speed of ~ 50 m s−1 and high strain-rates of ~ 10,000 s−1 the increase in temperature of the specimens compressed to a degree of deformation of 0.6 reached 55 °C for an aluminum alloy, 60 °C for copper, 80 °C for brass and 140 °C for stainless steel.

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Acknowledgements

The dynamic experiments were supported by the grant of the Government of the Russian Federation (Contract No. 14.Y26.31.0031). The temperature effect of plastic deformation was investigated under partial financial support from the Russian Science Foundation (Grant 16–19-10237-P).

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Authors and Affiliations

  1. Research Institute for Mechanics, Lobachevsky State University, Nizhny Novgorod, Russia

    A. Bragov, L. Igumnov, A. Konstantinov & A. Lomunov

  2. Institute of Mechanical Engineering Problems, RAS, Nizhny Novgorod, Russia

    E. Rusin

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  1. A. Bragov
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  2. L. Igumnov
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  3. A. Konstantinov
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  4. A. Lomunov
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  5. E. Rusin
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Correspondence to A. Bragov.

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Bragov, A., Igumnov, L., Konstantinov, A. et al. Effects of High Strain Rate and Self-heating on Plastic Deformation of Metal Materials Under Fast Compression Loading. J. dynamic behavior mater. 5, 309–319 (2019). https://doi.org/10.1007/s40870-019-00214-x

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  • DOI: https://doi.org/10.1007/s40870-019-00214-x

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