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Yield strength of molybdenum, tantalum and tungsten at high strain rates and very high temperatures

Škoro, G.P., Bennett, J.R.J., Edgecock, R. and Booth, C.N. (2012) Yield strength of molybdenum, tantalum and tungsten at high strain rates and very high temperatures. Journal of Nuclear Materials, 426 (1-3). pp. 45-51. ISSN 0022-3115

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Abstract

Recently reported results of the high strain rate, high temperature measurements of the yield strength of tantalum and tungsten have been analyzed along with new experimental results on the yield strength of molybdenum. Thin wires are subjected to high stress by passing a short, fast, high current pulse through a thin wire; the amplitude of the current governs the stress and the repetition rate of the pulses determines the temperature of the wire. The highest temperatures reached in the experiments were 2100 °C (for molybdenum), 2250 °C (for tantalum) and 2450 °C (for tungsten). The strain-rates in the tests were in the range from 500 to 1500 s−1. The parameters for the constitutive equation developed by Zerilli and Armstrong have been determined from the experimental data and the results have been compared with the data obtained at lower temperatures. An exceptionally good fit is obtained for the deformation of tungsten.

Item Type: Article
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Schools: School of Applied Sciences
Depositing User: Sharon Beastall
Date Deposited: 03 Oct 2012 09:16
Last Modified: 03 Oct 2012 09:16
URI: http://eprints.hud.ac.uk/id/eprint/15268

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