Yield strength of molybdenum, tantalum and tungsten at high strain rates and very high temperatures
Yield strength of molybdenum, tantalum and tungsten at high strain rates and very high temperatures
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DOI：
10.1016/j.jnucmat.2012.03.044
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发表时间：
2012-07-01
影响因子：
3.1
通讯作者：
Booth, C. N.
中科院分区：
文献类型：
--
作者：
Skoro, G. P.;Bennett, J. R. J.;Booth, C. N.
沿着分析了最近报道的钽和钨屈服强度的高应变率、高温测量结果以及钼屈服强度的新实验结果。通过使短、快、高电流脉冲通过细导线，细导线受到高应力;电流的幅度决定应力，脉冲的重复频率决定导线的温度。在实验中达到的最高温度是2100摄氏度（钼），2250摄氏度（钽）和2450摄氏度（钨）。试验中的应变速率范围为500 ~ 1500 s（-1）。由Zerilli和Armstrong开发的本构方程的参数已被确定从实验数据和结果进行了比较，在较低的温度下获得的数据。对于钨的变形，获得了非常好的拟合。(C)2012爱思唯尔有限公司版权所有。
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 degrees C (for molybdenum), 2250 degrees C (for tantalum) and 2450 degrees 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. (C) 2012 Elsevier B.V. All rights reserved.