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Shear-Banding Evolution Dynamics during High Temperature Compression of Martensitic Ti-6Al-4V Alloy
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The isothermal compression dynamics of ternary Ti-6 Al-4 V alloy with initial martensitic structures were investigated in the high temperature range 1083-1173 K and moderate strain rate regime 0.01-10 s-1.Shear banding was found to still dominate the deformation mechanism of this process,despite its nonadiabatic feature.The constitutive equation was derived with the aid of Zener-Hollomon parameter,which predicted the apparent activation energy as 534.39 kJ/mol.A combination of higher ... 相似文献
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双限制Tobit自回归GARCH模型和价格限制下股票日收益率模型估计 总被引:1,自引:0,他引:1
本文提出了一个在价格限制即涨跌停板制度存在的情况下,股票日收益率可能遵循的时间序列模型一双限制Tobit自回归GARCH模型,建立了此模型的最大似然估计法(MLE),用Monte Carlo实验研究了最大似然估计量性质.作为此模型应用,我们对一个上海股市的股票日收益率模型参数进行了估计。 相似文献
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