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Duan Z P, of Institute of Mechanics, Chinese Academy of Sciences, for the helpful discussions.
Wu: Axisymmetric Penetration of RHA steel targets by cylindrical tubes, Proceedings of the 1995 International Conference on Metallurgical and Materials Applications of Shock-Wave and High-Strain-Rate Phenomena, 1995, 337-344
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International Journal of Impact Engineering, 2003, 29: 69-80

A Study on the Phenomenological Constitutive Model of Mg-12Gd-5Y-3Zn-0.6Zr Magnesium Alloy Forming at Elevated Temperature Guang Lu 1, a, Zhimin Zhang 1,b , Yong Xue1,c , Baocheng Li1,d 1 North University of China, School of Material Science and Engineering, 030051 Taiyuan, China, axzp135464@sina.com, bforgexzp@163.com, cforgezzm@sina.com, d forgexy@sina.com Keywords: Mg-Gd-Y-Zn-Zr magnesium alloy, constitutive model, processing map, dynamic recrystallization, strain softening Abstract.
Magnesium alloy is the lightest mental material available for industrial application now, and has many good mechanical properties, such as high specific strength, excellent performance on vibration damping and electromagnetic shielding, and high specific stiffness, etc.
Experimental materials and methods Mg-12wt%Gd-5wt%Y-3wt%Zn-0.6wt%Zr alloy ingots are adopted as the materials for experiment.
Acknowledgements The present research is supported by the Natural Science Foundation of Shanxi Province, China (Grant No.2013011022-5, 2012011022-2), and Natural Science Foundation of North University of China.
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The interaction of ratcheting and fatigue damage involves the effects of mean stress, stress amplitude and cyclic softening/hardening response of materials.
Goswami model defined the dynamic viscosity to flow behavior of materials because of the mean stress/strain; nevertheless, the mean ratcheting strain rate could characteristic the flow behavior better than the strain rate.
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All kinds of complex solid and fluid models were widely used to describe rheological properties of the material such as the asphaltic sand [7-9], asphalt mixtures [10] and rock [11] in recent years, but the researches were relatively rare on using to describe the rheological characteristics of the solid propellant materials.
Materials and Methods The double-base propellant main raw materials include: Nitrocellulose (NC, 56%), Nitroglycerin (NG, 26.7%),Dinitrotoluene(DNT,11.3%),the others (6%).Test specimens were taken from the double-base propellant grain.
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Compared to the original method, the new method provides more detail movement information of different materials (aggregates and asphalt binder).
But in most of these researches, the asphalt mixtures are taken as homogeneous materials.
Compared to the original method, the new method provides more detail movement information of different materials (aggregates and asphalt binder).
Reference [1] Liping Guo, Wei Sun and Carpinter A: Fatigue & Fracture of Engineering Materials & Structures Vol. 31 (2008), p. 29-37
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Another advantage of porous materials over compact metals is the smaller elastic modulus.
The predominate materials are soft and adipose tissue (Fig. 4 B).
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Paper is chemically and physically processed composite materials derived from vascular and structural tissue of higher plants.
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