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shear viscosity of aluminum studied by shock compression considering elasto-plastic effects

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Chinese Physics B 2014年第9期23卷 331-334页

作者：马小娟郝斌斌马海霞刘福生 Institute of High Temperature and High Pressure Physics Key Laboratory of Advanced Technologies of Materials of the Ministry of EducationSouthwest Jiaotong University

The strength always exists before the material melts. In this paper, the viscoelastic-plastic model is applied to improve the finite difference method, and the numerical solutions for the disturbance amplitude damping behavior of the sinusoidal shock front in a flyer-impact experiment are obtained. When the aluminum is shocked to 101 GPa, the effect of elasto-plasticity on the zero-amplitude point of the oscillatory damping curve is the same as that of viscosity when η= 700 Pa.s, and the real shear viscosity coefficient of the shocked aluminum is determined to be about 2800±100 Pa.s. Comparing the experiment data with the numerical results of the viscoelastic-plastic model, we find that the aluminum is close to melting at 101 GPa.

关键词： shock shear viscosity elastoplasticity

shear viscosity to Entropy Density Ratio in Au+Au Central Collisions

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Plasma Science and Technology 2012年第7期14卷 585-587页

作者：周铖龙马余刚方德清 Shanghai Institute of Applied Physics Chinese Academy of Sciences Graduate School of Chinese Academy of Sciences

The shear viscosity （7） and entropy density （s） are studied for the central Au＋Au collisions with the help of a microscopic transport model, namely the isospin-dependent quantum molecular dynamic model （IQMD）. Employ the formula given in Ref. [1],η is calculated as a time dependent variable for different incident energies from 40 MeV/u to 120 MeV/u and the energy dependence of η/s of nuclear matter in the most compressed stage in collision process is displayed.

关键词： shear viscosity entropy density heavy ion collision

shear viscosity of Hot QED at Finite Chemical Potential from Kubo Formula

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Communications in Theoretical Physics 2008年第8期50卷 429-436页

作者： LIU Hui HOU De-Fu LI Jia-Rong Department of Physics Jinan University Guangzhou 510632 China Institute of Particle Physics Central China Normal University Wuhan 430079 China

Within the framework of finite temperature field theory this paper discusses the shear viscosity of hot QED plasma through Kubo formula at one-loop skeleton diagram level with a finite chemical potential The effective widths (damping rates) are introduced to regulate the pinch singularities and then gives a reliable estimation of the shear viscous *** finite chemical potential contributes positively compared to the pure temperature case. The result agrees with that from the kinetics theory qualitatively.

关键词： shear viscosity QGP finite-temperature field theory chemical potential

Influence of Reverse Pressure on the shear viscosity of Hydrophilic Poly(ethylene terephthalate) Melt

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Chinese Journal of Polymer Science 2014年第7期32卷 923-930页

作者： Zeng-ge Guo Xin Li Jian Li Bin Zhang 程博闻 State Key Laboratory of Hollow Fiber Membrane Materials and Processes Tianjin Polytechnic University State Key Laboratory of Bio-based Fiber Manufacture Technology China Textile Academy

The effect of reverse *** theological behavior has been studied. The apparatus is a capillary rheometer with counter pressure chamber being held at a high reverse pressure by means of a cock. The results show that with the increase in temperature, the shear viscosity of hydrophilic PET is reduced. It is different that the effect of temperature on shear viscosity is varied under the condition of all shear rates or all pressures, and the effect is more prominent at 50 MPa or at 216 s^-1. At the same time, the pressure coefficients decrease with increasing the shear rate and the temperature and tend to reach a constant value nearly at the temperature of 290 ℃.

关键词： Hydrophilic PET shear viscosity Pressure Temperature shear rate Pressure coefficients.

Power law of shear viscosity in Einstein-Maxwell-Dilaton-Axion model

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Chinese Physics C 2017年第2期41卷 64-73页

作者：凌意冼卓宇周振华 Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Shanghai Key Laboratory of High Temperature Superconductors Shanghai 200444 China School of Physics University of Chinese Academy of Sciences Beijing 100049 China

We construct charged black hole solutions with hyperscaling violation in the infrared（IR） region in Einstein-Maxwell-Dilaton-Axion theory and investigate the temperature behavior of the ratio of holographic shear viscosity to the entropy density. When translational symmetry breaking is relevant in the IR, the power law of the ratio is verified numerically at low temperature T, namely, η/s ～ T^κ, where the values of exponent κ coincide with the analytical results. We also find that the exponent κ is not affected by irrelevant current, but is reduced by the relevant current.

关键词： shear viscosity gauge/gravity duality hyperscaling violation Einstein-Maxwell-Dilaton-Axion model breaking of translational invariance

Neighboring azimuthal bin-bin multiplicity correlation as a direct measure for the shear viscosity in relativistic heavy ion collisions

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Chinese Physics C 2013年第9期37卷 19-23页

作者：里霖王美娟吴元芳 Key Laboratory of Quark and Lepton Physics (MOE) and Institute of Particle Physics Central China Normal University Physics Department China University of Geoscience

Neighboring azimuthal bin-bin multiplicity correlation is suggested to be a good measure for internal layer-to-layer interactions of the formed matter in relativistic heavy ion collisions. It is shown to be directly related to the shear viscosity of the formed matter. As an application of this method, the shear viscosity in the samples generated by a multi-phase transport model （AMPT） is estimated. The results are in qualitative agreement with the theoretical calculation from microscopic interactions, i.e., the larger the scattering cross section, the smaller the shear viscosity.

关键词： neighboring azimuthal bin-bin multiplicity correlation shear viscosity relativistic heavy ion collision

Remarks on a Real Viscous Heat-conducting Flow with shear viscosity

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Chinese Quarterly Journal of Mathematics 2005年第1期20卷 85-89页

作者： ZHANGZhi-ping WANGXiu-qin DENGShu-xian CollegeofMathematicsandInformationSciences HenanUniversityKaifeng475001China DepartmentofMathematicsHenanTextileCollege Zhengzhou450001China

This paper is concerned with the global existence and exponential stability of solutions with large initial date in H^1 for real viscous heat-conducting flow with shear viscosity.

关键词： real viscous flow shear viscosity global existence

shear and bulk viscosity of high-temperature gluon plasma

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Chinese Physics C 2018年第6期42卷 59-66页

作者： Le Zhang De-Fu Hou Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics(MOE) Central China Normal UniversityWuhan 430079China The College of Post and Telecommunication Wuhan Institute of TechnologyWuhan 430070China

We calculate the shear viscosity（η） and bulk viscosity（ζ） to entropy density（s） ratios η/s and ζ/s of a gluon plasma system in kinetic theory, including both the elastic gg←→gg forward scattering and the inelastic soft gluon bremsstrahlung gg←→ggg processes. Due to the suppressed contribution to η and ζ in the gg←→gg forward scattering and the effective g←→gg gluon splitting, Arnold, Moore and Yaffe（AMY） and Arnold, Dogan and Moore（ADM） have got the leading order computations for η and ζ in high-temperature QCD matter. In this paper, we calculate the correction to η and ζ in the soft gluon bremsstrahlung gg←→ggg process with an analytic *** find that the contribution of the collision term from the gg←→ggg soft gluon bremsstrahlung process is just a small perturbation to the gg←→gg scattering process and that the correction is at～ 5% level. Then, we obtain the bulk viscosity of the gluon plasma for the number-changing process. Furthermore, our leading-order result for bulk viscosity is the formula ζ∝（αs^2 T^3）/（lnαs^-1） in high-temperature gluon plasma.

关键词： shear viscosity bulk viscosity entropy density high-temperature gluon plasma soft gluon bremsstrahlung

shear transformation zone dependence of creep behaviors of amorphous phase in a CuZr-based bulk metallic glass composite

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Science China(Technological Sciences) 2020年第8期63卷 1560-1565页

作者： JIANG SongShan GAN KeFu HUANG YongJiang XUE Peng SUN JianFei State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China School of Materials Science and Engineering Central South UniversityChangsha 410083China

The creep behaviors of the amorphous phase in a CuZr-based bulk metallic glass composite(BMGC)are studied by *** fabricated via higher cooling rates are found to exhibit more prominent creep,but a smaller shear *** volume of the shear transformation zones(STZs)in the amorphous phase calculated based on a cooperative shear model increases with the cooling *** evolution of excess free volume created during creep deformation is clarified.A looser atomic arrangement leads to a larger STZ volume,thus facilitating creep *** study gives a better understanding of the deformation behaviors of the amorphous phase in BMGCs.

关键词： bulk metallic glass composite amorphous phase cooling rate shear viscosity shear transformation zone free volume