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| 1 | Hot deformation behavior of Mg-7.22Gd-4.84Y-1.26Nd-0.58Zr magnesium alloy显示文摘The behavior evolvement of Mg-7.22Gd-4.84Y-1.26Nd-0.58Zr(GWN751K) magnesium alloy during the hot deformation process was discussed.The flow stress behavior of the magnesium alloy over the strain rate range of 0.002 to 2.000 s-1 and in the temperature range of 623 to 773 K was studied on a Gleeble-1500D hot simulator under the maximum deformation degree of 60%.The experimental results showed that the relationship between stress and strain was obviously affected by strain rate and deformation temperature.The flow stress of GWN751K magnesium alloy during high temperature deformation could be represented by the Zener-Hollomon parameter in the hyperbolic Arrhenius-type equation.The stress exponent n and deformation activation energy Q were evaluated by linear regression analysis.The stress exponent n was fitted to be 3.16.The hot deformation activation energy of the alloy during hot deformation was 230.03 kJ/mol.The microstructures of hot deformation were also influenced by strain rate and compression temperature strongly.It was found that the alloy could be extruded at 723 K with the mechanical properties of σ0.2 = 260 MPa,σb = 320 MPa,and δ = 18%. | ZHANG Kui MA Minglong LI Xinggang LI Yongjun LIANG Lichao BING Mengfen | 2011 | Rare Metals2011，30，1： | 13 |
| 2 | Analysis and Simulation of Evolution Induced Catastrophe显示文摘A model of evolution induced catastrophe(EIC)characterized by a nonlocal interaction is proposed.The general feature of the model is its two bias states:explosively catastrophic and globally stable,both consisting in a cascade of locally unstable states.A one-dimensional analysis reveals a transition region from globally stable to catastrophe.A two-dimensional simulation gives a thin fractal fracture profile similar to that observed and also a possible spectrum of fracture fractal.All these are different from percolation.Hence,the EIC model may represent a prototype of natural processes. | BAI Yilong XIA Mengfen KE Fujiu LU Chunsheng LING Zhong | 1993 | Chinese Physics Letters1993，10，3： | 5 |
| 3 | Uncertainty and universality in the power-law singularity as a precursor of catastrophic rupture显示文摘The prediction of catastrophic rupture of heterogeneous brittle material has been investigated by researchers in the past.In this work,the acoustic emission generated by marble samples under compression was analyzed to verify a power law singularity of index 1/2 as a catastrophe precursor.It is found that prior to catastrophe,the variation of the system response to the controlling parameter follows a power law of negative index,which proves the power law singularity as a common precursor of catastrophe.However,the power indexes vary with variables and samples.The uncertainty reflects sample specificity of an evolution induced catastrophe (EIC) process. | JIN Yuan XIA MengFen WANG HaiYing | 2012 | Science China(Physics,Mechanics & Astronomy)2012，55，6： | 2 |
| 4 | Co-seismic energy release and relevant region of Tohoku M9.0 earthquake显示文摘'Off the Pacific coast of Tohoku Earthquake' (M9.0,on March 11th,2011) is the greatest one in Japanese seismic record. The hypocenter is located 130 km ESE off the Pacific coast of Tohoku with the focal depth of 24 km. | LU MingFu LI Li XIA MengFen WANG HaiYing BAI YiLong1 | 2011 | Science China Earth Sciences2011，54，7： | 2 |
| 5 | Critical Sensitivity in Driven Nonlinear Threshold Systems显示文摘 | Xiaohui Zhang Xianghong Xu Haiyin Wang Mengfen Xia Fujiu Ke Yilong Bai | 2004 | Pure and Applied Geophysics (-)2004，，9： | 1 |
| 6 | Molecular/cluster statistical thermodynamics methods to simulate quasi-static deformations at finite temperature显示文摘 | Haiying Wang Ming Hu Mengfen Xia Fujiu Ke Yilong Bai | 2008 | International Journal of Solids and Structures2008，，13： | 1 |
| 7 | Catastrophic rupture induced damage coalescence in heterogeneous brittle media 显示文摘 | Feng Rong Wang Haiying Xia Mengfen | 2006 | Pure and Applied Geophysics2006，163，： | 1 |
| 8 | Evolution induced catastrophe in a nonlinear dynamical model of material failure显示文摘 | Xia Mengfen Ke Fujiu Wei Yujie Bai Jie Bai Yilong | 2000 | Nonlinear Dynamics2000，22，： | 1 |
| 9 | SELF-ADAPTIVE MOLECULE/CLUSTER STATISTICAL THERMODYNAMICS METHOD FOR QUASI-STATIC DEFORMATION AT FINITE TEMPERATURE显示文摘Hybrid molecule/cluster statistical thermodynamics (HMCST) method is an efficient tool to simulate nano-scale systems under quasi-static loading at finite temperature.In this paper,a self-adaptive algorithm is developed for this method.Explicit refinement criterion based on the gradient of slip shear deformation and a switching criterion based on generalized Einstein approximation is proposed respectively.Results show that this self-adaptive method can accurately find clusters to be refined or transferred to molecules,and efficiently refine or transfer the clusters.Furthermore,compared with fully atomistic simulation,the high computational efficiency of the self-adaptive method appears very attractive. | Hao Tan Haiying Wang Mengfen Xia Fujiu Ke Yilong Bai | 2011 | Acta Mechanica Solida Sinica2011，24，1： | 1 |
| 10 | Statistical mesomechanics of solid, linking coupled multiple space and time scales 显示文摘 | Bai Yilong Wang Haiying Xia Mengfen Ke Fujiu | 2005 | Applied Mechanics Review2005，157，： | 1 |
| 11 | MECHANISMS UNDERLYING TWO KINDS OF SURFACE EFFECTS ON ELASTIC CONSTANTS显示文摘Recently,people are confused with two opposite variations of elastic modulus with decreasing size of nano scale sample:elastic modulus either decreases or increases with decreasing sample size.In this paper,based on intermolecular potentials and a one dimensional model,we provide a unified understanding of the two opposite size effects.Firstly,we analyzed the microstructural variation near the surface of an fcc nanofilm based on the Lennard-Jones potential.It is found that the atomic lattice near the surface becomes looser in comparison with the bulk,indicating that atoms in the bulk are located at the balance of repulsive forces,and the elastic moduli decrease with the decreasing thickness of the film accordingly.In addition,the decrease in moduli should be attributed to both the looser surface layer and smaller coordination number of surface atoms.Furthermore,it is found that both looser and tighter lattice near the surface can appear for a general pair potential and the governing mechanism should be attributed to the surplus of the nearest force to all other long range interactions in the pair potential.Surprisingly,the surplus can be simply expressed by a sum of the long range interactions and the sum being positive or negative determines the looser or tighter lattice near surface respectively.To justify this concept,we examined ZnO in terms of Buckingham potential with long range Coulomb interactions.It is found that compared to its bulk lattice,the ZnO lattice near the surface becomes tighter,indicating the atoms in the bulk are located at the balance of attractive forces,owing to the long range Coulomb interaction.Correspondingly,the elastic modulus of one-dimensional ZnO chain increases with decreasing size.Finally,a kind of many-body potential for Cu was examined.In this case,the surface layer becomes tighter than the bulk and the modulus increases with deceasing size,owing to the long range repulsive pair interaction,as well as the cohesive many-body interaction caused by the electron redistribution. | Yizhe Tang Zhijun Zheng Mengfen Xia Yilong Bai | 2009 | Acta Mechanica Solida Sinica2009，22，6： | 1 |
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