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| 1 | Computer Aided Simulation on Precision Cold Forging of Universal Joint Cross显示文摘The 3D FEM numerical simulation on multi-action precision cold forging technology of universal joint cross and differential spider is done in this article using DEFORM Software, a commercial computer aided engineering software specializing in forming and heat treatment simulation technology, and suitable for cold, warm and hot forging process. The material flow properties, the dynamic variation of stress and strain in the process of deformation and the load-stroke curve have also been achieved. A good consistency is exhibited between simulation results and practical data. Based on the DEFORM simulation results, the optimized procedure has been found for forging a universal joint cross. What should be emphasized here is that a better understanding of practical forging characters and the environmental factors can greatly improve the simulation accuracy thus make the simulation results more reliable. | H. Liu, G.N Liu, K J Huo ,T Liu, X H Zhang, K Liu, K Tao, Y. J. Liu 1. Mechanical Engineering School, Xi’an Jiaotong University, Xi’an, 710049, China 2.Strength Centre, Zhengzhou Research Institute of Mechanical Engineering, Zhengzhou 450052, China 3.Fo | 2000 | Journal of Shanghai Jiaotong university(Science)2000，5，1： | 7 |
| 2 | An analytical solution for the elastic fields near spheroidal nano-inclusions显示文摘When the size of an inclusion shrinks to nanometers,interface energy plays an important role in the deformationaround it. In the present paper, we consider the effect ofinterface energy on the elastic fields near a spheroidal nano-inclusionembedded in an elastic medium on the basis of surfaceelasticity theory. Using Boussinesq-Sadowsky potentialfunction method, we obtain the deformation field near theinclusion subjected to a uniformly uniaxial loading at infinity.The results show that the elastic fields near the nano-inclu-siondepend strongly on the interface properties, the size andshape of inclusion. These new characteristics may be helpfulto understand various relevant mechanical performances ofnanosized inhomogeneities. | Z. Y. Ou G. F. Wang T. J. Wang Department of Engineering Mechanics,MOE Key Laboratory for Strength and Vibration,Xi’an Jiaotong University, Xi’an 710049, China | 2009 | Acta Mechanica Sinica2009，25，6： | 4 |
| 3 | IMPROVEMENT OF MECHANICAL PROPERTIES OF MARTENSITIC STAINLESS STEEL BY PLASMA NITRIDING AT LOW TEMPERATURE显示文摘一系列实验被执行在 AISI 420 马氏体的不锈钢的机械性质上学习低温度血浆 nitriding 的影响。血浆 nitriding 实验在 25%N2+75%H2 空气借助于搏动 DC 的血浆在 350 ° C 为 15 h 被执行。微观结构,阶段作文,和剩余强调 nitrided 层的侧面被光显微镜学和 X 光检查衍射决定。nitridied 表面的微坚硬侧面也被学习。疲劳生活,滑动穿,并且侵蚀穿未经治疗的标本的损失,血浆 nitriding 标本根据一旋转把疲劳测试者,弄弯被决定 ball-on-disc 穿测试者,和一个稳固的粒子侵蚀测试者。350 ° C nitrided 表面被 -Fe3N 和α N 统治的结果表演,它是使过饱和氮固体答案。他们有高坚硬和心学稳定性。那么低温度血浆 nitriding 不仅增加表面坚硬价值而且改进 wear 和侵蚀抵抗。另外,因为血浆 nitriding 在修改的层内生产剩余压缩应力, AISI 420 钢的疲劳限制能被血浆 nitriding 也在 350 ° C 改进。 | Y. T. Xi D.X. Liu D. Han Z.F. Han | 2008 | Acta Metallurgica Sinica(English Letters)2008，21，1： | 3 |
| 4 | A STUDY OF B-P UNIFIED VISCOPLASTIC CONSTITUTIVE MODEL显示文摘By combining the Bodner-Partom constitutive model and equivalent stress function,finite element methods and program on analyzing non-elastic deformation and stressfor thermal viscoplastic material are studied in this paper, and it's the first timethat this material model is used in a kind of engineering software-MARC. Thermalviscoplastic behavior of high temperature alloy GH536 specimen with gap is analyzedby this program. The research results show it is feasible to analyze thermal viscoplasticbehavior of specimen or structure by applying B-P model. | M. Zhao, G. Zhang, K.S. Zhang and L. Y. XuDepartment of Aeroengines Thermal Power, Northwestern Polytechnical University, Xi’an 710072, China | 2002 | Acta Metallurgica Sinica(English Letters)2002，15，5： | 3 |
| 5 | Investigation of the crack problem in non-local piezoelectric materials under combined electromechanical loadings显示文摘The present investigation of the crack problem inpiezoelectric materials is performed based on the non-localtheory.After some manipulations,the impermeable crack,the permeable crack(the crack gap is full of NaCI solution),and the semi-permeable crack(the crack gap is full of air orsilicon oil)are reduced to a uniform formulation by assum-ing the normal electric displacement on the crack surfaces tobe an unknown variable.Thus,a triple integral equation withthe unknown normal electric displacement is established.Byusing the Newton iterative method and solving the triple inte-gral equation,it is found that the normal electric displacementon the crack surfaces is no longer a constant as determinedby previous studies,rather,it depends upon the remote com-bined electromechanical loadings.Numerical results of thestresses and electric displacement fields show that there areno singularities at the crack tips so that the stresses remainfinite.It is of great significance that the concrete electricboundary condition on the crack surfaces exerts significantinfluence on the near-tip fields and in this way plays an impor-tant role in evaluating the crack stability in the non-localpiezoelectric materials.More specifically,the impermeablecrack model always overestimates the finite stresses at thecrack tips,whereas the permeable crack model always under-estimates them. | Q. Li Y. Chen School of Aerospace, Xi’an Jiao-Tong University,710049 Xi’an, China | 2009 | Acta Mechanica Sinica2009，25，2： | 2 |
| 6 | STUDY ON GREY FORECASTING MODEL OF COPPER EXTRACTION RATE WITH BIOLEACHING OF PRIMARY SULFIDE ORE显示文摘A model GM(grey model)(1,1) for forecasting the rate of copper extraction during the bioleaching of primary sulphide ore was established on the basis of the mathematical theory and the modeling process of grey system theory. It was used for forecasting the rate of copper extraction from the primary sulfide ore during a laboratory microbial column leaching experiment. The precision of the forecasted results were examined and modified via 'posterior variance examination'. The results show that the forecasted values coincide with the experimental values. GM(1,1) model has high forecast accuracy;and it is suitable for simulation control and prediction analysis of the original data series of the processes that have grey characteristics,such as mining,metallurgical and mineral processing,etc. The leaching rate of such copper sulphide ore is low. The grey forecasting result indicates that the rate of copper extraction is approximately 20% even after leaching for six months. | A.X. Wu Y. Xi B.H. Yang X.S. Chen H.C. Jiang | 2007 | Acta Metallurgica Sinica(English Letters)2007，20，2： | 2 |
| 7 | Corrosion fatigue behaviors of two biomedical Mg alloys – AZ91D and WE43 – In simulated body fluid显示文摘 | X.N. Gu W.R. Zhou Y.F. Zheng Y. Cheng S.C. Wei S.P. Zhong T.F. Xi L.J. Chen | 2010 | Acta Biomaterialia2010，，12： | 2 |
| 8 | AN IRREVERSIBILITY PHENOMENA IN ELECTRICAL CONDUCTIVITY OF THE MELTS IN SODIUM IRON PHOSPHATE SYSTEM显示文摘Theelectricalresistivityofsodium iron phosphate melts wasinvestigated asa functionoftem peratureand composition. Irreversibility was found in thetemperature dependent electricalresistivityinthe melts withlow Na2 Ocontentduringtheheating andcoolingcycle. Theirre versibility wasreduced withincreasing Na2 Ocontent. Theelectricalresistivity tendedto de creaseslightly withtime. Theelectricalconduction ofthe meltscontainingsimulatedindustry waste wassimilartothatofthe melts withsimilarsodacontent. Thetemperature dependent electricalresistivity and activation energy ofthese melts was discussed using the Motttheory and wascorrelatedtothe Fe(II) contentinthe | F. Y. Chen1)and E. D. Delber2) 1) State Key Laboratory of Solidification Process,Northwestern Polytechnic University ,Xi’an 710072 ,China 2) Department of Ceramics Engineering , University of Missouri Rolla, Rolla, Mo 654301 , USA | 1999 | Acta Metallurgica Sinica(English Letters)1999，12，4： | 2 |
| 9 | HIGH-TEMPERATURE LOW CYCLE FATIGUE BEHAVIOR OF NICKEL BASE SUPERALLOY GH536显示文摘Low cycle fatigue tests on nickel base superalloy GH536 were performed at 600, 700 and 800℃. The strain-life and cyclic stress-strain relationship were given at various temperatures. The change in fatigue life behavior and fatigue parameters with tem- perature increasing was discussed. At low and intermediate total strain amplitudes, the fatigue life was found to decrease with increasing temperature. | M.Zhao, L. Y. Xu, K.S. Zhang and B. Y. Yang Department of Aeroengines and Thermal Power, Northwestern Polytechnical University, Box 184, Xi’an 710072, China | 2001 | Acta Metallurgica Sinica(English Letters)2001，14，5： | 1 |
| 10 | Unbalanced expression of protease-activated receptors-1 and -2 in the colon of diarrhea-predominant irritable bowel syndrome patients显示文摘 | Zhao Xiang Bian Zhi Li Zhi Xin Huang Man Zhang Hong Li Chen Hong Xi Xu Joseph J. Y. Sung | 2009 | Journal of Gastroenterology2009，，7： | 1 |
| 11 | STUDY ON CONSTITUTIVE RELATIONSHIP OF Ti-5Al-2Sn-2Zr-4Cr-4Mo ALLOY AND SIMULATION OF HOT FORMING PROCESSES显示文摘In the present research, artificial artificial networks hare be applied to establish the constitutive rela- tionship model of Ti - 5Al - 2Sn - 2Zr - 4Mo - 4Cr (wt - % ) alloy. In the first stage of the re- search, an isothermal compressive experiment using Thermecmastor - Z hot simulator is studied to ac- quire the flow stress at different deformation temperature,equivalent strain and equivalent strain rate. Then,a feed - forward neural network is trained by using the experimental data.After the training process is finished, the neural networks become a knowledge-based constitutive relationship system. Comparison of the predicted and experimental results results shows that the neural network model has good le- arning precision and good generalization.The neural neural network methods are found to show much better agreement than existing methods with the experiment data, and have the advantage of being able to deal with noisy for or data with strong non - linear reationships. At last, this model can be aused to simulate the flow behavior of Ti - 5Al - 2Sn - 2Zr - 4Mo - 4Ca alloy. | X. Q. Zhang Y. H. Peng M. Q. Li and X. Y. Ruan( 1)Department of Plasticity Technology, Shanghai Jiao TOng University, Shanghai 200030 2)School of Material Science and Engineering, Northwestern Polytechnical University, Xi’ an 710072, China) | 2000 | Acta Metallurgica Sinica(English Letters)2000，13，1： | 1 |
| 12 | The Taihua group on the southern margin of the North China craton: further insights from U–Pb ages and Hf isotope compositions of zircons显示文摘 | Xisheng Xu William L. Griffin Xi Ma Suzanne Y. O’Reilly Zhenyu He Chengli Zhang | 2009 | Mineralogy and Petrology (-)2009，，1： | 1 |
| 13 | Dynamic Coordination of Uncalibrated Hand/Eye Robotic System Based on Neural Network显示文摘A nonlinear visual mapping model is presented to replace the image Jacobian relation for uncalibrated hand/eye coordination. A new visual tracking controller based on artificial neural network is designed. Simulation results show that this method can drive the static tracking error to zero quickly and keep good robustness and adaptability at the same time. In addition, the algorithm is very easy to be implemented with low computational complexity. | Su, J. Pan, Q. Xi, Y. | 2001 | Journal of Systems Engineering and Electronics2001，12，3： | 1 |
| 14 | Increased levels of IL ‐21 responses are associated with the severity of liver injury in patients with chronic active hepatitis B显示文摘 | Q. Pan Y. Yu Z. Tang M. Xi H. Jiang Y. Xun X. Liu H. Liu J. Hu G. Zang | 2014 | J Viral Hepat2014，，9： | 1 |
| 15 | HIGH TEMPERATURE DEFORMATION MECHANISM AND CONSTITUTIVE EQUATION OF Ti-40 BUREN RESISTANT TITANIUM ALLOY显示文摘Ti - 40 alloy is a single β phase burn resistant titanium alloy.Its high temperature deformation mech- anism is studied and its stress - strain curves are examined he use of Gleeble - 1500 thermal -simulator. The results reveal that there are abrupt flow stress drops followed b steady state.The magnitude of the flow stress drop increases with strain rote and decreases with temperature.Deformation activation energy, Q, is 247. 5 KJ/mol. The deformation mechanism of Ti - 40 alloy is controlled by the lattice diffusion Its constitutive equation is set up, i. e. | Y. Q. Zhao L. Zhou and J. Deng (Northwest Institute for Nonferrous Metal Research, P. O. Box 51 Xi’ an, Shaanxi 710016, China) | 2000 | Acta Metallurgica Sinica(English Letters)2000，13，1： | 1 |
| 16 | A Multiple Model Approach to Modeling Based on LPF Algorithm显示文摘Input-output data fitting methods are often used for unknown-structure nonlinear system modeling. Based on model-on-demand tactics, a multiple model approach to modeling for nonlinear systems is presented. The basic idea is to find out, from vast historical system input-output data sets, some data sets matching with the current working point, then to develop a local model using Local Polynomial Fitting (LPF) algorithm. With the change of working points, multiple local models are built, which realize the exact modeling for the global system. By comparing to other methods, the simulation results show good performance for its simple, effective and reliable estimation. | Li, N. Li, S. Xi, Y. | 2001 | Journal of Systems Engineering and Electronics2001，12，3： | 1 |
| 17 | Detection of ractopamine residues in pork by surface plasmon resonance-based biosensor inhibition immunoassay显示文摘 | Xiao Lu Hong Zheng Xiu-Qing Li Xue-Xia Yuan Hui Li Li-Gang Deng Hong Zhang Wen-Zheng Wang Guo-Sheng Yang Meng Meng Ri-Mo Xi Hassan Y. Aboul-Enein | 2011 | Food Chemistry2011，，4： | 1 |
| 18 | Chitin deacetylase family genes in the brown planthopper, N ilaparvata lugens ( H emiptera: D elphacidae)显示文摘 | Y. Xi P.‐L. Pan Y.‐X. Ye B. Yu C.‐X. Zhang | 2014 | Insect Mol Biol2014，，6： | 1 |
| 19 | Synthesis of magnetite nanoparticles in W/O microemulsion显示文摘 | Z. L. Liu X. Wang K. L. Yao G. H. Du Q. H. Lu Z. H. Ding J. Tao Q. Ning X. P. Luo D. Y. Tian D. Xi | 2004 | Journal of Materials Science2004，，7： | 1 |
| 20 | Corrosion fatigue behaviors of two biomedical Mg alloys – AZ91D and WE43 – In simulated body fluid显示文摘 | X.N. Gu W.R. Zhou Y.F. Zheng Y. Cheng S.C. Wei S.P. Zhong T.F. Xi L.J. Chen | 2010 | Acta Biomaterialia2010，，12： | 1 |
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