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Finite Element Analysis of Die Geometry and Process Conditions Effects on Equal Channel Angular Extrusion for β-Titanium Alloy

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Journal of Iron and Steel Research International 2012年第10期19卷 54-58页

作者： SI Jia-yong1,2. GAO Fan3, ZHANG Ji3 (1. State Key Laboratory of Powder Metallurgy, central south {2., changsha 410083, hunan, china 2. college of mechanical and electrical engineering, central south university of forestry and technology, changsha 410004, hunan, china 3. High Temperature Material Research Division, central Iron and Steel Research Institute, Beijing 100081, china) [a] State Key Laboratory of Powder Metallurgy Central South University Changsha 410083 Hunan China [b] college of mechanical and {2. engineering Central South University of Forestry and Technology Changsha 410004 Hunan China [c] High Temperature Material Research Division Central Iron and Steel Research Institute Beijing 100081 China

The finite element analysis was applied to evaluate the respective influences of die geometry and process conditions on plastic strain distribution for β-titanium (Ti-13V11Cr3Al) alloy during the equal channel angular extrusion (ECAE). It was found that optimum equal channel angular extrusion die geometry is strongly material dependent. Optimal strain homogeneity in the Ti-13V11Cr3Al alloy may be achieved at r (inner radius)=5 mm, R (outer radius)=3 mm. The equivalent plastic strain increases with increasing friction coefficient. And the better homogeneity of the equivalent plastic strain distribution can be achieved when friction coefficient value is lower. The faster the ram speed is, the lower the homogeneity of the equivalent plastic strain distribution is and the influence is slight. The back-pressure does not help to improve the plastic strain homogeneity, and the increasing temperature has a slightly favourable effect on the plastic strain homogeneity between 400 and 600 ℃.

关键词： equal channel angular extrusion finite element analysis die geometry β-titanium

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MOTION ANALYSIS AND DESIGN OF ACCUMULATOR FOR HYDRAULIC ROCK DRILL

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中国有色金属学会会刊：英文版 1996年第2期6卷 148-151页

作者： Liu Shixun(college of mechanical and {2. engineering, central south university of technology, changsha 410083) CENT S UNIV TECHNOL COLL MECH & ELECT ENGNCHANGSHA 410083PEOPLES R CHINA

ＭＯＴＩＯＮＡＮＡＬＹＳＩＳＡＮＤＤＥＳＩＧＮＯＦＡＣＣＵＭＵＬＡＴＯＲＦＯＲＨＹＤＲＡＵＬＩＣＲＯＣＫＤＲＩＬＬＬｉｕＳｈｉｘｕｎ（ＣｏｌｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥｌｅｃｔｒｉｃａｌＥｎｇｉｎｅｅｒｉ... 详细信息

ＭＯＴＩＯＮＡＮＡＬＹＳＩＳＡＮＤＤＥＳＩＧＮＯＦＡＣＣＵＭＵＬＡＴＯＲＦＯＲＨＹＤＲＡＵＬＩＣＲＯＣＫＤＲＩＬＬＬｉｕＳｈｉｘｕｎ（ＣｏｌｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥｌｅｃｔｒｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ，ＣｅｎｔｒａｌＳｏｕｔｈＵｎ...

关键词： hydraulic accumulator diaphragm service life stretching ratio parameter design,motion analvsis

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EXTRAPOLATING METHOD IN PLOT FOR FATIGUE LIFE PREDICTION OF COMPONENTS

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中国有色金属学会会刊：英文版 1996年第3期6卷 153-156页

作者： Liu Yilun Wang Ailun(college of mechanical and {2. engineering,central south university of technology, changsha 410083) CENT S UNIV TECHNOL COLL MECH & ELECT ENGNCHANGSHA 410083PEOPLES R CHINA

ＥＸＴＲＡＰＯＬＡＴＩＮＧＭＥＴＨＯＤＩＮＰＬＯＴＦＯＲＦＡＴＩＧＵＥＬＩＦＥＰＲＥＤＩＣＴＩＯＮＯＦＣＯＭＰＯＮＥＮＴＳ￥ＬｉｕＹｉｌｕｎ；ＷａｎｇＡｉｌｕｎ（ＣｏｌｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥｌｅｃｔ... 详细信息

ＥＸＴＲＡＰＯＬＡＴＩＮＧＭＥＴＨＯＤＩＮＰＬＯＴＦＯＲＦＡＴＩＧＵＥＬＩＦＥＰＲＥＤＩＣＴＩＯＮＯＦＣＯＭＰＯＮＥＮＴＳ￥ＬｉｕＹｉｌｕｎ；ＷａｎｇＡｉｌｕｎ（ＣｏｌｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥｌｅｃｔｒｉｃａｌＥｎｇｉｎｅｅｒｉｎｇ，...

关键词： extrapolation plot fatigue life

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The Influence of Some Key Parameters on Fatigue Life of Common Metallic Components

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Journal of central south {2. 2000年第3期12卷 159-161页

作者： LIU Yi lun (college of mechanical and {2. engineering, central south university, changsha 410083, china) 1. college of mechanical and {2. engineering Central South University 410083 Changsha China

The effect of key parameters on fatigue life of common metallic components, e.g. steel, aluminium alloy, has been analysed quantitatively. The influential coverage and degree of these parameters have been investigated systematically, some phenomena which can′t be discovered with qualitative analysis method have been revealed, a series of valuable conclusions has been obtained, which would be very beneficial to fatigue resistant design and improvement of anti fatigue ability of metallic components.

关键词： metallic material component fatigue life key parameter effect

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CALCULATION OF ELASTIC ERROR OF PLANAR MECHANISM—AN EQUIVALENT METHOD

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Journal of central south {2. 1999年第1期11卷 57-59页

作者： Wang Ailun Zhong Jue Chang Tiegang (college of mechanical and {2. engineering, central south university of technology, changsha 410083, china) college of mechanical and {2. engineering Central South University of Technology Changsha410083 China

In rigid mechanism dynamic analysis, the equivalence theorem is often used due to its simplicity and perceivability. Based on conjugation and duality between inertia energy storing element and elastic energy storing element, the equivalence theorem is used in elastic error analysis of planar mechanism. A set of calculation formula of elastic error is introduced, and these equations are similar in expression form to the rigid dynamic equation. To demonstrate the method developed, a computation example is given.

关键词： planar mechanism elastic error equivalent flexibility

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Research on common issues for relationship between mechanism degree of freedom,driving link and executive link

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Science china(Technological Sciences) 2009年第4期52卷 966-974页

作者： WANG AiLun college of mechanical & {2. engineering, central south university, changsha 410083, china Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing, Ministry of Education, changsha 410083, china 1. college of mechanical & {2. engineering Central South University Changsha 410083 China 2. Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing Ministry of Education Changsha 410083 China

During engineering practice and theoretical research, the mechanism degree of freedom is sometimes unequal to the number of the driving link, which is unable to be explained according to the classic theory of the mechanism degree of freedom. To solve this problem, the duality description for operating laws of mechanism is introduced based on the concepts of duality. The Junction-Structure Equation is established for the port descriptions of general ideal mechanism and the functional description for the mechanism degree of freedom is described by utilization of bond graph theory. The force-transfer de- gree of freedom, i.e. the antithesis concept of movement-transfer degree of freedom, is introduced and defined based on the analysis of energy transfer as well as the analysis of signal causality. By utiliza- tion of structural description, functional description and duality description for the equation of degree of freedom, the relationship between the movement-transfer degree of freedom and force-transfer de- gree of freedom is further explored and analyzed. Thus, the relationship between the mechanism de- gree of freedom upon the driving link and the executive link is described generally. Finally, some typical relationships between the mechanism degree of freedom, the driving link and the executive link are analyzed.

关键词： duality bond graph Junction-Structure Equation driving link executive link degree of freedom

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THE PRELIMINARY ATTEMPT TO DEVELOP PREVENTIVE-PREDICTIVE MAINTENANCE

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Journal of central south {2. 1995年第2期7卷 32-36页

作者： Bu Yingyong Zhang Huailiang(college of mechanical and {2. engineering, central south university of technology, changsha, 410083, china) 1. college of mechanical and {2. engineering Central South University of Technology 410083 Changsha China

This paper presents a conception of Preventive-Predictive Maintenance, describes a living instance which combines the technology of equipment condition supervising and failure diagnosing with the system of computer a... 详细信息

关键词： equipment management maintenance computer

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Calculation and characteristics analysis of blade pitch loads for large scale wind turbines

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Science china(Technological Sciences) 2010年第5期53卷 1356-1363页

作者： DAI JuChuan1,2.HU YanPing1,LIU DeShun1,2.& LONG Xin3 1 School of Electromechanical engineering,{2. university of Science and technology,Xiangtan 4112.1,china 2.college of mechanical and electrical engineering,central south university,changsha 410083,china 3 Hara XEMC Windpower Co.,Ltd.,Xiangtan 411000,china 1. School of Electromechanical engineering Hunan University of Science and Technology Xiangtan 411201 China2. College of Mechanical and Electrical Engineering Central South University Changsha 410083 China3. Hara XEMC Windpower Co. Ltd. Xiangtan 411000 China

Based on the electric pitch system of large scale horizontal-axis wind turbines,the blade pitch loads coming mainly from centrifugal force,aerodynamic force and gravity are analyzed,and the calculation models for them are established in this *** illustration,a 1.2.MW wind turbine is introduced as a practical sample,and its blade pitch loads from centrifugal force,aerodynamic force and gravity are calculated and analyzed separately and *** research results showed that in the process of rotor rotating 360o,the fluctuation of blade pitch loads is similar to cosine curve when the rotor rotational speed,in-flow wind speed and pitch angle are ***,the amplitude of blade pitch load presents quite a difference at a different pitch *** ways of calculation for blade pitch loads are of the universality,and are helpful for further research of the individual pitch control system.

关键词： blade pitch loads wind turbine individual variable-pitch pitch axis

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SURFACE ROUGHNESS EFFECTS IN ALUMINIUM ROLLING

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中国有色金属学会会刊：英文版 1996年第3期6卷 157-160页

作者： Tan Jianping Zhong Jue Yang Ping(college of mechanical and {2. engineeringcentral south university of technology, changsha 410083) CENT S UNIV TECHNOL COLL MECH & ELECT ENGNCHANGSHA 410083PEOPLES R CHINA

ＳＵＲＦＡＣＥＲＯＵＧＨＮＥＳＳＥＦＦＥＣＴＳＩＮＡＬＵＭＩＮＩＵＭＲＯＬＬＩＮＧ￥ＴａｎＪｉａｎｐｉｎｇ；ＺｈｏｎｇＪｕｅ；ＹａｎｇＰｉｎｇ（ＣｏｌｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥｌｅｃｔｒｉｃａｌＥｎｇｉ... 详细信息

ＳＵＲＦＡＣＥＲＯＵＧＨＮＥＳＳＥＦＦＥＣＴＳＩＮＡＬＵＭＩＮＩＵＭＲＯＬＬＩＮＧ￥ＴａｎＪｉａｎｐｉｎｇ；ＺｈｏｎｇＪｕｅ；ＹａｎｇＰｉｎｇ（ＣｏｌｌｅｇｅｏｆＭｅｃｈａｎｉｃａｌａｎｄＥｌｅｃｔｒｉｃａｌＥｎｇｉｎｅｅｒｉｎｇＣｅｎｔｒａｌＳｏｕ...

关键词： rolling oil film thickness surface roughness

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Effect of Tocopherol on Antioxygenic Properties of Green Lubricating Oil

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Journal of Wuhan university of technology(Materials Science) 2008年第3期23卷 289-292页

作者：肖志信 college of mechanical and {2. engineering Central South University Department of mechanical engineering Hunan Institute of TechnologyHengyang 421002China

Based on the needs of green motor oil, and in order to improve the antioxidation properties of green lubricating oil, the effect of tocopherol antioxidation properties of rapeseed oil was studied. Experiments of high temperature oxidation, antiwear and infra-red spectrum analysis were accomplished, the results show that the rapeseed oil including tocopherol can still keeps steady structure after high temperature oxidation, with a small variety of acid number, whose antioxygenic properties are improved evidently. Meanwhile, both thiocarbamate and vitamin C play an assistant role in tocopherol, which can make rapeseed oil to have better oxidation stability and keep excellent antiwear properties after high temperature oxidation.

关键词： rapeseed oil tocopherol antioxygenic properties

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