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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 university 2000年第3期12卷 159-161页

作者： LIU Yi lun (college of mechanical and Electrical engineering, Central south university, Changsha 410083, china) 1. college of mechanical and Electrical 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

The Research of Controlling Inclusions in Middle and High Carbon Steel During TSCR

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Journal of Iron and Steel Research International 2011年第S2期18卷 365-370页

作者： LI Lie-jun1, GAO Ji-xiang1,2 (1. School of mechanical and Automotive engineering, south china university of technology, guangzhou 510640, Guangdong, china 2. CSP applying technology institute, GISE, guangzhou 510730, Guangdong,china) S china Univ Technol Sch Mech & Automot Engn Guangzhou 510640 Guangdong Peoples R China GISE CSP Applying Technol Inst Guangzhou 510730 Guangdong Peoples R China

Based on the characteristics of Thin slab casting and rolling (TSCR) process,using test methods such as SEM,EDS and measuring content of inclusions, the influencing factor of controlling inclusions during producing middle and high carbon steel was studied. The technologies of electric furnace smelting, LF refining and controlling inclusions of tundish were proposed. The inclusions control level of middle and high carbon steel in which the carbon content is 0.3-1.0%, The level reached and even exceeded the level of like product producing with conventional process at home and abroad.

关键词： thin slab casting and rolling (TSCR) middle and high carbon steel inclusions

The Growth of Latex Particles during the VAc/BA Copolymerization

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Journal of Wuhan university of technology(Materials Science) 2006年第3期21卷 86-89页

作者：秦少雄 School of Chemical and Energy engineering South China University of TechnologyGuangzhou 510640 ChinaCollege of Chemistry and Environment Engineering Yangtze UniversityJingzhou 434100China

The semi-continuous seeded emulsion eopolymerization of vinyl acetate and butyl acrylate was carried out with hydroxyethyl cellulose as a colloid stabilizer. The morphology of the latex particle and the relationship between the reaction time and the average particle diameter and/or the conversion ratio during the polymerization were invstiguted. The experimental results shaw that the morphology of the latex particle possesses the stable sterie construction. In the seeded polymerizution, the average particle diameter of latex decreased while the conversion ratio increased. At the second term of the emulsion copolymerization （the growth stage of particle size）, the latex particle average diameter increased with copolymerization continuously, but the instantaneous conversation ratio was not large, so it was very necessaO to properly prolong the time during the holding temperature stage.

关键词： hydroxyethyl cellulose VAc/ BA latex average particle diameter conversion ratio

Description to wear debris boundaries by radar graph fractal method

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Chinese Science Bulletin 2007年第16期52卷 2285-2290页

作者： LIU HongTao1,2 & GE ShiRong1 1 Institute of Tribology and Reliability engineering,china university of Mining & technology,Xuzhou 221008,china 2.college of mechanical and Electrical engineering,china university of Mining & technology,Xuzhou 221116,china Institute of Tribology and Reliability engineering China University of Mining and Technology Xuzhou 221008 China

In this paper,radar graph fractal method is introduced to describe wear debris boundaries. Research results show that it is a nice way to describe wear debris boundaries. Since the longest axis is selected as the first coordinate axis,its center point selected as the center point of the radar graph,and the co-ordinate value of wear debris boundary selected as the measure parameter,the limitations existing in Yard fractal measure method can be avoided. For any wear debris,its radar graph fractal dimension value is one and only,and as the wear debris shape changes from round to strip,the radar graph fractal dimension value also changes from low to high,showing strong uniqueness and independence. Due to the fact that the researched wear debris is gotten in different wear states,the results also prove that radar graph fractal dimension value is correlated with frictional pairs work condition and wear state. Radar graph fractal method is compared with Yard fractal measure methods,and results show that ra-dar graph fractal dimension values gotten from different wear debris have enough value grads to avoid effect of errors,and provide higher sensitivity for wear debris shape. This paper also discusses the influencing factors for radar graph fractal method. With the increase of the decomposing degree value,the radar graph fractal dimension tends to keep stable at one certain value,showing the typical characteristic of the fractal theory. All this proves that radar graph fractal method is an effective description method for wear debris boundaries.

关键词：磨粒边界雷达图表分形法

Thermal and Thermo-oxidative Degradation of Flame Retardant High Impact Polystyrene with Triphenyl Phosphate and Novolac Epoxy Resin

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Journal of Wuhan university of technology(Materials Science) 2007年第3期22卷 486-489页

作者：李慧勇贾德民 college of Materials Science and engineering South China University of Technology

Thermal and thermo-oxidative decomposition and decomposition kinetics of flame retardant high impact polystyrene （HIPS） with triphenyl phosphate （TPP） and novolac type epoxy resin （NE） were characterized using thermo-gravimetric experiment. And the flammability was determined by limited oxygen indices （LOI）. The LOI results show that TPP and NE had a good synthetic effect on the flame retardancy of HIPS. Compared with pure HIPS, the LOI values of HIPS/NE and HIPS/TPP only increased by about 5%, and the LOI value of HIPS/TPP/NE reached 42.3%, nearly 23% above that of HIPS. All materials showed one main decomposition step, as radical HIPS scission predominated during anaerobic decomposition. TPP increased the activity energy effectively while NE affected the thermal-oxidative degradation more with the help of the char formation. With both TPP and NE, the materials could have a comparable good result of both thermal and thermal-oxidative degradation, which could contribute to their effect on the flame retardancy.

关键词： high impact polystyrene flame retardant thermal degradation thermo-oxidative degradation

Development of a Reconfigurable Platform for Manufacturing Equipment Control

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武汉理工大学学报 2006年第S3期28卷 810-814页

作者： FENG Shouting LI Di CHENG Xiangyu college of mechanical engineering,south china university of technology,guangzhou 510640,china college of mechanical engineering South China University of TechnologyGuangzhou 510640China

In modern manufacturing equipment control area,controller is required to deliver higher computing capability for adopting advanced algorithms to meet speed and accuracy requirements,and reconfigurabilities for changing or(and)adding features or *** paper presents a methodology in design and implementation of a high performance and reconfigurable platform for manufacturing equipment *** methodology is in virtue of system on a programmable chip(SoPC)technolo- gy but replacing the on-chip processor by an external high performance,floating-point digital signal processor(DSP).The appli- cation of the DSP is designed as a multi-threaded framework,which has more flexibilities than a traditional single-loop ***- thermore,the field programmable gate array(FPGA)system can be reconfigured easily and quickly to meet a new requirement by dragging and dropping pre-built components in a SoPC building *** a result,the controller platform is more recon- figurable in terms of algorithms and *** platform is implemented in a 3-axis milling machine control and the result indicates that the design and implementation presented in this paper is feasible.

关键词： machine tool control digital signal processor field programmable gate array system on a programmable chip

PROPERTIES AND MORPHOLOGY OF UNSATURATED POLYESTER/ACRYLATE-TERMINATED POLYURETHANE/ORGANO-MONTMORILLONITE NANOCOMPOSITES

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Chinese Journal of Polymer Science 2005年第5期23卷 471-478页

作者： Chang-jiang You Jin-guo Xu Song Xi Xiao-xia Duan Jie Shen and De-min Jia college of Materials Science and engineering,south china university of technology,guangzhou 510640,china S china Univ Technol Coll Mat Sci & Engn Guangzhou 510640 Peoples R China

Unsaturated polyester resin （UPR）/acrylate-terminated polyurethane （ATPU）/organo-modified montmorillonite （OMMT） nanocomposites were prepared by the in situ intercalative polymerization method. Samples were prepared by the sequential mixing, i.e. mixture of the ATPU and styrene （S） and OMMT were prepared in the first step; UPR was then added to the pre-intercalates of ATPU/S/OMMT. Results indicate that the mechanical properties and thermal properties of UPR/ATPU/OMMT nanocomposites greatly depend on the amount of ATPU and OMMT. Results show that the addition of ATPU could increase the impact strength of UPR/ATPU composites, but the tensile strength, flexural strength and heat resistance of the materials are obviously decreased. When the weight ratio between UPR, ATPU and OMMT were 82：15：3, the impact strength and heat distortion-temperature of nanocomposite were greatly improved, meanwhile there was little change for other properties of the nanocomposites. The synergistic enhancement effects of ATPU and OMMT on the composites were observed. The structures and morphology of the composites were investigated by X-ray diffraction, scanning electron microscopy and transmission electron microscopy.

关键词： Unsaturated polyester Acrylic terminal polyurethane Organo-modified montmorillonite Nanocomposite.

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 Electrical 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

Solution of a hollow thick-wall cylinder subject to quadric function pressures and its limit when l→∞

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Science china(Technological Sciences) 2004年第2期47卷 229-236页

作者： LIU Zhubai1,SHAN Rui2,LIU Wen2 & NI Liyong1 1.college of mechanical engineering,Yanshan university,Qinhuangdao 066004,china 2.college of Science,Yanshan university,Qinhuangdao 066004,china 1. college of mechanical engineering Yanshan University 066004 Qinhuangdao China 2. college of Science Yanshan University 066004 Qinhuangdao China

The problem of a hollow thick-wall cylinder subject to quadric function pressures is solved with a new stress function, thus laying the basis for solving the spatial symmetric deformation of a hollow cylinder subject ... 详细信息

关键词： quadric function pressure, analytic solution, stress function, hollow cylinder.