bluuebunny/crossref_metadata_2025 huggingface dataset:
A Newly Solve Project on Rupture of Connected-Mold Bearing of Roller Foam Machine Based on Finite Element Theory
Authors: Meng Ling Qin , Wang Zhi Wei , Li Yan Qin , Lv Guang Ming , Zuo Fei , Zhang De Hai
Published: November 2010

Since it is often appeared that connected-mold bearing FC208 rupture of roller foam machine in the production progress of a domestic company. A newly solve project on rupture of connected-mold bearing of roller foam machine based on finite element (FE) theory is put forward. All campaign process of this kind of machine is carried on mechanical analysis, and the maximum load force of bearing is calculated. FE models of FC208 and FC209 bearing are set up using ABAQUS software. The related simulation and analysis are conducted and force conditions of both components are compared with. The result of stress value is FC209 bearing is less than FC208 bearing. FC209 bearing is used in seven-positions rotating equipment made by ourselves in the company's No.40 # shop. The self-made equipment is running steady and reasonability of the improved design is proved.
High Energy Shot Peening of Commercially Pure Titanium TIG Weld Joint
Authors: Chen Chun Huan , Ren Rui Ming
Published: November 2010

Commercially pure Titanium (CP-Ti) TIG weld joint was treated by means of high energy shot peening (HESP) using a shot peening equipment commonly used in industry. The nanostructured surface layer was characterized by XRD, TEM, SEM and Microhardometer. The results showed that surface nanocrystallization of CP-Ti TIG weld joint were realized by high energy shot peening treatment. The finest grain size in the top surface layer is about 40nm. The hardness of the surface layer is enhanced significantly after shot peening compared with that of the as-welded joint, which resulted in a remarkable surface hardening effect. Surface welded defects such as air pores are eliminated successfully so that relative uniform surface layer was obtained.
Multistage Cold Extrusion Process and Forming Rules of Shaft Parts Used in Gearbox
Authors: Ji Dong Sheng , Jin Jun Song , Ma Wei Jie , Xia Ju Chen , Xia Han Guan , Dong Yi
Published: November 2010

The production method of a driving axles used in gearbox is presented in this paper. A five-stage cold extrusion technology for forming the driving axle was made. First, simulations based on thermal-mechanical coupling finite element model were performed with Deform_2D. During the forming process, the concave appeared at the shaft end. And its formation mechanism was studied. Then the forming rules were obtained. Corresponding experiments were carried out and quality forging was achieved. Simulation and experimental results both indicate that the five-stage cold extrusion technology was feasible.
The Quick and Practical Algorithm for Spiral Line Interpolation
Authors: Zhang Jia Ying
Published: November 2010

In this paper, a quick and practical algorithm for spiral line interpolation is introduced. Comparing with the most other spiral line interpolation algorithms，the quick and practical algorithm is quick, simple and being have little error for the spiral line interpolation. The algorithm is also suited for the spiral line having numbers of pitches. The algorithm is balanced with the speed and the accuracy of caculation well. The cutting is more smoothly.
Surface Based Virtual Mechanical Equipment Modification
Authors: Wang Xiao Ling , Zhao Hui
Published: November 2010

We present a surface based system to manipulate virtual mechanical equipment. Our system can modify or deform the equipment as will. As we model the process of manipulation as a linear system which can be solved very fast by state-of-art numerical solver, our system is very efficient. We also provide an intuitive user interface for our system.
Effect of Extruding Parameters on Soybean Oil Yield of Enzyme-Assisted Aqueous Extraction Processing
Authors: Li Yang , Jiang Lian Zhou , Qiao Guo Hua
Published: November 2010

Experiments were carried out to investigate effects of extruding parameters on soybean oil yield extracted with enzyme-assisted aqueous extraction. It was found that extrusion and expansion parameters affected significantly on total soy oil yield. Optimal extrusion and expansion parameters for highest total soy oil yield were obtained using response surface methodology. Effect of extrusion and expansion pretreatment on soy cells was studied using light microscope and transmissive microscope. State of free oil and protein during hydrolysis was observed using light microscope. Ultrasonic assistant ethanol de-emulsification was found the effective method to destabilize the emulsion.
Study on Optimum Product Portfolio of Coach Board for Metallurgical Enterprise Based on Four-Dimensional Analysis Method
Authors: Han Liang , Du Rong
Published: November 2010

The paper analyzes the application of traditional Boston matrix method and three dimensional analysis chart method on product portfolio of metallurgical enterprise, and raises a four dimensional analysis method by inheriting their advantages and improve disadvantages. It is more effectively and practically to establish optimum product portfolio of domestic metallurgical enterprise by the four dimensional analysis method and the four elements are market share, sales growth rate, profitability and sales efficiency. When metallurgical enterprises analyze the optimum product portfolio using four dimensional analysis method, they should take sales efficiency fully into account, adjust product portfolio timely and at last realize the optimum product portfolio.
Effect of Ce on Vitriol Corrosion Resistance of Aluminum Bronze Alloy Coatings
Authors: Wang Huai Zhi , Wang Zhi Ping , Lu Yang
Published: November 2010

The effect of Ce on vitriol corrosion resistance of aluminum bronze alloy coating was studied by static immersing corrosion test, electrochemistry test, XRD, SEM, EPMA, XPS et al. The results show that Ce can improve the corrosion resistance of Cu-14%Al-X coastings. Selective corrosion happened in 5%H2SO4 solution and Al and Fe were prior to be etched. This alloy coatings possesses good corrosion resistance.
Numerical Study of Shaped Charge Jet Formation and Penetration into Multi-Layer with Different Liner Material
Authors: Kang Yan Long , Jiang Jian Wei , Wang Shu You , Men Jian Bing
Published: November 2010

This paper investigates the penetration performance of shaped charge against multi-layer target. A titanium alloy liner of shaped charge is proposed in order to obtain large perforated hole. Jet formation and penetrating into multi-layer target was calculated by hydro code AUTODYN. For different liner material include titanium alloy, mild steel and Cu, the explosion energy conversion, jet tip velocity and jet length, also the penetration performance are studied. It is found that the kinetic energy of jet is larger and the shape of jet is podgier when the liner material is titanium alloy, the perforated hole diameter on multi-layer improved 20% compare with the mild steel and Cu liner, the numerical simulation is good agreement to experimental results.
FEA of Fatigue Behaviour of Adhesively Bonded Joints
Authors: He Xiao Cong
Published: November 2010

Adhesive bonding is a high-speed fastening method which is suitable for joining advanced lightweight sheet materials that are hard to weld. Latest literature relating to finite element analysis (FEA) of fatigue behaviour of adhesively bonded joints is reviewed in this paper. The recent development in FEA of fatigue behaviour of adhesively bonded joints is described with particular reference to three major factors that influence the fatigue behaviour of adhesively bonded joints: failure mechanism, environmental effects and hybrid joining techniques. The main FE methods used in FEA of fatigue behaviour of adhesively bonded joints are discussed and illustrated with brief case studies from the literature.
Numerical Simulation in Deep Drawing of Cylindrical Cup with Circular Diving Equally Small Holes on Edge of Circle Blank
Authors: Shi Yu Qing
Published: November 2010

Deep-drawing is one of the most important methods to form sheet metal ,but wrinkling and fracture are the main failure modes in sheet-metal forming. Blank shape is important for deep-drawing because of an effective way to promote deep formability sheet metal .This paper presents an attempt to determine the effect of circle blank with circular diving equally small hole on edge of circle blank on the fracture and wrinkling and was investigated using 08Al sheet metal .The circular blank with small hole of diameter = was analyzed to eliminate wrinkling and fracture in deep-drawing .The aim of this study is to investigate the circular diving equally small hole on edge of circle blank on formability in the deep-drawing process and to obtain useful date from the industrial field .The experiment show that limit formability promote with punching small holes on circle blank in deep-drawing process.
The Effect of Initial Microstructure on Surface Nanocrystallization of Quenched and Tempered Steel
Authors: Ba De Ma , Ma Shi Ning , Meng Fan Jun
Published: November 2010

Nanocrystalline surface layer was fabricated on a quenched and tempered Cr-Si alloy steel by using Surface mechanical treatment. The microstructure features of various sections in the surface layer were characterized by using transmission electron microscopy (TEM). By analyzing the microstructural characteristic at different depths in the treated surface, the effect of the initial microstructures on grain refinement process of quenched and tempered steel was investigated. Experimental evidence showed the initial subgrains with small angle boundary and lower dislocation density were firstly developed into Lamellar-type dislocation cells (DCs) with dense dislocation walls (DDWs). Some initial subboundaries were moved to DDWs by dislocation activities. The width of lamellar-type DCs was 2-3 times of that of initial lathy subgrains. The size of the DCs and subgrains formed in the interim of refinement process was not uniformity. On the top surface the cementite granules were decomposed or fragmented to hyperfine particles, and the size of the grains tended to uniformity. Experimental analysis indicated the configuration of microstructure was affect by the initial microstructure in the initial stage and the interim of the grain refinement process. Surface nanocrystallization of Cr-Si steel can be attributed to dislocation activities.
A Feasibility Study of Electro-Spark Deposit 'Sandwich-Like' Coating on Thermal Sensitive Superalloy
Authors: Zhang Jie , Wang Mao Cai , Zhai Yu Chun
Published: November 2010

Gas turbine components are subjected to high temperature and high stress during engine operation, so they often become physically damaged due to the formation of cracks, voids and worn surfaces. In order to develop a new process for repairing gas turbine components with high strength filler materials, an attempt has been made to prepare IN738/NiCrSi/IN738 sandwich-like coating on thermal sensitive superalloy IN738 substrate and heat-treat it in a vacuum furnace. The microstructure morphologies, hardness and element distribution of as-deposited and as- heat-treated coatings have been investigated. The results showed that there were lot of cracks and voids in the deposited ‘sandwich-like’ coating but they could be eliminated by heat treatment. The diffusion of activated element Si in the sublayer NiCrSi of ‘sandwich-like’ coating was beneficial to healing cracks.
Study on Preparation of Oil-Based Fe3O4 Nano Magnetic Fluid
Authors: Chen Bing , Fan Yu Guang , Zhou San Pin
Published: November 2010

Adopting chemical coprecipitation and mechanical dispersion to prepare oil based magnetic fluid is a good way to increase the stability of magnetic fluid. This paper uses orthogonal design to analyze the influences from different factors, and The size of nano-particles and saturation magnetization were characterized by TEM and WSM vibration magnetometer. The results show that the NaOH solution adding speed of 0.4 ml/s and reaction temperature of 50 ~55 , sodium oleate solution adding speed of 0.3ml/s and heating temperature of 65 , heat-maintaining time of 20min are proper reaction conditions.
Magnetorheological Fluid for Levitation Migration Technology
Authors: Hu Xu Lin , Guang Yang , Cui Pan Chao
Published: November 2010

The dispersed particles of magnetic fluid form stable chain-like clusters under the magnetic field, and shows “the flowing is controllable and the shape is controllable” effect. Based on this characteristic, using migration magnetic acted on the magnetic fluid, the object directional migration can be realize, then the magnetic fluid form ribbon at the same time, has the similar fluctuation behavior. The magnetic fluid aerosol migration principle, the aerosol magnetic circuit design, the magnetic field strength and the magnetic force were separately discussed in this paper. The magnetic fluid hover height using the MSL micrometer dial has determined and aerosol migration feasibility has confirmed using the experiment.
The Preparation and Photocatalytic Activity of Ni-Doped ZnS Nanoparticles
Authors: Han Qiao Feng , Diao Guo Zhu , Liu Xiao Heng , Wang Xin
Published: November 2010

Zinc sulfide nanoparticles as undoped and doped with nickel have been prepared by the reaction of Zn(CH3COO)2 and Ni(CH3COO)2 with potassium O-ethyldithiocarbonate (ethyl xanthate, C2H5OCS2k) at 80 in N, N - dimethylformamide (DMF) solution for 24 h. The structures of the products were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM), and their optical properties were studied by UV-Vis spectroscopy. The photocatalytic experiment by degrading methyl orange in aqueous solution under UV light indicated that the degradation efficiency of Ni (6%)-doped ZnS nanoparticles increased to 75% with comparison to 43% of degradation efficiency for undoped ZnS nanoparticles.
Preparation and Characterization of Cordierite Powder via Tween-80 Modified Citrate Sol-Gel Method
Authors: Wang Yu Yue , Feng Juan Juan , Liu Yi
Published: November 2010

In this paper, cordierite (2MgO•2Al2O3•5SiO2) precursors are synthesized using TEOS and aluminum and magnesium nitrates as starting materials, citric acid as chelating agent and Tween-80 as dispersant. The effect of citric acid and Tween-80 on the formation mechanism of α-cordierite phase is investigated by using X-ray diffraction (XRD), while the effect of citric acid and Tween-80 on the particle morphology of α-cordierite is examined by using scanning electron microscopy (SEM) and field emission scanning electron microscopy (FESEM). The results show that citric acid used as chelating agent can reduce the formation temperature of α-cordierite to 1150°C by forming stable salt of citric acid with all the metal ion to avoid composition deviation from the sample components during solvent evaporation process and sub-micron cordierite particles without hard agglomeration can be obtained. Nano-sized α-cordierite can be obtained with the introduction of Tween-80 as dispersant by modifying the surfaces of the colloidal sol particles.
Research on the Pavement Performance of Recycled Asphalt Mixture Processed by Microwave
Authors: Zhu Song Qing , Shi Jin Fei , Hao Fei
Published: November 2010

In order to evaluate the pavement performance of recycled asphalt mixture processed by microwave, an experimental method was designed to compare the microwave heating with the conventional heating in recycling affection of asphalt mixture. The samples AC-13 were produced. Conventional and microwave heating performance of modified asphalt recycling test including the rutting test, the trabecular cold bending test, the Marshall immersion test, the freeze-thaw split test, and the splitting strength mechanical properties were test. The experimental results show that it is roughly the same in the high temperature stability and mechanical properties of these two areas, and at low temperature cracking resistance the use of microwave processing can improve the low temperature flexibility to reduce the surface temperature seasonal prone temperature shrinkage cracks and fatigue cracks. The stability on the water by using microwave processing can enhance the asphalt and aggregate adhesion so that mixture enhanced resistance to water damage, there is a better role in improving the water stability. These results could promote microwave recycling and provide the basis for the promotion applications.
Friction and Wear Behaviour of Al2O3 Particulates Reinforced Al-Mn Alloy Matrix Composites
Authors: Li Xin Mei , Liu Bing , Sun Wen Lei , Liu Xiang
Published: November 2010

Al-2%Mn alloy matrix composites reinforced with Al2O3 particulates was fabricated by stir-casting, and the hardness and friction and wear behaviour of the composites were analyzed using Brinell hardness tester and ring-on-block tribometer under both dry and lubricated sliding in which the .SO4•Cl- Na•Ca• Mg corrosive alkalescent aqueous solution accompanied with SiO2 and Al2O3 grinding particles was used as lubricant. The wear mechanism and the effect of Al2O3 particulates on the friction and wear behaviour of the composites were discussed. The results showed that the friction coefficients of the samples under dry condition are generally lower than those under lubricated one. In comparison with the base aluminium and the Al-2%Mn alloy, the hardness of the composites increases~70%, the friction coefficients are lower in most cases especially at higher applied loads under lubricated condition, and the wear mass losses are much less at any applied loads whether under dry or lubricated condition. The composites possesses a good wear-resistance and antifriction due to its higher hardness.
Research on the Tribological Properties of SF Polymer Water-Lubricated Bearings
Authors: Wu Zhu Xin , Zheng Lin Liu , Fan Fa Xiao
Published: November 2010

In the paper, the SF polymer water lubricated bearings is taken as the research objects. Both material testing and bearing simulation testing are carried out to research the tribological properties of bearings including water swelling properties, friction coefficient, and wear-resistant properties mainly. The results show that the SF material, which is a new type of material used in water lubricated tail bearing, has the characteristics of low friction coefficient, high load capacity, good wear-resistance, excellent self-lubricating properties, and low water swelling, which has a broad application in the shipbuilding industry.
Analysis of Effection of the Prestressing Force on Shear Lag in Curved Box Girder
Authors: Zhang Yu Hong , Zhang Jian Shun
Published: November 2010

The impact on curved box girder bridges due to applying prestressing force have been analyzed using finite element method. This paper presents the results of an experimental investigation and analytical studies. Based on the model experiment, the results and conclusions of shear lag in curved box girder with prestressing force are presented that prestressing force has changed shear lag distribution. The prestressing force action on box girder shall be considered comprehensively, structural force shall be analyzed accurately, optimize prestressing tendons shall be set rationally which would make force more rationally. The results highlighted that the impact factors of a curved box girder bridge have been observed to be generally very high, while those of the other responses are also relatively higher than that of corresponding straight box girder bridge.
The Preparation of Coatings with Codepositon Plating on A3 Steel and its Corrosion Resistance
Authors: Chen Shang Dong , Sun Ting , Nian Hong
Published: November 2010

A new method for preparation of coatings with codeposition plating on the ordinary A3 steel and heat treatment later. Research the coatings on electrochemical corrosion behavior variation in Q-sun. Results show that corrosion potential shuffle, corrosion current density reduced nearly two number magnitudes value, polarization resistance increased, the cathode polarization effect enhanced obviously in polarization curves, and self-corrosion current reduced, impedance increased twenty times in alternating current impedance atlas than A3 steel substrate without coatings. It was indicated that the coating improve effectively the corrosion resistance of plain carbon steel.
Factor Analysis of Cracks Generated in 22CrMoH Steel Gear
Authors: Sheng Ji Sheng , Dai Su Jiang
Published: November 2010

Cracks is frequently generated in crown gear of main reducer of big modulus used in heavy duty truck after carbonizing and quenching. The heat treatment process and the pre-heat treatment before carbonizing, the carbonization process parameter and the quench treatment, all of which influence the component, structure and stress of the gear. In this paper, metallographic examination of the gear was taken after heat treatment with different process parameter, and the reasons that caused cracks in the 22CrMoH steel crown gear used in heavy duty truck after heat treatment was discussed. And strategies and methods are proposed as well.
Modeling Corrosion Property of High Chromium Cast Iron under H3PO4 Medium Condition Using Artificial Intelligence
Authors: Zhang Song Min , Xu Liu Jie
Published: November 2010

The components in slurry pump suffer serious corrosion and abrasion in the phosphorus fertilizer manufacturing process because they undergo corrosion of H3PO4 medium and impact of particles at the same time. Presently, High chromium cast irons are often used to produce the components in slurry pump. In order to reveal the corrosive law, the corrosion properties of high chromium cast iron with 26wt.%Cr content (Cr26) were tested under different H3PO4 medium concentration conditions. Using back-propagation (BP) neural network, the non-linear relationship between the corrosion weight losses (W) and H3PO4 concentration, corrosion time (C, t) is established on the base of the dealing with experimental data. The results show that the well-trained BP neural network can predict the wear weight loss precisely according to H3PO4 concentration and corrosion time. The prediction results reveal that corrosion weight loss rises linearly with increasing corrosion time. The H3PO4 concentration has obvious effect on corrosion property. When H3PO4 concentration is lower than about 0.5mol/L, high chromium cast iron has well resistance to H3PO4 corrosion. However, the corrosion resistance of high chromium cast iron rapidly decreases when the H3PO4 concentration exceed about 0.8 mol/L. It is suggest the high chromium cast iron be used under the condition of H3PO4 concentration of lower 0.8 mol/L.
Nanocrystalline NiO Thin Film Prepared by Sol-Gel Process
Authors: Zhao Sheng Li , Zhu Ji Ne , Wu Zhao Yang
Published: November 2010

The NiO thin film was deposited on the stainless and single crystal Si substrate by the dip-coating combined with thermal treatment. Thermal decomposition behavior of gel precursor, the structure, morphology and electrochemical properties of NiO thin film were characterized by TG-DSC, XRD, SEM, cyclic voltammetry and the constant current charge/discharge technology. The results show that the gel completely decomposes at 430°C to form the nanocrystalline NiO gradually and its crystal structure becomes integrity and particles largen as the increasing of the sintering temperature. The NiO film sintered at 600°C exhibits smooth surface, uniform, compact and free of cracks. At the cut-off voltage of 0-3V and the current density of 0.01 mA/cm2, its first discharge special capacity is 1285mAh/g and remains 650mAh/g after 300 cycles. In addition, the special capacity of NiO thin film still remains above 300mAh/g at large current density of 0.04 mAh/g after 300cycles exhibiting excellent electrochemical performance.
Tearing Analysis of Coated Fabrics under Mono-Axial Tensile Stresses
Authors: Liu Zhi Jun , Qian Xiao Ming , Chen Shou Hui
Published: November 2010

Being torn apart due to the slit initially cut on coated fabrics is the typical form of failure under mono-axial tensile load. The mono-axial centre slit tear test of coated fabrics was conducted to investigate the influences of slit orientation and initial slit length on the tearing strengths and corresponding tearing elongation. Given a fixed initial slit length, the tear strength and displacement both decreased with the increase of angle between the slit and the load direction. The tear strengths and corresponding elongations increased with the reduction of the slit lengths, when the slits inclining 30 ° and 60° to the mono-axial tensile load direction, respectively. However, the influence of slit lengths was insignificant when the slits were perpendicular or parallel to the load directions.
Effect of Various Nanoparticles on Friction and Wear Properties of Glass Fiber Reinforced Epoxy Composites
Authors: Wang Yong Kun , Chen Li , Xu Zhi Wei
Published: November 2010

The glass fiber (GF) reinforced epoxy (EP) composites filled by nano-Al2O3, nano-TiO2, nano-SiO2 and multi-walled carbon nanotubes (MWCNTs) were prepared. The friction and wear behavior of composites under dry condition were evaluated with block-on-ring friction and wear tester. The morphologies of the worn surfaces of the composites were analyzed by scanning electric microscopy (SEM). The results show that 0.5 wt% MWCNTs and nano-TiO2 can significantly lower the friction coefficient and specific wear rate of composites, respectively, while 0.5 wt% nano-SiO2 and nano-Al2O3 can slightly lower the friction coefficient and specific wear rate of the composites.
The Influence of Purification of Ethyl Acrylate on the Properties of Cement Matrix
Authors: Lee Chau , Wang Nian Fu , Xiem Meng Xun
Published: November 2010

This research mainly probes into the analysis of performance and assessment that ethyl acrylate polymer is applied to the cement matrix. The result shows that, before and after the purification, ethyl acrylate can increase the flowability of modified mortar, and with the increasing the dosage of polymer, the flowability is getting better. But if the dosage of hydrogen peroxide used to remove the residua alcohol is excessive, it is easy to cause high mortar viscosity, and that is unfavorable to the flowability. According to the setting time of the mortar under normal consistency, the result shows that the ethyl acrylate before the purification, has retarding effects on both initial and final setting time. With the increasing the dosage of polymer, it takes longer for both setting time. Besides, because hydrogen peroxide has accelerative effect, the purified ethyl acrylate can shorten the setting time of initial and final setting time. However, over dosage of hydrogen peroxide can easily lead to poor strength development in later stage. Using purified ethyl acrylate can overcome the shortcoming of lower strength of 3、7- day early stage. when hydrogen peroxide consumption is 0.5% of the total amount of acid and alcohol, the ethyl acrylate has the positive effect on improving the compressive strength. Finally, among the comprehensive assessments of the mortar testing results, EH0.5-0.1 has the significant effect of modification.
Experimental Study of Elastic Modulus of Crumb Rubber Plastic Concrete
Authors: Zhou Mei , Yang Xiao Ming , Song Kun
Published: November 2010

this paper got the compressive stress-strain fitting curve of crumb rubber plastic concrete, analyzed the influencing factors of elastic modulus of crumb rubber plastic concrete and found the influence law of specimen size and measuring distance to measured value of elastic modulus, through our experiments. The results of our experiments show that the method and operation of experiment strongly influence the measured value of elastic modulus of crumb rubber plastic concrete, but we can use the measures of step loading, screening and fitting curve to get the relatively exact measured value of elastic modulus of plastic concrete. And then, this paper analyzed a 16 sets of uniform experiment results with regression analysis method. As a result, we found the main influencing factors of elastic modulus of crumb rubber concrete are cement mixing amount, crumb rubber mixing amount and product of water-binder ratio and water reducer mixing amount, which the importance of them decreases progressively. Finally, this paper established the prediction equation of elastic modulus of crumb rubber concrete and found the connection of elastic modulus of crumb rubber concrete with specimen size and measuring distance.
Performance Evaluation of Large Stone Porous Asphalt-Rubber Mixture
Authors: Cao Wei Dong , Yao Zhan Yong , Shang Qing Sen , Li Ying Yong , Yang Yong Shun
Published: November 2010

Performance of Large Stone Porous Asphalt- Rubber Mixture（LSPARM）was studied in laboratory. Hamburg wheel tracking test, low temperature indirect tensile test and bending fatigue test were conducted to evaluate the high temperature performance of resistance to rutting, moisture susceptibility, low temperature performance of resistance to cracking and anti-fatigue performance of LSPARM and the test results were compared with the conventional large stone porous asphalt mixture using one polymer modified asphalt (control mixture). The test results indicate that LSPARM has better performance than the control mixture and it could be used as stress absorbing layers of semi-rigid base asphalt pavement.
Strategic Thinking of Construction Material Based on Ecology
Authors: Pang Hui , Zhao Bing , He Xiao Min
Published: November 2010

Chinese government has announced to the world that, the carbon emission will decrease by 40-45% in 2020, after the World Climate Summit in 2009. To ensure people’s living quality, while limit the green house gas emission, the construction industry - a big energy consumer - must endeavor to explore new construction method, research and develop new construction material and use new energy structure to make our promise come true.
Effect of Dry-Wet Circulation and Temperature Change on Properties of Polyurea Coatings
Authors: Lv Ping , Li Xin Mao , Huang Wei Bo
Published: November 2010

This paper mainly studies the mechanical properties and microstructure of polyurea coatings (SPUA) through the experiment of dry-wet circulation. The influence of different curing time of SPUA coating before and after the dry cycle of the mechanical properties and surface morphology changes were researched. Use the alternating temperature and low bending tests to research,the variation of temperature changes to the SPUA of different curing time. The result of the dry-wet circulation experiment shows that the tensile strength of cured 1d, 3d and 7d SPUA coating after 30d dry-wet circulation increased 9.6%、19.2% and 44.7% respectively, the tear strength increased 3.2%、5.6% and 47.3% respectively. The microstructure research shows the 7d cured SPUA coating after 30 times dry-wet circulation will reduce the holes and narrow the hole diameter in a certain degree. The temperature change experimental results show that during -20 ～50 alternating temperature process, the tensile strength of the coating appears to increase, 3d and 7d cured SPUA coating after 40d temperature alternating tensile strength changing rate is -14.2% and 9.8% respectively. Low-temperature bending test shows that the SPUA coating will not appear any cracks cracking phenomena after placed the coating in （-20+2 ）for 168h.
Experimental Research on Shape Retention of Tackified Woven Fabrics
Authors: Sun Fei , Chen Li , Zhang Yi Fan
Published: November 2010

The shape retention properties of tackified fabrics were studied in this article. And the effects of different concentrations’ tackifier content was analysed. Based on the present recovery performance test, a simple and feasible Instrument---Multi-angle measured recovery angle performance test was designed. The test results can clearly evaluate the deformation ability of the tackified woven fabrics.
Formation Mechanism of AlZrO and ZrAlON Phases in Al-ZrO2-N2 Systems
Authors: Wang Rong Lin , Sun Jia Lin , Bu Jing Long , Wang Zhi Fa
Published: November 2010

Al-ZrO2 composites were sintered in N2 atmosphere at 1000 oC, 1100 oC, 1200 oC and 1300 oC with ZrO2 and Al powders as raw materials. Formation mechanism of AlZrO and ZrAlON phases in Al-ZrO2-N2 systems were investigated by TG-DTA, XRD, SEM and EDS analyses. Results showed there existed new phases of ZrAl3O3N and AlxZr1-xO2-0.5x beside ZrO, ZrN, Al2O3, AlN and intermediate phases of Al7O3N5, Al8O3N6, ZrON, ZrON2, Zr7O8N4 in samples sintered at 1000 oC to 1300 oC. There existed process of mass transfer of ZrO2 in gas phase in samples at high temperature. Dynamics processes of ZrAl3O3N and AlxZr1-xO2-0.5x phases formed in N2 atmosphere at high temperature included contact reaction and ZrAlON sosoloid crystallization.
The Mechanisms of Epoxy Latex Coatings Curing at Ambient Temperature Comparison with Solvent-Type Ones
Authors: Guo Qing Quan , Li Da Guang , Guo Jian Wei , Chen Huan Qin
Published: November 2010

The performance and behavior of epoxy latex coatings are different from solvent-type ones.It is decided by the distinct curing mechanism. The solvent-type epoxy film obtained from epoxy resin and curing agent by homogeneous reaction, namely, the state of epoxy resin and curing agent is uniform. However, epoxy latex film made from epoxy resin emulsion or dispersion and water soluble amine by polyphase reaction. So the determination of potlife of epoxy latex can be showed by film gloss changes with residence time, dissimilar with solvent-type by the index of viscosity. The modern infrared spectrum measure shows that the epoxy groups in the dried epoxy latex film exist even if EEW to HAV proportion is 1.2:1. This also testifies the incomplete polyphase reaction mechanism of epoxy emulsion coating curing at ambient temperature.
High-Performance Rust Converter with a Formula Based on Polyphosphoric Acid and Tannic Acid
Authors: Fan Xi Qiu , Zhao Xiao Dong
Published: November 2010

This paper presents a high-performance rust converter whose formulation is based on polyphosphoric acid and tannic acid. In order to improve the performance of the product, active agent, catalytic agent, corrosion inhibitor, penetrating agent and wetting agent, etc., are added. Some results of accelerating experiment such as the A. C. impedance experiment are also presented, which demonstrate the high performance of the product. All ingredients in the product are cheap, easily accessible, and environment-friendly.
Effects of Vacuum Annealing on Microstructure and Magnetostriction of TbDy-Fe GMFs
Authors: Zhou Bai Yang , Luo Han Bin , Chen Si He
Published: November 2010

In this study, TbDy-Fe giant magnetostrictive thin films were firstly prepared by ion beam sputtering deposition (IBSD) method on water-cooled substrates, and then the films were annealed at different temperatures under vacuum condition. An Inductively Coupled Plasma Spectrometry, Scanning Electron Microscope (SEM), Scanning Probe Microscope (SPM), and Transmission Electron Microscope (TEM) were used to investigate the surface morphology and microstructure for TbDy-Fe GMFs. Besides, DWS type Ultra-precision Displacement Meter was used for measuring magnetostriction coefficient of the films by cantilever method. The results showed that TbDy-Fe GMFs of compact amorphous microstructure, smooth surface morphology, and high interfacial adhesion had been deposited under the fixed fabrication procedure. Moreover, as annealing temperature increased, microstructure of the films had been changed as following order: amorphous → amorphous + microcrystalline → nano-polycrystalline (crystallization temperature was about 400 ). It was noted that magnetostriction of TbDy-Fe GMFs could be drastically improved, particularly for low magnetic field magnetostriction sensitivity when annealed at about 400 (the value of λ was about 500ppm at 200KA•m-1).
Preparation and Characterization of the Tri-Channel Hollow Fiber Charged Mosaic Membrane
Authors: Deng Jian Mian , Liu Jin Dun , Zhang Hao Qin , Zhang Ya Tao , Cheng Dong
Published: November 2010

Charged mosaic membrane (CMM) has high water flux, low salt retention and high organic rejection. The tri-channel hollow fiber charged-mosaic membrane (CMM) was prepared by interfacial polymerization (IP). The tri-channel polysulfone (PSF) hollow fiber ultrafiltration(UF) membrane was used as the support membrane. Polyethylenimine (PEI), 2, 5-diamino-benzenesulfonic acid (DIA) and basic fuchsin (BF) were used as aqueous phase monomer. Trimesoyl chloride (TMC) was used as organic phase monomer. ATR-IR, scanning electron microscope (SEM) and gas sorption analyzer (GSA) were applied in structural analysis of CMM. The uniform design and SPSS were applied in membrane preparation and data analysis.The polymer ATR-IR spectroscopy shows IP occurrence between aqueous phase monomer and organic phase monomer. Polymer contains both sulfonate group and quaternary ammonium group. It show that the membrane has the feature of CMM. Regression equation was gained, and it shows the CMM retention would enhance with the concentration increase of DIA, PEI and SDS and decrease with concentration decrease of FB in experimental range. The composite layer can be observed from membrane SEM after IP. The CMM retention to NaCl, polyethylene glycol(PEG), Xylenol orange and Methyl chloride is12.4%, 90%, 96%,88% and 88.2% respectively.
Comparison of Hollow-Porous and Solid Carbon Fibers as Microwave Absorbents
Authors: Xie Wei , Cheng Hai Feng , Chu Zeng Yong , Chen Zhao Hui , Zhou Yong Jiang , Long Chun Guang
Published: November 2010

A series of polyacrylonitrile-based hollow-porous and solid carbon fibers were prepared by pyrolysis of polyacrylonitrile-based hollow-porous and solid fibers at the same condition. The microstructure, composition, surface electrical conductivity, electromagnetic parameters and reflectivity of carbon fibers were studied. The microwave absorbing properties of two kinds of carbon fibers as microwave absorbents were parallel investigated. Results show that the apparent density of the hollow-porous carbon fibers is lower than that of the solid carbon fibers due to their hollow-porous structure. The surface electrical conductivity of single solid carbon fiber is nearly 10 times that of the hollow-porous carbon fiber. The -10dB bandwidths of solid carbon fiber composites carbonized at 850 and 950°C are both 0GHz, while those of the corresponding hollow-porous carbon fiber composites are up to 3.05 and 2.62GHz, respectively. Results indicate that the microwave absorbing properties of the hollow-porous carbon fiber composites are better than those of solid carbon fiber composites.
Simulation of Fabrication for Single-Phase Al2O3 Ceramic Tool Materials at Different Fabrication Temperature
Authors: Fang Bin , Huang Chuan Zhen , Xu Chong Hai , Sun Sheng
Published: November 2010

The fabrication is a key process for the preparation of ceramic tool materials, which governs the mechanical properties of ceramic tool materials under the condition of the same compositions. A computer simulation coupled with fabrication temperature for the hot-pressing process of single-phase ceramic tool materials has been developed using a two-dimensional hexagon lattice model mapped from the realistic microstructure without considering the presence of pores. The fabrication of single-phase Al2O3 is simulated. The mean grain size of simulated microstructure by Monte Carlo Potts model integrated with fabrication temperature increases with an increase in fabrication temperature, which is consistent with the experiment results.
Experimental Research on Residual Strength of Recycled Aggregate Concrete under Compressive Fatigue Loading
Authors: Zhu Hong Bing , Li Xiu
Published: November 2010

To investigate the residual strength degradation of recycled aggregate concrete under fatigue loading, experiments were conducted to determine the functional relation between residual strength and the number of cycles. Fifty 100mm ×100mm ×100mm specimens of recycled aggregate concrete were tested under uniaxial compressive fatigue loading. Based on probability distribution of the residual strength of concrete under fatigue loading, the P-R-N curves are obtained based on test data, the empirical expressions of the residual strength corresponding to the number of cycles were obtained. The curves can be used to predict the residual strength with reliability.
The Preparation of TiO2 Film Loaded on Fiberglass Mesh and the Experimental Study on Its Photocatalytic Properties
Authors: Wang Man , Chen Wei , Liu Cheng
Published: November 2010

The TiO2 film loaded on fiberglass mesh was prepared by sol-gel method using butyl titanate as raw material, and the catalyst was characterized by scanning electron microscopy (SEM) and X-ray diffraction(XRD).The catalyst surface of loaded TiO2 can obviously observe solid particles and agglomeration to some extent, the crystalline phase was anatase, and no rutile was observed, the average particle diameter of TiO2 was 40nm,Under the ultraviolet light UV-C irradiation, the photocatalytic oxidation experiments of humic acid solution was conducted. The results showed that the prepared photocatalyst has a high photocatalytic activity, the UV254 degradation rate of humic acid solution in 60min reached 96.9%, but the degradation rate of TOC is only 57.3%, indicating that the organisms in humic acid can not be completely mineralized in photocatalytic oxidation process.
Investigation on the Property and Air Void Structure of Foamed Cement-Fly Ash-Steel Slag Concrete
Authors: Fang Yong Hao , Wen Quan , Dai Pin
Published: November 2010

The properties and void structures of foamed concretes prepared from portland cement, fly ash, steel slag and foam agent were investigated. The results show that substituting cement by steel slag resulted in little change in dry bulk density, but reduced the compressive strength; on the other hand, when cement was substituted with fly ash, though the dry bulk density decreased, the compressive strength increased as the proportion of substitution increased from 30%to 45%. Increasing the volume fraction of the foam decreased greatly the dry bulk density and the compressive strength, and reduced the thermal conductivity as well. Image analysis on the air void structure shows that the larger air void fraction, the larger average void size and lower void roundness. There is a close correlation between the average mean Feret diameter and the average shape factor.
Preparation and Properties of PLLA-co-bis A/VMT Nanocomposites
Authors: Bai Ya Li , Xu Hong , Mao Zhi Ping
Published: November 2010

Poly(L-lactic acid)-co-bisphenol-A epoxy resin/vermiculite nanocomposites（PLLA-co-bis A /VMT）were prepared by in-situ melt polycondensation of L-LA in the presence of amino-modified vermiculite. The fourier transform infrared (FTIR) spectra were used to investigate molecular interactions between the modified vermiculite and PLLA. The detailed thermal property and crystallization behavior of samples were studied by using polarized optical microscopy (POM), differential scanning calorimetry (DSC) and thermogravimetric analyzer (TGA). The result indicated that the thermal stability, overall crystallization rate and spherulitic texture of PLLA-co-bis A were strongly influenced in the presence of vermiculite particles.
Anti-Shear Reliability Analysis of Existing Pretension Prestressed Concrete Beam Bridges in the Corrosion Environment with Acid Rain
Authors: Chen Feng , He Shuan Hai , Hu Da Lin , Huang Bing Yuan
Published: November 2010

Under the acid rain corrosion condition, the shear-bearing capacity of the pretension prestressed concrete beam will attenuate gradually with the stirrup corrosion and concrete deteriorate. Moreover, the stress corrosion cracking failure and the bond force degradation of the prestressed wires that caused by the aggravated corrosion mediator ingress will further increase the shear failure risk of the pretension prestressed concrete structure without any symptom. The paper presents a shear bearing capacity calculation model of the pretension prestressed concrete beam bridge and discuss the time-variation model of the stirrup corrosion considering the effective prestress attenuation under the acid rain corrosion condition. The analysis method on anti-shear reliability of existing pretension prestressed concrete beam bridges under the sodium sulfate corrosion condition is proposed then. The method will be used in the durability and safety evaluation of the shear-bearing capacity of the existing pretension prestressed concrete beam bridges in the corrosion environment with acid rain.
Study on the Performance of Buckling-Restrained Brace with Low Yield Strength Steel
Authors: Xu Yan Hong , Li Ai Qun , Huang Ya Na
Published: November 2010

The buckling-restrained braces(BRBs) with low yield strength(LYS) steel make good use of ductility and hysteretic energy dissipation of the low yield strength steel and are gradually applied in structural vibration. To foster BRBs with low yield strength steel in China mainland, the domestic LYS160 was used in BRB. The cross section was a simple shape. A static cyclic test was carried out, and the finite element analysis was conducted. The results show that the BRB with domestic low yield strength steel has good ductility, hysteretic energy dissipation and resistance to fatigue. A shaped cross section is simple and easy to promote application in China mainland.
Synthesis and Polymerization Kinetics of Copolymer Styrene-Vinyltrimethoxysilane by Emulsifier-Free Emulsion Polymerization
Authors: Zhao Hong Chi , Gao Ling Ling , Gao Shan Shan , Shi Jing
Published: November 2010

Copolymers of styrene (St) and vinyltrimethoxysilane (VTMS) have been synthesized by emulsifier-free emulsion copolymerization using ammonium persulfate (APS) as initiator. Acrylic acid used as functional monomer was also added into the emulsion. The effects of varying the concentrations of initiator and VTMS as well as the polymerization temperature on the polymerization conversion and rate were investigated in detail. The copolymer was characterized by Fourier transform infrared spectrometer (FTIR). Copolymerization of VTMS with St was confirmed by the appearance of an absorption peak between 1000 cm-1 to 1200 cm-1 (due to Si-O-C bonds) in the IR spectrum. The siloxane segments in the copolymer chain underwent hydrolysis and self-condensation, resulting in a change in the structure of the copolymers from linear into a cross-linked network. As a result, the organic and inorganic hybrid materials were formed. The polymerization rate increased with increasing polymerization temperature, molar concentration of initiator and decreased with increasing molar concentration of VTMS. The apparent activation energy and kinetic features of the polymerization system were also obtained.
Synthesis and Characterization of Poly(Styrene/n-Butyl Acrylate/Vinyltrimethoxysilane) by Emulsifier-Free Emulsion Polymerization
Authors: Zhao Hong Chi , Gao Ling Ling , Li Qian Feng , Guo Juan Li
Published: November 2010

Copolymers of styrene (St), n-butyl acrylate (BA) and vinyltrimethoxysilane (VTMS) have been synthesized by emulsifier-free emulsion copolymerization using ammonium persulfate (APS) as initiator. Acrylic acid used as functional monomer was also added into the emulsion polymerization system. The effects of varying the concentrations of initiator and VTMS as well as the polymerization temperature on the polymerization conversion were investigated in detail. The copolymer was characterized by Fourier transform infrared spectrometer (FTIR). Copolymerization of VTMS with St and BA was confirmed by the appearance of an absorption peak between 1000 cm-1 to 1200 cm-1 (due to Si-O-C bonds) in the IR spectrum. The siloxane segments in the copolymer chain underwent hydrolysis and self-condensation, resulting in a change in the structure of the copolymers from linear into a cross-linked network. As a result, the organic and inorganic hybrid material was formed. The water absorption of emulsion decreased with increasing VTMS concentration. The polymerization conversion increased with increasing polymerization temperature, molar concentration of initiator and decreased with increasing molar concentration of VTMS.