bluuebunny/crossref_metadata_2025 huggingface dataset:
Simulation of Cold-Formed Steel Beams in Global and Distortional Buckling
Authors: Vatin Nikolay , Sinelnikov Aleksei , Garifullin Marsel , Trubina Darya
Published: September 2014

This article provides the numerical elastic buckling analysis of simply supported cold-formed lipped channels subjected to pure bending. A methodology for computing simulation of a new type of thin-walled thermo-profile (reticular-stretched) is developed. For flexural elements buckling modes and values of critical force are calculated. FE simulation evaluates the influence of web height and span on the critical load and buckling modes for cold formed beams of different lengths.
Study on Fluid-Solid Coupling for Vibration Characteristics of Stiffened Plate
Authors: Zhu Li , Song Hong Bao , Yao Xiong Liang , Miao Xu Hong
Published: September 2014

In this paper, the vibration characteristics of plate and stiffened plate in the flow field are calculated by employing fluid-solid coupling method. The wet-frequency and wet-mode numerical computing results are analyzed. The influence of boundary condition, edge length ratio and depth of water on wet mode and wet frequency are studied. A mixed finite element-boundary element method is adopted in the numerical calculation, which makes the added water mass matrix calculation be limited to the liquid-solid interface. Thereby, the calculated amount is significantly reduced and the calculation efficiency is increased.
Optimum Design on Gearbox Casing of Twin Screw Pulping Extruder Based on Finite Element Method
Authors: Wang Ping , Lin Jian Tao , Huo Dong Chen
Published: September 2014

Usually the gearbox casing of twin screw pulping extruder was designed by experience and greater weight. In order to reduce the casing weight under the premise of ensuring its stiffness and strength, firstly the casting lower box and the weakest axle in the casing were analyzed with finite element method by ANSYS software. And then the optimum design was carried out to take the minimum volume as an objective function. Finally, the welding casing has been designed as considering the manufacturing cost. The results show that the weight of the casting lower box after optimization is 22.95% lower than that of the experience design, and the weight of the welding part is 19.09% lower than that. The work has certain significance for optimum design of gearbox casing.
Mechanical Properties of Soil under Vehicle Load
Authors: Xu Rui Liang , Yang Tao
Published: September 2014

Based on the analysis of relevant characteristics of the traffic load, explores the impact of static and dynamic vehicle type, shaft type factors,and cars on the road, down to analyze the stress level in the soil loads -deformation relationship Through theoretical analysis, research, and future prospects, the measures proposed to solve the problem, come to study the mechanical properties of the program under the vehicle load soil and make the outlook for future work in this area terramechanics.
Capabilities of the New Element of the Stress-Strain Model
Authors: Nikolskiy Sergey , Kazderko Mikhail
Published: September 2014

Stress-strain model is an appliance for research of the strength and deformations. It can be used to solve technological problems in the production of materials. Rheological element is a part of stress-strain model. There are some disadvantages of existing rheological elements. They can’t be applied for research of the material strength and some experimental facts which are observed for many materials. The aim of the new element is to eliminate these disadvantages. The new rheological element includes the matrix and the puncheon. It differs from its analogues by configuration and characteristics of its parts. If the value of the friction coefficient between the matrix and the puncheon is not zero and greater than the tangent of the angle between the axis and the matrix on the section with the variable cross-section, the puncheon is jammed by frictional force under loading. When unloading and subsequent loading the puncheon retains a permanent deformation until the load exceeds the maximum value during the previous cycle. If the above-mentioned angle matrix is equal to zero, displacement of the puncheon does not require increasing of the load within this section. The plastic flow is observed. Deformation can be accompanied by strengthening on the section where the value of the friction coefficient is greater than the above-mentioned tangent. Fragmentation of the element is possible on this section. Thereby the new rheological element permits to relate different types of deformations of simulated solid. In other words, it allows researching the strength of material.
A Coal Mine Hydraulic Support Design and Type Selection of Medium Thick Coal Seam
Authors: Zhang Li Rong
Published: September 2014

Design and selection of hydraulic support is the core of coal mine fully mechanized mining equipment selection and matching, determine the hydraulic supporting strength Using the numerical simulation method and shallow buried depth of roof structure of theoretical calculation method, determines the necessary technical parameters such as the support frame, the bracket height and the bottom plate pressure According to the coal seam thickness and coal seam structure, which has the instructive meaning in application.
Analysis on Load Spectrum of Bogie Frame for High-Speed EMU
Authors: Wang Yu Guang , Zhang Da Fu
Published: September 2014

The load spectrum, on which there is not a thorough research, is the key factor of the safe operation of EMU. A dynamic model of some high-speed EMU is established and the load time history of main load on frame is obtained through simulation and analysis based on the Beijing-Tianjin route. The load spectrum for main load is calculated by rain-flow counting, the crossing contrast of load spectrum in basic and fault conditions is proceeded as well, the extent of impact of all kinds of fault conditions to bogie main load is analyzed and a brief introduction of estimation method of the frame fatigue life is put forward in this paper.
Characteristics Analysis of the Vibration Power Flow in a Simply Supported Laminate Composite Plates
Authors: Zhang Xiong , Wu Jin Wu , Lin Zhi Ming
Published: September 2014

The vibration power flow characteristics of the fully simply supported laminate structure subjected to different excitation frequencies was discussed. Based on the layer-wise theory with finite element models, the effects of panel orientation angle, elastic modulus ratio and width-depth ratio on the power flow of the laminated composite plates were discussed, and the corresponding power flow - frequency streamlines were given. From present results, it can be demonstrated that the panel orientation angle and width-depth ratio have a greater impact on vibration power flow. Further, the information above can be used to control the noise level of the structural vibration.
Reliability Distribution Law and Statistics Analysis for High-Speed EMU
Authors: Cui Zhi Guo , Dong Hao
Published: September 2014

The reliability design method is considered based on the EMU application in our country. It is verified that the vehicle reliability obeys the exponential distribution according to the statistical testing principles and practical data statistics of some high-speed EMU, in addition, the reliability after a period of time of operation, or to say, the operational time which meet demand of the certain reliability requirement, is predicted. The reliability assessment for the EMU operating for a period of time is proceed on the basis of the suggestion table of failure rate levels obtained through quantities of statistics. Apart from this,suggestions about reliability design is proposed based on the given condition of failure rate levels. The method can be used as one of reliability assessment indicator of EMU in the future.
Static Aeroelasticity Solution for Divergence Dynamic Pressure of Wing
Authors: Yu Li , Lv Bin Bin , Guo Hong Tao , Yan Yu , Zha Jun , Lu Bo
Published: September 2014

This paper introduces the solution for calculating the divergence dynamic pressure of wing under subsonic speed based on static aeroelasticity. Several groups of results (q ~ θ values) are calculated and the divergence dynamic pressure can be obtained through two methods, i.e. making q ~ θ value curves or deducing divergence dynamic pressure formula based on the characteristics of equilateral hyperbola. According to several groups of calculated data, the error caused by the two methods is minor and can be ignored basically.
The Design and Research of Quadcopter Frame
Authors: Yang Zi Jian , Wei Pan
Published: September 2014

Quadcopter is a novel appearance, superior performance VTOL aircraft, which has a simple structure, flexible operation, high load capacity and other characteristics, have important civilian and military value. This paper describes the status of research the unmanned aircraft, the key technology and application prospect and gives the overall design of quadcopter frame. First, according to design, we should build quadcopter frame models, then analyses the frame with ANSYS finite element software. Select the necessary materials and structures that meet the strength and stiffness the system needs.
Analysis Design and Roof Motion Track Simulation for Gob-Side Entry Retaining Hydraulic Support
Authors: Wang Xin Ya , Shang De Yong , Liu Na , Li Song Yang , Fan Xun
Published: September 2014

The reliability of formwork support is directly related to gob-side entry retaining success. In this paper a dual function of supporting and filling formwork support is designed. Use SolidWorks software build 3D modeling and virtual assembly, The establishment of a movement model of the anti-four-bar linkage formwork template using numerical methods and get the motion trajectory of the roof. It has been verify that the anti-four bar linkage design of the hydraulic support is feasible.
Wind Tunnel Studyon Vortex-Induced Vibration Characteristics of Long-Span Suspension Bridges with Single Cable Plane
Authors: Yu Huang
Published: September 2014

For modern long-span bridges, both the optimization of aerodynamic shape and the increase of torsional stiffness according to the result of the wind tunnel experiment could avoid the flutter instability.Vortex-inducedvibration with relatively large amplitude happens easily at low wind speeds. In this paper, based on wind tunnel experiment, by studying on the vortex-induced vibration characteristics of a long-span suspension bridge with single cable plane, aerodynamic measures for easing the vortex-induced vibration are given.
Design and Realization of the Sponge Membrane Winding System
Authors: Zhu Hao , Guo Yong Hong , He Jin Long
Published: September 2014

The sponge membrane winding quality depends on the tension intensity and stability during the winding process. Taking the problem of winding system at dynamic procedure, this paper analyzed the dynamic relationship among velocity, tension and diameter of winding coil. On this basis, the design controlled invariable tension via changing the RPM of the motor and the PID controller ,the feed-forward decoupling controller also be utilized to compensate the tension simultaneously via adjusting the RPM of the motor. The simulation presents that the design has good dynamic responses and strong anti-interference capacity.
Microscopic Layout Design of Metamaterial
Authors: Du Jian Bin , Yang Rui Zhen
Published: September 2014

A novel design method based on layout evolution of the periodic micro unit cell of the metamaterial is presented for improvement of the mechanical behavior of the composite structure. The macro properties of the metamaterial depend strongly on its microscopic layout, and hereby may possibly be improved by microstructural design. Topology optimization model and the solution method based on inverse homogenization process are developed to find the best layout of the microstructure. The proposed method may be applied to improve the static and vibro-acoustic behavior of the structure, which is validated by several numerical examples.
Kinematics Analysis of Offshore Flexible Riser Fatigue Testing Machine
Authors: Zhang Xin Jie , Chang Zong Yu
Published: September 2014

Kinematics model is established for offshore flexible riser fatigue testing machine using vector analytical method, and motion simulation was carried out by ADAMS software. The motion curves of driven member were got，correctness of design results were proved through comparing with theoretical value.
Mechanical Analysis on the Main Components of Backward Rotary Transplanting Mechanism in Wide-Narrow Row Planting
Authors: Wang Ting Ting , Zhao Feng Qin , Shi Chang Jiang , Yang Fan
Published: September 2014

For the problem of the design on the main components of backward rotary transplanting mechanism in wide-narrow row planting, finite element method based on SolidWorks Simulation was applied to analyze it. In the analysis, the defects in the design were discovered. By improving these defects, the aim of optimization design was achieved. This analysis and design method can effectively avoid the defects caused by conversion between different softwares, which has higher practical value.
The Dynamic Characteristic Analysis of Vibration System for Longitudinal and Torsional Ultrasonic Vibration Honing
Authors: Zhao Hong Bing , Shen Xue Hong
Published: September 2014

The tool’s unique movement trajectory in longitudinal and torsional ultrasonic machining technology can help chip extraction. Cutting liquid can offer good lubrication, cleaning and cooling. It also can prolong tool’s life, improve the processing quality and processing efficiency, so it is widely used in precision and ultra-precision machining. It builds the model of ultrasonic vibration system, based on the motion analysis of longitudinal and torsional ultrasonic vibration honing. In addition, mode analysis, transient dynamic analysis and harmonic response analysis are carried out by means of finite element analysis software ANSYS. Using graphics and curve in the postprocessing module describe the results of numerical simulation. It can provide powerful model and theoretical basis for the structure design and performance optimization of ultrasonic vibration system, which is used for longitudinal and torsional ultrasonic vibration honing.
Structural Optimization of Shield Machine Cutterhead Applied in Sandy Cobble Stratum
Authors: Wu Li , Zhang Jia Yuan , Guan Tian Min
Published: September 2014

With the aim of probing the optimal cutterhead structure for sandy cobble stratum in Beijing metro, four typical cutterhead structure are presented. The load on the cutterhead is calculated. The finite element models of cutterhead with thickness of 350 mm, 400 mm and 500 mm for each structure style are established respectively. By analyzing the stress distribution for each model, we find that the maximum stress of spoke-style cuttehead are lower than that on the board-style cutterhead; the structural properties of cutterhead with straight corbel are better than that with oblique corbel. Finally, the optimal cutterhead structure and size for sandy cobble stratum is selected.
Study on the Creep Properties and Microstructures of EW75 Alloy
Authors: Li Yong Jun , Li Xing Gang , Zhang Kui
Published: September 2014

The creep properties and microstructures of the aged (220°C, 6h) EW75 magnesium alloy at different temperature and of stress conditions were studied. The experimental results show that, the deformation temperature and deformation rate have visible influence on flow stress curve of EW75 alloy. When the deformation temperature was constant, the stress rheological increases with the strain rate increasing. When the deformation rate was constant, the flow stress decreases with the deformation temperature increasing. When the deformation temperature was low or deformation rate was quickly, the shear fracture was along 45° direction. At low temperature and high strain rate conditions, the recrystallization of EW75 alloy was not obvious. When raising the temperature and decreasing deformation rate, the dynamic recrystallization ratio was improved markedly. The generating and moving of dislocations during deformation were main factor to determine the final microstructures. At 100MPa, 200°C conditions, the creep rate control mechanism of EW75 alloy was dislocation slip by solute drag. Precipitation phases coarsening was the main reason that the creep properties of EW75 alloy decreased.
Study on Tribological Performance of Al2O3 Particle Reinforced the Al-Sn Bearing Alloy
Authors: Sui Bin , Zeng Jian Min , Chen Ping , Liang Li Hua , Gan Wu Kui , Lu Jin Bo
Published: September 2014

In order to improve performance of Al-Sn bearing alloys, a new Al2O3/Al-Sn composite was fabricated through in-situ reaction between Al and SiO2. A study has been conducted to investigate tribological performance of the composite on MMW-1 Computer controlled vertical universal friction and wear testing machine. The results show that Al2O3 and Si particles are mainly distributed in the grain boundary and particles are often coated by a thin Sn layer. Friction coefficient of Al2O3/Al-Sn composites is decreased with Sn additions up to 21wt. %.
The Phase Change Study of Titanium Concentrate during Heat Treatment
Authors: Wan Shu Quan , Zou Min , Lan De Jun , Xu Zhong , Ma Guang Qiang
Published: September 2014

Titanium concentrate mainly contains the elements, Ti, Fe, Si, Ca, Mg, Al, P, S, Ba, Zr and etc, by XRF. Its original main phase was very likely FeTiO3 by XRD. After treated at 673K for 10h, the phases had only slightly changed, with a little weight gain (about 0.32%). After treated at 1273K for 10h, its phases had been changed to very complex solid solutions, which may contain Fe2TiO5, Fe3Ti3O10, TiO2 (rutile), Fe2O3 and etc, with an obvious weight gain (about 3.35%). The phase change may be caused by the reaction of titanium concentrate with oxygen. Obvious relative loss of the main elements was found during heat treatments especially sulfur. Most of sulfur had been volatilized during the heat treatment at 1273K. It may be conducive to better development and utilization processing of titanium concentrate.
Thermodynamic Model of Calculation of Sulfur Distribution Ratio between B2O3-Containing Slag and Molten Steel
Authors: Zhu Xiang , Li Yang , Fan Xiao Jian , Wang Hong Ming , Li Gui Rong
Published: September 2014

A thermodynamic model of calculation of sulfur distribution ratio between B2O3-containing slag and molten steel has been developed on the basis of the ion and molecule coexistence theory. Based on the model, the effects of B2O3 content and slag basicity on the sulfur distribution ratio in 1873K were investigated respectively. The results indicate that the sulfur distribution ratio decreased with increasing the content of B2O3, and when the content of B2O3 exceeds 6%, the sulfur distribution ratio was lower than 2.0. Therefore, in order to ensure the desulphurization ability of slag, the content of B2O3 should be controlled at about 6%. Moreover the sulfur distribution ratio can be increased by increasing the slag basicity.
Study of the Solid-State Joining Process for Endless Hot Rolling
Authors: Dai Yong Juan , Zhang Xiao Li
Published: September 2014

In this study, the joint strength and microstructure of carbon steels welded by an super-deformation joining process in air were investigated. The two block of model steels are overlapped and heated. The steels are welded with 1000% deformation at approximately 1000°C.The joint strengths are evaluated by uniaxial tension testing. The joint microstructures and fractured surfaces are investigated with OM and SEM. The results revealed that the mechanical properties of joint are close to the matrix’s, the grains adjacent to the interface are merged into one grain, which indicates that both blocks are soundly joined,fracture surface was covered with dimple indicating ductile fracture occurred. Joint fracture behavior is initiated by the brittle fracture of scale inclusions and growth around the internal oxides. Surface scale is the most important factor of sound joining.
Thermal Analysis on Solidification Behaviors of Hypoeutectic Grey Iron in Lost Foam Casting
Authors: Xie Ming Guo , Zhu Chang An , Zhou Jian Xin
Published: September 2014

In this paper, the solidification behaviors of hypoeutectic grey iron under different vacuum conditions in lost foam casting (LFC) were discussed by using thermal analysis method. In order to reveal unique solidification characteristics in LFC, green sand casting (GSC) is introduced as comprehensive study. To comprehensively investigate solidification process, several groups of continuous cooling curves were taken from the geometrical center of the different thickness section (from 5mm to 45mm) of the stepped test bar in practical pouring experiment for the above two processes. And the first derivative of these cooling curves and key temperature points were evaluated. In this paper, through more complete comparative analysis of cooling curves, vacuum environment in LFC would not only change the filling characteristics of melt, but also importantly effect on the further solidification of melts, thereby effect on solidification processes and structural feature of hypoeutectic grey iron.
Influence of Vacuum on Nano-Diamond Cathode Field Emission Characteristics
Authors: Yang Yan Ning , Zhang Zhi Yong , Li Wei Xia , Zhai Chun Xue , Liu Qiao Ping , Zhang Fu Chun
Published: September 2014

The test of nano-diamond cathode field emission characteristics was conducted by changing the vacuum, the influence of vacuum change on nano-diamond field emission characteristics was also explored. It was found that under the condition of low vacuum, nano-diamond field emission turn-on field is relatively high, as the vacuum increases, turn-on field decreases gradually, and current density increases. When system vacuum reaches to above 10-4Pa level, turn-on field becomes stable, the stable value is 4.5 V/μm; and current density also becomes stable, the stable value is 117 μA/cm2; the luminescence effect of anode which is 200μm distant from the cathode in the vacuum chamber also becomes stable. Results show that 10-4Pa is system vacuum limit parameter of stable working of field emission display, the experiment provides a basis to the design and manufacture of nano-diamond field emission display.
Crystallisation and Dynamic Mechanical Relaxation Behavior of High Density Polyethylene/Isotactic Polypropylene Blending Monofilaments
Authors: Yu Wen Wen , Shi Jian Gao , Wang Lu Min
Published: September 2014

The effect of the iPP content on crystallisation, dynamic mechanical relaxation behavior and mechanical properties for high density polyethylene/isotactic polypropylene (HDPE/iPP) was investigated. It was found that crystallinity of HDPE decreased while crystallinity of iPP increased with the increase of iPP content. Two relaxations, namely,γrelaxation associated with amorphous phase of HDPE andαrelaxation at positive temperature related to crystalline phase were detected, respectively.γrelaxation of HDPE/iPP blending monofilaments shifted to a higher temperature whileαrelaxation temperature remained unaffected with raising the content of iPP component. The mechanical properties were significantly affected by the iPP content. Thus, an efficient method to improve the mechanical properties of HDPE monofilaments by introducing iPP component was established.
Effect of Processing Aids on the Performance of High Filled Polypropylene
Authors: Cao Yun Ping , Tu Yu Zu , Li Juan
Published: September 2014

In this paper, we mainly introduces the influence of the processing aids TR131 which namely the lubricating and dispersion agents on the properties of high filled polypropylene. The experiment compared the melt flow rate, tensile strength, bending strength and impact strength of the high filled polypropylene with processing aids TR131 and without it. The results show that high filled polypropylene with Calcium Carbonate could improve the bending strength and impact strength of the pure polypropylene, but the melt flow rate and tensile strength decreased. Incorporation of processing aids TR131 could improve the melt flow rate and the tensile strength of the high filled polypropylene.
Mesoscale Simulations of the Polymer Blends Based on the Mesoscopic Dynamic Method
Authors: Zhang Min , Zhang Guo Fang , Jia Yu Xi
Published: September 2014

The mesoscale simulation of polymer blends, Polypropylene (PP) and Polyamide12 (PA12), was calculated by Mesoscopic Dynamic method (MesoDyn). The free energy density, the order parameters and the density profiles were got by the simulation. The evolvement of the phase status was analyzed based on the free energy density and the order parameters. Using density profiles, the kinetics of phase separation was examined and the phase separation behavior was observed. Results showed that mesoscale simulation can be used to determine phase separation of sparingly miscrible polymer blends.
Research on Static Mechanical Properties of Metal Rubber by Wire Mesh
Authors: Cheng He Zhang , Wang Peng , Zou Guang Ping
Published: September 2014

Metal rubber material is a mesh structure woven by wire (metal rubber called MR), a new type of isolated-vibrated material with elastic rubber property [1, 2]. Static mechanical properties of MR are discussed in this paper. First of all, this paper introduces load-displacement function of micro element spring. And a constitutive model of MR is proposed. Secondly, this paper discusses how different parameters such as wire diameter and relative density influence energy dissipation. Also, compared the theoretical results with the experimental results in order to test the accuracy of the theory.
Modeling and Actuation Performance Analysis of Conically-Shaped Dielectric Electroactive Polymer Actuator
Authors: Zhu Yin Long , Zhou Hong Pin , Wang Hua Ming
Published: September 2014

Dielectric elastomer actuators (DEAs) represent one class of electroactive polymers that have already demonstrated excellent performances and show potential applications in many fields. In this paper, we present a simplified conically-shaped dielectric elastomer actuator model to explore the effects of various preloads and actuation voltages on both the actuation displacement and force output of DEA. The strain energy potential of Yeoh is used and the viscoelasticity is also taken into account. Using the developed model, the numerical results of DEA including the actuation displacement, the distribution of the principal stretch ratios and principal stresses in the membrane and the force output can be obtained. With different preloads and actuation voltages, the actuation characteristic of conically-shaped dielectric elastomer actuator is explored experimentally and validates the results determined from the proposed model. The proposed model can be used for the design and optimization of conically-shaped dielectric elastomer actuator.
Study on Preparation of Biodegradable Polyurethane Foam
Authors: Zhou Cai Long , Li Yu Feng , Wan Shu Quan
Published: September 2014

Biodegradable polyurethane foam (PUF) was prepared by using tung oil and starch as the modifiers, they were mixed with polyether polyol and some other reaction auxiliary agents, and then reacted with toluene diisocyanate (TDI). The structure and thermal stability of products were analyzed based on SEM and TG, and the soil burial method was used to investigate the biodegradability of products. The results indicated that polyurethane foam modified by tung oil and starch has good thermal stability, good mechanical properties and good biodegradability. The degradation rate of PUF modified by 5: 2 of starch/ tung oil was 38% after 120 d.
Design of Discontinuous Fiber Reinforced Injection Molded Polymer Matrix Composite Parts
Authors: Major Zoltan , Reiter Martin
Published: September 2014

Injection molded discontinuous fiber reinforced components are widely used in many demanding engineering applications and are exposed to a complex combination of thermo-mechanical loads. Mean field homogenization approach was successfully applied for predicting the global stiffness behavior over wide part geometry complexity, fiber orientation distribution (FOD) and loading situations including loading rate and temperature dependence. The prediction of the component strength, however, is significantly more complicated and requires additional and theoretical considerations as well as the application of various numerical tools and sophisticated experiments. To overcome above difficulties the MFH technique was extended with the first pseudo grain failure or damage (FPGF or FPGD) approach proposed by the research group of Doghri [1] elaborated in detail using short glass fiber reinforced PP-GF in the PhD Thesis of Reiter [2] and shortly described in this study.
Molecular Dynamic Simulations on the Compatibility of PP/PA12 Blends
Authors: Zhang Min , Zhang Guo Fang , Jia Yu Xi
Published: September 2014

The compatibilities of polymer blends, Polypropylene (PP) and Polyamide12(PA12), was simulated by molecular dynamics (MD) simulations. Density, cohesive energy density (CED) ,and solubility parameters (δ) of pure substances and PP/PA12 blends were calculated by MD simulations with the COMPASS force field for the prediction of polymer blends compatibility . Results showed that PP/PA12 is not miscrible by comparing the difference in the solubility parameter value ( Δδ), radial distribution function value. The predictions agreed well with the experimental results. So it can be showed that MD simulation is a valid method to provide information on miscibility of polymer blends.
Measurement and Evaluation of Ferrite Surface Crack
Authors: Wan Shu Min , Zhao Wang , Li Guang You , Chen Shuai
Published: September 2014

An acquisition of ferrite surface images has been taken with a LY-WN-YH Hyper-depth measurement system, from which the crack condition was analyzed with MATLAB. Based on the contradistinction between experimental data from ferrite work pieces of different quality, a preliminary conclusion has been drawn that the surface quality of ferrite materials has a direct link to the quantity and length of the crack on them. By measuring the quantity and length of the crack, an initial criterion was obtained for judging the surface quality of ferrite.
Absorption Spectrum of Carbon Nanotubes
Authors: Zhang Qing Hua , Sun Hong Hui , Wang Hong Xia
Published: September 2014

Carbon nanotubes are very typical nanomaterials, because the electron π of carbon nanotubes is restricted by the quantum size, the energy bands of the electron π are discontiguous and the characteristic of its energy level is divisive. The electron π can absorb the photon and makes transition from low energy level to high energy level, so it has the characteristic of wave-absorption . Based on the theory of quantum mechanics and the atomic structure of carbon nanotubes, the electronic energy bands and absorption spectrum of carbon nanotubes are analyzed in this paper, the results show that carbon nanotubes of different size correspond with absorption spectrum of different wave bands, and the computational results are afforded for the bases of designing wave-absorption materials.
Experimental Research of Damage Occurred on Large Cross-Section Conductor by Different Patterns of String Pulley
Authors: Peng Fei , Zhou Hai Ying , Jiang Ming , Tang Guang Rui
Published: September 2014

To study conductor damage induced by different patterns of string pulley in process of tension stringing, damage experiment is performed on string pulleys with multi wheels and single wheel. Damages occurred on conductor by two different kinds of string pulleys are analyzed. Results show that there are no significant decrements in strength of conductor with trapezoidal conductor when it is passing through different patterns of string pulley. It indicates that damages on conductor with trapezoidal conductor caused by both types of string pulley are similar. It is also found that average strength of conductor with circular conductor decreases 1.60% and 2.99% when conductor is passing through string pulley with single wheel and multi wheels over twenty times. It is concluded that strength damage on conductor with circular conductor induced by multi wheels is a little larger than that by single wheel
Effect of La2O3 Addition on the Microstructure and Mechanical Properties of TiC-Based Cermets
Authors: Xie Jia , Li De Kai , Wang Lian Chao , Xi Yun
Published: September 2014

TiC-based cermets with four different components of La2O3 content were prepared via vacuum sintering to investigate the effect of La2O3 addition on the microstructure and mechanical properties. The microstructure and phase structure were investigated by XRD, SEM, EDS and the mechanical properties were measured. Experimental results show that TiC-based cermets with La2O3 addition were also a typical core-rim structure but did not form a new phase. Along with the increase of La2O3 content, the density of TiC-based cermets was reduced, EDS analysis revealed La2O3 was partly dissolved in the Mo/Ni binder and hindered dissolution and separation of carbides. A moderate amount of La2O3 can favor the microstructure refinement and improve its mechanical properties in the form of La2O3 particles embedded in Mo/Ni particles. Compared with undoped sample, the cermets doped with 1 wt.% La2O3 showed optimum comprehensive properties: the bending strength of 1041.4 MPa, Vickers hardness of 13.19 GPa and the fracture toughness of 14.18 MPa• m1/2.
Important Components Analysis of Ceramic Rapid Molding Machine
Authors: Gong Xiu Duan , Wen Zhou , Zhang Jun Ling
Published: September 2014

The digital design of mechanical products is usually first reference existing parts, drawings, and experience to make original design data and design requirements, according to the design of digital model is set up, after an analysis of the finite element model according to the analysis results contrast design goal to design or structure parameter changes, to the expected design purpose. Analysis of the product is an essential part of product design.
Microstructure Analysis of Al2O3 Ceramic Coatings Composite Steel Plate Prepared by Self-Propagating High-Temperature Synthesis
Authors: Wang Jian Ping , Zhang Yu , Ni Hong Jun , Zhu Yu
Published: September 2014

This manuscript was used to test feasibility that the Al2O3 ceramic composite steel plate was fabricated by Self-propagating High-temperature Synthesis (SHS).The Al2O3 ceramic coatings were prepared on the steel plates.The ceramic coatings had been subsequently characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS) attachment. The results showed that the ceramic coatings could be divided into three layers called Al2O3 ceramic layer, Fe/Al2O3 blending layer and iron layer from the roof to the bottom. Al2O3 ceramic layer had many porosities and low density. The tissue structure of Fe/Al2O3 blending layer was compact and had no porosities.
The Development Trend of Modern Ceramic Products on the Humanized Design
Authors: Huang Hui , Liu Jun Jian
Published: September 2014

The excellent ceramic products of the information age should care for people and design for people. The principles of humanized design for ceramic products include principles giving considerations to both function and comfort, culture and art as well as individuality and pluralism. Besides, those principles should be required to foresee its development trend which manifests in the multiple directions like care for needs, society, environment, physics, sensibility and cultural cognition.
Advances of Study on the Developments and Physical Properties of Composite Materials
Authors: Zhang A Ying , Li Cai Yun
Published: September 2014

Composite materials (also called composition materials or shortened to composites) are materials made from two or more constituent materials with significantly different physical or chemical properties, that when combined, produce a material with characteristics different from the individual components. The individual components remain separate and distinct within the finished structure. The new material may be preferred for many reasons: common examples include materials which are stronger, lighter or less expensive when compared to traditional materials. Composite materials are generally used for buildings, bridges and structures. The most advanced examples perform routinely on spacecraft in demanding environments.
Study on Microstructure Formation of TiAl Based Micro-Laminates Deposited by EB-PVD
Authors: Wang Gu Ping , Ma Li
Published: September 2014

TiAl based micro-laminated sheet was deposited by electron beam physical vapor deposition (EB-PVD) with dual-target in this work, and then the microstructure and phase analysis of as-deposited samples were studied by SEM, XRD and TEM. The results show that the difference of melting points between Ti and Al led to the distinctive structure: the Ti-Al layers were mainly constituted of equiaxed grains and Ti layers were constituted of column grains. Because of the deviation of saturated vapor pressure between Ti and Al element, the component showed a gradient change periodically along the normal direction of Ti-Al layers and results in several sub-layers. The Ti layers, Ti-Al layers and interfacial layers were constituted of α phase, γ+α2 phase and α2 phase respectively.
Mechanical Properties of the Honeycomb Nanoporous Membranes
Authors: Han Fue , Chen Chang Qing , Shen Ya Peng
Published: September 2014

Mechanical properties of the nanoporous film with the relative density of can be determined using the nanoindentation. Using the 3D finite element method, the force-penetration curves are discussed. The elastic and plastic properties of the nanoporous membranes are derived from the loading-unloading curves.
Fuzzy Comprehensive Evaluation of the Wearability of Shapewear Fabric Made of PTT Filament
Authors: Yan Yu Xiu , Feng Yan Na , Zhao Jia Wei , Luo Xing Hao
Published: September 2014

PTT material is suitable for shaping clothing because of its excellent shaping and crease recovery performance, but if as underwear, the wearability of PTT material is being questioned. Based on the L9(34) orthogonal array design, two kinds of samples were kitted utilizing nylon core-spun yarn as ground yarn PTT/nylon filament and Polyester/nylon filament as face yarn respectively, mixed proportion and structure were controlled in the sample design. Test 6 basic wearabilities of samples, the wearabilities of samples were investigated by fuzzy mathematical analysis. The results of this research can be a good reference of shape wear fabric selection.
Graft of Bis-QAC to Cotton Fiber and its Antibacterial Characteristics
Authors: Zhou Fei , Lu Wei , Zhang Zhen , Meng Jiu Ling
Published: September 2014

The bis-type quaternary ammonium salts (bis-QAC) with hydroxyl group in their molecules, 4,5-Bis (alkyl dimethyl ammonium bromide)-1-pentanol were immobilized on cotton fiber to prepare an antibacterial cotton fibers (called as Ws) by using a coupling agent, tetramethoxysilane. The antibacterial characteristics of Ws were investigated. 4,5-Bis (alkyl dimethyl ammonium bromide)-1-pentanol chemically bonded to the surface of cotton fiber exhibited antimicrobial activity against a broad range of microorganism. Their antibacterial activity was not easily influenced by environmental pH and temperature, and could not be removed from the surface of wool by repeated washing.
Study on Preparation of Modified Cotton with Collagen
Authors: Zhang Hai Yan
Published: September 2014

The surface modification process for cotton fabric which was oxidized first, and then crosslinked with collagen was studied. The optimum oxidation process was as follows: concentration of sodium periodate 0.6g/L, time 2.5h, temperature 40°C, ratio of water and cotton fabric was 100:1. The method for surface modification of cotton fabric was determined from comparative analysis, and the optimum process: collagen solution concentration 6%, glutaraldehyde concentration 5%, reaction 40min at 30°C, ratio of water and cotton fabric was 100:1. Compared with original cotton fabric,the breaking strength and elongation of collagen modified cotton fabric decreased, while the dyeing percentage with acid dyes was increased and this means the surface of modified cotton fabric was covered with a large component of collagen.
Synthesis and Electrochemical Performance of K-Doped Li4Ti5O12 as Anode Material for Lithium-Ion Batteries
Authors: Huang Xiao Bing , Chen Hong Hui , Zhou Shi Biao , Chen Yuan Dao , Liu Bei Ping , Zeng Xian Guang
Published: September 2014

Spinel Li4-xKxTi5O12(x=0, 0.03) were successfully synthesized by a traditional solid-state method and systematically investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM) and the charge-discharge test, respectively. The results demonstrated that Li3.97K0.03Ti5O12exhibited much better rate performance in comparsion with Li4Ti5O12. At 0.2 C and 10 C, it delivered a discharge capacity of 173 mAh g-1and 124 mAh g-1respectively, and after 100 cycles at 10 C, 96.1% of its initial capacity was retained.
Synthesis of Lanthanum Oxide Using Lanthanum Chloride by Hydrogen-Oxygen Flame Pyrolysis Route
Authors: Xue Shou Feng , Wu Wen Yuan , Bian Xue , Wang Zhen Feng , Yang Zhi Ren
Published: September 2014

Nowadays, people should pay more attention on the environment problems that had advent along with the development of rare earth metallurgy industry. A large number of water pollutant, air pollutant and solid pollutant were discharged in the process of synthesis of rare earth compound by precipitation and roasting process. In order to solve the industry pollution problems, a new technology route was developed for the preparation of lanthanum oxide using lanthanum chloride as raw material by oxy-hydrogen flame route. The experiment results showed that lanthanum chloride could directly convert to lanthanum oxide under high temperature by the combustion of mixture gas of hydrogen-oxygen that provided by oxy-hydrogen generator continuously. The phase composition of obtained product was characterized by XRD and the conversion rate of lanthanum chloride and the reaction mechanism were discussed.
Effect of Assets of Silicon Film Passivation Layer on the Performance of Silicon Nanowire Solar Cells
Authors: Yang Ping , Zeng Xiang Bo , Zhang Xiao Dong , Wang Zhan Guo
Published: September 2014

Silicon film as a surface passivation layer is reported to reduce surface recombination on silicon nanowires (SiNWs) and thus enable to improve SiNW solar cell (SC) performance. A question yet to be answered regards the link between the silicon film assets and the solar cell performances. We investigated the effect of the properties of silicon films on the SiNWs SC performances by adjusting hydrogen dilution. Our results showed that the open-circuit voltage (Voc) and short-circuit current density (Jsc) of SiNWs SC increase until hydrogen dilution 10 and then decrease. An open-circuit voltage of 0.397 V and short-circuit current density of 18.42 mA/cm2 are achieved at optimized hydrogen dilution. Based on the analysis of silicon film properties we proposed that the increase of defect density with hydrogen dilution was the main cause for the deterioration of SiNWs SC performance.
Effective Components of Hepatoprotective Drugs
Authors: Ting Liu , Juan Liu , Qiong Yang Jian
Published: September 2014

Pathological changes in animal models of autoimmune hepatitis and liver cells were similar to the mechanism of injury and viral hepatitis, the thesis of the active component of several common liver substances studied, wild chrysanthemum extract has anti-bacterial, anti-viral, pharmacological effects such as anti-inflammatory and immune liver and nerve protection, Dicliptera polysaccharide with excellent hepatoprotective activity of the liver that can be used as an adjunct to clinical medicine.
Introduction
Impact of Fillers on Mechanical Properties of Biomass Composites
Authors: An Xiao Hui , Liu Peng , Meng Qiang , Su Cheng Gong , Zhao Shuang
Published: September 2014

In order to improve the mechanical properties of bio composites and reduce the cost of materials, this paper studies the Impact of three fillers-talcum powder, montmorillonite and lignin sulfonate-on the compressive strength and impact absorbing energy of biomass composite, and observes the effects of three fillers on the foam structures by SEM experiments. The study found that sodium lignosulfonate is a good dispersant and water reducing agent, forming the most uniform pore structure in the molded foam process, and this mesh frame structure of biomass composite with three-dimensional and uniform pores shows better effect of compressive resistance and buffering.
Effects of Polysaccharides from Radix astragali on Oxidative Stress Induced by Exhaustive Swimming Exercise in Liver and Muscle of Mice
Authors: Wu Ming , Han Dan , Ma Chuan Fu , Wei Zhen Wei , Li Jun Hong , Guo Li Quan
Published: September 2014

Polysaccharides, the mainly bioactive ingredient ofRadix Astragali, were evaluated for its effects on the oxidative stress induced by exhaustive swimming exercise of mice. A total of 48 mice were randomly divided into four groups: control group, low-dose polysaccharide fromAstragali radix(RAP) treated group, medium-dose RAP treated group, and high-dose RAP treated group. The control group received only distilled water ig, and the RAP treated groups received different doses of RAP (50, 100, and 200 mg/kg, ig) for 28 days. After the final treatment with RAP, the mice were subjected to swimming to exhaustion and the superoxide dismutase (SOD), glutathione peroxidase (GPx) and catalase (CAT) were measured. The data showed that RAP promote increases in the activities of SOD, GPX and CAT in liver and muscle of mice, and the high-dose RAP (200 mg/kg) presented the best effect. These results indicated that RAP possessed protective effects against exercise-induced oxidative stress.
Comparison of Properties on Withdrawing and Refill Friction Stir Spot Welding Joints
Authors: Wang Xi Jing , Wang Xiao Long , Zhang Zhong Ke , Jing Wen Xia
Published: September 2014

The 2 mm sheet of 6082 - T6 aluminum alloy was carried to develop refill friction stir welding and withdrawing friction stir spot welding,the forming of solder joints , the cross-sectional microstructure and fracture morphology of welding joints were observed and analyzed, the cross-sectional microhardness of welding joints were tested. Tensile shear load and fracture mode were contrasted simultaneously. The results showed that smooth surface and free of macroscopic defects of welding joints could be obtained in both welding type. Tensile shear load of WFSSW was up to 10.28kN under the optimal process parameters greater than RFSSW’s 8.62kN.
Conventional Localized Instability Criterion of Sheet Metal Forming and its Application in FLD
Authors: Li Jing , Yang Lian Fa
Published: September 2014

Instability criterion is an important factor to affect the accuracy of forming limit diagram (FLD), which signifies the strain state of metal material when material reaches forming limit. In this paper, conventional localized instability criteria during plastic forming of sheet metals are discriminated by various deduced methods based on plastic instability theory and experiment phenomena. The features, application in FLD of the instability criteria and challenges in future are described.