bluuebunny/crossref_metadata_2025 huggingface dataset:
Experimental Study on Dynamic Modulus Master Curve of ATPB Mixture
Authors: Pan Yan Zhu , Wang Duan Yi
Published: October 2011

With the development of long life pavement concept, asphalt treated permeable base (ATPB) has become the typical structure of asphalt pavement in more rain and wet area. In order to effectively analysis and prediction of pavement performance, and targeted design, pavement materials parameters research seems more and more important. This paper uses MTS system to do the dynamic modulus test for ATPB-25 and ATPB-30. During the test, different measuring temperature and load frequency are set according to the working environment of ATPB type asphalt mixture. With the dynamic modulus test results, full time domain dynamic modulus master curve and corresponding master curve equation of ATPB type asphalt mixture are created. These experimental studies can provide high quality parameters for the optimization design and performance analysis of asphalt pavement structure with ATPB and are important to extend the service life of the asphalt pavement.
Burr Minimization in Shaping of Aluminium Alloy-Through Experimental and Stress Analysis Approach
Authors: Das Atanu , Saha Partha Pratim , Das Santanu
Published: October 2011

Shaping Burrs are produced at the edge of a workpiece when a cutter exits it. It causes difficulties in manufacturing and assembly stages. Several attempts were made to minimize burr to suppress deburring to improve productivity. Deburring of the surface in shaping operation in railways industry and other industries is a great problem. An investigation on burr formation at the exit edge of aluminum alloy (4600-M) flats in shaping operation is done in this work under dry environment. It is found out that burr is negligible at 150 exit edge bevel angle. Distribution of shear stress is analyzed using FEM to validate the experimental results. It is found that maximum equivalent stress and deformation at different points on the 150 exit edge bevel angle become minimum justifying the experimental observation. Hence, an exit edge bevel of 150 may be adopted to have minimum burr formation.
Research on Modification of Bentonite and its Printing Quality when Used in Color Ink-Jet Paper
Authors: Yang Yong Gang , Gao Qiao Zhuo , Liu Fu Ping
Published: October 2011

In order to know the application of bentonite in color ink-jet paper, an acid bentonite was prepared by modifying with sulphuric acid. Both of sodium bentonite and acid bentonite were characterized and evaluated with scanning electron microscope. The study result from printing quality testing showed that if the formulation of acid bentonite, under the dosage of 35% PVA and PDMDAAC 3% respectively, was used as the pigment, the print effect could be better.
Noether Symmetry and First Integral of Discrete Nonconservative and Nonholonimic Hamiltoinian System
Authors: Wang Xing Zhong , Fu Jing Li , Li Chao Rong
Published: October 2011

The letter focuses on studying Noether symmetry and conserved quantity of discrete nonconservative and nonholonomic Hamiltonian system. Firstly, the discrete Hamiltonian canonical equations and discrete energy equations of nonconservative and nonholonomic Hamiltonian systems are derived with discrete Hamiltonian action. Secondly, based on the quasi-invariance of discrete Hamiltonian action and equation of lattice under the infinitesimal transformation with respect to time, generalized coordinates and generalized momentums, the discrete analogue of Noether’s identity and determining equation of lattice are obtained for the systems. Thirdly, the discrete analogues of Noether’s theorems and conserved quantities of the systems are presented. Finally, one example is discussed to illustrate the application of the results.
CDM Model and its Application to Numerical Simulation on Rotating Band’s Engraving Process
Authors: Sun He Yang , Ma Ji Sheng , Sheng Long Bo , Li Wei , Wu Da Lin
Published: October 2011

A coupled constitutive model of viscoplasticity and ductile damage for penetration problems has been deduced. The model proposed by Lemaitre was based on the continuum damage mechanics. In the model, large strain, high strain-rate, thermal softening and damage evolution were taken into account. At the meanwhile, Von Mises yield criterion, Johnson-Cook hardening model and Johnson-Cook fracture strain model were adopted. The model was implemented in the explicit finite element code Abaqus\Explicit through the Vumat subroutine by using an efficient explicit time integration algorithm. Based on the model, the rotating band’s engraving process was simulated, at the same time the influence of the stress state on damage evolution and the thermal softening effect was discussed. An effective way to simulate the fire process of gun was afforded.
Response Analysis on Asymmetric Twin Tower Building with Large Bases Subjected to Seismic Action
Authors: Wang Qiong Fen , Yao Ji , Cao Liang , Xie Jian Bin , Guo Chun Li
Published: October 2011

In this paper, asymmetric twin tower high buildings with large bases were studied and the FEM model of asymmetric twin tower high building with large bases was established. Then the structural dynamic characteristics was analyzed, the x-direction and y-direction level seismic excitation were input separately with the help of time-domain analysis method, and the acceleration time-domain curve of the top of the structure was obtained, the reference of structural design was provided.
Numerical Simulation on the Microstructure of Small Electroslag Remelting Ingot
Authors: Yao Jun Ping , Sun Zhong
Published: October 2011

The technological parameters determine the metal pool profile and the grain size and orientation in the electroslag remelting process, and thus affect the quality of the final ingot. The microstructure in the small electroslag casting process was simulated by CA method by means of the software MATLAB. Along with the remelting process, the columnar grain begins to grow to certain angle with axles, the shape of the metal pool gets closer to paraboloid shape. Improving the slag pool temperature or increasing the coefficient of heat transfer at the bottom or decreasing the coefficient of heat transfer at the side can lead the axial trend of grain growing to increase and the depth of the pool to shallow, otherwise can lead the trend of grain growing to radial direction to increase and the depth of the pool to deep.
Study on Borehole Stability in Haita Basin
Authors: Sun Yu Xue , Xie Jian Bo , Zhao Jing Yuan
Published: October 2011

The geological structure is very complex in Haita Basin, due to the difficult drilling, sidewall instability phenomena happened frequently during drilling process. And it has restricted the drilling speed and the development and exploration process seriously. According to the borehole collapse problems, physical and chemical properties experiment of mud shale had been operated, then we analyzed and predicted borehole stability of Haita Basin by experimental data, discussed the collapse mechanism in this area, and established corresponding countermeasures to prevent the collapse which has laid a good foundation for further research on key drilling technology and improving drilling rate in Haita Basin.
The Mathematical Model of Online Quenching for Extruding Bar of 6061 Aluminum Alloy
Authors: Lin Yi , Li De Zhi , Zeng Jian Min , Chen Ping , Liang Li Hua
Published: October 2011

A simple mathematical model that correlates the temperature and extrusion speed of a 6061 aluminum bar extruded from the die has been established based on the principle of heat transfer in this paper. The 6061 alloy bar is extruded from the die orifice and is cooled through heat exchanged between the bar and ambient. The temperature of the bar decreases as the distance increases away from the die orifice. The more rapidly the temperature drops, the slower the extrusion speed is. A flexible online quenching apparatus has been set up before the critical quenching position to guarantee good supersaturation of alloying elements. The calculations have shown that at the extrusion speeds of 10m/min, 15 m/min and 20 m/min, the critical quenching positions are 0.44m, 0.88m and 1.30m from the die orifice, respectively for the temperature of 520°C; and for the different temperatures, the critical quenching positions from the die orifice are 0.66m, 1.31m, 1.95m at 530°C and 0.88m, 1.75m, 2.6m at 540°C, respectively.
The Analysis on Structure of U-Shaped Compartment Based on Soil Mechanics Principle
Authors: Wang Feng Yuan , Wang Chuan Yuan , Guo Peng , Cao Qi
Published: October 2011

According to the project requirements, U-shaped compartment was designed and analysed based on soil mechanics principle. The finite element models of U-shaped compartment structure were established, shell element was employed to mesh compartment. Analysis on the structure of the compartment against typical loading conditions was carried out to get the stress distribution of the compartment structure.
Study on a Method for Vibration Control of the Aeronautic Thin-Walled Workpiece in High-Speed Milling Process
Authors: Yuan Song Mei , Zhang He Lei
Published: October 2011

A new method for vibration control of aeronautical thin-walled workpiece in high-speed milling progress using a dynamic vibration absorber is presented. First, the theoretical model of the method is established and studied. Then the effectiveness of this method is testified via the simulation based on FEM. Finally, the feasibility of this method is discussed. The result shows that this method for vibration control of the aeronautic thin-walled workpiece in high-speed milling progress is effective and practical.
Experimental Study on the Effect of CGHAZ Microstructure on CTOD of High-Strength Steel EQ56
Authors: Xia Zi Yu , Miao Zhang Mu , Ma Tao , Chen Gang , Peng Sheng
Published: October 2011

The CGHAZ Microstructure has great effect on the toughness of welding joints and CTOD. This paper discussed the relationship between the CGHAZ and CTOD .The samples, carried out on high-strength steel EQ56, were observed by scanning electron microscopy. The Microstructural analysis result shows CGHAZ microstructure of EQ56-5, presenting high CTOD with 0.272mm, is low-carbon lath martensite and little M-A constituent, which contribute to the better toughness of EQ56-5. CGHAZ microstructure of EQ56-4, presenting the low CTOD with 0.082 mm, contains M-A constituent. The M-A constituent makes the CGHAZ brittle. The crack would grow easily along the M-A grain boundaries.
Neural Network Based Toughness Prediction in CGHAZ of Low-Alloy Steel Produced by Temper Bead Welding
Authors: Yu Li Na , Sasa Masato , Ohnishi Kenta , Kameyama Masashi , Hirano Shinro , Chigusa Naoki , Saida Kazuyoshi , Mochizuki Masahito , Nishimoto Kazutoshi
Published: October 2011

In temper bead welding, toughness is one of the key criteria to evaluate the tempering effect. A neural network-based method for toughness prediction in the coarse grained heat affected zone (CGHAZ) of low-alloy steel has been investigated in the present study to evaluate the tempering effect in temper bead welding. Based on the experimentally obtained toughness database, the prediction systems of the toughness of CGHAZ have been constructed using RBF-neural network. The predicted toughness of the synthetic CGHAZ subjected to arbitrary thermal cycles was in good accordance with the experimental results. It follows that our new prediction system is effective for estimating the tempering effect in CGHAZ during temper bead welding and hence enables us to assess the effectiveness of temper bead welding.
Structure Design and Finite Element Analysis of Airborne Equipment Integrated Mounting Shelf
Authors: Chen Xue Yong , Zhao Ning
Published: October 2011

Abstract. This paper introduces an architecture design of airborne equipment integrated mounting shelf, including constitution of mounting shelf, design method, vibration isolation design,finite element analysis and calculation, etc. Mounting interface between mounting shelf and airborne aircraft is complicated; weight is limited; load on mounting shelf is big and mechanically severe environment must be met. Through dedicated design and simulation analysis, this product has passed each item of airborne environment tests and equipped in military.
Study on Flow-Induced Vibration Characteristics of Hydraulic Hoist of Large-Span Upwelling Radial Steel Gate
Authors: Gao Zhen Hai , Yan Gen Hua , Liu Peng , Chen Fa Zhan , Lv Fei Ming
Published: October 2011

In this paper we conduct study on flow-induced vibration of large-span upwelling radial steel Gate and its hydraulic hoist. Place an emphasis on vibration response characteristics under two working conditions of diversion and drainage, which proves the safety of hydraulic hoist gate vibration caused by gate vibration. Firstly, we study on dynamic characteristics of fluid-structure interaction of association system of gate and start and stop lever, reveals the discipline of the effect fluid having on structural dynamic characteristics. On this basis, flow-induced vibration characteristics under two conditions of with and without start and stop lever action considered. The results indicate that the gate vibration response with hydraulic hoist used decreases, which explains start and stop lever has certain effect of restraining vibration on gate vibration. In addition, under the working condition of drainage the vibration magnitude of start and stop lever is smaller than that of gate body, which explains there is damping action during transference of gate vibration through start and stop lever. The results find out that on the assumption of optimized gate structure and hydraulic arrangement, it is practicable, safe and reliable to adopt hydraulic hoist. The achievement has directive significance on similar projects construction in the future
Structure and Property of ZnO Content with Tb3+ Doped Zinc Aluminum Phosphate Glass
Authors: Fu Chu Ni , Yang H.W. , Wa J.J. , Lai Chun Hung , Lee Yi Mu , Hsu C.S. , Yang P.C.
Published: October 2011

This study explores a series of optical, physical and structural properties based on P2O5-Al2O3-ZnO (ZAP) with glass doped 1 mol% Tb2O3, which changed the composition ratio between ZnO and P2O5. The structure and optical of glasses were studies by Raman spectra and fluorescence spectra. The Raman spectra with the zinc content increases, the 650-810 cm-1 at the P-­O­-P bond has no shift, but the intensity of the absorption peak decreased. The fluorescence intensity increases with the ZnO content increases. The glass density and refractive index also increases with the ZnO content increases.
Study on in-Plane Bending Vibration of a Combined Ring-Beam
Authors: Xing Ji Chun , Xu Li Zhong
Published: October 2011

This paper puts forward a method to calculate the natural frequencies and the mode functions of in-plane bending vibration of the ring-beam. The combined ring-beam is separated into two independent structures—a ring and a beam. Through the continuity conditions, two independent structures are coupled. This paper gives the bending vibration mode functions of the beam and in-plane bending vibration mode functions of the ring, and analyzes the effect of the structural parameters on the natural frequencies sensitivity.
Study on Useful Concrete Elastic-Plastic Constitutive Model
Authors: Wang Hong , Jin Chong , Yuan Hong , Xia Xiao Zhou
Published: October 2011

In order to simulate the elastic-plastic behavior of concrete better, an effective curve fitting method is employed to find the constitutive function based on Legendre orthogonal polynomial and least square method. And a new numerical analysis program using arch-length method to deal with nonlinear problem is designed. The most important consequence is that not only the fitting function, but also its derivative function and its definite integral are recursive. The fitting curve given by new method is applied in numerical analyzing. Cube model is examined under uniaxial compressing with completely restricted boundary conditions. The results show convex deformation and the damage on oblique section clearly. Compared with those piecewise fitting functions, the Legendre orthogonal polynomial fitting function obtained can be introduced into the nonlinear harden-soften character of concrete constitute law more convenient because of its uniform function form and continuous derived feature. And the fitting idea by orthogonal base function will provide a widely road for studying the constitute law of concrete material.
Effects of Rare Earth La on Microstructures, Mechanical Properties and Sliding Wear Behavior of High-Aluminium Zinc Foundry Alloy ZA30
Authors: Yang Di Xin , Xie Jing Pei , Wang Ai Qin , Wang Wen Yan
Published: October 2011

Abstract. In this paper,the effect of rare earth La on microstructures and properties of ZA30 alloy were studied . The result shows that The structure is refined and mechanical properties are improved by adding La to ZA30 alloy,the alloy have best structures and comprehensive mechanical properties when La content is 0.1%; Rich-La phases are metallic compound Cu2La,Al2La and LaZn and precipitate in blocky form ,its number and size increase with La; The abrasive resistance of ZA30 alloy is significantly improved when La is over 0.3%.
Response of Two-Disk Rotor with Squeeze Film Dampers and its Variation with Parameters
Authors: Sun Tao , Qin Wei Yang , Jiao Xu Dong
Published: October 2011

This paper investigated the variation of dynamical response of a low pressure rotor in turbo-shaft engine with its system parameters. Based on the model of low pressure rotor, a dynamical simplified model of two-disk rotor with Squeeze Film Damper at each end was built. Its motion equations were derived. The numerical method was applied to solve the 12-dimensions differential equations. The influence of some parameters, e.g., rotating speed, eccentricity and its phase angle, mass ratio of two disks, were analyzed. From simulation results, it can be seen that when phase difference of two disks’ eccentricity is π, the two disks have their minimum vibration amplitude respectively. When their phase is identical, their vibration responses reach maximum values. The larger the mass of mid-span disk is, the larger the vibrations of two disks are. When mass of mid-span is lesser than that of overhung rotor, the response of system will decrease.
Analysis of Fuzzy Stress and Strength Reliability of Double-Layer Pressure Vessel
Authors: Yu Shao Rong , Yin Yi Hui , Xu Bing
Published: October 2011

The deterministic analytic stress formula of double-Layer pressure vessels is derived. The optimum radius ratio between the inner and outer layers is obtained under uniform safety margins. Based on that, the method for evaluating the fuzzy stress and strength reliability is presented and an application example is given. The investigation provides a reference for further studies of uncertain mechanical problems of multi-layer pressure vessels
Elastic Waves of Anisotropic Saturated Porous Solids with Thermal Effect
Authors: Guo Shao Hua
Published: October 2011

The motion equations of anisotropic media, coupled to the mass conservation and thermo-equilibrium equations of fluid, are studied here based on the standard space of physical presentation for consolidation of anisotropic saturated soils, in which a new compressible thermo-elastic model is induced. A set of uncoupled equation of elastic waves in anisotropic saturated solids is deduced. The results show that the elastic waves and speeds of elastic waves is affected by both anisotropic subspaces of solids and thermal and compressive coupling coefficients between fluid and solid. Based on these laws, we discuss the elastic wave behaviour for isotropic solids.
The Dimensionless Load Separation Method Used for Fracture Toughness Test and its Application
Authors: Shi Kai Kai , Cai Li Xun , Bao Chen , Yao Yao
Published: October 2011

One of tasks of fracture mechanics analysis is to get J resistance curves and fracture toughness of ductile materials. Based on the dimensionless theory, a modified Spb method from the load separation method was proposed. In order to apply load separation method to analysis the fracture toughness of a material from its test data, the testing application J-LSS (J resistance curve-Load Separation Software) has been developed by using visual basic (VB) language and was applied to obtain the fracture toughness values of Cr2Ni2MoV rotor steel and 316L stainless steel. Additionally, the differences between the traditional normalization method and the modified Spbmethod in analyzing fracture toughness through J-LSS were discussed. The modified Spbmethod presented in the paper is more available and can be recommended to renew the current material fracture toughness standard test.
Study on the Force of Flexible Vacuum Cup Fixture for Aircraft Skin Trimming
Authors: Zou Ai Li , Wang Liang , Li Dong Sheng
Published: October 2011

When the aircraft skin is in the process of trimming and on the flexible vacuum cup fixture, by analyzing the stress to the aircraft skin and studying the relationship between vacuum pressure and deformation of aircraft skin, vacuum pressure, vacuum force and cutting parameters, the relationship which between vacuum pressure of flexible fixture and cutting parameters, clamping points of flexible fixture, friction coefficient of cup and aircraft skin, the maximum deformation allowed on aircraft skin is obtained. It provides a methodology to improve the precision of trimming of aircraft skin components.
Instability of Slip Flow between Two Concentric Cylinders
Authors: Ren Ling , Xia De Hong
Published: October 2011

The linear stability of flows confined between two concentric rotating cylinders with wall slip is examined. The curves of marginal stability in the plane of the angular velocities at the walls are obtained as a function of slip coefficient, showing the stabilizing effect of slip on the flow stability. The eigenfunction for the first mode at the onset of instability and the corresponding cell pattern are obtained for different slip coefficients. It is found that the number of cell pattern in the radial direction increases with increasing slip coefficients.
The Application of MATLAB in Computational Fluid Dynamic Visualization Processing
Authors: Zheng Jian , Zhou Chang Sheng , Chen Xiong
Published: October 2011

Computational fluid dynamics (CFD) is an important applied research area of scientific computation visualization. Aiming at the difficult for three-dimensional display in the post-processing of wrap-around fins’ flowfield with commercial CFD software, the visualization techniques of CFD were investigated. And a visualization program was compiled using by powerful graphic processing software of MATLAB. The results showed the visualization program can display three-dimension characteristic of pressure, temperature etc. on the surface of wrap-around fins accurately and visually.
Three-Dimensional Finite Element Analysis Shelves
Authors: Zhao Xiu Ting , Meng Jin
Published: October 2011

The use of Pro/E features a powerful solid modeling and ANSYS finite element analysis a powerful, integrated analysis of the two methods on the shelf for static analysis and modal analysis, obtained the stress, strain and natural frequency and the cloud vibration mode, the correct design of the shelf provides a reasonable theoretical basis. Checking the strength of the shelf structure can shorten the shelf of the production cycle, reduce costs and improve shelf quality, has a certain value engineering practice.
Influence of Tip Injection and Film Cooling for Blade Tip Flow and Heat Transfer
Authors: Yu Kua Hai , Hu Liu Xian , Yang Xi , Yue Zhu Feng
Published: October 2011

A numerical based study was conducted to further understanding of turbine tip leakage and flow mechanisms for squealer tip blade. Three blade geometry models with different tips are established. They are squealer tip blade, squealer tip with injection holes blade, squealer tip with injection and film cooling holes blade, separately. Coupled aerodynamic and heat transfer numerical simulation method is used to study blade tip flow and heat transfer based the whole blade computational model. The results show that tip coolant injection will perform a positive effect for the resisting tip leakage, and it will reduce the temperature of blade tip surface and squealer rim, greatly. Film cooling near tip can cool blade squealer rim effectively, but it brings extra total pressure loss.
Study of Pre-Tightening Force on Piezoelectric Multi-Dimensional Force Sensor’s Measurement Performance
Authors: Li Ying Jun , Wang Gui Cong , Li Chang Chun , Ai Chang Sheng
Published: October 2011

In this paper, the pre-tightening force on piezoelectric multi-dimensional force sensor is researched. Structure of multi-dimensional force sensor and piezoelectric quartz crystals are introduced and analyzed. The relationship between pre-tightening force and measuring range of force sensor is researched. Structural model of multi-dimensional force sensor is built and analyzed by FEM. Horizontal linearity in horizontal direction with different preloads is obtained. In order to verify FEM analysis, a reduced prototype of piezoelectric multi-dimensional force sensor is fabricated. Verification test is designed and made. The research will provide certain reference value for development of piezoelectric multi-dimensional force sensor.
Effect of bct-5 Si on the Indentation of Monocrystalline Silicon
Authors: Mylvaganam Kausala , Zhang Liang Chi
Published: October 2011

Mono-crystalline silicon experiences various phase transformations under different loading conditions. This paper reveals, with the aid of molecular dynamics simulations, that scratching the silicon {001} surface along the [110] direction under a load of 0.8 µN or more would produce stable 5 coordinated body centered tetragonal (bct-5) silicon in the subsurface. By examining the effect of this bct-5 silicon on indentation, it was found that the resistant to deformation of bct-5 silicon is higher than a-Si but lower than diamond Si.
The Comparative Study on Lower Limb Muscles between International and National Master Skating Athletes
Authors: Zhang Xiao Ming , Xia Jiao Yang
Published: October 2011

The knee and ankle muscle strengths of excellent male 500 meters skating athletes were measured and analyzed by means of the CYBEX NORM isokinetic testing and rehabilitation system. The study provides scientific basis for the coaches understanding the practical muscle capacity in accordance with special event, and for the analysis on athletes’ practical training level, potentials and drawbacks of main special muscles. The results are as follows: there are distinct differences between the two groups in some muscles of knee and ankle. The muscle strength features of international skaters are better than national skaters’.
Electrodeposition of Cobalt Nanoparticles from Mixture of 1-Butyl-3-Methylimidazolium Chloride Ionic Liquid and Urea
Authors: Ren Wang , Zhang Ying , Li Min Jiao
Published: October 2011

The electrodeposition of cobalt nanoparticles from mixture of 1-butyl-3- methylimidazolium chloride (BMIC) ionic liquid and urea was investigated. The results from the cyclic voltammetry (CV) show that the reduction of Co(II) to cobalt is an irreversible process and controlled by the diffusion of Co(II) on Pt working electrode. The cobalt nanoparticles prepared by direct current (DC) electrodeposition method at 70 °C were characterized by scanning electron microscope (SEM). Test results indicate that the Co nanoparticles are grain-like arrays and link together because of their magnetic property. The average length of these particles is about 100 nm.
Effects of Filament Pre-Tension to the Characteristics of Solo-Sirofil Composite Yarn
Authors: Yang Rui Hua , Wu Wei Mian , Wan Yu Qin , Gao Wei Dong , Wang Hong Bo , Xie Chun Ping , Wang Shan Yuan
Published: October 2011

Pre-tension of filament is critical to the characteristics of solo-sirofil composite yarn. In this paper, solo-sirofil yarns under filament pre-tension of 5-25cN were produced by modified EJM-128K ring spinning frame. The hairiness, breaking strength, breaking work and yarn evenness were tested under standard test conditions. It’s explored that when the pre-tension of filament is 15cN, perform of solo-sirofil achieve the best level with lower hairiness, higher breaking strength and breaking work, and better yarn evenness.
Fabrication of Porous Ceramic Scaffolds via Polymeric Sponge Method Using Sol-Gel Derived Strontium Doped Hydroxyapatite
Authors: Sopyan I. , Mardziah C.M. , Singh Ramesh
Published: October 2011

Recently, development of porous calcium phosphates ceramics has raised considerable interest. A porous structure promotes cell attachment, proliferation and provides pathways for biofluids. Therefore, a high porosity with interconnected pore structure generally favors tissue regeneration. In this work, replication of 0, 2, 5, 10 and 15% SrHA (strontium-doped hydroxyapatite) porous scaffolds via polymeric sponge method has been employed using the sol-gel derived SrHA powders. To prepare the porous samples, the synthesized SrHA powders were mixed with distilled water and dispersing agent followed by drying in the ambient air and specific sintering process. Morphological evaluation by FESEM measurement revealed that the SrHA scaffolds were characterized by macro-micro interconnected porosity, which replicates the morphology of the cancellous bone. Compression test on the porous scaffolds revealed that doping 10 mol% of strontium in HA has increased the compressive strength by a factor of two compared to the undoped HA with 1.81±0.26 MPa at 41% porosity.
Study on the Vibro-Acoustic Characteristics of a Vibration Isolation Mass Structure with Composite Braces
Authors: Jia Di , Pang Fu Zhen , Yin Xu Chao , Xi Ye
Published: October 2011

In this paper a vibration isolation mass structure with composite braces is proposed to reduce noise and vibration transmission through the hull and internals of a double cylindrical shell. Influence of the various complicating effects such as vibration isolation mass’s cross section size or the layout location on the vibration isolation performance of composite braces structure are discussed. Besides, we also provide a composite structure form with high transmission loss due to the theory of vibration insulation of isolation mass and noise reduction of damping material. Study shows that composite braces structure combined the appropriate vibration isolation mass with viscoelastic material can effectively decrease the hull vibration and sound radiation in the mid-high frequency domain, which can significantly attenuate transmission of the plate flexural wave.
Effects of Aging Treatment on Performance of Explosive Welded Beryllium-Bronze/Carbon-Steel Composite Plate
Authors: Zhang Guo Shang , Hou Shu Zeng , Wei Shi Zhong , Li Ji Wen , Xu Liu Jie
Published: October 2011

This paper dealt with how the aging time and temperature affected the hardness of beryllium bronze layer in the explosive welded beryllium-bronze/carbon-steel composite plate. The properties of shearing, bonding, cold bending and microhardness were studied in term of the composite plate, including the aging and nonaging. The optimum aging treatment process of the composite plate is aging temperature at 320°C for 3 hours. And the results show that: aging treatment has no obvious effects on the shear strength but sharply decreases bond strength of the composite plate. And aging treatment to a certain extent reduce the cold bending prroperty. After aging treatment, the microhardness value and distribution of carbon steel was no obvious change, and the microhardness of beryllium bronze sharply raised and smoothly distributed.
Controllable Synthesis of CuNWs in High Yield and their Potential Applications in SPR Based Fields
Authors: Li Xing Xing , Jiang Mei Ping , Su Jiang Bin
Published: October 2011

High-quality Cu nanowires (CuNWs) were synthesized in high yield by an improved liquid-phase reduction method. In each synthesis, both length and diameter of CuNWs could be controlled by changing water bath temperature and the concentrations of reagents. Furthermore, magnetron sputtering technology and spin-coating method were combined to fabricate a kind of Cu NWs/thin-film structure. Optical testing results showed that such composite structure exhibited an abnormal absorption at the wavelength of about 656nm, which might have potential applications in surface plasmon resonance based fields.
Research on Thermal Deformation State of Mould Copper Plate with Different CC Technical Parameters
Authors: Sun Li Gen , Li Hui Rong , Zhang Jia Quan
Published: October 2011

Heat transfer coefficient, temperature of cooling water and casting speed have definitely influence for the mould thermal state, especially with the high temperature. The coupled visco-elasto-plastic FEM models have been presented for thermal process analysis of steel shell and the mould copper plates. It is shown that, the heat transfer coefficient and the temperature of cooling water have little influence to the maximum equivalent mises stress and equivalent strain of the mould; but the casting speed has a great influence, with the increasing casting speed from 1.0 to 1.6 m/min, equivalent mises stress creasing rate is reached to 8.7%, and the equivalent strain is also getting smaller.
Fine Spherical Tungsten Powder Prepared by Precipitation Reaction
Authors: Lin Tao , Li Yan Jun , Wu Cheng Yi , Guo Zhi Meng
Published: October 2011

The spherical tungsten powder was prepared by chemical reaction with ammonium tungstate and strong acids under ultrasonic and mechanical agitation. After precipitation reaction, the precipitate was dried and grinded, and then reduced into tungsten powder with hydrogen. The effects of acid kinds and dispersant on the fine tungsten powder were studied in this paper. The result shows that the acid kinds and its addition amount have great effect on the shape of tungsten particles. The tungsten powder with uniform particle size and spherical could be prepared by adding 17ml sulfric acid into 100ml ammonium tungstate. The tungsten particles can be finer and more dispersive, and have a spherical with addition of dispersant SDS (Sodium dodecyl sulfate). The particle size is about 1.5 micrometer.
Assembly System Design with Modularity and CA Support Using
Authors: Javorova Angela , Oravcová Jarmila , Velíšek Karol
Published: October 2011

This paper deals about designing process of assembly system with using of modularity and CA systems. Paper describes the benefits of using the principle of modularity in the design process of assembly system. The methodology is divided in to the five project phases. There are: assembly product analysis, hardware specification, selection of proper control system, control system simulation and whole process simulation.
Research on Motion Generation for Machining Axisymmetric Aspheric Concave Surface
Authors: Zhang Lei , Huang Zhi Dong , Zhao Ji , Zhang Shi Jie , Zhou Meng
Published: October 2011

The positions and orientations of the tool and workpiece are analyzed for machining axisymmetric aspheric concave surface and the position and orientation matrixes of the workpiece and the tool are obtained. The relationship between the tool and the workpiece is set up by using the method of coordinate transformation. The basic modules and the necessary motions for generating axisymmetric aspheric concave surface are clarified. And the possible structural configurations of the machine tool are proposed and optimized. The results in this paper facilitate the innovation design of a machine tool for generating axisymmetric aspheric concave surface.
Parameters Optimization for the Triplet High Voltage Disconnect Self-Elastic Contact Fingers Based on the New Cu-Cr Alloy Strip
Authors: Zhang Yan Min , Liu Wei Feng , Song Ke Xing , Zhang Ya
Published: October 2011

Based on the performance of new Cu-Cr alloy strip, triplet self-elastic contact fingers by traditional copper material were analyzed. Through the finite element numerical simulation and DOE sensitivity analysis, it is determined that thickness was the key parameter which impacts the contact fingers structure. Then the structure parameters were optimized. The results show that after optimization, thickness of contact fingers by traditional copper material decrease to 3.43 mm from 5 mm, the maximum equivalent stress is 315.37 MPa, the maximum shear stress is 181.24 MPa, the maximum deformation is 2.55mm, and the mass is reduced about 30%.
Self-Heating in Monolith and U-Shape Microcantilever Hotplates
Authors: Ansari M. Z. , Choi Won Jun , Lee Ming Yu , Cho Chong Du
Published: October 2011

Microcantilever hotplates use the self-heating phenomenon to achieve the required large, uniform temperature field or the cantilever-tip movement. The present study investigates the effect of self-heating on temperature and its distribution in microcantilever hotplates in monolith and u-shape configuration with different substrate materials, operating environments and applied voltages. The cantilevers are made of Si and SiO2 with a p-type Si resistor embedded. The cantilevers are operated in air and water at different applied voltages. The numerical analysis uses finite element analysis software ANSYS Multiphysics. Results show that monolith and u-shape cantilevers have similar temperature distributions, but the maximum temperature values in u-shape cantilever are higher.
Stress Analysis on Projectiles Colliding into Sand
Authors: Jung Young Hun , Youn Joon Sik , Bang Han Seok , Kim Jae Kap , Park Sung Ho , Choi Woo Chun
Published: October 2011

In a cannonball firing test, inactive cannonballs are fired to an impact area of a medium such as sand. Collision, penetration, impulse damping and fracture are investigated. For an efficient construction and utilization, researches on media for an impact area are necessary. In this study, the collision and penetration of cannonballs into sand is analyzed. It is found that density of a medium is an important factor.
Study on the Processing Technology of ERTI-7 Titanium Wire Based on AHP-PQ Model
Authors: Zhang Cheng , Mo Rong , Yang Hai Cheng , Wang Xiao Jun , Lu Xiao Rui
Published: October 2011

This article determines the main factors influencing the quality of ERTi-7 titanium wire through building AHP-PQ model: processing technology. under the circumstance of instable quality of ERTi-7 titanium wire in international market. Through the selection of raw material, feeding material evenly during melting, control of melting times and the determination of surface machining process, the inhomogeneity of chemical compositions of ERTi-7 and the corresponding removal method are studied. The results show that it is easier to obtain ingot with good surface and fine structure using triple melting without increasing the content of Pd element, and then going through non-oxidation roller-die drawing process, we will obtain qualified titanium wire with good surface and also conforming to the request of AWS A5.16/A5.16M:2007.
Multivariate Statistical Process Control with Multi-Dots Alarm Rules
Authors: Wang Hai Yu
Published: October 2011

This paper mainly studied to building multivariate control charts of multi-dots alarm rules. For different multi-dots alarm rules, control limit parameters can be given by a kind of method of calculating average run length. Then the performances of those kinds of multivariate control schemes under different alarm rules were compared with Hotelling T2 chart, MCUSUM and MEWMA. We can find from this compare that those charts under different alarm rules have advantage in detecting small changes in the mean vector of a multivariate process. At last, an example is used to illustrate how this method can be used in practice.
Effect of Ultrasound Action Modes on the Oxidation Resistance of Ni-Nd2O3 Nanocomposite Coatings
Authors: Li Xian Hui , Xue Yu Jun , Zhang De Ying , Li Ji Shun
Published: October 2011

The Ni-Nd2O3nanocomposite coatings were prepared by electrodeposition with different modes of ultrasound action. The surface morphology and co-deposited Nd2O3content of Ni-Nd2O3nanocomposite coatings were analyzed by scanning electron microscopy (SEM). The microstructure of Ni-Nd2O3nanocomposite coatings after oxidation was examined. The oxidation resistance of the coatings prepared by different electrodeposition methods was comparatively investigated. The results show that the content of Nd2O3nanoparticles greatly influences the oxidation resistance of nanocomposite coatings. The nanocomposite coating has an excellent oxidation resistance with the increased content of Nd2O3nanoparticles. Meanwhile, Nd2O3nanoparticles and ultrasound can significantly affect the microstructure and the oxidation resistance of Ni-Nd2O3nanocomposite coatings. The Ni-Nd2O3coating prepared by electrodeposition with dual-frequency ultrasound action has finer grains and denser structure and exhibits a superior oxidation resistance compared with the other coatings.
Deep-Hole Single-Edge Technology Test of Rigid Reamer
Authors: Shen Xing Quan , Li Yao Ming , Zhang Hai Jiao
Published: October 2011

Single-edge rigid reaming process has high-speed cutting rigid hinge processing, auto-oriented, low surface roughness of a series of advantages. In this paper, by using of the elastic and plastic theory, we studied the effect of the force acting on the guide block extrusion on the hole wall, proposed the two different cutting states of single-edge rigid reaming processing, and analyzed the conditions of the reaming processing in the extrusion state. By the analysis of experiments, we obtained that in order to achieve the good hole processing surface quality we must make the reaming processing in the extrusion processing state, and we determined the impact of the cutting parameters on the cutting force and surface roughness.
Renovation Design of Coal Powder Conveyor Bearing Support
Authors: Wang Hai Tao , Xu Shi Feng , Huang Li Ping
Published: October 2011

The bearing support breakage of screw coal powder conveyor in power plant boiler went through four stages: axial displacement of shaft sleeve, shaft sleeve wearing by shield ring and by bearing, and the wearing of skeleton seal rings and dustproof felts by shaft sleeve. By analyzing the wearing characters of each part, the renovation structure was designed. The bearing settled style was changed from using shield ring to using locknut by designing convex sidestep on the shaft sleeve, preventing the axial from drifting. Substituting for the welding assembly, the bolt connecting between the covers and the bearing support body was selected to replace the worn sealing materials easily in dismantling and installing. Good operating effects were achieved after the renovation of the coal powder conveyor bearing support, in the screw coal powder manufacturing line of 100MW power plant boiler, there was no line vibrating, coal leaking, noising and line locking, having decreased the repairing cost greatly and insuring the safety and stable electric power producing.
Research on the Micro-Cutting of 0Cr18Ni9 Stainless Steel Films by Femtosecond Laser
Authors: Xu Bin , Wu Xiao Yu , Ling Shi Quan , Yi Kai , Luo Feng , Du Chen Lin , Sun Xiu Quan
Published: October 2011

In order to research the ablation of 0Cr18Ni9 stainless steel films whose thickness is 20μm, stainless steel films were ablated and micro-cut by fs laser in the paper. Firstly, the ablation threshold of 0Cr18Ni9 stainless steel films and the beam waist radius of fs laser were obtained based on the functional relation between ablation area and the laser energy. And, experimental results indicate that the waist radius of fs laser is 10.416μm and the ablation threshold of stainless steel films whose thickness is 20μm is 0.455J/cm2. Secondly, in order to observe the heat-affected zone, metallographic phase and electrical resistivity of stainless steel films ablated by fs laser were researched in detail. And through the experimental results, we can deduce that metallographic phase of specimens which were cut by fs laser was in recovery process and the metallographic was not change. Finally, in order to research the composition of stainless steel films phase affected by fs laser ablation, specimens were tested by XRD. And through the XRD test, it can be deduced the composition of stainless steel films phase was not affected by fs laser cut and the content of phase was affected by it.
Design of Docking Probe Based on Dynamics Model of Flexible Beam Impact
Authors: Zhang Xiang , Huang Yi Yong , Han Wei , Chen Xiao Qian
Published: October 2011

The issue considered in this paper is a flexible beam based on space probe-cone docking mechanism, which aims to buffer impact effects replacing buffering mechanism. The theoretical model of docking impact dynamics based on flexible beam is built according to the Lagrange Analytical Mechanics theory. The shape of docking probe is optimized by using genetic algorithm.
Feature Extraction from Engine's Data Based on Rough Sets Theory
Authors: Wang Feng , Jia Li Xin
Published: October 2011

The speed signal of engine contains abundant information. This paper introduces rough set theory for feature extraction from engine's speed signals, and proposes a method of mining useful information from a mass of data. The result shows that the discernibility matrix algorithm can be used to reduce attributes in decision table and eliminate unnecessary attributes, efficiently extracted the features for evaluating the technical condition of engine.
Simulative Analysis of Carry Out Fontusing near Field Photolithography
Authors: Yang Ching Been , Chiang Hsiu Lu , Chen Chein Chung
Published: October 2011

Adopting the concepts of integration and cumulative sum of exposure energy in the intersecting region between two fabricated line segments, an analytical method of exposure energy density equation for near field photolithography of font fabrication is established. At the same time, cutting photoresist into limited nodes, together with the use of the integral equation of exposure energy density and Mack’s developing model, the full-width at half maximum (FWHM) and fabrication profile of font can be calculated. As analyzed in the study, in the intersecting region between two fabricated line segments, the greater the exposure energy, the deeper the fabrication depth; while in the straight-line region of fabricated lines, as the exposure energy is equal, all the fabrication depths are the same. The research analysis of the paper can be a reference for near field photolithography of font.
The Novel Calibration Method for 3-DOF Measurement System
Authors: Lee Kwang Il , Jang Jin Seok , Lee Hyun Woo , Kim Suk Jin , Lee Sang Ryong , Yang Seung Han
Published: October 2011

In this paper, a novel calibration method is developed to improve the measurement accuracy of 3-DOF measurement system. The squareness error between three sensors and misalignment error with respect to reference coordinate of machine tool are calibration parameters. To estimate these parameters, reference ball is used and moved in the measuring ranges of 3-DOF measurement system. The relation between calibration parameters, position of reference ball, measured data of sensors are defined using geometric constraint and estimated using least square method. Finally, simulation is done to check the feasibility of developed calibration method. The result of simulation revealed the validation of developed method.
Air-Cooled Mn-Series Bainitic Steel as 5Mn2SiNbTi of Grade YS 415 to 550MPa for Seamless Steel Pipe
Authors: Feng Chun , Shen Zhao Xi , Zheng Yan Kang
Published: October 2011

The mechanical properties and microstructure of Mn-series bainitic steel as 5Mn2SiNbTi after air cooling and tempering have been investigated in this paper. The results show that the investigated steel show high strength (tensile strength up to 671MPa), low toughness (20J at -30°C) after hot rolling (final rolling at 1050°C) and air cooling. Medium temperature tempering can improve the toughness, without sacrificing strength of the steel. After tempering at 450°C for 1h, the steel obtained 632MPa tensile strength, 467MPa yield strength, 140J impact energy at -30°C, remaining 25.0% elongation. It is indicated that the tested steel can gain excellent combination of strength and toughness without precious alloy adding, control rolling and control cooling.