bluuebunny/crossref_metadata_2025 huggingface dataset:
Reliability-Based Robust Design for Mechanical Components under Small-Sample Information
Authors: He Xiang Dong , Chu Jia Peng
Published: November 2012

In engineering design, according to not considering past experience information; hence, to make structure parameters for achieving high confidence level, much data for traditional reliability-based robust design must be adequately collected, analyzed, and tested. However, in practical engineering, it is very difficult for doing much test, only for getting in the form of finite test samples. Under the conditions, it has much difficult for the traditional reliability-based robust design. In the article, we present a new reliability-based robust design method that solves the form of incomplete information. The method adopts a Bayesian inference technique to estimate reliability, gives definition of Bayesian reliability. In the research, the mechanical parts bayesian reliability-based robust design mathematical model is established and the bayesian reliability-based robust design approach is presented. The numerical results illustrates the method presented is an efficient and practical reliability-based robust design approach.
Study on Fault Diagnosis of Gear Transmission which is Based on ADAMS
Authors: Wang Shi Ming , Ai Xian Zhu , Lv Chao , Ma Li Na
Published: November 2012

Introduced a transmission system of a new oscillation buoy ocean wave energy generation device, the system can transform the mechanical energy into electric energy. A pair of gear model was built by SOLIDWORKS, the parameter is just the same as the real data, then imported the model into ADAMS. Under the same simulation parameters, two experiments were done, one engaged without failure, the other engaged with one broken tooth of drive wheels. Calculated TIME and STEPS by Shannon sampling theorem, simulated the marker point’s acceleration of the drive gear, then obtain image data of time domain and frequency domain, after analyzed, found this method has a significant meaning to practice.
The Fatigue Reliability Evaluation & Improvement of the Single-Arm Subway Current Collector
Authors: Chen Yu , Liu Zhi Ming , Li Qiang
Published: November 2012

This study developed a fatigue reliability method for evaluating and improving the key parts on railway vehicles, which was applied to real structures. The study involved a type of single-arm current collector, while its contact shoe often collapsed in operation and needs improvements. The dynamic stress data from the actual line was tested and converted to load spectra based on damage consistency rule, and then the fatigue life of the contact shoe structure was achieved. The calculation result comes to correspond to its operation life. Based on the method, an improving plan for the structure was developed under optimizing algorithms.
Finite Element Analysis on Structure of a New Torsional Vibration Damper
Authors: Wu Guo Yang , Yang Jun Jie , Jiang Cheng Rong , Li Yun Song , Li Guo Yun
Published: November 2012

Based on the practical working state and load conditions of a car, the stress-strain and its strength in static and dynamic state of a new torsional vibration damper were calculated and analyzed with the finite element theory and tools, providing reliable data and a simple and accurate research method of strength for its practical application.Through strength analysis, the maximum equivalent stress of main parts of damper under static load and the stress time curve under dynamic load were obtained. By comparing the analytical results under static and dynamic load, it shows that all parts of the damper meet the strength requirements under the dynamic load, and that the maximum stress value of main parts under idle speed conditions is higher than that of running conditions, which is consistent with the actual working condition; while under the static load, the rivets did not meet the strength requirement. In conclusion, two feasible methods were proposed to improve the strength of rivets. It is verified that this damper can meet working strength requirements at last.
The Mechanical Stress Analysis of the Converter Trunnion Ring Based on the Pro/E and ANSYS
Authors: Gao Yao Dong , Zhang Yue Juan
Published: November 2012

It introduces the load from the converter when the Angle in 0 degrees, and describes the method of using the Pro/E software to model and importing to ANSYS software, then, based on the finite element theory, using ANSYS software to analyse the mechanical stress of the converte to obtain the maximum stress and the parts of the stress concentration, the analysis results of converter is for designing to provide the theory basis.
The Structure Design of Special-Shaped PDC Reinforced-Cutter and its Finite Element Method Analysis
Authors: Zhang De Rong , Chang Amy , Kong Chun Yan , Zhang Xiao Fei
Published: November 2012

A new structure is proposed to solve the failure mode of PDC cutter created by its mechanical fatigue, crack and diamond table delamination, so as to improve their service life. By applying the finite element method analysis, the force allocation of PDC cutter and multi-face (as known non-planar) designed PDC reinforced-cutter revealed that: the distribution and size of the internal stress in the cutter when working was improved, and the multi-face structure further reinforced the meshing force of the cutter’s PDC layer and cemented carbide substrate. And thus significantly strengthen the shear-resistance capability. This is particularly meaningful to the kinematics of mono-cone bit and its adaptive exploration of rock-breaking features, as well as to the related scientific disciplines in the future.
Optimal Design of the Rubber Chain Attached Board Used in Steel Wire Knitting Machine Based on ANSYS Workbench
Authors: Zeng Qing Liang , Wu Zai Chao , Lu Juan , Zhang Bin
Published: November 2012

The role, principle and characteristics of the rubber chain attached board used in steel wire knitting machine were analyzed in this paper. A new kind of attached board with reasonable structure was designed through comparison of several design schemes. Eventually, through finite element analysis and size optimization design based on Workbench, the structure size of attached board was optimized and the whole strain, the maximum equivalent stress and the minimum safety factor were calculated. At the same time, new design ideas are also provided for the development of steel wire knitting machine to save materials and reduce cost.
Stability Problems of Frequency-Converting Rotation Dynamics on Concrete Mixer
Authors: Tian Jin Yue , Hu Bei Jing , Yang Bao Lin , Wang Xian Feng
Published: November 2012

As a number of parameters significantly influence the concrete mixtures quality, the concrete fluidity impacts much on the production process and product quality. To improve the concrete mixtures quality, the concept of frequency-converting rotation is proposed based on the rotation driving dynamic characteristics of mixer. By analysing the phase-frequency characteristic of twin-shaft mixer's working system, the dynamic behavior of mixing concrete is defined. When the agitating shaft is frequency-converting drive, the "boiling" movement occurs in concrete, which characteristics are better than that constant speed drive makes and improves the microscopic homogeneity of concrete.
Dynamic Characteristic Research of Planar Four-Bar Mechanism with Joint Clearance
Authors: Bo Shao Jun , Guo Rui Bin
Published: November 2012

The joint clearance on mechanism dynamic characteristics influence can not be ignored. This paper established a geometrical model of planar four-bar mechanism, it built the model of contact force and friction and embedded into the software of ADAMS dynamics analysis mechanical system, which analysis the dynamics simulation of mechanism. We obtain a accurate prediction of dynamic characteristics of mechanism with joint clearance effect from the analysis. What's more the results provide reference and basis for later mechanism design [1,2,3].
Study on Dynamic Performance of Linear Direct Drive Based on Pole Placement
Authors: Pan Chao , Zuo Jian Min , Wang Mu Lan
Published: November 2012

Permanent magnet linear synchronous motors (PMLSM) can serve as direct drive actuators for machine tools. However, PMLSM is more easily affected by load disturbance, force ripple and parameter variation. As a result, the design of an appropriate controller and research on dynamic performance are very important for PMLSM. In this paper, a feedback controller based on pole-placement is proposed to achieve desired tracking performance. The effectiveness and feasibility of the proposed method are demonstrated through theoretical analysis. The dynamic response and disturbance rejection ability for linear servo system were researched and the parameters which influence the dynamic performance of the system were discussed.
Redesign of Dynamic Balance of Impact Rammer and Study on New Type
Authors: Sun Chang Fei , Duan Zhi Shan , Chen Ke , Hu Li Jie
Published: November 2012

In order to improve the applicability of the impact rammer, redesign impact rammer. In view of the different application requirements, change the length of impact rammer, redesign dynamic balance of impact rammer, or change the traditional tilted impact rammer to vertical type and reduce the impact rammer quality, make the new type impact rammer can work in more narrow and special space. The applicable scope of impact rammer is extended by the redesign of dynamic balance and the design of new type of impact rammer.
Reliability Analysis of Over-Center Locking of Mechanism
Authors: Qin Qiang , Feng Yun Wen , Feng Yuan Sheng
Published: November 2012

Locking function of a mechanism plays a significant role in safety and reliability. The operating principles of over-center locking in typical mechanisms and influencing factors of reliability to mechanism over-center locking were illustrated. A universal reliability analytical model of over-center locking mechanism was built and the algorithm of over-center angles was proposed. The result shows that in a planar four-bar mechanism, the dimension of driven link and variation coefficients have prominent influence on the reliability of over-center locking. The models and methods proposed in the paper could provide helpful reference in designing over-center locking of mechanisms.
Feasibility Research of Crank-Group Driving Mechanism
Authors: Cao Ju Jiang , Wang Yu Qi
Published: November 2012

This paper illustrated the characteristics of parallelogram linkage，introduced the origin of the crank-group driving mechanism and its design principles, analyzed some problems of virtual constraints，and verified the feasibility of this mechanism.
Kinematic Matrix Method of Portal Crane Boom System
Authors: Li Zhi Guang , Qin Yi Xiao , Bi Ting Ting
Published: November 2012

To research the laws of barycenters of construction members of luffing system is significant. The kinematics of four-bar luffing jib multi-rigid body on portal crane is studied with mathematical matrix method which is convenient for programming calculation. These moving laws are concluded by visual software exactly. The mathematical formula which is the basis of modern design of luffing system is established. Then the cargo movement track and amplitude inertia force are counted handily. Matrix equation is verified by citing case study.
Dynamic Balance Analysis of Automobile Drive Shaft Based on Solidworks
Authors: Huang Kang , Chen Ge , Chen Qi , Zhang Zu Fang
Published: November 2012

In this paper, drive shaft’s dynamic unbalance was calculated based on dynamic theory. The results were presented drive shaft’s dynamic balancing can be assessed by detecting the value of the unbalanced force at both ends of drive shaft. Here solidworks software was used to make an error modelling on the drive shaft. Simulation module is also applied to analyze the model. The results show the tube straightness, yoke thickness difference of flange yoke and symmetrical error of cardan shaft influence dynamic balance of drive shaft. The above findings have a guiding role in the practical production.
The Effects of the Aging Temperature on the Microstructure and Corrosion Resistance of the Nickel-Phosphorus Composite Al2O3 Deposit
Authors: Lian Li Ming , Yan Fang Fang
Published: November 2012

In this Paper, electroless nickel-phosphorus composite of Al2O3 deposit is prepared by chemical plating on 45 steel. Surface topography, microstructure and major elements are analyzed by SEM, EDS and XRD. The results show that the deposit is compact and the binding of the coating interface is very good. It is found that the microstructure of deposit is amorphous and after heat treatment is crystalline. Corrosion test showed that the coating's corrosion resistance is related to heat treatment temperature. It exhibits better corrosion resistance at annealing temperature of 250°C.
Selective Growth of B-Doped Diamond on Si-Doped Diamond Film
Authors: Cui Y.X. , Shen B. , Sun F.H. , Zhang Z.M.
Published: November 2012

Si doped CVD diamond films are prepared on Si substrate by means of hot filament chemical vapor deposition (HFCVD) through adding tetraethoxysilane (TEOS) into acetone as source of reactant gas during the growth process. The samples of diamond films are investigated by scanning electron micrograph (SEM), Raman spectrum, X-ray diffractometry (XRD) and surface profiler. The experimental results show that compared with pure diamond film, Si doped CVD diamond film exhibits grain refinement and smoother surface. Then selective area deposition (SAD) of B-doped diamond films are achieved on both Si doped CVD diamond film and pure CVD diamond film with silicon dioxide layer as sacrificial layer. SEM investigation demonstrates that the boundary of patterning on pure diamond film is rather fuzzy while on pure diamond film it is trim and distinct, which is mainly attributed to the relatively low surface roughness.
Deposition and Application of CVD Diamond Film on the Interior-Hole Surface of Shaped-Wire Drawing Die
Authors: Bian Liu Jin , Lin Zi Chao , Sun Fang Hong , Guo Song Shou
Published: November 2012

Abstract：The shaped-wire drawing dies are used more and more popularly in the metal product industry for several advantages of locked structure. In present investigation, a layer of CVD diamond film is deposited on the interior-hole surface of shaped-wire drawing die using a hot filament chemical vapor deposition (HFCVD) method, followed by a surface polishing process, aiming at further prolonging its working lifetime of shaped-wire drawing dies and improving the surface quality of produced wires. The scanning electron microscopy (SEM), surface profiler and Raman spectroscopy are adopted to present the characterization of both as-deposited CVD diamond films before and after polishing. Furthermore, the performance of as-fabricated CVD diamond coated drawing dies is examined in the practical production process. The results show that as-deposited CVD diamond films are homogeneous and the working surface is smoother after polishing. Comparing with the conventional shaped drawing dies, the working lifetime of the diamond coated shaped-wire drawing dies can be increased by a factor of above 10, and the shaped wires with higher surface quality can be obtained.
Synthesis of Lithium Thin Film by Electrodeposition from Ionic Liquid
Authors: Park Jesik , Lee Jaeo , Lee C. K.
Published: November 2012

Synthesis of metallic lithium thin film was investigated from two ionic liquid of [EMIM]Tf2N and PP13Tf2N with LiTFSI as a lithium source. Cyclic voltammograms on Au electrode showed the possibility of the electrodeposition of metallic lithium, the reduction current in [EMIM]Tf2N was higher than the value in PP13Tf2N. The metallic lithium thin film could be synthesized on the Au electrode by the potentiostatic condition, which was confirmed by various analytical techniques including x-ray diffraction and scanning electron microscopy with energy dispersive spectroscopy. The lithium surface electrodeposited was uniformly without dendrite, any impurity was not detected except trace oxygen contaminated during handling for analyses.
Preparation and Conductive Properties of Ag Thin Film by DC Magnetron Sputtering Method
Authors: Lin Jian Guang , Weng Wei Xiang , Huang Wei Hui , Zhou Hai Fang
Published: November 2012

Ag thin films were prepared on the float-glass substrate by DC magnetron sputtering method. The relationship of surface morphology/electrical properties with technical conditions was investigated. The experimental results showed that sputtering power, sputtering pressure and substrate temperature had effects on the morphology and electrical properties of Ag thin films. The optimum parameters were obtained with sputtering power of 100 W，sputtering pressure of 0.4 Pa and substrate temperature of 130 °C. Under the optimum parameters, the deposited Ag thin film was smooth and its resistivity was as low as 1.96×10-8 Ω•m.
Fresh Concrete Anti-Carbonization and Application of Patching Material in Carbonizing Concrete Structure
Authors: Meng Wei Tao , Wu Yong Xin
Published: November 2012

Concrete construction played a great role in the development of the society home and abroad especially when the developing country is at the high tide of capital construction, but its durability was affected in large measure of carbonization which has brought about huge loss in many fields like construction, water conservancy and transportation etc. Here we comprised the effects on increasing concrete anti-carbonization capacity that the present methods by blending additive or brushing protection coatings. By adapt with the development of the cracks, improved ST-9608 increased its ductility and fatigue resistance and operated much better. However, when it comes to carbonized concrete structure, proper ways and materials should be choose according to the degree of the concrete carbonizations.
Effect of Binders on the Properties of Chromia/Alumina Refractory Castables
Authors: Zhao Jing Ming , Shin Su Jeong , Hwang Kyu Hong , Lee Jong Kook , Bae Dong Sik
Published: November 2012

Refractory castable specimens were prepared using industrial white fused alumina as aggregates, chromium oxide green and ultrafine alumina powder as matrix materials, solid aluminum dihydrogen phosphate (Al(H2PO4)3) or liquid AlPO4 as binder materials. Effect of different binder additions on the propertiSubscript textes of high chromium oxide IGCC refractory castables, such as bulk density, apparent porosity, strength was evaluated and their microstructures were observed by SEM and mercury porosimetry.
The Influence of Seismic Behavior of Web-Type Column - Transfer Structure Caused by Rigidity Variation of the Transfer Storey
Authors: Wang Zhong Xin
Published: November 2012

The transfer structure with web column is a new transfer structure form.The stiffness of the story was changed to analyze the influence of seismic behavior on structure in this paper, and then, the analytical result of such structure under seismic action is also discussed by using PKPM and ANSYS(FEM) , It shows that the structure can clearly improve the bearing capacity ，and some advices are given in this paper for designing this transfer structure too .
Displacement-Based Seismic Design of Steel Frames Strengthened by Buckling-Restrained Braces
Authors: Valente Marco
Published: November 2012

This study presents a displacement-based design procedure for seismic retrofitting of steel frames using buckling-restrained braces (BRB) to meet a given target displacement in the framework of the capacity spectrum method. The seismic performance of a six-storey steel frame equipped with BRB is investigated. Different storey-wise BRB distribution methods are proposed and the influence on the results of the design procedure is analyzed. Nonlinear dynamic analyses demonstrate the efficacy of the design procedure showing the improvements achieved by the retrofitting intervention using BRB. The maximum top displacement registered for the retrofitted frame under earthquake excitation coincides with the target displacement obtained in accordance with the design procedure. The introduction of buckling-restrained braces enhances the earthquake resistance of the steel frame, providing significant energy dissipation and the stiffness needed to satisfy structural drift limits.
The Research of Microparticle Filling Agent in Protecting Hydrocarbon Reservoir Technology
Authors: Zhou Cheng Yu , Luo Yu Feng , Li Yong Jiu , Fu Xue
Published: November 2012

In order to protect carboniferous system layer in east Sichuan, it added microparticle filling agent in drilling fluid. It depended on the physical truth and principle of protecting hydrocarbon reservoir technology which used in drilling fluid. According to the property of filling agent, it studied fluid loss control agent CKH-1, calcium carbonate superfine powder, non-permeate pressure-bearing agent CY-1 and nanometer material. Dosage of CKH-1 was 1%, calcium carbonate superfine powder was 2%, CY-1 was 4% and nanometer material was 1% ,which were firmed via experiment of viscosity and fluid loss control. Microparticle filling agent was sequentially formed.
Effect of MnCO3 on ZnO-Pr6O11-Co2O3-Cr2O3 Varistor Ceramics
Authors: Zhao Ming , Zhang Meng , Shi Yu , Wang Zhi Long
Published: November 2012

0~1.5mol% MnCO3 doped ZnO-Pr6O11-Co2O3-Cr2O3 varistor ceramics were synthesized by conventional oxides mixing procedure. The effect of MnCO3 variations on the microstructure, phase constituents and electric field–current density (E-J) characteristics of the ceramics were studied by SEM, XRD examinations and standard E-J test. The result showed the electrical nonlinearity exponents and breakdown voltage of the ceramics increased from 38 and 1296V/mm of the un-doped one to 52 and 1420V/mm respectively with the addition of 0.5mol% MnCO3; meanwhile, the leak current density was reduced from 4.35μA/cm2 to 2.05 μA/cm2. Further doping MnCO3 deteriorated the overall varistor properties of the ceramics by remarkably decreasing the density of the ceramic, and the main reason causing the density drop was ascribed to the hindering effect of the well dispersed perovskite-like Pr0.95Mn0.9393O3 particles formed mainly within the ZnO grain boundary areas.
Microstructure of In Situ Particles/7055Al Matrix Composites with Deep Cryogenic Treatment
Authors: Zhang Xun Yin , Li Gui Rong , Zhang Ting Wang , Cao Lei , Wang Hong Ming , Wang Jun Jie , Gu Kai Xuan , Zhang Hong , Xu Xiao Jing
Published: November 2012

Al2O3，Al3Ti and Al3Zr particles reinforced 7055 aluminium matrix composites were fabricated via melt reaction method. The volume fraction is controlled at about 4-5%. After extrusion and solution-aging heat treatment the sample was prepared for deep cryogenic treatment, The microstructure and evolution of mechanical properties of (Al3Ti+Al3Zr)p/7055 composites were analyzed using optical microscopy(OM),scanning electronic microscopy(SEM) and X-ray diffraction(XRD). Some θ(Al2Cu) phases with nanometer size precipitate in the inner grain. As some grains preferred orient the intensity of some main diffraction peaks increase. Compared with those of as-cast and squeezed states the micro hardness has increased by 16.8% and 10.0% separately.
Etching Volume Effect on the Morphology of Silicon Etched by Metal-Assisted Chemical Method
Authors: Wang Wei , Zhao Li Juan , Song Ping Xin , Zhang Ying Jiu
Published: November 2012

Assisted by Ag nanoparticles, Si substrates were etched in aqueous solutions containing hydroﬂuoric acid (HF) and hydrogen peroxide (H2O2) with different volumes of etching solution. The etching morphology of Si wafers was found to be affected by the volumes. In etching solutions with smaller volume, the pores were created; in etching solutions with larger volume, the nanostructure composed of nanowires and nanopores (pores+wires nanostructure) were generated. In addition, the lengths of these Si nanostructures increased with the increase of the etching volume. Possible formation mechanism for this phenomenon was discussed.
Electric-Rheological Properties of Nanometer Titania Doped with Europium Oxide in Hydroxyl Silicone Oil
Authors: Dai Shao Jun
Published: November 2012

Nanometer europium oxide-doped titania particles were synthesized and electro-rheological fluids (ERFs) were prepared by reactions of those particles and hydroxyl silicone oil. The characteristics of particles were studied by transmission electron microscope, energy spectrum analysis and X-ray diffraction. The results show that europium oxide solid dissolve in titania and deposit on surface of titania , titania crystal become irregular and even particle size increase. Dielectric constant of titania is 3.25 and doped titania is 5.5. Viscosities and shear stresses of ERFs increase with electrical field increasing and all have critical field (2KV/mm),their viscosities are 4500 pa.s and 6340 pa.s, respectively(E= 3.5kv/mm). Shear stress of titania ERF change into 200 Pa from 50 Pa and that of doped titania ERF change into 800 Pa from 100 Pa when electrical field increased into 3 kv/mm from 0v/mm. Grafting reaction between particle and hydroxyl silicone oil improve stability ratio from 44% to 80 after 144 h.
Study on the Performance of Woven Basalt Filament Diaphragm Fabric
Authors: Huang Jiao , Zhong Zhi Li , Liu Hua Wu , Bao Jing Hai
Published: November 2012

The tensile properties of basalt filament were measured and compared with these of E-glass fiber. The plain basalt filament fabric (PBFF), twill basalt filament fabric (TBFF) and plain glass filament fabric (PGFF) that woven by the CSW-03 loom under the same fabric density were used to make diaphragm preforms. Thermoplastic acrylic resin was chosen to coat on the diaphragm preforms using Werner Mathis AG LTF97885 coating machine when the coating thickness is 0.1mm, curing time is 30min. Tensile test was carried out on the diaphragm performs and coating diaphragm by 3380Instron advanced testing machine. Effect of curing temperature (<200°C) on tensile properties of diaphragm materials was investigated. The coating PBFF and the coating TBFF were compared to analysis the effect of organization structures on the elastic modulus. The results indicated that the best elastic modulus of diaphragm materials was achieved when the curing temperature was 120°C. PBFF is more suitable for diaphragm materials than PGFF and TBFF. The proposed curing temperature for making diaphragm with different elastic modulus ranges from 100°C to 140°C.
Effect of CaO/SiO2 Ratio and TiO2 on Glass-Ceramics Made from Steel Slag and Fly Ash
Authors: Li Bao Wei , Chen Hua , Zhao Ming , Zhang Xue Feng , Du Yong Sheng , Deng Lei Bo
Published: November 2012

Glass ceramics of the CaO-MgO-Al2O3-SiO2 system were fabricated by adopting the melting-casting procedure. Steel slag and fly ash were used as the major starting materials. The influence of CaO/SiO2 Ratio variations on the microstructure and mechanical properties were investigated using X-ray diffraction, scanning electron microscopy and property measurements. Augite is identified as the main crystalline phase of the as studied glass ceramics. The average size of augite grains in form of spherical particles is found within the range of 100-250nm. The bending strength of the glass-ceramics could reach as high as 170.74MPa. Increasing CaO/SiO2 show a beneficial influence on the crystallization of glass ceramics, and its effectiveness is inferior compared with that of increasing addition of nucleating agent, TiO2.
Experimental Investigation on Autoclaved Aerated Concrete Using Palladium-Platinum Tailings
Authors: Zhang Ye , Duan Peng Xuan , Jia Bao Sheng , Zhang Fan
Published: November 2012

In this paper, the low-silicon palladium-platinum tailing is used to produce autoclaved aerated concrete. The influences of water binder ratio, palladium-platinum tailing content, lime content and conditioning agents on the compressive strength of the autoclaved aerated concrete are investigated. Optimal raw material formulation and procedure are determined for the autoclaved aerated concrete. The compressive strength and frost resistance of autoclaved aerated concrete made by the optimal raw material formulation and procedure meet with the requirements of autoclaved aerated concretes of B06 grade, and its thermal conductivity, drying shrinkage reach the requirements of the relevant national standards of China.
Research on Corrosion Resistance of MWEDM Surface with Different Electrical Parameters
Authors: Guo Li Bin , Zhang Bin , Cui Hai , Zhang Hui Gang
Published: November 2012

Micro wire electrical discharge machining (MWEDM) and flat grinding were used to manufacture test specimens of W18Cr4V. Electrochemical impedance spectroscopy and potentiodynamic polarization curves were made to test the corrosion resistance of specimens’ surface with micro cell and electrochemical workstation. Besides, the surface micro-topography after corrosion had been observed with inverted metallographic microscope. The results show that MWEDM surface is better than flat grinding surface in the corrosion resistance. The best Anticorrosive discharge energy of W18Cr4V is 1.25J.
The Investigation on Wear Resistance of Fe-Based Alloy Coating by Argon Arc Cladding
Authors: Guo Guo Lin , Li Yang
Published: November 2012

By argon arc cladding technology, a Fe-based alloy coating was prepared on the surface of Q235 steel. The microstructure of the cladding coating was investigated by optical microscope (OM) and scanning electron microscope(SEM). The microhardness and wear resistance performance of the coating were tested by microhardness tester and friction-wear tester. The results show that the alloy coating with martensite, alloy solid solution and (Cr, Fe) 7C3/Fe3C/ Fe2B compounds is prepared on the surface of Q235 steel, the microhardness of the coating reaches as high as 600 HV and the wear resistance of the coating is about 8 times higher than that of Q235 steel substrate. When deposited a wear-resistant layer on the surface of mild steel , the high plasticity and ductility are preserved as well as the hardness and wear resistance of the cladding layer are improved greatly.
Friction and Wear Behavior of CaO-MgO-Al2O3-SiO2 Glass-Ceramics Prepared by Waste Casting Sands
Authors: Fan Lei , Chen Hua Hui , Mao Wan Ting , Cao Jing Jing
Published: November 2012

CaO-MgO-Al2O3-SiO2 glass-ceramics were produced by using waste casting sands as a main raw material. Friction and wear tests for the glass-ceramics were conducted with M-200 wear tester against GCr15 steel wheel. The worn morphologies, wear mechanisms and compositions of the glass-ceramics were observed and analyzed with scanning electron microscope (SEM) and energy diffraction spectrum (EDS). The results show that under the dry friction sliding the glass-ceramics present high wear rate and friction coefficient, with wear mechanisms are dominantly brittle spalling and some with adhesive wear. By an addition of 10% pure aluminum, the density of the glass-ceramics and wear resistance can be improved with their friction coefficient being lowered. Under oil lubrication sliding, the friction coefficient of glass-ceramics decreases and their wear resistance increases extremely, whose reason is that small pores within the glass-ceramics play an role on oil storage.
Corrosion Characteristic of Double Glow Plasma Hydrogen-Free Carburizing on Titanium
Authors: Guo Li Na , Chen Jin , Pan Jun De
Published: November 2012

Using high purity solid graphite as a source cathode, purity titanium as the cathode, titanium surface was carburized by a double glow plasma hydrogen-free carburizing. Experimental results indicate that a higher hardness carburized layer, containing higher hardness TiC phase and dissociate state carbon antifriction phase was formed on the titanium surface. The carbon concentration and the hardness of carburized layer distribute in the gradient along the carburized layer. The surface hardness reaches 1000HK. The polarization curve of Ti carburized has the passivation peak of wider range, and corrosion rate of 0.089 is lower than that of Ti(0.225),indicating that corrosion resistance of titanium carburized is higher than that of Ti untreated.
Conductive Rubber Nanocomposites as Tensile and Pressure Sensors
Authors: Tang You Hong , Witt Nikolai , Ye Lin
Published: November 2012

A conductive silicone rubber (SR) composite, filled with both carbon nanotubes (CNT) and carbon black (CB) is prepared by a simple ball milling method. Because of the good dispersion and synergistic effects of CNT and CB, the SR composite shows improvement in mechanical properties. As well, due to the assembly of conductive pathways generated by the CNT and CB, the nanocomposite becomes highly conductive at a comparatively low concentration, with very high sensitivity for tensile and compressive stress. These outstanding properties show that the SR composite has potential applications in tensile and pressure sensors.
Effects of H2O2 on Characteristics of Films Formed on Surface of Ti6Al4V in Electrolyte by Micro-Arc Oxidation
Authors: Zhang Ya Ping , Liu Xiang Dong , Zhang Jing
Published: November 2012

Using micro-arc oxidation technology in preparation Ti6Al4V alloy surface oxidation film, adding to the electrolyte H2O2, influence of H2O2 addition amount of oxidation film characteristics has been studied. The results show that, H2O2 addition amount of 4.0 g·L-1, positive critical arcs voltage minimum, for 338 V. SEM analysis showed that, electrolyte of H2O2 addition amount by 1.0 g·L-1 increased to 4.0 g·L-1, film hole diameter after decreasing, micro-arc oxidation film layer of density increases. Oxidation film surface roughness reduced to 7.619 when H2O2 addition amount for 4 g·L-1. With H2O2 addition amount from 1.0 g·L-1 increased to 4.0 g·L-1, micro-arc oxidation film in the wear process mass loss is reduced, wear resistance for promotion.
A New Surface Reconstruction Algorithm for Noisy 3D Unorganized Points
Authors: Song Jun
Published: November 2012

This paper puts forward a new method of surface reconstruction. Power crust algorithm can reconstruct a good surface that is topological valid and be proved theoretically. But when the point cloud is noisy, the surface reconstructed is not good and its running time is long. This paper proposes a improved method of fuzzy c-means clustering to delete the noisy points and a non-uniformly sampling method to resample the input data set according to the local feature size before reconstruction. Experimental results show that the efficiency of the algorithm has been improved much more.
Effect of Coupling Agent Treatment on the Properties of Silicon Carbide Filled LLDPE Composites
Authors: An Qun Li , Shi Xiang
Published: November 2012

Thermally conductive silicon carbide (SiC) filled linear low density polyethylene (LLDPE) plastics were prepared by using powder-mix method. Effects of coupling agent treatment on the thermal conductivity, mechanical properties, morphology and electric properties were also investigated. The results indicate that the coupling agent treatment for SiC particles improves the thermal conductivity of the plastics when using 1 wt.% to 3 wt.% coupling agent. The coupling agent treatment for SiC particles enhances interfacial adhesion between filler and matrix, giving the material higher mechanical properties. The coupling agent treatment for SiC particles also lowers the dielectric constant and dielectric loss of the material, performing better dielectric properties.
Tool Deflection Error Regularization and Compensation in End Milling of Contour Surfaces
Authors: Wei Zhao Cheng , Wang Min Jie , Tang Wu Chu , Wang Liang
Published: November 2012

This paper presents a new approach of tool deflection error regularization and compensation in end milling of contour surfaces. The material removal rate (MRR) is adopted as the dominant factor of surface dimensional error. A mathematics model of determining the MRR in generalized contour surfaces machining is proposed. Feedrate scheduling methodology is applied to regulate a constant MRR along curved tool path. The expectation with the constant MRR is that it will potentially produce a constant surface dimensional error. Thus, the compensation can be conveniently achieved by offsetting the nominal finishing path. The desired MRR and corresponding offsetting value of finishing tool path are determined by a peripheral milling test. Machining results obtained in this study reveal that the proposed approach can significantly reduce the surface dimensional error and the smooth variation of feedrate can get a few variation of surface dimensional error. Comparing to the existing methods, the time-consuming iterative process in error compensation is omitted.
Microstructure and Wear Properties of Laser Synthesized Composite Coatings on Ti-6Al-4V
Authors: Zhao Jin Nan , Liang Jing , Chen Sui Yuan , LIU C.S. , Liu Feng Hua
Published: November 2012

Ti-6Al-4V, C and TiB2 powders (71.5%Ti-6Al-4V+ 26.2%TiB2+2.3%C in wt. %) were prepasted and then laser clad on Ti-6Al-4V substrates. Laser cladding was carried out with a Nd:YAG pulse laser with the parameters of defocus length 15mm, pulse frequency 15Hz, scanning speed 2-4mm/s, electric current 200-240A. Microstructure and phases were analyzed with the Optical Microscopy(OM), Scanning Electron Microscopy(SEM) and X-Ray Diffraction(XRD). Laser cladding layers with smooth surfaces, good metallurgical bonding with no cracks and pores were formed. The average thickness of the coatings is approximately 80μm. Reactions among Ti, C and TiB2 in the laser molten pool cause in-situ synthesis of TiB, TiB2 and TiC reinforcements. The average microhardness is 836HV, which is more than twice that of the Ti-6Al-4V substrate (320HV). Friction coefficients of the cladding coatings fluctuate between 0.26-0.3. Laser cladding specimen with powder mixture of 71.5%Ti-6Al-4V+ 26.2%TiB2+2.3%C (weight loss 0.0007g after sliding 245m) possesses better wear property than that of the specimen with powder mixture of 90%Ti-6Al-4V+ 10%B4C (weight loss 0.0068g).
Investigation on the Interfacial Bonding Strength between Ni-P-W/Al2O3 Composite Coatings and NdFeB Matrix
Authors: Chen Huan Ming , Yang Dong , Lin Xin Xin , Wang Yan Qing , Ma Ling , Gao Ya Hong
Published: November 2012

¹̄The Ni-P-W/Al2O3 composite coatings were deposited on the NdFeB magnetic materials surface by electroless plating method. The morphology of Ni-P-W/Al2O3 coatings was investigated using scanning electron microscopy. And the X-ray diffraction was used to identify the phase constituents. The interfacial bonding strength between Ni-P-W/Al2O3 composite coatings and NdFeB matrix was also tested. The results indicated that the interfacial bonding strength is prone to be increased while the Al2O3 powders co-deposited with Ni-P-W coatings. And the interfacial bonding strength would reach the highest value when the Al2O3 concentration is in rang of 5gL-1 to 10gL-1.
Optimization of Processing Parameters for Electrolysis and Plasma Polishing
Authors: Wang Ji , Suo Lai Chun , Guan Li Li , Fu Yi Li
Published: November 2012

To study influence of temperature and concentration of the polishing solution and the workpiece’s diving depth and spatial orientation in the polishing solution on electrolysis and plasma polishing, orthogonal experiments consisting of four factors at four different levels were performed by using surface roughness of the specimen after 5 minutes of polishing and electric current density in the process of the polishing as experimental indexs based on the polishing mechanism and the mathematic model of surface roughness with polishing time. Primary and secondary order and regularity of the factors affecting the roughness and the electric current density are obtained by means of extreme difference method combined with variance analytic method. Optimal parameter combination focusing on the polishing effects or considering fully the polishing effects, cost and efficiency is proposed.
High Strain-Rate Compressive Response of Epoxy Composites
Authors: Hu Hai Xia , Liu Zhao Zheng , Liu Wei Dong
Published: November 2012

The high strain rate compressive behavior of a bicomponent high performance epoxy resin for advanced composites filled with Polyaryletherketone (PAEK) has been studied on a modified split Hopkinson Pressure Bar (SHPB) setup under dynamic loading conditions. Dynamic stress-strain plot was obtained for each sample. The results of the study indicated that the plastic of the epoxy composites increased while yield strength decreases slightly with the increase of the content of PAEK powder. In contrast, EP/PAEK-10 composite has the best Compressive properties.
Modeling and Movement Simulation of the Interior Transmission Mechanism of the Hoist Based on ProE
Authors: Shi Jia Lian , Yu Zhan Zhong , Jiang Kui Bo
Published: November 2012

The solid models of the mechanical parts were built in ProE software to on the basis of the analysis of the structural characteristics and movement of the interior transmission mechanism of the hoist, and assemble the mechanical parts of the solid models through certain constraint conditions, and simulate the process of its transmission. By simulating tracing the specified key point to get the its variation curve of displacement, the stabilization of the transmission mechanism was verified; comparing the velocity curve of the input shaft and the drum, we can get a conclusion that the transmission ratios of the ProE movement simulation are consistent with the theoretical calculation value, which providing data fundmenatal for further design, analysis and manufacturing of the interior transmission mechanism of the hoist.
Reliability Optimization Design Based on the Blind Number Theory
Authors: Zhao De Xiang , Ling Yong Cheng , Zhao Ju
Published: November 2012

The concept and operation rules of the blind number based on Unascertained Theory are introduced. This case study demonstrates the advantage of unascertained theory described in reliability optimization, and a stress-strength reliability optimization design model is built up at same time. In addition, the corresponding practical optimization calculating program is given. Test on the validity and practicability of this model is also verified by comparing the result of reliability gained from this model with that obtained from the traditional reliability-design method.
Numerical Analysis on Cooling Process of Monocrystal Silicon Rod Manufactured with Czochralski Method
Authors: Liu Xiao Xia , He Li Jun , Zhou Rui , Ma Shao Lin , Mao Jing
Published: November 2012

A numerical analysis was performed to investigate the temperature distribution and thermal stress field in monocrystal silicon rod in the cooling process of manufactured with Czochralski (CZ) method. The thermally-induced residual stress fields of silicon rod under different length of cool-down time conditions were obtained as well as temperature fields, respectively. All simulations were finished by using ANSYS finite element code. It showed that, maximum thermal stress was mainly appeared on rod surface, the influence of length of cool-down time on it was not remarkable, the magnitude of it was far below the critical strength of silicon throughout.
Finite-Element Analysis of Melt Flow in a Vertical Twin-Roll Casting
Authors: Park Jong Jin
Published: November 2012

Twin-roll casting is an efficient and economical process to fabricate metal sheets since it combines solidification and rolling in one process. However, this process requires a careful control because several phenomena, such as heat transfer, solidification, fluid flow and solid deformation, occur simultaneously. In the present study, a rigid-thermo-viscoplastic finite-element analysis was utilized to understand these complex phenomena occurring in a vertical twin-roll casting of an aluminum alloy. As a result several interesting findings were obtained including the development of two symmetrically identical vortexes at the roll entrance.
The Simulation Optimization for Job-Shop Scheduling Based on Plant Simulation Using Genetic Algorithm
Authors: Tian Xiang Ke , Wang Jian
Published: November 2012

The job-shop scheduling problem (JSP), which is one of the best-known machine scheduling problems, is among the hardest combinatorial optimization problems. In this paper, the key technology of building simulation model in Plant Simulation is researched and also the build-in genetic algorithm of optimizing module is used to optimize job-shop scheduling, which can assure the scientific decision. At last, an example is used to illustrate the optimization process of the Job-Shop scheduling problem with Plant Simulation genetic algorithm modules.
Simulation Analysis for Supercavitation Projectiles Penetrating into Metal Targets
Authors: Cao Wei , Sun Tie Zhi , Wang Cong , Zhao Xin Hua
Published: November 2012

The process of the supercavitation projectile penetrating into metal targets was simulated by using the dynamic analysis software ANSYS/LS-DYNA, and the deformation、breakage and forces on the body in different initial velocities and the penetration depth were discussed. Analysis results show that there are two peaks of resistance and the velocities is variety almost in linear attenuation when the cone part of the projectile is moving through contacted with the target plate, which provides references for the structure and parameters design of the supercavitation projectile.
Numerical Simulation on Temperature Distributions to Cold Store
Authors: Xie Jing , Tang Yi , Wang Jin Feng , Miao Chen , Lin Yong Yan
Published: November 2012

On the basis of previous work, the simulation condition of cold store was improved to reduce calculation error. The SIMPLE algorithm and Boussineq assumption were used and the turbulent intensity was also set. The numerical simulation results reflected that the temperature distribution was closer to the previous experimental results after using new method. The error between simulation values and experimental values was decreased. The simulation result showed that temperature of corner was highest in the cold store. The temperature change of the cold store in the cooling process could be better predicted by using modified simulation method and the accuracy of numerical simulation of cold store in the cooling process could also be validated.
Hunting Search and Ant Colony Optimization Mechanisms on Modified Simplex Method for Grease Position Parameter Design
Authors: Boonhao Suphatchai , Luangpaiboon Pongchanun
Published: November 2012

The proper choices of a process parameter design (PPD) decision problem are studied in a noisy environment of a grease position process in an electronic industry. The process responses consist of the mean of parts between failures on left and right processes. A multi-response surface optimization problem is then proposed to maximize these dual process responses. The conventional modified simplex method and its hybridizations of the stochastic operators from the hunting search and ant colony optimization methods are applied to determine the proper levels of controllable design parameters affecting the quality performances. A numerical example demonstrates the feasibility of applying the proposed model to the PPD problem via two iterative methods. Its advantages are also discussed. Numerical results demonstrate that the hybridization based on the hunting search method seems to be superior when compared. In this study, the mean of parts between failures is improved by 27.04%, approximately. All experimental data presented in this research have been normalized to disguise actual performance measures as raw data are considered to be confidential.
Harmonic Analysis on Feed Kinematic Behaviors in Turning of Regular Polygon Section
Authors: Hu Chang Jun
Published: November 2012

Surface characteristics of the regular polygon contour parts and turning process,including tool movement characteristics,feed speed and feed acceleration, is analyzed with the harmonic analysis principle when cutting the parts. Using MATLAB to draw the displacement, velocity and acceleration variations chart of polygon workpiece turning.