bluuebunny/crossref_metadata_2025 huggingface dataset:
The Design and Implementation of Motion Control Card Based on DSP
Authors: Shi Xiao Juan
Published: March 2010

A hardware implement scheme is proposed based on digital signal processor, and the complex programmable logic device and industry standard architecture bus is proposed. The dual-port random access memory communication circuit, I/O port address decoding circuit, two axis control output circuit and position detecting circuit are developed, the main program and interrupt-serving program of digital signal processor are designed by the idea of modularization. The static accuray of the motion control card is tested via special experimental device. The present analysis show that the designed circuit is effective and the static control precision of motion control card is satisfied.
Effects of Geometric Characteristics on Flow Ratio of the Melt and Modifying the Checking Formula
Authors: Wang Dao Hong , Jiang Bing Yan , Chu Chun Peng , Deng Yi Shan
Published: March 2010

The melt fluidity of the two typical plastic, including polypropylene (PP) and polyethylene(PE), are studied in the different mold with the different characteristics of channel cross section and channel profile for the fluidity test of the melt. The relationship among the flow ratio, characteristics of channel cross section and channel profile are analyzed. The modified law of the flow ratio was proposed on the basis of the experiment, and discussed in detail. The results are better based on the experiment analysis, and the checking formula of the melt flow ratio could be used to check the designed mold in production.
CNC Machining Technology for the Sliding Block Parts with Special Shape in the Automobile Mold
Authors: Gong Xiao Xin , Rui Yan Nian , Qian Guo Feng , Duan Xiao Ren
Published: March 2010

It is important for the CNC machining process of the typical sliding block parts with special shape in automobile mold. The mold structure analysis is developed, and the process schemes and cutting parameters of the mold machine are optimized during producing mold based on the mold structure analysis. The present analysis can solve the difficult processing problems of the complex parts and improve the process quality and production efficiency. is the method has the advangtages of advanced, scientific and practical etc..
A STEP-Compliant Approach to NC Programming of Freeform Surfaces
Authors: Liu Ri Liang , Wang Yi Ran , Zhang Cheng Rui , Xu Yuan Fan
Published: March 2010

In order to realize STEP compliant NC manufacturing, STEP-NC (ISO 14649) has been developed over last decade by the International Standard Organization as a new data model for CNC programming. This paper proposes a framework for STEP compliant NC programming of the freeform surfaces. The system is supposed to read the CAD model produced by commercial CAD/CAM software and represented in STEP format, prepare the process information, and finally generate the STEP-NC compliant program. Major issues relating to CAD data extraction, toolpath calculation and NC program generation are presented.
Anisotropic Lapping of Single Crystal Sapphire
Authors: Zhou Ping , Gao Peng Fei , Wang Wei Fang , Wen Dong Hui
Published: March 2010

Lapping processes of single crystal sapphire are investigated in relation to crystallo- graphic orientation, the influence of the crystal anisotropism under different lapping liquid concentration, loading forces on materials removal rate and roughness in sapphire lapping is discussed. C-plane(0001),M-plane ( ),R-plane ( ),A-plane ( ) sapphire wafers were used for lapping experiments, experimental results show that Surface roughness is depend on the fracture toughness, surface orientation with higher fracture toughness such as C-plane would get better roughness during lapping, material removal rate of R-plane is the lowest in four planes, it is for elastic modulus and fracture toughness of R-plane are less than other three planes.
Research on the Application of USM in the Ultra Precision Stage
Authors: Lin Hai Bo , Yang Guo Zhe
Published: March 2010

A nanometer precision location stage for micro-EDM was designed, which was built by the using of ultrasonic motor as driver unit. The stage precision test was done then. The results showed that the stage worked well and reached high precision. The research provided a new solution about the design of precision location stages.
The Architecture Design of Integrated Reverse Engineering System and Preliminary Exploration of its Key Technologies
Authors: Yu Xi Fa , Yi Su Jun , Li Ci Xiang , Lin Jing
Published: March 2010

According to the characteristics of integrated reverse engineering system, the architecture system of integrated reverse engineering which oriented to products rapid development is established. The composition of the system and the function of the function modules was discussed, and the overall framework model of the system was designed. Aiming at the key technologies such as in-kind digital methods techniques, models innovative design and reverse manufacturing, this paper make briefly analysis.
Overview of Rapid Prototyping for Fabrication of Bone Tissue Engineering Scaffold
Authors: Liu Yun Feng , Dong Xing Tao , Zhu Fu Dong
Published: March 2010

The scaffolds of bone tissue engineering (BTE) are designed with complex interconnected pores for providing mechanical support, cell attachment and nutrition delivery, and can be directly fabricated via rapid prototyping (RP). Based on reviews on amount of papers, fundamental of BTE, including research procedure and biomaterials for scaffold are presented. And various RP methods for scaffold fabrication, including selective laser sintering (SLS), fused deposition modeling (FDM), 3 dimension printing (3DP), are introduced. The conclusions including existing problems and future researches about BTE scaffold fabrication are given at the end.
Research on Graphitization of Accelerant Polishing Technique for CVD Diamond Film
Authors: Ji Shi Ming , Xu Zhen Hao , Zhang Li , Yuan Qiao Ling , Wen Dong Hui
Published: March 2010

Accelerant polishing is a new polishing technique based on the principle of diamond graphitization. It makes full use of the catalysis of transition metal such as Fe, Ti. In this paper, it researches on the trend of the graphitization of CVD diamond film at different temperature by DTA, TG, DTG and Raman spectra analysis. The results show that accelerant polishing technique can reduce the required conditions of graphitization, and carry out the graphitization reaction at a low temperature.
Application of a Hybrid Algorithm Based on Genetic Algorithm and Hill-Climbing Algorithm to Tool Path Optimization in CNC Machining
Authors: Du Hai Qing , Qi Ji Bao
Published: March 2010

The efficiency of CNC machining is greatly influenced by the tool path. A new hybrid algorithm for tool path optimization in CNC varied-shape grinding is presented in this paper. The algorithm was constructed by adding hill-climbing algorithm to nature genetic algorithm. In the new algorithm, the crossover operator and mutation operator were redesigned to enhance the local search capability and to accelerate convergence. Verification experiment demonstrated that the algorithm can reduce non-cutting movement of tool paths and improve machining efficiency significantly.
Study on the Multiple Objective Parameter Optimization Method for NC Turning
Authors: Liu Zhi Qiang , Zhang Mian Hao
Published: March 2010

Nowadays NC cutting processing has become one of the basic methods of machine manufacture. However, the single precision has failed to meet the demand for the modern manufacture. The surface roughness, tools wear and material removal ratio are used as the objective to research, the orthogonal experiment is built by the Taguchi methods, and the fuzzy analysis is adopted to set up semantic rules between turning parameter and the objects. Then the Taguchi method is used to obtain the optical turning parameter. The QTN200M-500U NC turning center is used to carry out the turning experiment; Results from the experiments could be used as the references for future manufacturing designs.
Research on Precision Accelerant Lapping Technology of GHz SAW CVD Diamond Films
Authors: Zhang Li , Wen Dong Hui , Xiao Feng Qing , Xu Zhen Hao , Yuan Qiao Ling , Ji Shi Ming
Published: March 2010

The fast development of SAW requests higher quality surface of CVD diamond films. Nowadays the mechanical lapping method is one important way to polish CVD diamond films, but the processing cost is high due to the low machining quality and efficiency. This paper reports a new accelerant lapping technology base on mechanical lapping and exploratory studies the role of three kinds of metal of the iron, titanium and nickel in the process of lapping. Firstly, ANSYS/LS_DYNA was used to simulate the process of friction and cutting between the CVD diamond films and abrasive plate of different material to analyze the temperature distributing on the interface and weather it is helpful for lapping. Then, experiment researches were carried out using the abrasive plate with different accelerant materials ratio. The results indicate that titanium is the most potent accelerant for polishing, followed by iron and then nickel. Experimental study also found that the accelerant lapping can carried out effectively by using the abrasive plate made of different metallic materials as accelerant to the diamond film grinding.
Study on the Surface Characteristics of Polishing Pad Used in Chemical Mechanical Polishing
Authors: Gao Hong , Su Jian Xiu
Published: March 2010

Studying the surface characteristics of polishing pad helps to understand and analyze the chemical mechanical polishing (CMP) mechanism and optimize the microscopic structure of polishing pad. The surface roughness, organizational structure, porosity, depth and diameter of micro-pore, distribution of asperity and profile bearing rate of IC1000/Suba IV polishing pad were studied with the profilometer ZYGO 5022, AFM and SEM. The results of measurement and calculation show that the surface roughness is 6.8μm , the root mean square ( RMS ) roughness is 9.4μm, the surface porosity is 56 % , the micro-pore average diameter is 36μm , the micro-pore average depth is 20μm , the micro-pore average spacing is 43μm , the micro-pore average volume is 550/mm2 and the asperity height obeys Gaussian distribution.
Research on Material Removal Modeling and Processing Parameters of Magnetorheological Finishing
Authors: Li Yao Ming , Shen Xing Quan , Wang Ai Ling
Published: March 2010

Magnetorheological Finishing(MRF) is an advanced optical manufacturing technology, It is a kind of deterministic process. It conquers the defections such as low-efficiency and low-grade surface quality of the traditional method. Deduced from the hydrodynamic lubrication theory of the Bingham plastic flow, the material removal model of MRF is established. The reliability of the model is verified by the experiment. finally, we get the mean Preston coefficient by the theoretical curve and the actual measured curves, the value will be applied to optical components of the computer-controlled MRF operation. Through the magnetorheological finishing experiments , the results that compared with the experimental results in good agreement prove that our proposed model is reasonable.
Technical Study on Neural Network Intelligent Setting for GAIM Processing Parameters
Authors: Wang Bing Quan , Zhang Zheng Wei
Published: March 2010

The defects in gas-assisted injection molding are mainly caused by processing parameters improper adjustment. The model for artificial neural network was developed, and was trained through the software platform MATLAB. By the bridle-wise network, the experimental parameters could be set quickly and intelligently. The correctness of these parameters was validated by CAE simulation.
A Preliminary Study of JDF-Based ERP System in the Printing Enterprises
Authors: Zhong Yun Fei , Peng Xiao Qi , Xiao Xi Yu , Zhang Qiao Li , Cheng Qian Kun
Published: March 2010

Job definition format (JDF) can carry out management and control during the whole printing processes while enterprise resources planning (ERP) system can help enterprises implement supply chain-based integrated management. Base on the analysis of JDF’s and ERP’s identities, according to their adaptability to the printing industry, we designed the combined system model of JDF workflow system and ERP management information system. Under the premise of the most optimal allocation of business resources, production management and information management of the whole printing process from order, production, and enterprise management to the logistics can be obtained.
Numerical Analysis on Porous Shunt Used in Magnesium Alloy Furnace
Authors: Xiang Chun , Ying Fu Qiang
Published: March 2010

In this paper , the author analyzed the influence factors of protection gas flow field, then established the model in a design of the optimized protection gas porous shunt, which is used in magnesium alloys furnace, Numerical simulation analysis optimizes the supplying system of protection gas. The shunt improves the uniformity and validity of the gas which is above the magnesium and reduces the gas consumption. The conclusion is that porous shunt usage will further promote the development and application of magnesium alloy in all fields.
Evaluation on Product Form Image Using Linguistic Variables Based Fuzzy Analytic Hierarchy Process
Authors: Shi Fu Qian , Wu Jian Feng , He Xiao Dong , Wang Hai Ning , Sun Shou Qian
Published: March 2010

Due to the uncertainness and fuzziness of image evaluation on product form, many fuzzy multi-criteria decision making approaches are applied in this fields. Fuzzy linguistic is usually used by expert to evaluate the importance of the criteria and to rate the alternatives; hence, we integrating fuzzy linguistic based analytic hierarchy process methodology to image evaluation of product form. Trapezoidal fuzzy number and 11-scale linguistic variables were applied in this model. The proposed approach started by a web-based image evaluation system, and then target products were extracted and divided in many design characteristics. Fuzzy linguistic based AHP was applied to generate the critical forms that ordered by vary image adjectives. A case study of mobile phone design was demonstrated the effectiveness.
NC Tool Selection System Based on Process Features of Part
Authors: Liu Zi Ran , Meng Kui
Published: March 2010

According to the basic features of the process features of parts, a concept of logical parts and logical tools is analyzed, and a tool selection method based on process features of parts are proposed. A system for management and selection of NC tools is developed successfully, and by this system an exchange among tool parts produced by the different manufacturers, and the intelligent selection of tools based on the process features can be realized. The present analysis can provide the basis for its applications.
Manufacturing Resources Optimal Selection and Rough Production Capability Estimation for Market-Driven Rapid Response Manufacturing
Authors: Cao Yan , Qin Zhong Bao , Cao Sen
Published: March 2010

Market-driven rapid response manufacturing demands manufacturing enterprises to increase their agility and robustness. This leads to more effective and efficient organization, management, planning and control of manufacturing resources in the manufacturing enterprises. In the paper, object-oriented method is adopted and UML is used to establish a manufacturing resource model. Then, all evaluation indices and corresponding hierarchical structure are established based on AHP. Then, the problem of rough capability estimation for Make-to-Order enterprises is described and discussed that deal with production orders of different delivery dates based on limited manufacturing resources. A rough production capability estimation system for Make-to-Order enterprises under limited manufacturing resources constraints is developed on Delphi 7 platform. The approach can be used to rapidly judge whether an enterprise has the capabilities needed to finish production orders on time, and to estimate a new order’s delivery date. The study of the paper lays the foundation for the future research of supply chain and distributed manufacturing.
Research on Air Nailer Comfort Evaluation Method and CAE Analysis System Development
Authors: Li Jun Yuan , Jiang Xian Feng
Published: March 2010

When designing the air nailer, in order to achieve the purpose of rapid analysis of design results, use of VB and APDL tools, secondary development of ANSYS, established a parametric CAE analysis module, template-based CAE analysis module, and profession CAE analysis module. And this three module is integrated into the air nail industrial design platform. As a result, designers can quickly and easily on the air nailer for CAE analysis. Meanwhile, in order to achieve in the 3D design of the system of the air nailer’s handle for comfort evaluation, an evaluation method is proposed. Analysis and demonstrated the principle of the method. Established a comfort evaluation model. On this basis, comfortable evaluation software is developed. Evaluation results generated by the software can be used as a reliable basis for revising shapes of handles.
Influence of Sulfur on the Microstructure and Properties of High Nickel Austenite Grey Iron
Authors: Liu Jin Hai , Li Guo Lu , Hao Xiao Yan , Zhao Xue Bo , Xia Xing Chuan
Published: March 2010

The influence of sulfur on the microstructure and properties of austenite grey iron with 14-16% Ni was studied. The results showed that the crystallizing temperature of primary austenite increases and the the eutectic temperature does not changes greatly with addition of sulfur. When the content of sulfur is lower than 0.046%, the undercooled graphite existed mainly, the hardness of austenite grey iron and the sensibility of cross section become higher. When the sulfur increases to 0.08%, the A type of flake graphite distributed mainly, and the hardness and the sensibility of cross section reaches the lowest. When the sulfur is over 0.11%, the dentritic primary austenite developed largely, the space interval of austenitic dentrite reduced, and a large amount of interdentritic graphite formed, and the hardness and the sensibility of cross section increased again. In additon, the surface roughness of machined casting is influenced by the morphology of flake graphite.
Roll Casting of Al-25mass%Si
Authors: Nakamura Ryoji , Saito Masayuki , Kumai Shinji , Watari Hisaki
Published: March 2010

Roll casting of Al-25mass%Si hyper eutectic aluminum alloy strip was tried by an unequal diameter twin roll caster. The casting speed was 10m/min. The thickness of the strip was about 2mm. The eutectic Si and primary crystallized Si were very fine by the effect of the rapid solidification. The size of the primary crystallized Si was not uniform at the thickness direction. The primary crystallized Si at the near surface was finer than that of inside. The eutectic Si was finer than 2μm. The strip could be cold rolled after hot rolling and annealing.
Numerical Simulation and Application of Electromagnetic Stirring in Ansteel
Authors: Jin Bai Gang , Chen Ming , Wang Jun , Li Li Xun , Liu Chun , Wang Wen Zhong
Published: March 2010

The numerical simulation and application experiment are used to research the electromagnetic stirring (EMS) in Angang steel company limited. The results show that the stirring effect in side to side position of EMS rolls is better than that in face to face position. And the stirring effect in triples zero patterns are better than that in the double butterfly patterns. The application effect of EMS in Ansteel is obvious. The equiaxed zone in different steel grade such as low carbon aluminum killed steel, pipe steel, silicon steel and high carbon steel is improved 12-25% with EMS. And the slab center segregation has an obvious decreased after using EMS.
Mechanical Properties of Heat Treated 30CrMo Steel Produced by Compact Strip Production
Authors: Jiao Guo Hua , Huang Gang , Wen De Zhi , Zhou Chun Quan , Wu Kai Ming
Published: March 2010

Mechanical properties of heat treated 30CrMo steel produced by CSP (Compact Strip Production) and conventional continuous casting process. Results showed that 30CrMo steel produced by CSP exhibits higher hardness than that produced by conventional continuous casting process. The higher hardness was attributed to fine-grained microstructures in the as-rolled CSP strips.
Secondary Phases Present in Spray Formed Al-10.5Zn-2.0Mg-1.5Cu Alloy
Authors: Guo Shu , Ning Zhi Liang , Cao Fu Yang , Sun Jian Fei
Published: March 2010

Al-10.5Zn-2.0Mg-1.5Cu alloy was produced by spray forming (SF) technique. The initial microstructure, particularly secondary phases, present in the as-SFed alloy was examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) with attached energy dispersive X-ray spectroscopy (EDS). The results indicated that the equiaxed α-Al grains have an average size of about 18-20 μm in diameter. The intergranular phase was identified as MgZn2 by selected area electron diffraction (SAED) pattern, which was also distributed in the grain interior as well as Al2Mg3Zn3. A needle-like Al23Cu(FeCrMn)4 precipitate was detected. The combined analysis of morphology and crystallographic structure suggested that the Al23Cu(FeCrMn)4 grew along its long axis of <001> orientation. The refinement of the intergranular phases occurred, which is probably due to a decreased amount of eutectic liquid phase finally solidifying on a large area of grain boundaries.
Preparation and Mechanical Properties of Al2O3/TiCN Sandwich Nanocomposite Ceramic Tool Materials
Authors: Li Y.Z. , Zhao Jun
Published: March 2010

A model for designing sandwich nanocomposite ceramic tool materials with symmetrical distribution was presented. By adding nano-sized Al2O3 particles into the submicro-sized Al2O3 and TiCN, Al2O3/TiCN sandwich nanocomposite ceramic tool materials were fabricated by means of powder-laminating and hot-pressing technique. The experimental results showed that optimal mechanical properties were achieved for the composite with the addition of 35 vol.% TiCN particles in the middle layer and 45 vol.% TiCN particles in the outer layers, layer thickness ratio is 0.3, with the flexural strength reaching respectively 900MPa，fracture toughness and Vicker's hardness in the surface layers being 6.5MPa•m1/2 and 19.2GPa.
An Experimental Study of Fine Powder Comminution in a Dual Cone Impact Mill
Authors: Hu Guo Ming , Liu Li Ping , Wan Hui , Liu Yu
Published: March 2010

Aimed principally at increasing the impact velocity of the particle assuming a given circumferential velocity and to achieve collinear collision of particles by a mechanical method with a consideration on energy saving for comminution, a prototype dual cone impact mill was designed and built. This dual cone impact mill mainly consists of two cone disks with the same geometrical dimensions, and the same rotational speeds rotating in opposite directions. There are no grinding media in the dual cone impact mill. The dependence of the comminution effect on two parameters, cone disk speed and air flow rate, was experimentally investigated. The results obtained from grinding quartz and cement clinker indicate that this prototype mill can be used for grinding materials of Mohs hardness up to of 6-7, while achieving mean particle sizes of 10  m.
Thermoelectric Properties of Iron Disilicide Prepared by Field-Activated Synthesis Process
Authors: Meng Qing Sen , Ding L.Z. , Chen R.X. , Fan Wen Hao , Wang L.Q.
Published: March 2010

Iron disilicide（-FeSi2）compounds were synthesized by field-activated pressure assisted synthesis (FAPAS) process, and their thermoelectric properties were measured. Fine microstructure with small pores was obtained in the fabricated samples. The average grain size was approximately 0.3 m. The thermal conductivity in the temperature range of 300-725 K was 3-4 Wm-1K-1, which was considerably lower than that of the same materials synthesized by other methods including SPS process. Lower thermal conductivity provided a higher figure of merit, ZT of 28.50×10-4 in the temperature range of 330-450 K.
Analysis of the Stress Invariants Criterions for I-II Mixed Mode Crack Initiation Angles
Authors: Li Dong Xia , Zhu Yan Zhi
Published: March 2010

Crack propagation in practical engineering problems is often of mixed-mode type. The analysis of mixed-mode I–II crack initiation angles under different loading conditions is presented using stress invariants criteria. Where I1 and I2 are the first and the second stress invariants, IP-criterion postulates that crack will propagate along the direction defined by a maximum value of IP along the elastic–plastic boundary defined by von Mises. The mixed-mode I-II crack initiation angle is predicted successfully and is agree well with experimental data.
Study on the Mechanism of the Cobalt Leaching of Cemented Carbide in Triethanolamine Solution
Authors: Zhang Xiu Ling , Jia Xiao Ming , Lian Jian Xiao
Published: March 2010

The reactionary trend of the triethanolamine and cobalt in cemented carbide and the mechanism of cobalt leaching have been investigated by soaking experiments, friction experiments and electrochemical gaging experiments. The experimental results reveal that triethanolamine is prone to form coordination compound with cobalt ion .The amount of cobalt’s element leaching from cemented carbide is added up with the increase of time and triethanolamine concentration. So when using cemented carbide cutting tool, the water-based cutting fluid containing triethanolamine addictive should be avoided.
Stress Field of Semi-Infinite Interface Crack Tip of Double Dissimilar Orthotropic Composite Materials
Authors: Li Jun Lin , Zhang Shao Qin
Published: March 2010

The problem of orthotropic composite materials semi-infinite interfacial crack was studied, by constructing new stress functions and employing the method of composite material complex. In the case that the secular equations’ discriminates the and theoretical solutions to the stress fields and the displacement fields near semi-infinite interface crack tip without oscillation and inter-embedding between the interfaces of the crack are obtained, a comparison with finite element example was done to verify the correction of theoretical solution.
The Microstructure of Polyaniline Coatings Electropolymerized on Pb Substrate in Aniline+Oxalic Acid Electrolyte
Authors: Long Jin Ming , Zhu Xiao Yun , Guo Zhong Cheng
Published: March 2010

The electropolymerizition of polyaniline (PANI) on Pb substrate was performed by potentiostatic or galvanostatic method in aniline＋oxalic acid electrolyte. The PANI coatings were characterized by FTIR, XRD and SEM methods. The results showed that the PANI coatings have a crystalline-amorphous composite structure whose degree of crystallinity is about 30%~50%. They belong to a conducting emeraldine salt form and contain varied amounts of water (hydrated PANI salt). The PANI coating synthesized at low current density is in a more reduced state. There is a fibrillar-like morphology for the PANI coatings electrodeposited on Pb substrate.
Study on the Preparation and Alleviating Fretting Wear Property of Ni-Tl-B Coatings on Steel
Authors: Song Dan Lu , Yang Ling Ling , Shi Xiao
Published: March 2010

Both of coating with lead nitrate as stabilizer (common Ni-B coating) and coating with thallium sulfate as stabilizer (Ni-Tl-B coating) were prepared on steel substrates. Meanwhile, different Ni-Tl-B coatings were also prepared by changing the content of thallium salt in solution. Several kinds of process of electroless plating Ni-B were introduced. Surface morphology was observed with TM-1000 scanning electron microscope, and the alleviating fretting damage property was tested on DELTALAB-NENE high-precision hydraulic servo fretting wear tester. The results show that: The more content of thallium salt, the rougher the surface morphology of coatings is. When the content of thallium salt in plating solution is 2mg/L, the coating has the best alleviating fretting damage property with the coefficient of friction 0.12 in running-in stage.
Oxygen Evolution Kinetic Parameters of Electrodeposited Composite Inert Electrodes
Authors: Xu Rui Dong , Wang Jun Li , Guo Zhong Cheng
Published: March 2010

Pb/WC-ZrO2, Pb/Ag-WC-ZrO2, Pb/WC-ZrO2-CeO2 composite inert electrodes were prepared on aluminum alloy substrate by electrodeposition method from fluorboric bath containing suspension of WC, ZrO2, CeO2 and Ag particles. The stable state polarization curves of oxygen evolution and liner regression curves were obtained. Compared with Pb-1%Ag alloy, the oxygen evolution overpotential of Pb/10.02%WC-3.58%ZrO2, Pb/0.84%Ag-10.01%WC-3.64%ZrO2 and Pb/5.84%WC-2.29%ZrO2-1.32%CeO2 inert electrodes is lower in the range of 12-27mV, the exchange current density is higher two magnitudes above, showing that their catalytic activity of oxygen evolution is better.
Temperature Field Simulation for Aluminum Alloy Surface Modification by Scanning Electron Beam
Authors: Sun Pei Xin , Wang Rong , Wei De Qiang
Published: March 2010

According to the actual experimental condition and theoretical analysis, a finite element model was established to describe the surface modification process of scanning electron beam of 6A02 aluminum alloy. The phase change process and thermal radiation were considered in the simulation. The temperature simulation revealed the ultrahigh rate of the heating and cooling, rapid melting and re-solidification within seconds in the range of millimeters in depth. The calculated melting zone was an irregular semicircle, the x-axis length was about 2.9mm, and the axial depth was about 1.4mm. This research will predict the melting condition.
Amorphization of Fe-Ni Based Alloys by Laser Cladding and Remelting
Authors: Zhang Pei Lei , Li Zhu Guo , Yao Chen Wu , Yao Shun , Lu Feng Gui
Published: March 2010

The Fe32Ni32Si16B18Nb2, Fe31Ni31Si18B18Nb2 and Fe30Ni30Si20B18Nb2, (at. %) alloys are synthesized using low purity of raw materials by high power CO2 laser cladding with synchronous powder feeding. X-ray diffraction results show that the coating has an amorphous structure with some crystalline phases on it. The microstructure of the coatings changes with different amounts of Si. It can be observed that black nanocrystalline grains embedded in the amorphous phase in the TEM image. The coating of Fe31Ni31Si18B18Nb2 alloy was annealed at different temperature for 30 minutes and the microstructure were investigated. The highest Vickers Hardness had exceeded 1300 in the coatings. The amount of Si is a critical factor for fabricating a Fe-Ni based amorphous composite coating.
Brush Plated Multilayered Cu/Ni Coating from a Single Electrolyte and its Fretting Wear Behaviors
Authors: Qian Yao Chuan , Tan Jun , Yang Hong Jun , Hu Zhong Xiang
Published: March 2010

Brush plated of Cu/Ni multilayer coating from a single sulfate electrolyte was prepared. The influence of applied voltage on the composition of the deposit and deposition rate was investigated to optimize the plating parameters. Wear tests were carried out in ball-on-plate geometry unlubricated. Wear scar morphology was observed using scanning electron microscopy and optical microscopy. It was found that the brush plated multilayer coating was highly dense and free from porosity. The multilayer coating showed less wear than Ni coating brush plated from the same solution. The increase in the wear resistance of the multilayer coating was attributed to lubricating effect of the transform film formed by Cu wear particles.
Study on the Impact of Fine-Blanking with Negative Clearance on the Materials Microstructure and Hardness
Authors: Fan W.F. , Li J.H. , Zhang Zhong Mei
Published: March 2010

The Fine-blanking with negative clearance processing is very complicated process because the blanking clearance is negative clearance, for this reason, the state of stress and strain in sheet inside are also more complicated than conventional blanking. In the process of fine-blanking with negative, plastic deformation of the material is fiercer than conventional blanking, and the change of material inner structure and hardness is more intense because of plastic deformation. The deformation principle of fine-blanking deformation with negative clearance is analyzed by means of streamline and metallographic photograph and micro hardness. The impact of fine-blanking with negative clearance on the materials microstructure and hardness is discussed. The research result indicates that the hardening value is 1.8 times than original material itself and the maximum harden depth is 2.2mm for AISI-1045 steel in the process of blanking with negative clearance. Therefore, it could enhance fatigue strength and the working life of workpiece greatly because of the improvement of the material inner structure.
Adaptability Study of an Ideal Linear Elastic Constitutive Model for a Plasma Sprayed Ceramic Thermal Barrier Coating
Authors: Hu Hao Ju , Zhang Jian Yu , Fei Bin Jun
Published: March 2010

A finite element simulation of a plasma sprayed thermal barrier coating(TBC) system was conducted. Plasma sprayed thermal barrier ceramic coating was treated as either a simple elastic model or an advanced viscoplastic model which includes rate dependence and unequal flow stresses in tension and compression. Predicted tensile stresses emerging in the ceramic plane at the elevated temperature never become large enough to cause surface cracks based on elastic analysis, so does using the viscoplastic model. At the low temperature, these two models identically show that the ceramic coat will locally cracks at the “peak” location. It is shown that although there are some numerical differences in these two models’ predictions, elastic analysis predicts accurate in failure mechanism analysis based on stresses
Effect of Sulfurizing Temperature on Formation of Coatings Produced by Nitriding-Sulfurizing Composite Treatment for Ti-6Al-4V Alloy
Authors: Wang Li Jie , Xing Ya Zhe , Wang Hong Bo , Hao Jian Min
Published: March 2010

Three composite coatings were prepared by nitriding-sulfurizing processing of Ti-6Al-4V alloy at different sulfurizing temperatures. The microstructure and phase structure of the coatings were examined by scanning electron microscopy (SEM) and X-ray diffraction (XRD), respectively. Furthermore, the hardness of the coatings was measured. The effect of the sulfurizing temperature on microstructure of coatings was investigated. The results indicated that the composite coating was mainly comprised of titanium nitrides, titanium sulfides, and titanium. It was found that the phase composition of composite coating changed with the variation of the sulfurizing temperature.
Vibration Suppression of Flexible Beams Using MR Elastomers
Authors: Wei Ke Xiang , You Hong , Xia Ping
Published: March 2010

Magnetorheological (MR) elastomers are smart materials whose physical properties can undergo instantaneous and reversible change when subjected to different intensities of the magnetic field. This makes the MR elastomers have wide applications in the fields of vibration control. This work presents the vibration suppression of flexible beams with MR elastomers. An experiment system has been set up to investigate the vibration performances of a sandwich beam filled with MR elastomers. The vibration response of the beam subjected to different magnetic field intensity and excitation frequencies are demonstrated and evaluated. The results obtained indicate that vibration attenuation is achieved at different operating conditions by applying a magnetic field to the beam.
Reasearch on Heat-Shocking Resistance of SiC(w)/ZrO2-MoSi2 Ceramic Composites
Authors: Ai Yun Long , Liu Chang Hong , Liu Zi Qian , He Wen , Zhang Jian Jun
Published: March 2010

The heat-shocking resistance of SiC(w)/ZrO2-MoSi2 ceramic composites prepared by hot-pressing sintering was studied by indentation-quench method together with the calculation of the crack propagation rate of ceramic nanocomposites. The results showed that the crack propagation rate of MoSi2 matrix ceramics samples decreased remarkably with the addition of ZrO2 and SiC nanoparticles. The crack propagation rate of SiC(w)/ZrO2-MoSi2 ceramic composites was obviously lower than that of ZrO2-MoSi2 ceramic composites, which revealed that the synergism between SiC(w) and ZrO2 was more advantageous to enhance the heat-shocking resistance of MoSi2 ceramic. Moreover, the ability of ZrO2 particles to hinder the heat-shocking crack propagation was better than that of SiC whiskers. The synergism between SiC(w) and ZrO2 changed the crack propagation path and shape in MoSi2 ceramics. The mechanisms of ZrO2 to improve the heat-shocking resistance of the MoSi2 ceramic were mainly phase transfer toughening, while that of SiC whiskers to improve the heat-shocking resistance of the MoSi2 ceramic were mainly crack deflection and bridge union.
Reaction Mechanism of an Al-TiO2 System
Authors: Zhu He Guo , Min Jing , Ai Ying Lu , Wu Qiang
Published: March 2010

The reaction mechanism of an Al-TiO2 system is discussed. Thermodynamic analysis indicates that the reaction between Al and TiO2 can occur spontaneously due to the negative Gibbs free energy of the Al-TiO2 reaction system. When the reinforcement volume fraction is 30%, there is an endothermic peak and an exothermic peak in the DSC curve. But when the reinforcement volume fraction increases to 100%, there are two independent exothermic peaks and the height of them increases obviously. With increasing the heating rate, the ignite temperature becomes higher and all the peaks move to the higher temperature direction. The reactions between Al and TiO2 consist of two steps: first, Al reacts with TiO2 to form the stable α-Al2O3 particles and the active Ti atoms; second, the active Ti atoms react with Al to form Al3Ti.
Microstructure Evolution and Mechanical Behavior of CNTs/ AZ31 Magnesium Alloy Composites Processed by Equal Channel Angular Pressing
Authors: Zhou Guo Hua , Zeng Xiao Shu , Xu Qiang
Published: March 2010

Carbon Nanotubes /AZ31 alloy composites were fabricated by joining preform of CNTs during melting under the protection of Ar. Composites were prepared by means of equal channel angular pressing ( ECAP) by Bc route in the die with the intersecting angle of 90°. Effects of the pressing passes on the microstructure and the mechanical properties of composites during ECAP were investigated; The fractographs were observed and analyzed via scanning electron microscope (SEM). The results indicate that a great deal of ultra-fine grains appear in CNTs/AZ31 Alloy Composites just after one pass of ECAP; With the increase of pass number, the proportion of ultra-fine grain increases. With 4 pressing passes, the grains are effectively refined to a mean size of 2 μm. And with increasing in the pressing passes, elongation of the composites is increased and the tensile strength is decreased as a result of the refinement of grain size. CNTs were broken under high shearing stress, and the particle distribution in the matrix alloy was homogeneous.
Design, Production and Mechanical Property of White Engineered Cementitious Composites
Authors: Yu Jia Huan , Dai Yu , Song Bin
Published: March 2010

In this paper , white ECC design framework – scale linking which represents a holistic approach in composite design accounting for the interaction between the fiber, matrix, and interface are proposed. New white ECC showing pseudo strain hardening behavior with over 1.3% of strain capacity under tension are produced. Uniaxial tensile tests and single fiber pullout test of PVA white ECC are conducted to quantify the interfacial bond properties of white ECC. It is shown that lower frictional bond in white ECC may be attributed to the absence of fly ash in white ECC mix design. The mechanical performance of white ECC can be further enhanced by improving fiber bridging capacity.
Transverse Elastic Deformation Behavior of Aligned Fiber Bundles under Bulk Compressive Pressure and Longitudinal Stress
Authors: Xing Jing Zhong , Chen Li , Li Jin Chao
Published: March 2010

Advanced composite materials generally use fiber in very high volume fraction, compression of textile/perform is adopted in manufacture processes. The major role of the compaction process is to obtain high fiber volume fraction in final parts. During the compaction process, transverse compaction of textile/perform is the main deformation form, where the compaction behavior of a fiber bundle is the most basis issue. In this paper, a micromechanical model of aligned fiber bundle with high fiber volume fraction was developed to investigate elastic deformation behavior under bulk compressive pressure and longitudinal stress. Bending characteristics of a waved fiber was established to describe the transverse bulk compression and the longitudinal deformations of a bundle. A wave amplitude was introduced to describe initial distance between fibers, which affects the initial fiber volume fraction and the transverse deformation feature. An improved representative fiber cell was present to get the deflection of a bending fiber under transverse and axial force. Randomly distributed directions of waved fibers lead to a more reasonable representative fiber cell, which influences initial fiber volume fraction and leads to logical deformation explanation and symmetric constitutive relation for aligned fiber bundle with high volume fraction. Analytical formulae to describe the constitutive relationship of fiber bundle under transverse and longitudinal stress were present. Numerical results show that the transverse bulk compressive stress and its deformation are related to wave amplitude and available fiber volume fraction. The comparison to present literatures was given to show the improvement of the model.
Fracture Characteristics for Crack Tip near the Interface between Steel and Concrete in Composite Structures
Authors: Xiong Mei
Published: March 2010

Steel-concrete composite structures are widely used in high buildings for its excellent seismic behaviors, whereas faults or cracks, which have great influence on interfacial mechanical behaviors of structural members, inevitably form near the interface between steel and concrete during the process of molding. Therefore, it is necessary to study the mechanical characteristics of the crack tip near the interface. In this paper, the application scope of the path-independence of J-integral in steel-concrete composite structure with a crack is discussed. According to the conservation law of J-integral for the steel-concrete composite structure with a crack parallel to the interface, a hypothesis that the value of strain energy release rate (SERR) of the mode-I fracture is independent of the crack location when the crack is parallel and close to the interface is put forwarded. And this hypothesis is verified through finite element method (FEM). A schematic model for a skew crack near the steel-concrete interface is provided. The variation law of SERR with the Dundur’s parameters and the angle between crack direction and interface are calculated by FEM. At last, calculating method of the stress intensity factor as well as the SERR for a skew crack near the interface is suggested. All these may contribute to further investigation on interfacial mechanical behaviors for steel-concrete composite structure.
Study on Reaction Synthesis Mechanism of TiC-Al2O3 Particle Co-Reinforced Aluminum Based Composites
Authors: Zhang Rui Ying , Shi Zhi Ming , Huo Ri Chang
Published: March 2010

TiC-Al2O3 particles were fabricated in situ by contact reaction（CR） in an Al–Ti2O–C system. The reaction behavior and formation path of Al2O3, TiC were investigated. Results show that the reaction temperature for the CR is higher than that for the directly sintering due to different thermal conductibility of mediums. The typical layered reaction products were observed. A proposed core–shell model explained the structure formation for the CR composites. Al3Ti and Al4C3 were suggested transition phases during the contact reaction process.
Mechanical Evaluation of the Production of Bamboo Charcoal/ Stainless Steel Complex Yarns and Knitted Fabrics
Authors: Chen An Pang , Lin Chin Mei , Hsieh Chien Teng , Yang Yi Chang , Lou Ching Wen , Lin Jia Horng
Published: March 2010

In this study, bamboo charcoal/ stainless steel complex yarns was made of stainless steel wires and polyester bamboo charcoal filaments using a rotor twister machine. The stainless steel wires served as the core yarns while the polyester bamboo charcoal filaments served as the wrapped yarns. The speed of rotor twister was set as 7000 to 11000 rpm and wrapped counts were 2 to 7 turns/ cm. Bamboo charcoal/ stainless steel complex yarns were with the tenacity as 3.08 g/d when manufacture parameters were speed of rotor twister as 8000 rpm and wrapped counts as 4.0 turns/ cm; moreover, when speed of rotor twister was at 7000 rpm and wrapped counts was 5.0 turns/cm, bamboo charcoal/ stainless steel complex yarns received the tensile strain as 24.91%. According to tensile strength test for knitted fabrics, when wrapped count was 4 turns/ cm, the knitted fabrics had its tensile strength as 214.49 N, and the vertical tensile strength was higher than the horizontal one. When the wrapped counts of bamboo charcoal/ stainless steel complex yarns was 6 turns/ cm, the knitted fabrics attained its tensile strain at 236.87%.
Manufacturing Process of Sound Absorption Composite Planks
Authors: Lin Jia Horng , Liao You Cheng , Huang Chao Chiung , Lin Chia Chang , Lin Chin Mei , Lou Ching Wen
Published: March 2010

In this study, the basic material for sound absorption was porous nonwoven made of polyester nonwoven and low-melting polyester fiber. Nonwoven was then attached with foam polyurethane as composite plank for sound absorption and sound isolation. We used two microphone impedance tubes for sound absorption test and INSTRON 5566 mechanical testing machine for tensile test. The optimum sound absorption coefficients as 0.67 ± 0.008 was obtained when density of foam polyurethane was 1.0 Kg/m3 with thickness of 20 mm; Polyester nonwoven were 9 layers; and low-melting polyester fiber was 30 wt% with thickness of 10 mm. Specimens obtained the maximum fracture stress when it contained low-melting polyester fiber at 30~40 wt%. The results of this study could be applied in the partitions inside ships, vehicles or buildings.
Cutting Mechanism of Multi-Tooth Tool for Manufacturing Metal Fibers
Authors: Tang Yong , He Zhan Shu , Wan Zhen Ping , Wang Jia Bao
Published: March 2010

In order to manufacture slim long metal fibers efficiently, a new type multi-tooth tool is developed. multi-tooth tool has chip-splitting action, namely the whole cutting layer will be split into pieces of metal fibers as all tiny teeth contacting the workpiece are involved in cutting. The oblique cutting model of multi-tooth tool and that of a tooth in the tool are built. The formation mechanism of metal fiber cross section is presented according to different feedrate.
Determination of the Anti-Chatter Weak Component on a Machine Tool
Authors: Huang Qiang , Zhang Gen Bao
Published: March 2010

The processing stability of machine tool system is studied in this work. In terms of the mass distribution and the need of sufficient energy to keep chatter, it is most possible that the chatter will occur on the final executive component of a machine tool. Based on it, the machine system may be simplified as a regenerative chatter model with double elastic bodies. This new model can adapt to improvement of component structure well. When there is a big difference between the receptances of two elastic bodies, the one with bigger receptance should become the active body of chatter, namely it is the weak one of the system. When the receptances of two elastic bodies are close, then the structure of two bodies should be optimized.