bluuebunny/crossref_metadata_2025 huggingface dataset:
Three-Dimensional Thermal Analysis of Spherical Plain Bearings with Self-Lubricating Fabric Liner
Authors: Cao Lei , Shen Xue Jin , Li Ru Yan
Published: March 2010

Finite element analysis and corresponding experimental comparisons of temperature were performed to investigate the thermal behaviour of spherical plain bearings with self-lubricating fabric liner. Based on the theory of heat transfer, tribology and composite material mechanics, a sequentially coupled, 3D, thermo-mechanical finite element analysis model of the bearing system was built up, in which the steady-state temperature distribution from the thermal analysis was applied as a body load to the structural model. As a result, the maximum steady-state temperature of 78.1°C, von Mises stress of 299MPa, displacement of 0.0806mm along Z axis of the bearing are presented, together with the maximum contact pressure of 324MPa which are significant in the structural design and optimization of these bearings. The effect of temperature rise on the contact pressure distribution is discussed. The agreement of the temperature computation results with the experimental data indicates that this method could be used to analyze virtually any such bearing.
Partial Matching Algorithm of 3D CAD Models Based on the Constraints of Transition Features
Authors: Zhang Kai Xing , Zhang Shu Sheng , Bai Xiao Liang
Published: March 2010

The CAD models of mechanical parts usually have many blends and chamfers, and the existence of these machining features can greatly change the geometric and topological patterns of the CAD models, but the existing partial matching algorithms cannot match the CAD models which contain machining features such as blends and chamfers. In this paper, a new approach to partial matching based on the constraints of transition features is proposed. Firstly, the transition features are identified by feature recognition, and then these machining features are removed to eliminate the impacts to the geometric and topological information of the CAD models, and the attribute adjacent graph is reconstructed, finally, the sub-graph isomorphism approach is used to achieve the partial matching. Experimental results show that this method can achieve partial matching of CAD models which contain machining features such as blends and chamfers, and the matching efficiency can satisfy the requirement of the engineering retrieval.
A Multi-Agent Based Tool Path Planning Method for STEP-NC Compliant Milling
Authors: Du Juan , Yan Xian Guo , Chen Zhi
Published: March 2010

Today a new model of data transfer between CAD/CAM systems and CNC machines, called STEP-NC, is being developed by the ISO technical Committees. It overcomes the shortcomings of ISO 6983 by specifying machining processes rather than machine motion, using the object-oriented concept of working step. Although the STEP-NC contains abundant geometry information of part and associated process parameters, the tool path is general not included in the STEP-NC program. So before the beginning of the STEP-NC-compliant CNC machining, the tool path should be firstly designed. By analyzing the characteristic of STEP-NC data model for milling, a working step-oriented tool path planning method for milling was proposed in this paper, and the distributed artificial intelligence methods, namely collaborative multi-agent was employed to accomplish tool path planning. Firstly a multi-agent architecture was constructed to allow multiple agents to work cooperatively to realize automation of tool path planning, and then, the function of every kind of agent and the communication between the agents were all described in detail. At last, one test component was designed and simulated to demonstrate the capabilities of this research in the paper.
Research on the Rapid Slicing Algorithm Based on STL Topology Construction
Authors: Yang Guang , Liu Wei Jun , Wang Wei , Qin Lan Yun
Published: March 2010

Constructing the topology of STL file efficiently is a key factor to improve the efficiency of slicing algorithm. In this paper a topology construction algorithm based on Standard Template Library set containers and a rapid slicing algorithm are developed. The algorithm developed removes a large number of redundant vertices, and only calculates intersection per triangular facet with slice plane once, and attains another point of intersection directly from the adjacent relations. In addition, the algorithm can reduce the times of traversing and sorting for the triangular facets, and also the times of calculation of intersection in the slicing processes, which results in the simplification of the process of constructing the slice contour, consequently the efficiency of the slicing algorithm is improved.
Toolpath Algorithm for Complex Pocket on the Network Optimization
Authors: Zhao Zhen Yu , Tang Fei , Liao Long , Liu Bai
Published: March 2010

On the consideration of connection of offset contour, deletion of interferential contour loop and accurate generation of toolpath in pocket machining, the linking of the pocket toolpath is paid close attention to, and an algorithm based on network optimization for complex pocket is brought forward. The introduced Dijkstra algorithm which is positive cost and directed cycle can accurately connect the vertexes of line segment and arc graph elements, and generate the shortest toolpath. The contour parallel toolpath algorithm can deal with linking of pocket with islands. Based on the techniques, experimental results are given to verify the proposed approach.
Research on Structure Rationalization Method of Product Family and its Application
Authors: Liu Fu Yun , Song Su Jing , Kuang Bing
Published: March 2010

In product configuration of mass customization, the structure of product family is one of the key factors which affecting the efficiency of configuration. Applying complex network theory and algorithm to mass customization field, a structure network of product family is constructed. The evolving rule of used number of class module variation with the number of product is obtained. The instantiation module number contained by a class module variation with the number of product is obtained. The evolving rule of used number of instantiation module variation with the number of product is obtained. A structural rationalization method of product family is presented. As an example, all methods are applied to a steam turbine product family, and the methods are verified.
A 3D Modeling System for Construction Work Simulation Based on Rendering and Dynamic Engines
Authors: Wang Xin , Zhang Jing , Gao Shun De , Wu Di
Published: March 2010

Modeling System for Construction task Simulation (MSCS) presented in this paper is a 3D computer-aided drawing tool which is designed for construction task planners. It is based on OGRE (Object-oriented Graphics Rendering Engine) and Bullet Dynamic Engine, therefore the model created by MSCS has both geometric and dynamic properties. MSCS has already been used in Crawler Crane’s Lifting Simulation System which is developed by Dalian University of Technology in China to draw the work environment and the loads to be lifted.
Design and Analysis of MEMS-Based Actuator
Authors: Liu Shuang Jie , Hao Yong Ping
Published: March 2010

One Micro-Electro-Mechanical System(MEMS) based actuator that fabricated by LIGA (Lithographie ,Galanoformung and Abformung) technology was designed to distinguish the change of the exterior condition. In order to prove whether the parts in the actuator intervene each other during motion, ADAMS software was utilized to simulate the motion. The rigid-flexible coupling dynamic modeling of the design was obtained by combining finite element method (FEM) with Lagrange equation, the mathematics modeling was solved with Gear method in ADAMS. The results showed that the MEMS-based actuator could move smoothly, and the simulated curve meets the intent.
Research on Comfort Evaluation Method of Tool Handles
Authors: Li Jun Yuan , Jiang Xian Feng
Published: March 2010

Based on requirements of evaluation on comfort level of hand-held tool handles, this essay put forward an evaluation method as well as analyzed and proved its principle, established a corresponding evaluation mode, deliberated index and computation module for comfort level of tool handles. The authored also developed a set of software to evaluate comfort level of tool handles. With this software, one can efficiently evaluate the comfort level of tool handles and an evaluation report will be made automatically, which can serve as a reliable basis for revising shapes of handles.
Matching Technology of Point Cloud Models Based on Combination Features
Authors: Zhang Xu , Zhang Xue Сhang , Li Jiqiang , Li Jiang Xiong
Published: March 2010

A combination features based technology is proposed to matching point cloud models. Firstly, automatically segment the point cloud to get ruled shape data from which the statistics features are extracted. Calculate the distance and angle between component elements of statistics feature and datum plane. The distance and angle constraints are introduced to automatically search correspondence statistics features of overlap region and the optimal combination of statistics features. The optimal combination is coupled for combination feature. If combination feature can completely identify pose of model, we call this as completely matching question; otherwise, this is called as partly matching question. For the latter, adjust the degrees of freedom which are not constrained and then precisely match the models using ICP algorithm. The examples show the proposed algorithm is simple and efficient, and the matching results are stable, reliable and convergent to a global optimal solution.
Distributed Monitoring System of Multi-Machine Tools Based on Wireless Sensor Network
Authors: Han Chun Guang , Guo Yin Biao , Li Hua , Jiang Chen
Published: March 2010

In ultra precision machining processes, an effective monitoring system can maintain machine tools in the best condition and delay the occurrence of tool wear and improve the quality of workpiece. In this paper, a distributed system is developed for monitoring of multi-machine tool based on wireless sensor network. Firstly, the sensor in the machine tool is responsible for the information collection and data processing. Secondly, the wireless network is used to transmit the data or receive the commands from the computer of control center. Finally, the computer will monitor the overall system and generate the alarm signals or the commands when the change of environment information occurs. The experimental results have shown the effectiveness of the proposed distributed system.
Investigation on the Contour Curve of Straighter Roll by Conjugate Revolving Quadric Theory
Authors: Du Xiao Zhong , Yang Quan , Sun Bin Yu , Zhang Xiao Ping , Wang Xiao Chen
Published: March 2010

Bar straightening is an important work before the bar is applied as qualified products. In this paper, the mechanics of the straightening process is analyzed in detail on the base of conjugate quadric theory. A simulation program is developed with the investigation of straightening process as well. The equations, which describe roll contour curve and the longitudinal section, are given and simulated in computer. And a brief method of designing and drawing the straightening roll contour curve is introduced.
Experimental Modal Analysis of CNC High Precision Surface Grinder with Horizontal Spindle and Rotary Table MGK7350
Authors: Cai Yong , Weng Ze Yu , Zhang Nan Nan , Yang Jin Hua , Yuan Wei Hua
Published: March 2010

The dynamic characteristic of CNC high precision surface grinder with horizontal spindle and rotary table MGK7350 was studied by using modal test. Through the analysis of modal parameters, the weak links were pointed out.
Effective Treatment of the Simulation Analysis under some Complicated Conditions
Authors: Chen Zhi Xin , Guo Chen , Zhang De Hai
Published: March 2010

Many of simulation analysis were carried out under the complex conditions, and in general it will use some viable treatment, so get the reliable results. However, some external force rather complex or can not be directly measured, and some material properties is complex and can not be described by existing parameters, then the direct simulation analysis is not feasible and must have a different effective treatment. This paper narrates the comprehensive simulation analysis of mold cavity and core deformation with complex force by some analysis soft wares, and carries out data processing, data transmission, and gets the final feasible results, it can provide a reference example for the similar situation. Then explores the main issues about the performance of clad metal for simulate analysis, and holds that the relevant performance parameters obtained by experiment and simulation combined are also effective and feasible.
Applying Fuzzy Neural Networks and Gray Theory to Construct a Modular Product Customization System
Authors: Chen Miao Sheng , Hung Fei Kung
Published: March 2010

This research establishes a “Customized modular product system”. Modular products can be defined according to their different functions and components. To build the learning and searching evaluation model of this system, the back-propagation neural networks and gray theory were used. Besides, Fuzzy theory and analytic hierarchy process were also utilized to model the relation and evaluation algorithms. In this way, it can provide neural networks with basic learning rules and a training samples. Based on different degrees of the consumer demand, the proposed method in this research performs the optimal module-combination for modular products. It will guide the customers to select the most suitable modular product group. Additionally, through the study case of the baby stroller manufacturing company, how to achieve the purpose of customization can be illustrated.
The Investigation of Partial Penetration Lap Laser Welding Applied on Stainless Steel Railway Vehicles
Authors: Wang Hong Xiao , Wang Chun Sheng , Shi Chun Yuan , Xiao Jing Fei
Published: March 2010

The current stainless steel railway vehicles body and structure are usually assembled by resistance spot welding process. The weak points of this process are the poor surface quality and bad airtight due to the pressure of electrodes. In this study, the partial penetration lap laser welding process was investigated to resolve the problems. The effects of the laser welding process parameters such as laser power, welding speed and focused distance to the shape of the weld seam and the shear tensile strength were discussed to find the optimal parameters. And the mechanical tests and microstructure analysis were also taken in this study. The optimal parameters are P=2.0kW，S=22mm/s，F=0mm. This work has great significance of improving the manufacturing level of stainless steel railway vehicles.
Study on Chemical Mechanism of Laser and Fluid Corrosion Combining Processing
Authors: Yuan Gen Fu , Yao Yan Sheng , Ma Yu Ping , Liang Hua Qi
Published: March 2010

Medium plays an important role in the laser and fluid corrosion combining processing. Through X-ray diffraction analysis of chemical composition on the tool steel surface after laser-chemical processing, its chemical resultant is researched and analyzed. And the chemical reaction process of the laser and chemical hybrid etching of the tool steel material is explicated. Applied electron microscopy to surface morphology observation, under the action of laser beam, the effect of different chemical media corrosion on tool steel material is studied. The chemical mechanism of material removal of combining processing of laser and chemical corrosion on tool steels is discovered.
Interfacial Microstructure and Phase Constitution of the Cu/Al Dissimilar Metals Joint Made by Contact Reactive Brazing
Authors: Zhang Hong Tao , Cao Jian , Lu Hao
Published: March 2010

Joining Cu to Al has been carried out by vacuum contact reactive brazing without filler metal. Experimental results obtained showed that the eutectic structure and some Cu-Al intermetallic compounds were the main phases of the braze seam. The fracture surface of the joint presented typical brittle fracture for the existence of intermetallic compounds at the interface and the shear strength could reach 65MPa.
Key Technologies in the Design of a Vacuum Die Casting Mould for Aluminum Alloy Joints
Authors: Ge Xiao Hong , Huang Hong Wu , Li Hui , Yang Hui Huang
Published: March 2010

Aluminum alloy joints are a key component of a light-weight bus body, hence, they have a complicated structure and high strength requirement. A vacuum die casting mould has been developed and joints have been manufactured using a CAE simulation, a “whole-process-vacuum exhaust” vacuum die casting process and a decreased cross-section design for vacuum-pumping. The joint’s internal porosity has been noticeably reduced and its mechanical properties have been considerably improved in comparison with joints manufactured from die casting.
Mechanical Properties of Single-Walled Carbon Nanotubes under Large Axial Deformation
Authors: Cai Kun
Published: March 2010

The deformation of single-walled carbon nanotubes (SWCNTs) under large axial strain is studied by a geometrical mapping method. The interactions between atoms in carbon nanotubes (CNTs) are described by Tersoff-Brenner potential. Results show the strain energy depends on chirality but hardly on tubes’ radii. For graphitic sheet under large axial deformation, the elastic moduli decrease with the increase of engineering strain under tension. The modulus reaches the peak value as the axial engineering strain reaches -0.08 for armchair pattern and -0.15 for zigzag pattern under compression.
Study on Joint Residual Stress Induced by Laser Beam Welding of High Strength Automobile Thin Sheet
Authors: Yan Qi , Chen Huai Ning , Chen Jing , Xue Xiao Huai
Published: March 2010

Despite the advantages of the high energy density, high welding velocity and low deformation, some detrimental residual stresses were still introduced during the laser beam welding (LBW) process. The aim of this work was to study the magnitude and distribution of the residual stress in the LBW seam of the high strength automobile thin sheet. With the feature of applicable to the measurement of the residual stresses in the narrow area, the indentation strain method (ISM) was employed. By appropriate design of the biaxial strain rosette with the small size, the ISM was successfully used to measure the residual stress in the thin sheet LBW seam. Also, the finite element method (FEM) was used to calculate the residual stress. The comparison of the measured residual stresses through the ISM was made with those of the cutting relaxation method (CRM) as well as the FEM results. The ISM results showed that the highest tensile residual stress located at the seam centerline and exceeded to the 60 percent of the yield strength of the base metal.
Study on the Microstructure of Micro Laser Welded Joint of TiNi Shape Memory Alloy Sheet
Authors: Chen Yu Hua , Ke Li Ming , Liu Ying , Xu Shi Long
Published: March 2010

Butt welding of 0.2mm thick TiNi shape memory alloy sheet was successfully realized by using micro impulse laser whose average power is 80W and the microstructure of welded joint was study in this paper. The results show that, the welded joint of micro laser welding can be divided into four zones according to grain size and microstructure. The microstructure in base metal zone is rolled structure and the grains are coarse and heterogeneous. The microstructures of welded seam center zone are fine equiaxed crystals and the microstructures of both lower surface and upper surface edge zone are columnar crystals. There is almost no obvious coarse grain heat-affected zone at the edge between welded seam and base metal. There is obvious segregation layer in local area of welded seam because the content of Ti and Ni elements is changed and different with base metal during the crystallizing course of welding pool.
Numerical Simulation for the Thermal Fatigue of Flip Chip Solder Joints
Authors: Lin Yong Cheng , Lu Jing Hong , Zhang Jun
Published: March 2010

Fatigue failure of solder joints is a serious reliability concern in area array technologies. A non-linear finite element model was made to study the effects of underfill material and substrate flexibility on solder joint thermal fatigue. Accelerated temperature cycling loading was imposed to evaluate the reliability of solder joints in test flip chip assembly. The results show that the underfill material and substrate flexibility can improve the distribution of stress/strain and reduce the magnitude of stress/strain in the solder joints. Therefore, the reliability of solder joints under thermal cycling condition can be enhanced by applying underfill material and selecting the Flex substrates during temperature cycling.
Research on Solidification Characteristics of Resin in High-Resolution Stereolithography System
Authors: Xu Guang Shen , Ma Xun Ming , Luo Sheng , Qiu Rong Hua
Published: March 2010

To control the building resolution and accuracy of high-resolution Stereolithography (SL) system, a novel building parameter which is the ratio of laser power to laser beam scanning speed has been proposed. Researches were performed to investigate the relationship of cured line width and depth with the ratio of laser power to laser beam scanning speed of the SL system. The experimental results show that cured depth and width increase with the ratio of laser power to scanning speed. Based on the cured line width and depth obtained in the experiment, empirical equations predicting cured line width and depth according to the ratio of laser power to scanning speed in the SL system have been established by using least squares method, the empirical equations provide the foundation for improving building resolution and accuracy of high-resolution SL system with linewidth accurately compensation and layer thickness appropriately setup in the high-resolution SL system.
Development of a Novel Laser-Sintering Machine for Fabrication of Artificial Bone
Authors: Shuai Ci Jun , Peng Shu Ping , Wen Xue Jun
Published: March 2010

To fabricate an artificial bone, the degradation rate of which is adjustable, porosity and pore size is controllable, and internal continuity is good, a device is developed with nano-sized hydroxyapatite as raw material, micron-sized spot of high-power laser as energy, and selective sintering as technology to fabricate three-dimensional porous. Its basic composition, design ideas, features and working principle are introduced. The feeding mechanical system, sintering system, and laser focusing system are described in detail. The motion precision and laser-spot control precision meet with the requirements with testing.
Prediction and Research of Single Point Incremental Forming Limit
Authors: Li Lei , Zhou Wan Lin , Hussain Ghulam
Published: March 2010

Sing point incremental forming (SPIF) limit is much higher than the traditional processes. Currently, there are still no systematic theories and criterions to predict the limit. In this paper, the Oyane ductile fracture criterion is introduced to predict the forming limit of SPIF based on the stress-strain data by the finite element simulations. The predicted fracture initiation sites and the forming limit curve are consistent with the experiment results; further, the forming characteristic, stress state, local temperature are the main reasons of the higher forming limit in SPIF.
Rapid Fabrication of Micro-Gear via Vacuum Casting Technique of Silicone Rubber Mould
Authors: Zhou Jian Zhong , Xiao L. , Huang Shu , Zhu J.H. , Xu Z.M. , Huang J. , Dai Y.C.
Published: March 2010

A silicone rubber mould was designed and fabricated to study the forming performance of micro-gear based on vacuum casting technique. The effects of process parameters, such as mould temperature, resin temperature, vacuum deaerating time and curing temperature etc, on vacuum casting quality of micro-gear were investigated. The results indicated that high precision micro-gear can be made in batches by means of vacuum casting of silicone rubber mould, and the vacuum deaerating time has the most important influence on the physical dimension of micro-components.
Research and Application on Reverse Design of Complicated Petroleum Aiguille
Authors: Sun Wen Lei , Yuan Yi Ping , Zhong Yi Fang , He Li , Guo Jao
Published: March 2010

The petroleum aiguille, whose capabilities directly affect the quality, speed and cost of artesian well, is the primary rock breaker in the petroleum and natural gas industry. This paper has researched the reverse design of imported and high-powered petroleum aiguille, including the numerical reverse design, the revivification of dimension, the finite element analysis of numerical model, the simulation of Numerical Control（NC）machining and so on. Through analyzing and redesigning the complicated parts of petroleum aiguille and numerical making server, the manufacturer could absorb quickly and develop the overseas advanced products, step up the development-level of petroleum exploitation facilities, and reduce the cost of petroleum exploitation.
Evaluation of WEDM Surface Quality
Authors: Geng Lei , Zhong Hua Yan
Published: March 2010

The formation of WEDM surface is a complicated process. There are many factors which make machined surface topography have the characteristics of complex and irregular, and impact using performance of parts. The work investigated microscopic features of the WEDM surface topography based on power spectral density and fractal theory, and proposed power spectral density evaluation method of the WEDM surface. The fractal dimension of the WEDM surface was calculated by structure function method. The physical meaning of the fractal dimension of the WEDM surface was described. The result shows that topography of the WEDM surface exhibits strong fractal characteristics within a certain scale. The processing parameters and pulse power performance will affect the fractal dimension D. The fractal dimension D has a certain relationship with the surface roughness Ra. It is more reasonable to use the fractal dimension D as well as the surface roughness Ra together to evaluate WEDM surface quality.
The Research of Digital Soft Switching Arc-Welding Inverter
Authors: Jia Gui Xi , Zhang Yang , Xiao You Wen , Su Yuan
Published: March 2010

This paper discusses the characteristics of welding power supply, and then gives the design ideas of digital welding power. A full-bridge configuration which cooperates with high frequency transformer and rectifier circuit is used to be main circuit, and IGBT is the primary switch component. The leading leg achieves Zero Voltage Switching, and the lagging leg is Zero Current Switching by the combination of soft switching and inverter technology. We take UC3879 as the core of PWM controlling to carry out soft switching and TMS320LF2407A as the core of all controlling system. The control strategy adopts fuzzy-PID control.
Research of Uniformity and Effect on Crankshaft Barrel Finishing
Authors: Li Wen Hui , Yang Sheng Qiang , Yang Shi Chun , Chen Hong Ling
Published: March 2010

At present, crankshafts are finished mostly by abrasive cloth and manual steel brush, which is not ideal on finishing quality, efficiency, cost and cleanness degree. So a new process, horizontal spindle barrel finishing, is developed. Based on its finishing mechanism, factors and effect affecting finishing uniformity are analyzed by theory and experiment, finishing effect is defined, which provides basis for parameters selection of crankshafts barrel finishing.
Finishing Effect and Uniformity on Gas-Particle Two-Phase Swirling Flows Finishing for Hole Surface
Authors: Yang Sheng Qiang , Li Wen Hui , Yang Shi Chun
Published: March 2010

For precise hole surfaces, the burr severely affects products’ performance and service life. Considering specific conditions of hole surface finishing, a new method of gas-particle two-phase swirling flows finishing is brought up. By experimental analysis, finishing effect and axial uniformity are defined, which provides credible basis for thorough research, equipment design and industrial application.
Simulation and Experiment Research on the Swirling Airflow Compounded with Magnetic-Field Finishing
Authors: Li Xiu Hong , Yang Sheng Qiang , Li Wen Hui , Yang Shi Chun
Published: March 2010

A new finishing technology of the swirling airflow compounded with magnetic-field is advanced. Magnetic field simulation and flow field simulation are done through ANSYS and computational fluid dynamics (CFD) software. Unthreaded hole is experimented on the basis of simulation. Research indicates that the swirling airflow compounded with magnetic-field finishing is feasible and adding magnetic field may avoid the ununiformity of the swirling airflow finishing as well as increase finishing effect. It provides credible theoretic basis for technology improvement.
Effects of Polymer Particles Suspending in Dielectric Fluid on Surface Roughness of EDM
Authors: Tsai Yao Yang , Chang Chih Kang
Published: March 2010

Suspending powder in dielectric fluid of EDM (electrical discharge machining) has been developed to improve the quality of machined surface recently. The used powders are usually Al, Cu, Cr and so on metal powder because conductive particle can increase the spark gap and improve surface roughness of machined surface. Semi-conductive powder, Si is also utilized for the sake of increasing machining speed. This paper presents a new tryout to suspend polymer particles in the dielectric fluid of EDM. Experimental results show that the EDM process with suspending polymer particles still can be carried out but its surface roughness is not so good in conventional EDM oil. However the conventional EDM oil was taken the replace of silicone oil, suspending polyaniline (PANI-emer) of high molecular weight (Mw~65000) has finer improvement even better than using Si powder. Its surface roughness achieves less than Ra 0.2μm at low concentration and will be decreased gradually with increasing the concentration of PANI-emer (Mw~65000). The surface roughness is Ra 0.14μm when the powders concentration is 10g/l. Even for different type of polyaniline shows different machining characteristics. The surfaces roughness becomes worse when the concentration of low molecular weight PANI-emer (Mw~20000) is higher. An electric-conductive PANI-salt powder has a rapid decrease of surface roughness with increasing its concentration than other materials.
Temperature Field Model in Plasma Arc Forming of Laminated Clad Metal Sheets Containing Defects
Authors: Xu Wen Ji , Jiang Ji Shang , Wang Xu Yue , Song Wen Qing
Published: March 2010

A FEM model, based on the structural characteristics of laminated clad metal sheets (LCMS) containing defects, was developed to study the variations of temperature field in the flexible forming using plasma arc. The typical LCMS Q235A/1Cr18Ni9Ti was selected as the sample, and the effects of different defects in the bonding interface on the temperature field were analyzed. The results show that the peak value of temperature containing defect is 107 oC higher than that without defect under the same processing parameters. The peak values of temperature and temperature difference increase with the increasing of defect size, but decrease when the location of defect is far away from the heating surface of LCMS. Compared with spherical defect, cubic defect has more power to impede heat conduction along the thickness direction of LCMS.
Influence of Substrates and Annealing on the Al-Cu-Fe Nano Films
Authors: Zhou Xi Ying , Liu Yan Hui , Xu Zhou
Published: March 2010

The Al-Cu-Fe nano films were successfully deposited by magnetron co-sputtering with the Al, Cu and Fe independent targets. The surface morphologies, microstructure and composition of the films were analyzed by SEM and XRD. The bonding strength, friction coefficient, nanohardness and elastic modulus of the films before and after annealing at 600 °C were determined by nano-indentation and nano-scratch. The results show that the bonding strength of the film with stainless steel substrate is the highest among these substrates. The friction coefficient of the film for pure Cu substrate is 0.17. New fine β phases with approximate quasicrystalline structure are formed in Al-Cu-Fe films after annealing at 600 °C. Furthermore, the hardness and elastic modulus of the films are obviously increased respectively.
Analytical Model of Unconstrained Nonlocal Higher-Order Nano-Plates for Bending Analysis
Authors: Niu Jun Chuan , Lim C.W. , Leung A.Y.T.
Published: March 2010

This paper presents a higher-order nonlocal plate model and its formulation for bending analysis of nanoplates via variational principle and virtual work approach based on Leung’s unconstrained higher-order plate theory and Eringen’s nonlocal continuum theory. Bending of the simply supported rectangular higher-order nano-plate is investigated in comparison with the lower-order plate models. The numerical examples show that nonlocal nanoscale parameters increase the deflections of the plate as the rotary inertia and the transverse shear deformation do.
Study on the Disturbance of Rotor-Bearing System Caused by Circumferential Loading Torque
Authors: Liang Qun Long , Yang Zhao Jian , Sun Huer , Pang Xin Yu
Published: March 2010

In the rotor-bearing system fault diagnosis, the data mainly come from bearing vibration monitoring. When investigators studied the coupled flexural and torsional vibration, they only took into account the bending vibration, the torsional vibration and swinging vibration. But it’s plagiohedral for them to only monitor bearing vibration signals. This paper presents a circumferential loading system which the torque is imposed on the rotor - bearing system by couplings. On the system we studied the disturbance of rotor-bearing system caused by circumferential loading torque, and observed that the bearing vibration response was inconsistent with the bearing load changes. This provided a new basis for the rotor-bearing system fault diagnosis.
Study on the Measuring System of the Planar Parallel Micro-Motion Worktable’s Location and Orientation
Authors: Huang Zhi Gang , Liu Pin Gang , Cheng Xian Fu
Published: March 2010

Due to the smallness of micro-motion parallel manipulators’ work spaces, the installation of sensors for the measurement of location and orientation is very difficult. To overcome this disadvantage, a measuring method is deliverd in this paper based on the binocular vision principle. Utilizing corresponding relationship between the image coordinate and the world coordinate, some essential information of characteristic point is extracted from two corresponding images. A model for detecting the location and the orientation of 3-DOF micro-motion worktable is established based on characteristic points’ matching consideration. The method of solving the location and orientation problem has such merits as small information content, small computation, high processing speed, less time consuming, and so on. So, it is fit for dynamic measurement. The measure system is composed of two high-resolution vidicons, high-speed image acquisition card, industrial PC and the related software. The correlative error is analyzed in the measuring process . Some countermeasures are proposed to minimize the adverse influence of error at the same time. The technologies used are comparatively mature and the prices of equipment used are moderate in the whole measuring solution. All of these factors help to realize and popularize the solution in the industry environment conveniently.
Research on Decision-Making Model for Mechanical Motion Scheme
Authors: Peng An Hua
Published: March 2010

Mechanical motion appraisal contains many-sided contents such as technical performance and economic one, which may be have much uncertain knowledge or information. Factors in different levels or in the same ones get in touch mutually,influence upon each other, composing an ample grey system by combined action. Contact and restrict in various properties are effectively synthesized through levels of grey relational analysis model, resulting in dealing with uncertain knowledge or information in rational method, an objective reflection of the true nature, limiting subjective factors to the minimum. The method is successfully applied to the choice of paper-cut mechanism, finally selecting the niutou-plane mechanism as the best one from the three to be selected.
Product Development Oriented Knowledge Management
Authors: Hao Jia , Yan Yan , Lin Jian Jun , Hu Li Chen , Zhang Mei
Published: March 2010

To promote the efficiency of product development, the accumulated knowledge resources is studied in this article. At the beginning, to manage all the knowledge resources properly, the classification of accumulated knowledge resources is discussed; then the model used to manage different kinds of knowledge is explained respectively; at last the knowledge management prototype system is introduced.
Investigation on Low Cycle Fatigue Life of SC Notched Specimens
Authors: Zhao Ping , He Qing Hua , Li Wei
Published: March 2010

A low cycle fatigue life (LCF) prediction model for nickel-based single crystal (SC) is presented based on the LCF experiments of notched specimens. Fatigue notch factor is adopted to reflect the influence of notch shape on LCF. Orientation function is adopted to modify total strain range and eliminate the influence of orientation on LCF. Cycle stress ratio is adopted to reflect the influence of mean stress and cycle character on LCF. The predicted results shows that all the data are in the factor of 2.1 scatter band, which means that the model proposed in this work is reasonable.
Analysis of the Hydrodynamic Effect in Laser-Textured Mechanical Seal Faces
Authors: Yu Xin Qi , Peng Pei Ying , Gao Hui Qin , Zhang He Fang
Published: March 2010

A calculation model is developed for mechanical seals with a laser-textured micro-pore face. The dimensionless hydrodynamic pressure distribution on the seal face at various operating conditions and micro-pore geometry parameters is obtained from a solution of the Reynolds equation by the finite difference method. An optimum micro-pore geometry parameter is found and consistent with experimental results. Results of parametric study demonstrate that the substantial hydrodynamic effect can be produced on the seal face with micro-pores.
Effect of Grinding Wheel Diameter Change on Geometrical Parameters of Ball-Nose End Mill
Authors: He Lin , Sun L.M. , Zhao Xian Feng , Wang Jun
Published: March 2010

The grinding simulation system of ball-nose end mill rake face is developed based on the four axis linkage mathematical model using Solidworks and Visual Basic for Applications (VBA). Effects of grinding wheel diameter change due to wear on geometrical parameters of ball-nose end mill, such as ball-nose rake angle, column rake angle and edge strip width are investigated.
The Effect of Precipitates on Anisotropy of Al-Li Alloys 2090 and 2090+Ce
Authors: Zhao Zhi Long , Chen Zheng , Liu Lin
Published: March 2010

The critical resolved stresses (CRSS) of two kinds of Al-Li alloys 2090 and 2090+Ce in which contained trace addition of cerium are examined. The three heat treatment conditions (solution, peak aging and reversion after peak aging) are used in order to identify the influence of precipitates to CRSS. The experimental results show that the strengthening contribution of T1 Phase is greatly different at various orientation with respect to rolling direction, and the precipitation of T1 phase can weaken the anisotropy of mechanical properties. The T1 phase precipitated in subgain boundaries in peak aged and reverted specimens produce a stronger tendency of delaminating along grain boundary, which is a direct reason for the decrease of anisotropic yield strength.
Analysis of Fracture Failure of Diaphragm of Non-Contact Electronic Horn
Authors: Jiang Shu Yong , Zhang Yan Qiu , Sun Jin Feng , Zhao Li Hong
Published: March 2010

The fracture of the diaphragm is the main failure pattern of the non-contact electronic horn. The spring steel strip 50CrVA which is cold rolled was applied to manufacture the diaphragm of the non-contact electronic horn by means of sheet metal forming. The combination of the experiments with finite element method (FEM) was used to reveal mechanism of fracture failure of the diaphragm. The displacement field, the effective strain field and the effective stress field at the maximum amplitude value are obtained by simulating the genuine vibrating state of the diaphragm with the help of ANSYS finite element code. The maximum stress zone of the stress field of the diaphragm is responsible for the fracture zone of the diaphragm. The fatigue test of the diaphragm and microscopy of the fractured diaphragm indicates that the fracture pattern of the diaphragm agree well with finite element simulation results. Eventually, the measures to prevent the fracture of the diaphragm were taken in order to increase the endurance of the diaphragm.
A Plastic Zone Equation Based on Mean Yield Criterion
Authors: Deng Wei , Zhao De Wen , Qin Xiao Mei , Gao Xiu Hua , Qiu Chun Lin , Du Lin Xiu
Published: March 2010

Based on mean yield criterion, an analytical solution for the mode I crack tip plastic zone (CTPZ) under small scale yielding was derived. The results reveal that the size of CTPZ determined by MY criterion is between those by Mises’ yield criterion the smallest, and by Tresca’s criterion the largest; while the zone is almost coincide with that by Mises’ one. The size of CTPZ is related to the ratio of fracture toughness to yield strength; with increasing of the ratio, the size of the zone increases, meaning the better of fracture toughness.
Effect of Rare Earth Y Addition on the Properties and Precipitation Morphology of Aged Cu-Cr-Ti Lead Frame Alloy
Authors: Wang Xian Hui , Liang Yan , Zou Jun Tao , Liang Shu Hua , Fan Zhi Kang
Published: March 2010

The influence of rare earth Y addition and ageing treatment on the properties and precipitation morphology of Cu-Cr-Ti alloy was investigated. The results show that 0.1wt%Y addition increases the hardness, and decreases the electrical conductivity slightly. However, both the hardness and electrical conductivity decrease with an excessive Y addition. After ageing at 550°C for 2h, Cu-0.3Cr-0.2Ti-0.1Y alloy has a good combination of the hardness and electrical conductivity, which has the hardness of 134HV and the electrical conductivity of 73.9%IACS. After ageing treatment, most Cr rich phases precipitate in the form of sphere shape while a small amount of Cr rich phases exist in the form of acicular, and Y rich phases precipitate in the form of flake along the grain boundary.
The Elastic-Viscoplastic Field Near Mode II Dynamic Propagating Crack-Tip of Interface in Double Dissimilar Materials
Authors: Liang Wen Yan , Wang Zhen Qing , Lv Hong Qing
Published: March 2010

The existence of viscosity effect at the interface of double dissimilar materials has an important impact to the distribution of interface crack-tip field and the properties variety of the interface itself. The singular is considered in crack-tip, and the elastic-viscoplastic governing equations of double dissimilar materials at quasi-static propagating interface crack-tip field are established. The displacement potential function and boundary condition of interface crack-tip are introduced, and the numerical analysis of rigid-elastic viscoplastic interface for mode II are worked out. The stress-strain fields are obtained at the crack-tip and the variations of solutions are discussed according to each parameter. The numerical results show that the viscosity effect is a main factor of interface propagating crack-tip field, and the interface crack-tip is a viscoplastic field that is governed by viscosity coefficient、Mach number and singular factor.
A Comparison of Macroscopic Fracture Surface and Crack Growth Rate of Ti-6Al-4V
Authors: Farhangdoost Khalil , Rahnama S.
Published: March 2010

A comparison between crack growth rate (da/dN) vs. effective stress intensity range factor (ΔKeff) curve behavior and microscopic and macroscopic fracture surface of commercial Ti-6Al-4V alloy are presented. Three different regimes are correlated with characteristics measured on the fracture surfaces. Three regions can be observed in which part I is rough and darker than others parts known as pre-transition, part II is smooth and light known as transition region and part III is a little darker than part II known as post-transition region. In the present investigation the correlation of fatigue crack growth rate for Ti-6Al-4V and microstructure of fracture surface has been presented.
Study on Strain Solitary Waves in the Nonlinear Elastic Circular Rod
Authors: Liu Zhi Fang , Zhang Shan Yuan , Lu Guo Yun
Published: March 2010

Taking into account the nonlinear constitutive relationship and transverse Poisson effects, the propagation characteristic of nonlinear wave for one-dimension elastic thin rod is studied. With the help of Mathematic, two traveling wave solutions for this nonlinear wave equation are obtained by sine-cosine function method, which include the shock wave solution and the solitary wave solution. The necessary condition of these solutions is given also.
Analysis of Tension and Deformation Curvature in Strip Tension Levelling
Authors: Zhou Cun Long , Jiang Zheng Yi , Wang Guo Dong , Xie Dong Gang , Zhang Yong An
Published: March 2010

In this paper, a new method considering the combination of tension and deformation curvature which results in less deformation energy under a certain elongation is presented at the first time. The calculation results show that when the elongation is less than 1 %, the tension which is about 1/6 yield stress will consume less energy. If the tension decreases from 1/4 to 1/8 yield stress, the deformation energy of strip with yield stress of greater than 450 MPa decreases significantly. This study can help determine the processes parameters of strip tension levelling effectively.
The Effect of Fillet Geometry on Stress in Weld-Bonded Joints
Authors: Yan Jia Ling , You Min , Zheng Xiao Ling , Zhu Ding Feng , Zhao Mei Rong
Published: March 2010

The influence of fillets with different geometry shape on the stress distribution in aluminum alloy weld-bonded single lap joint was investigated using elasto-plastic finite element method (FEM). The results show that it is advantageous of reducing stress concentration in adhesive layer near the ends of the lap zone in single lap weld-bonded aluminum joints and part of the stress transferring from adhesive layer to the nugget when the joints with a couple of right triangle fillets over other shapes. The load-bearing capacity of the whole weld-bonded joints may be improved. The full-triangular fillet is recommended that it be more advantageous of decreasing the stress peak value and making the stress distribution in overlap zone more uniform.
Test Methods for Mechanical Properties of Structural Adhesives
Authors: Deng Jun
Published: March 2010

One of the greatest drawbacks to predicting the behaviour of bonded joints has been the lack of reliable data on the mechanical properties of adhesives. In this study, methods for determining mechanical properties of structural adhesive were discussed. The Young’s modulus, Poisson’s ratio and tensile strength of the adhesive were tested by dogbone specimens (bulk form) and butt joint specimens (in situ form). The shear modulus and shear strength were test by V-notched specimens (bulk form) and thick adherend lap-shear (TALS) joint specimens (in situ form). The test results show that the elastic modulus provided by the manufacturer is too low, the dogbone specimen is better than the butt joint specimen to test the tensile strength and elastic modulus and the TALS joint specimen is better than the V-notched specimen to test the shear strength.