bluuebunny/crossref_metadata_2025 huggingface dataset:
Linear Polarization Method Research of Quantitative Detection Based on Concrete Reinforcement Corrosion
Authors: Hao Bao Hong , Dou Yan Tao , Zeng Ding , Zeng Qi Hui
Published: February 2014

In order to achieve internal reinforcement of concrete bridges quantitative nondestructive testing, this paper has adopted linear polarization method to test reinforcement passivation in the pore solution of simulated concrete and corrosion current density value in the corrosion process under different external environments and has built calculation model for amount of reinforcement corrosion based on detection signal. That is to say a new idea, which makes the evaluation results more effective, has been put forward to efficiently correspond with reinforcement corrosion ratio with potential signal, and the quantification evaluation for damage of reinforced concrete can be carried directly. It has modified theoretical model and analyzed the error through weightlessness tests. The research result shows that the calculation model after modified can significantly improve the detection accuracy for the actual rate of reinforcement corrosion.
CLC: TU528.33 Document code:
Nondestructive Testing of Composite Bonding Structure Using Guided Wave
Authors: Li Jian , Ai Chun An , Cai Xiao Feng , Han Zhao Lin
Published: February 2014

This paper introduced a nondestructive testing (NDT) method of using guided wave to detect debonding in composite bonding structure, which is based on the model of guided wave energy leakage, and the simulation analysis shown that the diameter of debonding could be quantified by E-x curve. The experiments were carried out on a composite bonding structure, and the results provide that the model established is correct, and that the method of quantifying debonding by E-x curve is effective.
Calculation of Kill Probability for Kinetic Energy Rod against TBM Warhead
Authors: Wang Ying Chun , Wang Jie , Han Bei Bei
Published: February 2014

Kinetic energy rod (KE-rod) warheads are one of the most efficient types against tactical ballistic missile (TBM) that exist today, so the kill probability of KE-rod is extremely important. The paper firstly describes the necessity of KE-rod warhead, and then analyzes the separation velocity of KE-rod, the effective kill radius, static dispersal, dynamic kill zone, and the computational model of mathematical expectation for the hit rod number, and then presents the calculation method of kill probability for KE-rod. Finally, the kill probability of the KE-rod is simulated, the results show that the probability decreases rapidly with the increase of distance between the KE-rod warhead and the target, when the distance between the interceptor and target is less than 5 meters, the kill probability is up to 50%.
Design for Disassembly Based on Substance-Field Analysis
Authors: Mu Rui , Zhao Na
Published: February 2014

As a part of sustainable product design, design for disassembly is critical for maintaining competitiveness of manufacturers. The conflicts between disassembly capability and functionality and reliability need to be addressed innovatively and effectively. This article proposes a method to combine functional analysis and substance-field(S-F) analysis adapted from TRIZ to solve such complex conflicts. First, problems of current design that hinder the disassembly capability of products are identified. Second, functional and cause analysis are carried out for the technical system to transform conceptual description into practical description for components in the technical system. Last, a solution for improving the disassembly capability of products is proposed based on the structural model obtained from S-F analysis. This method is used to improve the disassembly capability of couplings in automotive transmissions, and proven to be effective and feasible in discovering an innovative solution.
Optimization of Incremental Sheet Metal Forming Parameters by Design of Experiments
Authors: Majagi Sunil D. , Chandramohan G.
Published: February 2014

The purpose of the paper is to investigate the dependency of various parameters on metal forming process using mathematical models. The incremental sheet metal forming process was studied using Box–Behnken design of experiments along with response from surface methodology analysis. In the study process factors namely feed rate, speed and coolant were analysed to understand the effect on the surface roughness, percentage (%) of thickness reduction, grain size and hardness of the Aluminium (Al) sheet metal, were examined after forming. The surface model analysis predicts that all four responses of the incremental forms show very strong correlation with the experimental results. The optimized process of incremental forming that runs on maintained levels of predicted factors, yield responses very close to that predicted from the model.
Research for Calculation Model of Allotypic Pumping Unit Load
Authors: Cen Xue Qi , Wu Xiao Dong , Wei Shu , Zhang Xi Shun , Zhang Jia Ming , Tang Jing Fei , Li Shu Dong
Published: February 2014

A research has been developed for calculation models of allotypic pumping units load against a series of problems, which are ubiquitous in the oil field, such as unreasonable selection of the pumping unit type, low capacity factor of the pumping unit load, lacking of computing method of allotypic pumping unit load, etc. In the research, a calcaulation model of polished rod motion parameters has been firstly established according to the architectural feature of offset pumping units, dual horsehead pump units and tower pumping units. Then the load calculation model of allotypic pumping units were built based on the superposition method of each rod string stress. And after validating the load models in the oil field, the results have been indicated that the models have been in good agreement with the polished rod load. Therefore, the load calculation model of allotypic pumping units in this paper will be of some guidance significance to the selection of the pumping unit type and the stress check of the rod string in the oil field.
Dynamic Analysis on a Cable-Driven Interventional Active Catheter Using Kane's Method Combined with Screw Theory
Authors: Zhao Da Xu , Chen Bai , Shou Guo Zhong , Gu Yu Qi
Published: February 2014

In view of the existing problems of traditional interventional catheters, particularly poor activity, operation difficulty and mass blind area, a novel interventional catheter with a cable-driven active head-end is proposed, and a prototype was built to verify the performance. This paper deals with the kinematics and dynamics of the cable-driven prototype, a dynamic model based on Kanes method combined with screw theory was presented in this paper. According the mathematical model and the prototypes structure, the analysis of kinematics and dynamics of active head-end-end is done in the environment of Mathematica. The needed driving forces of every joint when the system moving along planned trajectory are calculated. The results can provide a basis for the structure design and motion control of the interventional active catheter.
Design and Optimization of Urban Signal Fuzzy Controller Based on IQPSO
Authors: Li Wei , Bi Xin , Cao Yun Xia , Du Jin Song
Published: February 2014

In order to overcome the shortcomings of traffic signal fixed-time control method, a fuzzy control algorithm for urban traffic signal is proposed. The signal phase switching order is adjustable. The improved quantum particle swarm optimization(QPSO) is also introduced to optimize fuzzy control rules of traffic signal controller. Take four-phase traffic signal commonly used in current practice for example. Compared with traffic signal fixed-time control and single fuzzy control method, the control method put forward in this paper can reduce the vehicles’ average delay time in junction. The simulation results show that the proposed algorithm is proved to be an effective and practicable method for urban traffic self-adaptive control.
Error Modeling and Simulation of Serial-Parallel Mechanism Based on Screw Theory
Authors: Hu Sheng Hai , Liu Xiu Lian , Sun Jun Chao , Xie Ting Ting , Qi Song
Published: February 2014

Focus on the problems of calculation complexity and abstractness in the traditional analysis methods of serial-parallel mechanism, the complete kinematic product of exponentials formula of serial-parallel mechanism was established in the paper based on the screw representation of spatial rigid motion. The errors of 4 D-H parameters were equivalent to error screw and the practical screw coordinate containing error screw of every joint axis was established. After the practical kinematic product of exponentials formula of serial-parallel mechanism being derived, the pose error model of tool coordinate system was established. According to the above screw method, numerical calculation of cutting machine about kinematic and error analysis was performed with MATLAB and the calculation results were compared with the simulation results of ADAMS. The comparison results show that relative error of the two groups of calculation results is within the 0.001 orders of magnitude and the correctness of screw methods application in the analysis of serial-parallel mechanism.
Structural Design and Performance Study of Parallel Metamorphic Mechanism Based on Screw System Theory
Authors: Hu Sheng Hai , Wang Hong Guang , Xie Ting Ting , Sun Tian Shi
Published: February 2014

A new type of metamorphic kinematic pair is designed according to the traditional kinematic pair, and further a novel parallel metamorphic cutting mechanism is designed. Based on screw system theory the constraints of structure branched chain on the end of the moving platform are analyzed before and after transformation, and then the degrees of freedom of the novel parallel metamorphic cutting mechanism is calculated, and the exact axis that the mechanism rotates across can also be obtained.
Missile Trajectory Simulation in Vertical Plane
Authors: Li Yang Hua , Mo Bo , Zhao Jie
Published: February 2014

In this paper, Newton's laws of motion and momentum theorem are the theoretical basis. The equations of motion in the vertical plane are the calculation basis. In order to get the ballistic and numerical solution of motion parameters of the missile, the Runge-Kutta method and matlab are used to solve the missile Trajectory. Firstly, this paper builds the trajectory model of missile in vertical plane. Secondly, this paper chooses missile control method. Thirdly, the Runge-Kutta method and matlab are used to verify the correctness. And to further analyze the law of motion parameters changed with time.
Preparation Process of Long Fiber Reinforced Impact Polypropylene Copolymer Composites
Authors: Li Li Ping , Tan Hong Sheng , Liu Yu Fei , Tan Zhe Xing , Liu Xue Jing
Published: February 2014

Composites of continuous glass fiber reinforced impact polypropylene copolymer (IPC) were prepared by using a cross-head impregnation mold by a self-designed die fixed on a single screw extruder, and were chopped into Long fiber/IPC pellets approximately 12 mm in length. The effect of preheat temperature and pulling speed on the mechanical properties of the composites were studied and micrographs of fracture surface of impact specimens for the composites were investigated by scanning electron microscope (SEM). Mechanical properties of the composites were best at 200 °C of the preheated temperature, for the better interfacial adhesion between glass and matrix resin, and that proved by the SEM. Meanwhile, mechanical properties of the composites decreasing with the increasing of pulling speed, for the impregnation effect degraded.
Study on Development and Testing Mechanism of a New Multifunction Agricultural V-Belt Fatigue Testing Machine
Authors: Zhang Wei Feng , Zhang Fu Xia , Lv Ying Jie , Bao Feng Feng
Published: February 2014

Agricultural V-belt fatigue testing machine is a kind of testing equipment developed based on the service condition of the agricultural V-belt, for the detection of fatigue performance of agricultural V-belt. The paper firstly analyzes the transmission principle, loading mode and testing parameters of the agricultural V-belt fatigue testing machine, and then introduces its basic principle, detection parameters and the main structural features, based on which the fatigue performance of the agricultural V-belt is tested and perfectly checked by the testing result. The study is to improve the testing equipment and testing methods for testing the fatigue performance of our national agricultural V-belt, to enhance the overall testing ability in China's agricultural machinery industry and to guide the production and use of agricultural V-belts.
Digital Structural Design and Research of Optical Microscope
Authors: Shan Yun Xiao
Published: February 2014

The article has been discussed that it adopts step-by-step electric motor to come to auto-control through reforming the carrier and the objective lens£¬the design of the image acquisition device£¬adjustment mechanism of the Imaging lens is designed by adding the step-by-step electric motor pretending to realize high focusing accuracy and brings forward innovation design about the auto alignment device in micro field of view. This project aims to improve the ordinary microscopes and develop the digital acquisition system of the microscopic image which can accurately acquire the image information. It also can be wildly used in areas such as biomedicine, materials science, research experiments and so on.
The Exploitation of Environmentally Friendly Materials for Humane Care in Children Postoperative Recovery
Authors: Shao Xu Hui
Published: February 2014

According to the principle of internet integration systems, the accurate interactive TV equipment is designed. On the basis of establishing the model of animation scene to be processed, the 3D video equipment is assembled in a signal and image processing by using the application software signal and image processing systems provided by game systems. The virtual image of the components of accurate video equipment is implemented either from top to bottom or reversely, providing a basis for humane care in children postoperative recovery of this equipment.
Design of Rate Gyro Stabilized Platform Control System
Authors: Yan Xin Ying , Mo Bo , Qi He , Zhu Hai Wen
Published: February 2014

Seeker plays an extremely important role in precision-guided weapons, among which the high tracking precision ability of servo system is one of the key technology. This paper studies the three-loop control system applied in the rate gyro stabilized platform of an infrared seeker and researches the stability, rapidity and accuracy of speed loop ,current loop and position loop. Finally, according to the engineering project, we can verify the validity and applicability of this triple loop system.
Design of Pneumatic and Control System for Quartz Crystal Tin Dipping Machine
Authors: Chang Hong Jie , Yang Yi Ping , Yue Yan Fang , Yang Guang
Published: February 2014

This paper introduces the craft process and work principle of the quartz crystal tin dipping machine, and pays attention to elaborate the design content of pneumatic system and control system. The equipments control cores are Siemens small size PLC and industrial touch screen, and selects air cylinder and micro motor as the main executive components, which can guarantee the facilities reliability and flexibility, have strong anti-interference capability. Through long-term spot application, it indicates this tin dipping machine has stable operation, low failure rate and flexible and convenient operation.
Mechanical Disassembly of End-of-Life Products
Authors: Tourassis Vassilios D.
Published: February 2014

With growing interest in the recovery of materials and subassemblies from consumer products at the end of their useful life, there is a need to develop decision-making methodologies that determine how to maximize the environmental benefits of end-of-life processing while minimizing recovery costs. Disassembling products is the most common mechanical procedure of current end-of-life treatment methods. Consequently, quantitative design evaluation from the disassembly perspective has received special attention in the research literature. Unfortunately the design of disassembly lines cannot be achieved by simply reversing the order of the mechanical assembly of the products involved. The aim of this paper is to demonstrate the similarities and differences of the assembly and disassembly processes through a practical real-world example.
The Resource Conflict Resolution Problem for Virtual Cellular Manufacturing Inter-Cell Scheduling under the Conditions of Resource Sharing
Authors: Han Wen Min , Liu Jing , Mei Liang
Published: February 2014

This paper studies the resource conflict resolution problem for virtual cellular manufacturing inter-cell scheduling. The existing literatures on resource conflict of inter-cell scheduling don't take account into delay within building a model.They try to resolve conflict according to coordination strategy, but it is always accompanied by delay. In view of this deficiency and new characteristics of virtual cellular inter-cell scheduling problem, we consider the tardiness of all products. A hybrid multi-objective particle swarm optimization algorithm is proposed, and considers task priority of shared resource. A new decoding method which simulates market mechanism solves resource conflict problem. The feasible task scheduling shortens total flow time and tardiness, improves the utilization of shared resource. Finally, an example is used to verify its feasibility and validity.
Influencing Factors and Evaluation Standards of Vibration on Human Comfort
Authors: Niu Fu , Su Chen , Ren Xu Dong , Meng Guang , Rao Zhu Shi
Published: February 2014

In this paper, influencing factors and evaluation standards of vibration on human comfort were summarized. The mainly influencing factors were analyzed including vibration acceleration, frequency, exposure time and other factors. The evaluation standards of human comfort were analyzed contrastively. The conclusion was that countries around the world have established unified body vibration comfort evaluation methods and evaluation standards on the basis of ISO series standards. The new methods and standards were also needed for special vibration and shock environment.
The Study for Non-Destructive Quantification Method of Reinforcement Corrosion Degree Based on Electrochemical Detection and Finite Analysis Technology
Authors: Zeng Ding , Hao Bao Hong , Zeng Qi Hui
Published: February 2014

Corrosion of reinforcement is one of the most important factors in causing the damage to reinforced concrete structure and the inestimable economic loss and major security risk to a large number buildings with reinforced concrete structure. In order to overcome the disadvantage of previous service reinforcement which can only be carried out by sizing detection not quantification, this paper puts forward to a new method to evaluate non-destructive quantification of corrosion degree of reinforcement based on the combination of electrochemical detection and finite element analysis, thus the effective corresponding can be produced among reinforcement corrosion rate, potential signal and reinforced concrete structural distortion. The relation among corrosion current density and potential characteristic parameters as well as corrosion ratio has been established. Through the finite element analysis technique and the combination with the case analysis, the relation model between the strain rate of concrete beams and detection signal has been built; the forecasted empirical formula for change of strain value of tested reinforcement has been given And by means of verifying the reliability of model with data of previous experiments, the quantitative calculation of reinforcement corrosion degree has been realized, which lays the technical foundation for the research and development of non-destructive detection equipment of corrosion of reinforcement.
Approximate Evaluation of Exact Solutions of Measurements Inverse Problems
Authors: Menshikov Yuri
Published: February 2014

The inverse problems of measurement are investigated in this paper. The main hypothesis was suggested for evaluation of exact solutions of such problems. For obtaining the steady evaluations of exact solutions of measurement's inverse problem the regularization method was used.
Two practical inverse problems have been considered as examples: Krylov's inverse problem, identification of moment of technological resistance on rolling mill.
Research on Lower-Order Body Matrix Method and the Configuration Transformation of Planar Metamorphic Mechanism
Authors: Hu Sheng Hai , Zhang Man Hui , Qi Song , Xie Ting Ting
Published: February 2014

The lower-order body matrix method is proposed as to topological configuration issue of planar metamorphic mechanism. Through combining lower-order operator and type code of kinematic pair, the lower-order body matrix is built to describe the information of adjacent body and kinematic pair. In the research on configuration transformation of planar metamorphic mechanism, step-description method is put forward which adapts to the analysis of various planar metamorphic ways. Step mathematical equation is established based on the generalized operational rule of lower-order body matrix. Application example shows that the lower-order matrix built with lower-order body matrix method is simpler and more informative, which has many advantages over the adjacency matrix and the correlation matrix that cannot be combined with the kinematics and dynamics equations, and solve the issue that the low-order sequences can only describe the open chain metamorphic mechanism. Step-description method can describe various planar metamorphic configuration transformation process comprehensively, which the EU matrix method cannot complete, providing a new method on the research of planar metamorphic mechanism.
A Case Study on the Air Flow Characteristics of the Hirobo-FALCON 505 Controllable Helicopter's Main Rotor Blade
Authors: Awal Ziad Bin Abdul , bin Ammoo Mohd Shariff
Published: February 2014

The aerodynamics of the helicopter rotor is one of the most elating and exigent tribulations faced by the aerodynamicists today. Study through flow visualization process plays a key role in understanding the airflow distinctiveness and vortex interaction of the helicopter main rotor blade. Inspecting and scrutinizing the effects of wake vortices during operation is a great challenge and imperative in designing effective rotor system. This study aimed to visualize the main rotor airflow pattern of the Hirobo-FALCON 505 controllable subscale helicopter and seek for the vortex flow at the blade tip. The experimental qualitative data is correlated with quantitative data to perform scrupulous study on the airflow behavior and characteristics along with its distinctiveness spawned by the main rotor blade. Simulation using design software is performed in analogous stipulations to endow with comparability between the flow visualization results. Throughout the blade span several dissimilar flow patterns have been identified. The main rotor hub has turbulent flow at its center due to low energy of air amassed in this region whereas in the middle portion of the rotor blade, the air encompasses high kinetic energy with a clear straight streamline pattern.
Research on Horizontal Well Inhibiting Water Coning and Tapping the Potential of Remaining Oil
Authors: Wu Xiao Dong , Wang Yi Ning , Wang Rui He , Zhang Han Han , Qi Bei Lin , Zhu Ming
Published: February 2014

The effects of well type, water extraction time and water extraction quantity on the control of bottom water coning are studied by analytical method. The results suggest that a reservoir with low vertical permeability and interlayer above the water oil contact would have good effect of water extraction and cone control. The effect of water extraction with horizontal well is better than vertical well; the earlier the water extraction is applied, the better the effect of water control is obtained; the larger the quantity of water extraction is, the more obvious is the water control effect, and water extraction time and water extraction quantity has optimal value. In addition, water extraction and cone control is not effective to all bottom water reservoirs that are developed with horizontal well. If the vertical permeability of reservoir is high and have not effective block off of interlining or interlayer above the water oil contact or the water body is giant, the water cut of horizontal well will go up rapidly and the effect of water extraction will be difficult to achieve.
Stress Analysis and Applications of Sucker Rod in Deviated Wells
Authors: Zhang Jia Ming , Wu Xiao Dong , Wang Rui He , Wang Bo , Wang Yi Ning
Published: February 2014

The sucker rod of artificial lift system in a deviated well is very complicated. This paper applies structural mechanics to analyze the distributed characteristics of stress along the sucker rod in a deviated well and builds a reliable model for stress calculation. Moreover, the model designs the sucker rod without neglecting the effects of the reaction forces and bending forces under the condition of 3D structure. Particularly, as for deviated wells with high kickoff point and long inclination paragraph, the model shows better calculation accuracy and reflects the actual local stresses.
The Numerical Simulation and Performance Analysis of the Vortex Pump for Solid-Liquid Two Phase Medium
Authors: Song Peng Yun , Wang Hong Li , He Peng Cheng
Published: February 2014

The numerical simulation of a 3-D model of the internal flow field for a Vortex slurry pump has been analyzed in this paper. The impact of different solids volume fraction on the distribution of solid particle was analyzed. The expression of the pump head and efficiency was derived by the energy equation. The results show that either on the long blades or on the short blades, the content of the solid particles increases with the increasing of the volume fraction. The results by the expression of the pump head and efficiency are compared with the results of the simulations. The conclusions show that the expression results are similar with the numerical simulation results, and the main factors of affecting the inner and outer characteristics are the solid particles.
Shadowgraph of Pulse CO2 Laser Induced Breakdown in Different Pressure Air
Authors: Zhang Yu , Li Duan Yong , Wu Tao
Published: February 2014

The expansion property of an infrared CO2 laser produced air plasma is characterized using a high-speed imaging shadowgraph technique. The shadowgraphs were taken by a time-gated intensified charge-coupled device at various delay times after single pulses induced gas breakdown. We examined five incident laser energy of 180, 240, 345, 420 and 600 mJ induced air breakdown at the pressure of atmospheric and 104 Pa. A shock wave produced by laser induced breakdown was also observed and its speed was measured as a function delay time between the breakdown and the shadow imaging under different air pressure. The experimental results indicated that the radial and axial shock wave front evolutions showed similar behavior, which increased fast with delay time at early stage and slowly at later stage. The propagation speed of the wavefront was about 2 cm/μs at the initial stage of breakdown, and then decreased very quickly. The propagation speed under low air pressure was higher than that of gases under high pressure and the spark sustained less time at lower pressure. The size of laser induced air spark increased with incident laser energy but not simple linear relationships.
The Affecting Gene Research of Metal Sheet Drawing Force on Compensate Fuzzy Nerve Net Control
Authors: Liu Zhan Jun
Published: February 2014

The evaluation theory of resistance affecting gene of metal sheet drawing force is proposed . The evaluated equation on compensate fuzzy control is introduced into resistance affecting gene , the model of affecting gene of metal sheet drawing force on compensate fuzzy control is built . The goal specimen is combined with the special predict results of affecting gene . It is showed that the affecting gene train of correct or error define on compensate fuzzy control . The total error of drawing force of affecting gene on compensate fuzzy control is 0. 06 percent .
Studies of Surface Roughening for Sapphire Substrate
Authors: Tsai Feng Che , Chang Ting Cheng , Lee Yann Long , Lin Chuan Lung
Published: February 2014

This study focuses on the process of the matte roughening technique of Sapphire. In order to effectively improve the shortcomings of conventional chemical etching, research adoptsthe micro abrasive jet machining technology with the experimental design method related experiments planned in order to effectively obtain the appropriate surface roughness and processing uniformity. Study found that # 800 Zirconium applied on the surface of sapphire with the initial surface roughness of about 0.9 μmRa for two minutes forms a surface roughness of about 1.1 μmRa. Not only does this conforms to the industrys sapphire surface specifications, it also effectively reduces the coarsening time and associated costs of sapphire.
Characterization of Microstructure, Phase Composition and Corrosion Resistance of Al-Zn-Si-RE Waterborne Coatings
Authors: Jiang Qiong , Miao Qiang , Liang Wen Ping , Ren Bei Lei , Xu Yi , Yao Zheng Jun
Published: February 2014

New waterborne Al-Zn-Si-RE coatings with improved corrosion resistance were introduced in this study. The corrosion resistance of Al-Zn-Si-RE coatings was evaluated by electrochemical measurements and salt spray test. Evolution of microstructure and phase composition at different exposure time in salt spray test was investigated by scanning electron microscopy and X-ray diffraction technique. The results indicate that Al-Zn-Si-RE coatings provide effective sacrificial protection to the steel substrate but exhibit lower corrosion rate and higher corrosion resistance compared to zinc aluminum coatings. The dense continuous corrosion layer formed on Al-Zn-Si-RE coating acts as a barrier layer, limiting the transport of aggressive species towards the coating-substrate interface and the corrosion rate of the coating; Zinc aluminum hydroxy carbonates are the dominant components in the corrosion layer of Al-Zn-Si-RE coatings.
Effect of Ca2+ on Structure and Corrosion Resistance of Conversion Coating Formed on Cast AZ91D Magnesium Alloys
Authors: Zhou Wan Qiu , Wu Shi Wei , Sheng Li , Li Xin
Published: February 2014

Phosphate conversion coatings was investigated on the surface of AZ91D magnesium alloy in a manganese dihydro phosphate baths. The influence of Ca2+ on coating microstructure was evaluate by scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX) techniques, and the corrosion resistance of the coating was tested by polarization curve methods in 3.5%NaCl. Surface observation results show that the conversion coating presents in crystal feature, and the coating containning Ca was uneven with large grains and small grains. The adding of Ca2+ compound in the bath was found to be important for the attainment of good combination between the coating and Mg alloy substrate. Polarization curve results indicate that the phosphate conversion coating containing Ca could enhance the corrosion potential and improve corrosion resistance.
Temperature Controlling System Design of Non-Isothermal Deep Drawing Mould for Magnesium Alloy Sheet
Authors: Yu Zu Jian , Li Jian Hui
Published: February 2014

The temperature and its distribution of non-isothermal deep drawing mould is one of the key technologies for magnesium alloy sheet forming process. It exerts a tremendous influence on the service life of deep drawing mould and affects magnesium alloy sheet deep drawing effect. An intelligent PID temperature controller with adaptive ability and self-organization was proposed to control the temperature of non-isothermal deep drawing mould, which included disk-shaped resistance heating coils heating die and blank holder, room temperature water cooling punch of the mould. The temperature control system greatly improved the quality of deep drawing parts of magnesium alloy sheet due to its simple structure, high anti-interference and high controlling precision.
Study on Micro Hydroforming of Metals
Authors: Luo Liang , Jiang Zheng Yi , Wei Dong Bin , He Xiaofeng
Published: February 2014

Micro hydroforming has an ability to manufacture complex 3D micro parts at a high production rate and has drawn increasing attentions. Brief understanding of macro hydroforming, for instance, deep drawing, is necessary to understand the principle of micro hydroforming. Then, special phenomena, such as size effects, occurred at micro scale are discussed and the related theories explaining these phenomena are introduced. Based on the similarities and differences between micro and macro hydroforming, experiments and simulation which consider the size effects are reviewed.
Application of Mass Scaling Technology in Steel Tube Rolling by Finite Element Simulation
Authors: Pang Ning , Zhao Zhi Yi
Published: February 2014

Based on Abaqus/Explicit operation platform, a finite element model of Yantai Baosteel Φ460mm PQF mill was established to study the mass scaling factors influence of the rolling process. The experimental results show that mass scaling factor has smaller impact on the temperature. Distortion of rolling force and Mises stress gradually occurs with the increase of mass scaling factor. Under the premise of ensuring the calculation accuracy, a best mass scaling factor is found to improve the computational efficiency of the model.
Multi-Objective Optimization and Research of Hot Stamping Process Parameters
Authors: Wang Tao , Lou Li Yan , Li Guo He
Published: February 2014

The hot stamping and quenching process of U-shaped parts is simulated by ANSYS/ LS-DYNA software. The influence law of forming process and temperature field in quenching process of U-shaped parts is obtained through the simulation of forming and quenching process under different blank holder force, punch velocity and mould initial temperature. The results show that plate temperature changes with the punch velocity and mould initial temperature changes, while the effect of blank holder force on plate temperature can be neglected.
Extracting Acoustic Emission Signal Feature of Grinding Processing
Authors: Huo Xiao Jing , Teng Jia Xu , Wang Wen Di , Shen Ai Min , Yang Jun Wei
Published: February 2014

Acoustic Emission (AE) may be defined as a transient elastic stress wave generated by the rapid release of strain energy in local area of material. To overcome the limitation of some traditional techniques, the AE technique, which provides high sensitivity and responding speed, were developed in the present paper. AE signature is usually difficult to be extracted and characterized in grinding process of 1Cr18Ni9Ti coatings due to their high hardness, great ductility, inhomogeneous structure and irregular surface with lots of hard points and pores. In this paper, AE signal of stationary grinding status before wheel-workpiece contact was characterized first, then AE signal of the grinding process was analyzed using root-mean-square (RMS) and power spectrum method. Results showed that before the contact occurred, the grinding signal is stable, with low amplitude and frequency ranging all frequency channels and no peak signal. However, when contact occurred, the RMS and spectrum of AE signal increased obviously and the bandwidth varied exquisitely between 100 KHz and 300 KHz. The real contact time between wheel and workpiece was about 0.5 to 1 ms.
Combined Atomistic-Continuum Modeling of Nano-EDM Process
Authors: Li He , Guo Jian Wen , Ming Wu Yi , Zhang Zhen
Published: February 2014

Nano electrical discharge machining (nanoEDM) method is an attractive measure to the manufacturing of parts of nanoscale dimension or precision, and is getting more and more interest of researchers, however, due to the incompleteness of EDM theories, the development of more advanced nanoEDM technology is impeded. In this paper, a hybrid simulation model, namely, combination of the molecular dynamics simulation model and two-temperature model of single discharge process in nanoEDM is constructed to study the machining process of nanoEDM from the thermal point of view.
Numerical Simulation of the Orthogonal Cutting of Carbon Fiber Reinforced Composite Material
Authors: Li Zhi Kai , Lu Dong , Wang Qiang , Wu Yong Bo
Published: February 2014

This work is focused on the study of orthogonal cutting of carbon fiber reinforced composite. A model based on finite element was developed. Through defining ultimate stresses of fiber tension cracking and fiber compression bucking, ultimate stresses of matrix longitudinal tensile and shear damage. Cutting forces obtained from the FE simulation matches well with the experimental observations. Than analysis cracking and crushing phenomenon of matrix in different fiber orientation, the influence of fiber orientation on sub-surface damage was studied, it shows that the cracking of sub-surface damage value increased with the increase of fiber orientation angle.
Application of the Laser Welding Technique in Aircraft Repair
Authors: Qi Jia Rui , Wei Hua Kai , Li Yan Li , Han Li
Published: February 2014

With the extensive use of new materials for aircraft structures, traditional riveting technology has been difficult to meet the demands of aircraft repairs. Laser welding of high concentration of energy is ideal technique for aircraft repair,because of its high welding speed, small heat-affected zone, perfect welding joint and small deformation of the welded structure. This article analyzes the application of laser welding technology in aeronautical aluminum alloys, titanium alloys and superalloys aircraft damage repair.
Microstructure and Hardness of Friction Welded SSM 356 Aluminium Alloy
Authors: Boonseng Kulyuth , Meengam Chaiyoot , Chainarong Suppachai , Muangjunburee Prapas
Published: February 2014

SSM 356 aluminum alloys was obtained from a rheocasting technique named gas induced semi solid process has globular structure on base. The friction welding method conserve microstructure that is similar to the original structure of the base material a globular structure. It is also found that a rotational speed of 1750 RPM, burn of Length of 3.2 millimeters and welding time (upset time) of 30 second can produce a very good weld. The results of the investigation have shown that a have average hardness in the range 58.13 HV.
Evaluation of Welding Metal Zones in the Case Welded with 0.5 Mo Filler Metal to Forged Steel for Piston Crown Material
Authors: Moon Kyung Man , Won Jong Pil , Park Dong Hyun , Lee Sung Yul , Kim Yun Hae , Jeong Jae Hyun
Published: February 2014

Since the oil price has been significantly jumped for recent some years, the diesel engine of the merchant ship has been mainly used the heavy oil of low quality. Thus, it has been often exposed to severely corrosive environment more and more because temperature of the exhaust gas of a combustion chamber is getting higher and higher with increasing of using the heavy oil of low quality. As a result, wear and corrosion of the most parts surrounded with combustion chamber is more serious compared to the other parts of the engine. Therefore, an optimum repair welding for these parts is very important to prolong their lifetime in a economical point of view. In this study, 0.5Mo filler metal was welded with SMAW method in the forged steel which would be generally used with piston crown material. And the corrosion properties of weld metal zone, heat affected zone and base metal zone were investigated using electrochemical methods such as measurement of corrosion potential, anodic polarization curves, cyclic voltammogram and impedance etc. in 35% H2SO4 solution. The heat affected and base metal zones exhibited the highest and lowest values of hardness respectively. And, the corrosion current density of the heat affected zone indicated the lowest value, having the highest value of hardness. It appeared that the corrosive products with red color was wholly covered on the surface of the base metal zone, while its products was not observed in the heat affected zone. The microstructure of the pearlite with black color was more or less observed in the base metal zone with patterns such as crystal and needle, in particular, the crystal pattern of ferrite microstructure with white color was considerably included in the base metal and heat affected zone, and the ferrite microstructure was significantly observed in the weld metal zone. In particular, the polarization characteristics such as impedance, polarization curve associated with corrosion resistance property were well in good agreement with each other.
Keywords: Forged steel, Microstructure, 0.5Mo filler metal, SMAW, Weld metal zone, Electrochemical method, Corrosion current density, Hardness.
Numerical Simulation on Stress Field in Inside-Beam Laser Cladding
Authors: Wang Ming Di , Hang Xiao Ling , Guo Kai Bo , Shi Shi Hong , Sun Lin Ning
Published: February 2014

In the process of deposition, the moving high energy heat source effect on the metal entity, and form the molten pool and the temperature field of directional conduction. Powder is accumulated in the substrate point by point, molten powder instantly solidify into a solid which is combined with substrate (or sediment) to reach metallurgical combination, from the perspective of the thermodynamic, the temperature field produced by coupling ring of heat source is regarded as a moving load to the base plate and the sedimentary section, and transient thermal stress field is generated, the load and boundary conditions (temperature field) of thermal stress field change over time, at the same time, the solution domain of thermal stress field change over time as a result. Therefore, through the life and death unit technology (ANSYS finite element analysis software of advanced analysis techniques) combined with the circulation order, the simulation of point to add deposition process is realized.
6D Laser Measurement System Based on Double Longitudinal Modes Laser
Authors: Dong Lu , Zhang Tao , Wu Yan Hua
Published: February 2014

In order to solve the problem about the requirements of CNC equipments high speed measuring and simultaneous measurement of Multi-dimensional parameters accurately, this research describes the 6 D laser measurement system based on two-longitudinal modes thermal frequency stabilization laser. Because it launches two polarized light which is perpendicular to each other and the differences between the frequencies are big enough, it has high measurement speed (can be reach 1.3m/s) and can measure roll angle with high accuracy, which is the shortage of the existing 5D/6D multi-dimensional laser interferometer.
The Effect of Electromagnetic Pulse Treatment on Thin – Wall Bearing Ferrules Dimensional Accuracy
Authors: Qiu Wang Biao , Chen Wei Xing
Published: February 2014

The article based on different frequency pulse equiponderance electromagnetic destressing comparison experiment, using vertical optical measurement to survey the changes of bearing ferrules size, study the difference between the effect of different frequency electromagnetic in removing residual stress, find the frequency of magnetic treatment pulse that help to maintain the stability of the thin-wall bearing collars' size, effectively improve the cycle of bearing ferrules process .
Catalytic Degradation of Phenol by γ-Fe2O3 Nanoparticles
Authors: Yao Yang Rong , Zheng Ying , Song Xu Chun
Published: February 2014

In the present paper, the γ-Fe2O3 nanoparticles have been successfully synthesized by the co-precipitation process and followed by calcination. The X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDS), scanning electron microscopy (SEM), and transmission electron microscopy (TEM) were used to characterize the as prepared nanoparticles. The results show that the phase structure of the nanoparticles is γ-Fe2O3 with the particle size ranging from 40 to 50 nm. The catalytic activity of the γ-Fe2O3 was investigated by decomposing the phenol in liquid phase. The results showed that γ-Fe2O3 has the highest catlytic activity.
Controlling the Size and Dispersion of ZnO@SiO2 Core-Shell Nanostructure by Addition of Triblock Copolymer Surfactant and pH Adjustment during Precipitation and Encapsulation Process
Authors: Sofyan Nofrijon , Yuwono Akhmad Herman , Steven Boy , Sholehah Amalia , Arief Muhammad
Published: February 2014

The potential use of ZnO nanoparticles for cell labeling application has been improved over past several years. Focusing to overcome the tendency of the nanoparticles to aggregation, in this work ZnO nanoparticles have been synthesized by using surfactant-assisted precipitation method. The samples were then characterized by using XRD and UV-Vis Spectroscope. The results showed that the presence of surfactant could help controlling the crystallite size to become smaller (4.02 nm) as compared to the conventional precipitation method (9.45 nm). ZnO nanoparticles that had been coated by the surfactant was then re-coated again by silica shell to form ZnO@SiO2 core-shell. The presence of F-127 coating on the surface of the nanoparticles made the dispersion and the stability of crystallite size better in various encapsulation pH value (4.04 4.32 nm). The band gap energy of the ZnO nanoparticles (3.145 3.085 eV) also showed a good correlation with the crystallite size (4.02 10.38 nm). Therefore, the resulting ZnO@SiO2 core-shell in the present work are potential to be used in cell labeling application.
Enhancing the Fluorescence of Graphene Quantum Dots with a Oxidation Way
Authors: Han Ting , Zhou Xue Jiao , Wu Xiao Chen
Published: February 2014

It is a facile and efficient way to produce grapheme quantum dots (GQDs) through photo-Fenton reaction. However, the fluorescence of the as-generated GQDs is weak. Here, bright yellow-green fluorescent graphene quantum dots (GQDs) were prepared by post-oxidation of the GQDs with H2O2. The fluorescence quantum yields of the post-oxidized GQDs (O-GQDs) increased from 0.08% to 3.3% and the maximum emission wavelength shifted from 450 to 510 nm. The O-GQDs exhibit excitation-independent and pH-dependent photoluminescence behaviors. The increase of the photoluminescence intensity is attributed to the more carbonyl and carboxyl groups after the post-oxidation. The post-oxidation treatment offers a simple pathway to enhance the fluorescence of GQDs.
Effects of CeO2 Addition on Mechanical Properties of LaB6/B4C Composites
Authors: Guo Jia Meng , Yi Lei , Peng Ke Wu , Ma He Li , Chen Ren
Published: February 2014

The properties of CeO2-LaB6/B4C composite material prepared by hot pressed sintering method was tested, CeO2as a sintering aid for boron carbide is investigated in this paper. The study shows: the hardness of CeO2-LaB6/B4C composite increases with the content of CeO2. The density, hardness, flexibility strength and the fracture toughness of LaB6/B4C composites is greatly improved compared by CeO2additive. When the content of the CeO2is 1wt%, LaB6/B4C composite has its the best mechanical properties. The density reaches its supreme value of 2.676 g/cm3, the hardness reaches its supreme value of 39.19 GPa, the flexibility strength reaches its supreme value of 354.15 MPa and the fracture toughness reaches its supreme value of 5.15 MPa.m1/2. In conclusion, the density, hardness and flexibility strength of LaB6/B4C composite is improved by CeO2additive. However,it gives little effect on fracture toughness of LaB6/B4C composite. The main fracture way of CeO2-LaB6/B4C composite material is intercrystalline rupture, while the transcrystalline rupture is minor.