bluuebunny/crossref_metadata_2025 huggingface dataset:
Simulation of Recrystallization Behavior and Austenite Grain Size Evolution during Hot Deformation of Low Carbon Steel Using the Flow Stress
Authors: Wang Jian , Xiao Hong , Xie Hong Biao , Xu Xiu Mei
Published: September 2011

Microstructure evolution can cause changes in dislocation density during hot plastic formation of metals and greatly influence the shape of flow curves. Recrystallization kinetics and average grain size were simulated by the coupled flow stress model describing dislocation development and microstructure evolution. The model for microstructure evolution considered different kinds of recrystallization in the same process rooted from nucleation and grain growth. Flow stress was calculated from the average dislocation density determined by the dislocation density model, which took into account hardening and recovery during the hot deformation process. Model parameters were defined by inverse analysis of flow curves obtained from hot compression tests and were completed through solving a nonlinear least-squares problem with constraints using optimization methods. Finally, the results obtained by the proposed model were compared with experimental results.
Numerical Simulation and Defects Analyses of Titanium Aluminide Based Alloys Powder Forging
Authors: Zhang Wei , Liu Yong , Zhang Ming Yang
Published: September 2011

Powder forging is an important method for behaviors in a closed die, including the net shape. In order to study the deformation characteristics, the closed die block forging of Ti-Al powder preforms was simulated by commercial plastic forming software DEFORM-3D, using a change of temperature, stress and strain at different regions of the billet. Based on distributions of the stress and strain, the occurrence of defects was analyzed. It indicates that some defects may occur near the edge of preform during the plastic deformation process. At last, the predicted results were evaluated by experiments.
Material Modeling and Correlative Mechanical Testing on AHSS Sheet Forming Simulation
Authors: Chen Ke , Lin Jian Ping
Published: September 2011

The finite element method is widely used to numerically simulate sheet forming processes. The increasing use of advanced high strength steel (AHSS) sheet places an increased demand on accuracy of forming simulation and springback prediction. Appropriate identification and characterization of material behavior are of vital importance to improve the simulation accuracy. An overview of yield criteria and hardening laws of material constitutive models are presented in this work. Because of the anisotropic yield behavior and Bauschinger effect of AHSS sheet materials, suitable anisotropic yield model in combination with anisotropic hardening law is one essential component for successful AHSS sheet forming simulation and springback prediction. Necessary mechanical tests for determination of parameters of material constitutive models are given in this paper, the advantages and already known limitations of different test procedures are also discussed. Recommendations on choose or further improve the constitutive models are given for enhance the efficiency and accuracy of AHSS sheet forming simulation.
Research on Hot State of Mould Copper Plate with High Casting Speed
Authors: Sun Li Gen , Li Hui Rong , Zhang Jia Quan
Published: September 2011

High casting speed has a great influence to thermal state and strain/stress field of the mould copper plate. The coupled visco-elasto-plastic FEM models have been presented for thermal process analysis of steel shell and the mould copper plates. It is shown that, when the casting speed is increasing, the turning point of the temperature distribution curve is getting further to the meniscus; and the increasing casting speed has no influence to the equivalent strain distribution along the thickness direction of the mould.
Finite Element Analysis of Pump Casing for Triplex Plunger Pump Based on Abaqus
Authors: He Xia , Huang Chong Jun , Liu Qing You , Liu Yang , Tian Jia Yu
Published: September 2011

The force of pump casing for triplex plunger was very complex, as well as the loads varied with the angle of crankshaft rotation. Using VB programming software obtained the load of pump casing anywhere, then 3D models of pump casing of triplex plunger pump have been created by utilizing Pro/E, and strength calculation of the pump casing was analyzed by utilizing Abaqus software in six different load conditions. The results indicated that the dangerous cross section and the stress distribution have been found and the maximum stress of the pump casing was 297.3 MPa, which was less than the limit of yielding strength but met the overall strength of pump casing. This research was significant for the reliability evaluation and the design improvement of the pump casing.
The Simulation of Compression Performance of Aluminum Foams Base on DEFORM
Authors: Wang Lu Cai , Wang Yan Li , Wang Fang , You Xiao Hong
Published: September 2011

Two kinds of cell models, include of Octahedron cell model and Tetrakaidecahedron cell model, were analyzed for the open-cell Aluminium foams. Simulation results show that the compression load-time curves of the two models have the same trend. There are three stages, elastic region, yield region, densification region. In addition, The Tetrakaidecahedron model calculation and predication show good agreement with the experimental results. Its simulation results of platform stress closer to the experimental value in the two models. Therefore, Tetrakaidecahedron model was the best choice to simulate the aluminium foams.
Improvement of Die-Roll Quality in Compound Fine-Blanking Forming Process
Authors: Huang Xin Hua , Xiang Hua , Zhuang Xin Cun , Zhao Zhen
Published: September 2011

Nowadays, the compound fine-blanking forming process is one of the most important processes to produce complicate multifunctional parts without subsequent machining. However, the big die-roll occurs in the sharp area is a common problem in this process. In this paper, the method with negative punch-die clearance was proposed to solve this problem by comparing three feasible plans. In addition, the influence on the process with different value of the negative punch-die clearance was studied by the finite element method (FEM). The results of this study verified that the process with suitable value of the negative punch-die clearance can result in significant decrease of the die-roll size. The relationship between the material flow near the region of die-roll and the punch-die clearance was also clarified.
Feasibility Study on HRS Substituting CRS of Automobile Inner Panels Based on Numerical Simulation and Field Test
Authors: Lv Xiang Yu , Li Sheng Li , Li Na , Cai Yong Hong
Published: September 2011

The paper starts with a brief overview to the material used in auto panels , then leads to HRS Substituting CRS that SPHE hot-rolled steel substitutes ST13 cold-rolled steel in auto inner parts production. Through the composition of material chemical and performance parameters, simulation and stamping, the feasibility of HRS Substituting CRS is verified by Numerical simulation and field test.
Characterization of Micro-Arc Oxidation Coatings Formed on Biomedical Ni-Cr-Mo Alloy
Authors: Xu Ji Lin , Yu De Zhen , Luo Jun Ming
Published: September 2011

In this paper, the micro-arc oxidation coatings formed on biomedical Ni-Cr-Mo alloy were characterized by surface and cross-sectional morphologies, chemical and phase compositions and corrosion resistance using scanning electron microscopy (SEM), Energy dispersive X-ray spectrometer (EDS), X-ray diffraction (XRD) and potentiodynamic polarization test, respectively. The results show that the coating is mainly composed of γ-Al2O3 crystal phase with a little Ni content. The coating possesses a typical porous surface and has a thickness of ~6 μm. The corrosion resistance of the coated sample is greatly improved compared with the uncoated Ni-Cr-Mo alloy.
An Optimization of the New Die Design of Sheet Hydroforming by Taguchi Method
Authors: Hosseinzadeh Morteza , Zamani S. Ali , Taheri Ali
Published: September 2011

During the last few years, several sheet hydroforming processes have been introduced. Despite the advantages of these methods, they have some limitations. Of the processes, the two main ones are the standard hydroforming and hydromechanical deep drawing. A new sheet hydroforming die set was proposed that has the advantages of both processes and eliminates their limitations. In this method, a polyurethane plate was used as a part of the die-set to control the blank holder force. This paper outlines the Taguchi optimization methodology, which is applied to optimize the effective parameters in forming cylindrical cups by the new die set of sheet hydroforming process. The process parameters evaluated in this research are polyurethane hardness, polyurethane thickness, forming pressure path and polyurethane hole diameter. The design of experiments based upon L9 orthogonal arrays by Taguchi was used and analysis of variance (ANOVA) was employed to analyze the effect of these parameters on the forming pressure. The analysis of the results showed that the optimal combination for low forming pressure is harder polyurethane, bigger diameter of polyurethane hole and thinner polyurethane. Finally, the confirmation test was derived based on the optimal combination of parameters and it was shown that the Taguchi method is suitable to examine the optimization process.
A Numerical Method to Predict Packing Density of Aggregates in Concrete
Authors: Reisi Mohammad , Nejad Davood Mostofi
Published: September 2011

It is nowadays very clear that the single most important parameter influencing the performance of concrete is the packing density of the aggregates. Among aggregate characteristics, grading of aggregates has the most significant effect on packing density (PD) of aggregates. In the current sstudy, packing density of five aggregates were measured by experimental tests and computer simulation base on discrete element method (DEM). Obtained results show that the performed computer simulation is very efficient method to predict packing density and optimization grading of aggregates.
Finite-Element Analysis of the Double Lateral Compression of Clad Tube into a Symmetric Square-Tube
Authors: Chen Tsung Chia , Ye Jiun Ming
Published: September 2011

The squaring process to shape a circular tube into a symmetric square clad tube is examined by a three-dimensional incremental elastic-plastic finite-element method based on an updated Lagrangian formulation. The effects of various parameters, such as geometric ratio R/t, strain hardening exponent n, friction coefficient μ, and the length of tube L, on the occurrence of collapse in the squaring process are discussed and interpreted in a theoretical manner. The findings show that geometric ratio is the major factor in the process of squaring circular tubes. When R/t=25, serious collapse is likely to appear. Aiming at circular tubes with geometric ratio R/t=25, this study proposes six analysis configurations for clad tubes to discuss the possibility of clad tubes avoiding collapse. The findings showed that clad tubes could effectively reduce the collapse ratio.
Analysis of Optimal Vertical in Angular U-Bending Process
Authors: Chen Tsung Chia
Published: September 2011

This study aims to analyze the effects of angular U-bending process on the springback of metal sheets. Based on Updated Lagrangian Formulation (ULF), the 3D incremental elastic-plastic Finite Element Method was inferred to simulate the U-bending process of metal sheets. The die/blank holder profile with angles of α=-4°, α=-2°, α=0°, α=2°, α=4° and die/punch profile with radiuses of Rp=Rd=6.0mm were analyzed to determine the influence of tool angles on the springback. With different tool angles to proceed the U-bending process of metal sheets, it is found that the larger or smaller die angles, the more springback magnitude. When perpendicular U-sheets are required, θ1 of the U-sheet presents 90 degree on the tool angle α=-1.2° and θ2 shows 90 degrees on the tool angle α=-0.4°. The aim of this study is to investigate the effects of angle variables on the springback in the U-bending process and to obtain useful data from the industrial field.
The Mechanical Properties of the Superplastic Zn-22Al Alloy at Different Processings
Authors: Kong Ling Jun , Dong Xue Hua , Chen Yan Bei , Ning Xiang Liang , Wang Jing Tao , Liu Jin Qiang
Published: September 2011

To develop a superplastic damper, the mechanical properties of the superplastic Zn-22Al alloy differently processed are studied by the test, at room temperature. It is indicated that the alloy at the air cooling after rolling processing has better mechanical properties at room temperature, such as higher ductility and lower work-hardening, which is very useful to a seismic damper.
Research on the Predicted Model of the Surface Roughness in Dry Turning Hardened Steel
Authors: Tu Chun Juan , Gu Xiao
Published: September 2011

Researching on the mathematic model of surface roughness in machining hardened steel was to provide the reference for the surface roughness prediction. The contrast experiments of dry turning hardened steel were carried out with ceramic tool (CC6050), cubic boron nitride tool (CB7025) and kentanium tool (GC2025), the surface roughness was measured using 2025 surface roughness tester, the predicted models of the surface roughness were built by Particle Swarm Optimization (PSO) algorithm, the reliability analysis was given out, the shape of chips was observed by scanning electron microscope (SEM). Results proved: the reliability of the predicted models built by PSO was to be verified, it could reflect the relation between the surface roughness and cutting parameters exactly. The feed rate was found out to be dominant factor on the surface roughness in turning with three tools. The saw-tooth chips could decrease the cutting temperature and improve the surface quality.
Application of Finite Element Software in Fatigue Analysis of the Welded Joints
Authors: Fan Wen Xue , Chen Fu Rong
Published: September 2011

Based on the fatigue behaviors of welded structure and the distinction between static fatigue and vibration fatigue and sound fatigue, the general fatigue analysis methods of static fatigue and vibration fatigue are introduced in this paper, such as nominal stress method, structure stress method, hot stress method and power spectral density method. Especially application status and common software of finite element analysis are expounded and analyzed in fatigue analysis of the welded joint. In recent years, finite element technology is applied widely on analysis all kinds of welded joints, the main problems include two points, built suitable model and generated reasonable mesh. Nowadays, finite element software has many kinds of usage and different software has different functions. According to the stress analysis process of static fatigue and vibration fatigue, three large-scale general finite element software ANSYS, MSC.NASTRAN/PANTRAN and ABAQUS, some comparative analyses have been done in building model, partitioning mesh and applying method At last some important conclusions are given. Different finite element software has equivalent development background and reliable analysis performance. Different finite element software have different application platform. In order to get better analysis result, each other’s merits are drew from different software and matched with the application.
Influence of Cutting Conditions on the Cutting Performance of TiAl6V4
Authors: Ye Gui Gen , Xue Shi Feng , Tong Xing Hua , Dai Lan Hong
Published: September 2011

The FEM simulation was developed to investigate the influences of cutting speed, uncut chip thickness and tool rake angle on the cutting performance of TiAl6V4. The FEM simulation was validated using experimental results and good agreement was obtained. The simulation results indicate that the transition from continuous to saw-tooth chip formation is favored by increases in cutting speed and uncut chip thickness and a decrease in tool rake angle. The existence of Salomon’s assumption was further discussed, which shows that the Salomon’s assumption is not valid for the tool-chip interface temperature, but could be true for the surface temperature of the workpiece. In addition, decreasing the uncut chip thickness leads to an increase of the specific cutting energy, which could be primarily caused by an increase in the shear strength of the workpiece material due to a decrease in the PSZ temperature.
Influence of Ultra-Fast Cooling Technology on Microstructure and Mechanical Properties of Ti-Microalloyed Steel
Authors: Yi Hai Long , Xu Yang , Liu Zhen Yu , Wang Guo Dong , Wu Di
Published: September 2011

In recent years, the ultra-fast cooling process is a new technology used to control the strip cooling process in the international which corresponds to an average cooling rate higher than 150°C/s. This new technology can provide an effective means to the development of low-cost and high-performance steels. In this paper, the phase transformation temperatures, microstructures and mechanical properties of a Ti microalloyed steel were investigated by means of a themomechanical simulator and a D450mm mill equipped with ultra-fast cooling device. The results show that the phase transition temperatures decreased and micro-hardness increased with the increasing of cooling rate. The microstructures of steel used ultra-fast cooling process was small and more uniform than the ones used laminar flow cooling and air cooling process, and finer and uniformity dispersed precipitates can be produced under ultra-fast cooling process, hence higher yield strength and good elongation was obtained for the steel. The ultra-fast cooling technology has a good effect on the microstructures and properties of the Ti microalloyed steel.
Mechanical Analysis of Machining Error in Turning Slender Shafts by Reversible Turning Technique
Authors: Wang Hong , Men Xiao Shuang , Zhang Yu Xian , Yao Fang , Wang Li Fu
Published: September 2011

Mechanical analysis is carried out to the deformation of workpiece when turning slender shafts in the normal and reversed direction under two different conditions of clamping. Mathematical models are set up for the calculation of bending deformation resulting from cutting force in condition of normal and reversed turning. An example is given to show that bending deformation and the resulting machining error in conditions of reversed turning is much less than that in normal turning. The result has been verified by experiments. The mechanical model and numerical analysis can be used in the processing design of slender shaft turning.
Experimental Study on the Influence of Nozzle Diameter on Abrasive Jet Cutting Performance
Authors: Zhang Yu Xian , Wang Li Fu , Yao Fang , Wang Hong , Men Xiao Shuang , Ye Bing Bing
Published: September 2011

Waterjet abrasive nozzle is the key component for accelerating abrasive particle velocity and its diameter has important influence on water jet. The relationship between nozzle diameter and waterjet cutting performance has been studied by experiment. The results show: The incision depth and width of specimen decrease linearly with the decreasing of nozzle diameter; The linearity of jet moving direction and the size of kerf angle of specimen are independent of nozzle diameter. Under the same pressure, reducing the nozzle diameter make the penetration capability to reduce, thus, the cutting quality decrease.
A Study on the Polishing Mechanism of Silicon Carbide (SiC) Optic Surface
Authors: Fan Di
Published: September 2011

This paper studies the polishing mechanism of SiC optic surface; it also introduces the grinding mechanism of ceramic material – indentation fracture model. In this paper, the model of SiC polishing in ideal condition is analyzed and the mechanism of SiC polishing in real state is studied.
Deflection Analysis of the Thin-Web Workpiece Structure Using Similarity Concept
Authors: Mohamad Nurhaniza , Arifin M.K.A.M. , Ali Aidy , Mustapha Faizal
Published: September 2011

The thin-web structure component is widely used in aviation and aerospace industries with the reason of light weight and high performance. However, the thin-web components are tending to deflect because of their poor rigidity and the effect of cutting force during cutting process. It is required to perform of high-speed machining that can remove the large number of material in a shorter time in order to allow machining of such structure. The performance of high-speed machining operation is restricted by the static and dynamic stiffness of the tool and part that can cause some problems such as regenerative chatter and ‘push-off’. The tool path plays an important function to avoid the problem occurs as it assists to reduce the workpiece vibration during machining. The optimization of tool path is done by determining the element removal sequences and the materials removal are implemented using milling cutter. The maximum deflection for each element removed is recorded in order to define the optimum solution of element removal sequences. The analysis shows that there are significant effects of workpiece stiffness with relation to the cutting parameters setting.
Development of In-Process Chip Breaking Detection by Using Cutting Force and Temperature Signals
Authors: Klungphon Kitikun , Tangjitsitcharoen Somkiat
Published: September 2011

In order to realize the intelligent machines, an in-process monitoring system is developed to detect the continuous chip and the broken chip regardless of the cutting conditions on CNC turning by utilizing the power spectrum density, PSD of dynamic cutting force and the variance of the dynamic cutting temperature, which are measured during the cutting by employing the dynamometer and the infrared pyrometer. The broken chip formation is required for the reliable turning operation. The preliminary experiments suggested that there are basically two patterns of PSDs of chip forms. One is the case of relatively high PSD of the dynamic cutting force at low frequency range, which corresponds to the continuous chip formation. The other is the case of relatively large PSD of the dynamic cutting force observed in a frequency range corresponding to the chip breaking frequency when the broken chip are formed. The variances of the cutting temperature are also significantly different between the broken chip and the continuous chip. Hence, the method has been developed by using the PSD of dynamic cutting force and the variance of cutting temperature to determine the proper threshold values for classification of the broken chip and the continuous chip during the cutting. The new algorithm is proposed to obtain the broken chip by changing the cutting conditions during the cutting process. It has been proved by series of cutting experiments that the broken chip can be well identified by the proposed method even though the cutting conditions are changed.
Fatigue Crack Growth Rates in Friction Stir Welding Joints of 7075-T6 Al Alloy and Fatigue Life Prediction Based on AFGROW
Authors: Zou Bin Lian , Yang Xin Qi , Chen Jia Hua
Published: September 2011

In this work, a study of fatigue crack propagation (FCP) behavior of friction stir welding (FSW) joints of 7075-T6 aluminum alloy was carried out. Fatigue crack growth rate curves were determined for cracks growing in different locations of the welding lines, including prefabricated crack through welding seam center, advancing side (AS), retreating side (RS), and vertical to welding seam. A computational simulation of fatigue crack propagation was conducted by AFGROW with different stress ratios R, and the effects of R on FCP rate were analyzed. Results showed that the FCP rate in RS of the Heat Affected Zone (HAZ) was the lowest and the highest was in the region vertical to the welding seam. In the low stress intensity factor range (△K) region, the FCP rate in Nugget Zone (NZ) was lower than that in AS of the HAZ, but in the high △K region, the situation was contrary. Reasons of the results were analyzed. Compared with the standard of International Institute of Welding (IIW), FCP rates in all regions were lower and it concluded nice fatigue properties of FSW 7075-T6. The simulation made in terms of crack propagation rate (da/dN) versus △K generally showed a good agreement with the measured values. The study of effects of different R on FCP rates based on AFGROW indicated that FCP rates increased with increasing R.
Researches of Warm Extrusion Forming Technology and Property on 42CrMo Steel Cutting Pick
Authors: Su Chun Jian , Zhang Guang Heng , Zhao Jun
Published: September 2011

Cutting pick is a kind of widely-used consumptive mining tool, however its body is easy to break in the mining producing process, the problem that pick body easy to break could be solved by using the warm extrusion forming techniques under the premise of without raising the material level. This paper mainly focuses on the structural characteristics and material technological properties of 42CrMo high-strength steel cutting pick body, and adopts the power balance principle got the approximation of the deforming force, and derived the approximate calculation formula of warm extrusion force for cutting pick body; and analyzed the temperature field, equivalent stress, strain field and metal’s flowing rate field of warm extrusion forming by adopting numerical simulation method, and verified the result with the experiment. The result shows that the material organization grains of cutting pick produced by the new technique could be refined; the pressing direction of cutting picks’ shape outline forms forging streamlines, the quality is good. In a word, this new technique could completely meet the requirement of cutting pick.
Lubricating Performances of Nano Organic-Molybdenum as Additives in Water-Based Liquid during Cold Rolling
Authors: Wang Bing , Sun Jian Lin , Wu Yuan Yuan
Published: September 2011

The non-parathion nano organic molybdenum (Nano-Mo) was adopted to substitute for the conventional extreme-pressure and anti-wear additives, uniformly dispersed in water-based cold rolling liquid for steel strips. The tribological properties of the water-based cold rolling liquid were tested by the four-ball machine, and the lubricity of the cold-rolling liquid for steel strip was evaluated on the 4-high cold rolling experiments. Besides, the worn surfaces of the steel balls were observed by an optical microscope. Results indicated that Nano-Mo as additive in water-based cold rolling liquid, compared with the conventional emulsions, PB values was increased by 4%, and friction coefficient and wear scar diameter were decreased by 10.8% and 13.1%, the lubricity of rolling liquid was verified by cold rolling test which showed that this liquid had the excellent lubricant performance to reduce the rolling force, save energy consumption and get thinner strip. Optical microscope was used to observe the strips surface which showed that strip surface streaks were clear, scratches were less and shallow. By roughness test and EDS analysis, defects were filled with nanoparticles, friction and wear were reduced effectively. In addition, tensile properties had been studied after rolling lubrication, but the results showed no significant effect.
Stiffness Analysis of Spot-Weld Specimen in Finite Element and Experimental Comparison
Authors: Yin Hai Tao , Zhu Tao , Miao Bing Rong
Published: September 2011

Three typical finite element models (FEM) of spot-welds have been created as analysis objects, and the relationship between force and displacement of the specimens were obtained under shear and tensile forces through the elastic-plastic finite element analysis. Simulation results and the shear-tensile test curves of TG301L and SUS301L stainless steel specimens which were obtained based on JIS Z 3136 shear-tensile test methods were compared. The results showed that: No matter what type of nuclear simulation, stiffness of simulation models are less than the actual stiffness of the specimen; and when the specimen was stretched and sheared, with solid element to simulate the nugget can get maximum stiffness, it is most close to the actual stiffness, umbrella model is followed, and a stiff beam model is the worst.
Effect of Alloying Element Addition on Transition Interface Reaction Zone in Metal Matrix Composite Processing by Cast Infiltration
Authors: Shan Quan , Li Zu Lai , Jiang Ye Hua , Zhou Rong , Sui Yu Dong
Published: September 2011

In metal matrix composite, the matrix and reinforced body is different in physical and chemical properties. The transition effect of reaction zone between the matrix and reinforced body is the hot point in research aboat metal matrix composite. The steel substrat casting tungsten carbide particle surface reinforced compostie is research object in this article. The interface reaction zone is measured by EDS line scaning. The problem is solved by statistic that interference between scaning neighbour points leads to the emergence of sawtooth wave, the processed curve is beneficial to observe. The effect and effect curve of W、Mo、Ni addion is received in the interface reaction zone.
Cause Analysis of Buttress Premium Thread Connection Pullout for a Well
Authors: Pan Zhi Yong , Song Sheng Yin , Liu Wen Hong , Wang Jian Jun , Wang Xin Hu
Published: September 2011

The buttress thread connection was used in deep well or ultra-deep well widely because of its high joint efficiency. Pullout failure scarcely happen on buttress premium thread connection with great joint strength and good sealing property. Direct evidences about connection dropout couldn’t get in most cases by reason of casing string had fallen into well or casing string had been concreted in formation by cement. Now the difficulty of analysis on pullout is higher and higher. A buttress premium thread casing joint had pulled out at mill end of coupling in a straight well and dropout casing string couldn’t get out of the well. Research on this pullout case was carried out combining relative theories with tests. Macroscopic analysis and dimension measurement were done for dropout coupling. The material’s physical and chemical properties were checked. Thread inspection and full-scale tests were done for two casing simples that are same lot with pullout. Metallograph analysis was carried out on load flank and guide flank in box thread of pullout coupling and same lot new coupling. The results showed that dropout failure was ascribe to inadequate make-up torque at mill end of pullout coupling and complex downhole condition and improper handling in the oil field. On the other hand joint’s strength decline on the effect of unsuitable heat treatment to coupling and greatly uneven black crested pin thread around circumference. The pertinence measures were laid down at the end of this passage.
Finite Element Analysis of the Effect of Hardness on Contact Stresses in Port Crane Wheel
Authors: Wu Jiang Wei , Wang Peng
Published: September 2011

In port crane industry, the surface hardening technique is widely used in order to improve the strength of wheel. From the practical experience, when the high hardness hardened wheel is used, the danger of sudden break of the wheel is increased. How the hardness of the wheel effect the fatigue life of the wheel is not studied theoretically. In this paper, the contact stresses in wheel with different hardness have been analyzed by applying three-dimensional finite element model. Based on this model, the ANSYS10.0 finite element software is used. Three different plastic slopes are used to simulate three different hardness materials. Surface hardened wheel with three different hardness materials, and three different vertical loads are applied. The effect of hardness of a surface hardened wheel is discussed by comparing the contact stresses from the numerical results. The reason of the sudden failure of the high hardness hardened wheel is discussed, and some suggestions are given in choosing hardness of the hardened wheel.
Study on Layered Processing Theory of Slender Inner Helical Surface
Authors: Zheng Hua Lin , Guo Gao Lei , Jia Zheng Shou , Liu Bing Shen
Published: September 2011

To solve the difficult and low-efficient processing problems of slender inner helical surface, the layered processing theory and method of slender inner helical surface based on slender inner helical surface structure in screw drill stator as the research object is put forward. The whole processing of slender inner helical surface is innovated by simple layer processing, which reduce the processing difficulty and improve manufacturing efficiency. The key techniques are studied such as screw drill stator structure, the design method and processing technology and the analysis and calculation of interference, which provide the theory for layered processing of slender inner helical surface structural components processing.
Study on Calibration for Parameters of Johnson-Cook Constitutive Equation
Authors: Li Jian Guang , Cao Jie Dong
Published: September 2011

Procedure of determination for parameters of Johnson-Cook model, which is widely used in numerical computation and design for manufacture process, is made. The paper describes fundamental investigation of Johnson-Cook constitutive equation firstly, then quasi-static compression experiment MTS is reviewed briefly, and dynamic compression experiment SHPB is studied from all aspects of experimental principle of one dimension stress wave, experimental measurement system to experimental data handling. In the end methods of Calibration for A, B, n, C and m of Johnson-Cook constitutive model’s parameters are discussed in details.
Different Failure Styles for Aluminum-Alloy Strip with Two Holes under Cyclic Tensile Loading
Authors: Wang Fang Wen , Zuo Hong , Wen Yi
Published: September 2011

This paper reports seven failure styles found in our experimental investigation for the failure between two neighbor holes located at different angle in an Aluminum-Alloy strip under cycle tensile loadings. In some cases, unlike expected, the initial fatigue crack is found not to nucleate at the center region between the two holes, where the stress concentration is larger than other region. In fact, the initial fatigue crack always nucleates at the outside rim of two holes far apart from the center region. The coalescence between the two holes always occurs far after the initial fatigue crack nucleation.
First Principles Calculation on Adsorption of S on Fe(100)
Authors: Zhi Zhang , Luo Qiang , Ran Zeng Ling , Shi Tai He
Published: September 2011

Using the first principles method, which is based on the density function theory (DFT), the structures and electronic properties of S atoms are adsorbed on the Fe (100) surface, and their molecular orbital and binding energies were calculated with the generalized gradient approximation. The results show that the S atom is adsorbed hollow site is stable. With partial density of states, we have obtained the interaction of s and p states for S and Fe. It shows that the interaction between the S adsorption on the clean Fe (100) surface does lead to FeS comes into being.
Design of the CY7C68013 Firmware Program for Data Collection and Parameter Control
Authors: Kong Wei Peng , Qin Hui Bin
Published: September 2011

USB2.0 interface (Universal Serial Bus) is a commonly used high-speed Serial Bus interface. Its main characteristic is high-speed transmission, which can solve the problem of transferring magnanimous data between PC and Embedded system well. This paper designed a kind of CY7C68013 Firmware program for data collection and parameter control under the SLAVE mode. The experimental results show that the design can well satisfy the demand of uploading batch data rapidly and controlling parameters accurately.
Study on the Mechanical and Physical Properties of Lotus Kernels
Authors: Ma Qiu Cheng , Zhou Yin Bin , Ling Dou
Published: September 2011

The mechanical and physical properties of lotus kernel play an important role in deep processing of lotus seeds. This paper established an empirical distribution function of random variables of the shape parameters of lotus kernels. The relationship between the moisture content and the hardness was analysed, and the compression strength of the different surfaces of the same lotus kernels were compared. The results indicate that, with the same moisture content, there is a centralized distribution section for lotus kernel shape. The density of a lotus kernel is higher than that of water. The higher the moisture content, the lower hardness. And the lower moisture content, the higher hardness. Compressed from different directions, the compression strengths of the lotus kernels are different.
The Application of Electrical Contact Resistance Test in Corrosion Characterization
Authors: Xi Jian Jun , Zhao Jun , Yang Ning
Published: September 2011

This paper introduces a way to characterize corrosion using contact resistance and points out the noticed problems during the test process. By characterize the corrosion degree using electrical contact resistance, surface morphology and contact pressure should be proper to the metal contacted. It is quantitative to investigate the anticorrosion performance of the oil and paste smear layer and corrosiveness of gas environment and liquid environment.
A Study on the Protective Performance of Viscous Organic Layers Based on EIS
Authors: Xi Jian Jun , Zhao Jun , Yang Ning
Published: September 2011

The previous study on the protective performance of organic layers pays almost all attention to the layers in solid phase. This paper presents a viscous layer prepared by adding the active agent and nanometer copper powder into the dimethyl silicone respectively and studies this layers’ protective performance with EIS method.
The Influence of Water in Fuel Tank Environment on Fatigue Property of Pre-Corroded 7XXX Aluminum Alloy
Authors: Hui Li , Zhou Song , Xu Liang , Ma Shao Hua , Wang Yan , Zhang Ying Ying
Published: September 2011

The fatigue life experiments of the pre-corroded 7XXX aluminum alloy(Kt=1 and Kt=3)were tested in environment of laboratory air and water in fuel tank, the median fatigue life and the safe fatigue life of the reliability of 99.9% and confidence of 95% can be obtained. The fatigue life of the pre-corroded 7XXX aluminum alloy reduced significantly because of the water in fuel tank environment, the fatigue life in the environment with water in fuel tank was 6.253% (Kt=1) of the fatigue life in laboratory air environment under the high stress level, the fatigue life with water in fuel tank environment significantly reduced under the low stress level, it was 1.658%(Kt=1) of the fatigue life in laboratory air environment. The fatigue life in the environment with water in fuel tank in different stress level was reduced almost fairly (Kt=3), it was 20.63% (Kt=3) of the fatigue life in laboratory air environment.
Influence of Technological Parameter on Boehmite Sol Sealing Anodized Al 2024 Alloy
Authors: Zhou Qi , Xiao Xuan , Ren Guang Jun , Song En Jun , Wang Yu Feng
Published: September 2011

The boehmite sol is prepared with cheap inorganic salt Al(NO3)3and NH3H2O. The anodized aluminum alloy was sealed with the boehmite sol. Influences of concentration of Al3+, pH and temperature of sol on the properties of sol and the sealed film were studied. The results shows that the viscosity of sol increases and the stability becomes lower with the increase of Al3+concentration and pH of sol. The viscosities of sol become lower with the rises of its temperature. The thickness of anodized film increases when sealed with boehmite sol. The thickness value of sealed film increases with the increase of the sol viscosity. The properties of sealed film are better while the color of sol is azury. The corrosion resistance of sealed film was enhanced with the pH rising from 5.5 to 7 at the same concentrate and temperature of sol. The corrosion resistance in acidic solution is improved remarkably for sol sealed film as the sol temperature rises up to 60°C. The time of changing colour for sol sealing film is longer than that of the film sealed by distilled water.
Experimental Study of Thermal Contact Conductance with Compensation Heater
Authors: Wang Zong Ren , Zhang Wei Fang , Yang Ming Yuan
Published: September 2011

This article describes an experimental setup to measure the TCC between interfaces of two contact solid materials. A new kind of design scheme of the compensation heater is put forward. An experimental investigation of thermal contact conductance is conducted with pressed pairs of GH4169 and K417 contacts in the range 130~280°C. The results show that TCC over this condition increases with temperature, but it is not monotonic. Moreover, the thermal contact conductance measured by experiment with compensation heater at the interface is higher than that without compensation heater.
Study on Mainstream Smoke Characteristics and their Risks of Low Ignite Propensity Cigarettes
Authors: Qiu Ye , Wang Jian , Liu Jing
Published: September 2011

To learn differences and mainstream smoke (MSS) risks of between Low ignite propensity (LIP) cigarettes and the common, their MSS and 7 main harmful compounds in MSS are analyzed, and their MSS risks are also evaluated. The results indicate that: (1) It will improve yields of tar, nicotine, HCN and other main harmful compounds in MSS of the cigarette rolled with LIP cigarette paper replaced of common cigarette paper, and lead risks of their MSS to increase; (2) It is a way to reduce yields of some main harmful compounds and lower risks of their MSS risks of LIP cigarette paper with higher diffusion rate of flame retardant bar or higher original porosity; (3) The LIP cigarette paper produced by hemp pulp rather than wood pulp can also reduce appropriately yields of NH3, CO and other harmful compounds and lower their MSS risks of the LIP cigarettes.
Fatigue Prediction for Pump End of High Pressure Fracturing Pump
Authors: He Xia , Liu Qing You , Zhao Min , Zhao Yong , Tian Jia Yu
Published: September 2011

The unexpected in-service failure of fluid pump end of fracturing pump motivated the present investigation. The model of three-cylinder single-action fluid pump end had been established by using the Pro/E software for improving the level of fracturing pump design. The combined use of fracture mechanics concepts as well as the finite element method demonstrated that local failure was due to the specific intersection region between plunger-chamber and cylinder-cavity. The predicted fatigue lives based on the FE stress analysis agree well with the application observations.
Effects of Oxide Powders and Nanocrystalline Particles on the Sintering of Al2O3 Glass-Ceramics
Authors: Jiang Chao Ping , Xing Ya Zhe , Hao Jian Min
Published: September 2011

The effects of CuO, TiO2 and B2O3 oxides and nanocrystalline Al2O3+ TiO2 particles on the sintering of Al2O3 glass-ceramics were investigated by X-ray diffraction and scanning electron microscopy. The CuO and TiO2 oxides can effectively facilitate the formation of CuO–Al2O3–TiO2 glass ceramic. The CuO, TiO2 and Al2O3 oxides can form the new phase Cu2Ti4O and CuAl2O4. They wrapped the Al2O3 grains tightly, so the density ceramic was fabricated successfully sintered at 1300°C. Analyzing the fracture surface morphology, the ceramic added CuO, TiO2 oxides shows the mixed mode of intergranular and transgranular fracture. However, after added B2O3 oxides the B2O3-CuO–Al2O3–TiO2 glass ceramic shows the mode of intergranular fracture. The ceramic added nanocrystalline Al2O3 + TiO2 was more density and fine organization. The fracture mode is as same as the ceramic added CuO, TiO2 oxides.
A Flow Path Generation Approach of Hydraulic Manifold Blocks Based on Maze and Genetic Algorithms
Authors: Li Guang , Niu Wen Tie , Zhang Da Wei , Gao Wei Guo
Published: September 2011

The automatic generation of flow path is the key and most difficult task in Hydraulic Manifold Blocks (HMB) design. This paper divides the HMB layout space into grids, and sets the HMB boundaries and existing flow paths to obstacles, and the paths generated using maze algorithm are regarded as the initial population of genetic algorithm. The optimal path with the shortest path and least turnings can be obtained using genetic algorithm. The ports of flow path can be connected after the generation of technical holes based on the blind holes. The design parameters of holes, such as starting point coordinates, orientations and depths, can be obtained through a series of algorithms, and then drive the secondary development system HMBDesigner based on SolidWorks to generate three-dimensional solid model. This paper also discusses the generation method of multi-port flow path and multiple flow paths.
Mechanical Properties of Nb2O5-Al2O3 Ceramics Prepared by Microwave Sintering
Authors: Ai Yun Long , He Fei , Liang Bing Liang , He Wen , Chen Wei Hua
Published: September 2011

The influence of Nb2O5 on the phase and microstructure evaluation and mechanical properties of Nb2O5-Al2O3 ceramics sintered with 2.45 GHz microwave energy was investigated. The results showed that Nb2O5 could densify the pure alumina with a lower sintering temperature and a short sintering time. Nb2O5 reacted with Al2O3 to form AlNbO4 completely and the amount of AlNbO4 increased with the increasing content of Nb2O5, distributing at the Al2O3 grain boundaries. The specimen doped with 10 vol.% Nb2O5 sintered at 1500 °C exhibited plenty of columnar grains with draw ratio about 1:3. The existence of columnar grains enhanced the microhardness and fracture toughness of Nb2O5-Al2O3 ceramics.
Application of Chinese Lacquer Art in New Cultural Furniture Design
Authors: Chen Yu Shu
Published: September 2011

This paper is intended to explore a new method which the tradional lacuqer art is applied in contemporary furniture. The new furniture is called as new cultural furniture. It is full of the sense of the times as well as the Eastern taste. By practicing, the three principles, which infuse the lacquer art with a new life, are concluded. They are the modular design of the lacquer decoration, the modernization of techniques, and the judicious choice of patterns and images in accordance with the taste of the times.
Story of Chairs — Design Innovation Thoughts Derived by Function Extension Method
Authors: Hu Xin Ming
Published: September 2011

Taking chairs for example, this article elaborates the difference and relationship between habitual thoughts and extended thoughts. The former is only thinking about “sitting”, while the later is emphasized on getting transcendent based on revealing main functions of chairs. It also exploits their other existing forms besides “sitting”. The final purpose is researching on the integration of main and additional functions of chairs effectively , so as to realize the differentiation and diversification of design innovation based on the homogenization of main functions.
Enterprise Resource Planning (ERP) Implementation Process: Project Management Perspective
Authors: Chofreh Abdoulmohammad Gholamzadeh , Goni Feybi Ariani , Jofreh Mahdieh Gholamzadeh
Published: September 2011

Enterprise Resource Planning (ERP) system is an advanced manufacturing system that enables the integration of transactions-oriented data and business functions throughout an enterprise. ERP system holds the potential of greatly enhancing organizational performance and establishing competitive advantage. ERP project team can reduce their implementation costs by having a well thought out ERP implementation process. This research examines the ERP implementation process from the project management based perspective. The theoretical framework is developed to specify the ERP implementation process, which is categorized into five phases in project life cycle: initiating, planning, executing, controlling and closing. The research adopts the iterative triangulation as a methodology to establish this study, and one large company in Iran has been chosen by researchers to examine the proposed framework.