bluuebunny/crossref_metadata_2025 huggingface dataset:
Influence of Rotary Forging Process on Microstructure and Properties of Niobium-Titanium Alloy
Authors: Han Jing Tao , Liu Jing , Zhou Xiao
Published: June 2014

High conductive Niobium-Titanium alloy has the advantages of good corrosion resistance, high specific strength, good thermal stability, etc. The rotary forging technology of Nb-Ti alloy ingot with type prepared by vacuum smelting method was studied. The results show that coarse and homogeneous casting-microstructure becomes strip deformation microstructure after rotary forging. With the increase of deformation degree and deformation velocity, the space of strip deformation microstructure decreases and yield strength of alloy increases. Nb-Ti alloy bar after deformation is still type alloy with a thermal stability.
Key Technical Analysis of Roll Forming for High Strength Rectangular Tube
Authors: Peng Xue Feng , Han Jing Tao , Liu Jing , Li Dan Yang , Yan Pei Jie
Published: June 2014

Using advanced high strength steel (AHSS) instead of traditional mild steel is the development trend of automotive lightweight. Rectangular tube, as an important component of the vehicle, its forming principle and technology analysis is particularly important. Combining the practice production in this paper, the basic principles of circle-to-rectangular forming (CRF) and strip-to-rectangular forming (SRF) process are analyzed. ABAQUS software and PROFIL of roll pass-aided design software are used to analyze the characteristic of two roll forming processes in terms of residual stress, dimensional accuracy of the pre-punched holes and weldability. The study shows SRF process is more suitable for AHSS than CRF process.
Research Status of Sheet Metal Blanking Processes
Authors: Liu Qian , Han Jing Tao , Liu Jing , Wang Xiao Xiong
Published: June 2014

Metal blanking is a widely used process in high volume production of sheet metal components. The main objective of this paper is to provide an overview of the state of the several blanking processes including conventional blanking, fineblanking and rotary blanking from both experimental research and finite element analysis. This paper also includes the blanking mechanicals.
Study on Simulation and Experiment of Micro Sheet Metal Forming
Authors: Zhao Yue , Luo Liang , Jiang Zheng Yi , Zhao Xiao Ming , Wu Di
Published: June 2014

In the last few decades, there is a global interest in micro products, and micro forming of metals is a promising micro manufacturing method. However, a comprehensive understanding of this process is absent. Therefore, this study aims to investigate micro deep drawing process via experimental and analysis work. Simulation results are in good agreement with the experimental data. The comparison between the finite element method (FEM) simulation and experimental results shows the feasibility of FEM simulation for micro deep drawing process. This research also lays a fundament of investigating micro forming process, especially micro deep drawing.
Manufacturing Process for Bush Type Bearing Metal Using Centrifugal Casting
Authors: Choi Won Sik , Sin Mi Jung , Choi Sun Mi , Lee Chang Ju , Kim Min Kue , Chung Sung Won , Park Jong Min , Kwon Soon Goo , Kwon Soon Hong , Kim Jong Sun , Kim Chung Gu
Published: June 2014

This paper regard the development for bush type bear metal using centrifugal casting by changing the rpm, amount of melting metal bush type bearing metal process was fixed also bush type bearing casting is possible by using centrifugal casting machine, bonding test results meet the specification and results of non-destructive testing meet the inspection.
Oxidation Behavior of T91 Steel in Water Vapor Atmosphere at 750°C
Authors: Liu Guang Ming , Wang Cai Fu , Liu Gang , Liu Zhi Lei , Tian Ji Hong
Published: June 2014

The oxidation behavior of T91 steel in Ar-10%H2O atmosphere at 750°C was investigated. The morphology, microstructures and composition of oxide scales were examined by SEM/EDS and XRD. The results showed that the oxidation kinetics followed logarithmic law in the initial stage and parabolic law in the latter stage. At the early stage Cr-rich oxide film formed on the sample surface, which led to slow mass gain stage. In the latter oxidation stage, Fe ions diffused outward, resulting in fast oxidation stage. The oxidation scales consisted of two layers, an porous Fe2O3outer layer and an denser Cr-rich inner layer. Some cracks were formed between the inner and outer layers. The oxidation mechanism of T91 in water-vapor atmosphere at high temperature was discussed in brief.
The Evaluation of the up and down Milling Based on its Chip
Authors: Zajac Jozef , Fečová Veronika , Michalik Peter , Kočiško Marek , Zajac Jan , Berthoty Jozef
Published: June 2014

The main aim of this contribution was monitoring of chip in the milling process by the evaluation of the volumetric coefficient of chip. The chip was monitoring during the peripheral up and down milling. Nowadays, the milling is the most used technology in engineering. The shape of chip is important for its transport and for economical aspect of this technology. This coefficient represents the shape of chip. The small chip has a lower volumetric coefficient, but the very small chip is not very desired in the cutting process, because they can fill some small spaces and damage the machine. But very long chip can damage tool and machine, too.
Study on Material Removal Mechanisms of Surface Fatigue Layer Based on Handheld High Velocity Arc Machining
Authors: Tang Xiu Jian , Wu Zhi Yuan , Ge Hui , Yang Jun Wei , Xu Wen Jing , Gao Qiang
Published: June 2014

The surface fatigue layers made of Cr12 were machined by the handheld high velocity arc machining equipment, the machined surface was observed by SEM, and the material removal mechanisms was studied. The results show that the material removal mechanisms of handheld high velocity arc machining is based on lots of the pulse discharge processes, and every pulse discharge process contains five sub-processes, which is similar with the material removal mechanisms of EDM. However, the discharge gap for handheld high velocity arc machining is at the range of arc discharge gap, which is longer than that of EDM.
Experimental Study on the Optimization of Ti1023 Milling Parameters
Authors: Chen Ming Hua , Yang Hou Chuan , Du Xiao Wei , Yang Bao Sheng
Published: June 2014

Titanium alloy Ti-1023 is difficult to machine because of its high strength, chemical reactivity and low thermal conductivity. And it have tool wear and chipping due to its poor machinability. The relationship between milling force, tool life and milling parameters by adopting single-factor experimentation method is studied, The optimized milling parameters are selected, and processing efficiency is improved. The result shows: The appropriate cutting parameters of Titanium alloy Ti1023 are cutting speedVc=15~20m/min, feed per toothfz=0.12~0.18mm, depth of cut (DOC)ap=4~7mm; Besides, when the unit positive pressure of the cutting edge surpasses 320N, chipping is likely to happen on the blade.
Study on the Thermal Expansion Displacement during Spot Welding Depending on the Multi-Physical Coupling Finite Element Model
Authors: Liang Cai Ping , Li Yong Bing
Published: June 2014

An incremental and thermal electro-mechanical coupled finite element model has been presented in this study for predicting spot nugget size, gap between workpieces, and thermal expansion displacement during spot welding process. Approximate temperature dependent material properties, including physical and mechanical properties, have been considered. The spot nugget shape and the thermal expansion displacement were obtained by simulation. The solutions showed that the displacement of workpieces was directly related to the quality of solder joints and can be as a monitoring parameter of spot weld quality. These calculations provide a theoretical reference for nugget quality monitoring and forecasting by electrode expansion displacements.
Study of End Cracking during One-Sided Submerged Arc Welding with Flux-Copper Backing
Authors: Wang Xing Chun , Lu Feng Gui , Andersen Isak , Yu Long Seng
Published: June 2014

Longitudinal hot tearing, popularly called as end cracking, frequently takes place in the end portions of large steel panels’ butt joints, using one-sided, submerged-arc welding with flux copper backing welding process (FCB welding). The study was to look for the possibility to improve and/or prevent the end cracking issue during FCB welding, center blind-hole drilling technique was used to measure the welding residual stress for five different cases, considering hot tearing mechanism, its influence factors and the relevant reported prevention measures. Unpredictable result was observed subsequently that transverse compressive stress is found on the shallow surface of weld seams, which could give supplementary information to the common assumption for conventional low heat input welding method that cracks initiation is caused by tensile stresses across the welded joints. The study concluded that FCB welding end cracking issue is caused by the comprehensive function of different stresses, and also properly use tack welding practice, suitable elastic run-off plate and relatively low heat input energy which will reduce the end cracking susceptibility for the tested materials.
Influence of Heat Treatment on Microhardness and Microstructure of the Joining Interface for Ti-24Al-15Nb-1.5Mo/TC11
Authors: Liu Ying Ying , Lin Xin , Zhang Wen Xin , Zhang Yuan Bo
Published: June 2014

The microhardness and microstructure of Ti-24Al-15Nb-1.5Mo/TC11 dual alloy joining interface processed by different heat treatment regimes were investigated. The results show that the microhardness of the weld zone and Ti-24Al-15Nb-1.5Mo alloy side of the dual alloy processed by gradient heat treatment are higher than that of the specimen processed by balance heat treatment. Moreover, the microstructure differences between the specimens processed by gradient heat treatment and balance heat treatment are very obvious, particularly in the interface between the TC11 alloy and the weld zone. While the joining interface is processed by gradient heat treatment, the microstructure change homogeneously, and the demarcation lines are ambiguous. However, for the joining interface processed by balance heat treatment, the demarcation lines are very obvious, and the microstructure of the TC11 alloy side is bi-morphic, the lath is short and coarse. Therefore, the interface integrity of the dual alloy processed by gradient heat treatment is better, which is an adoptable method to improve the properties of the dissimilar alloy joining interface.
Analysis on Alloying Elements of Selective Oxidation of TRIP Steel
Authors: Teng Hua Xiang , Wang Hai Quan , Liu Guang Hui , Jiang Guang Rui , Liu Li Bin , Kang Yong Lin
Published: June 2014

Two kinds of TRIP steel with different Al and Si content were researched in this article. Different annealing atmosphere in the trial was achieved by the Hot Dip Galvanized Simulator by Iwatani. The segregation of alloying elements after annealing under different atmosphere were investigated and the compounds on the surface were shown. Furhermore, the distribution of oxides was abserved on the surface and the reactive wetting was assessed and the results after galvanizing was provided. We found out the increasing wettability was abserved under more reducing atmosphere with less Si because of a decrease oxide amount and an increase internal oxidation.
Weld-Bonded Joints Properties with Advanced High Strength Steel DP600
Authors: Dang Wei Dong , Jousset Pierre , Rachik Mohamed
Published: June 2014

In this paper, structural adhesive SikaPower-498 is associated with spot welds to produce weld bonded joint with KS2 specimens. The specimens are tested under tension, shear and peeling loading. Weld bonded joint ultimate strength and energy absorption are compared with single spot welded joints and adhesively bonded joints tests. In order to investigate the facture mechanism of weld bonded joint, optical microscopy and scanning electronic microscopy are used to check the material structure and the facture surfaces respectively. Weld bonded joints show the highest ultimate strength and energy absorption under tension and peeling test among the three tests while it has intermediate ultimate strength and the lowest energy absorption under shear. Fracture analysis shows that spot welds fail in ductile fracture. The results can be used to design weld bonded joint in car body-in-white and to calibrate modeling parameters for weld bonded joint modeling in finite element calculations.
Sealing of Sapphire Infrared Windows by Ultrasonic Interfacial Deposition Soldering
Authors: Liu Sen , Wang Zhi Peng , Cui Wei , Dai Yan , Li Dan Dan
Published: June 2014

Sapphire/metal soldering joints are widely needed in various optical instruments. Traditional soldering methods are expensive and time consuming, because they usually involve a sapphire surface metallization procedure and a vacuum soldering procedure. In this study, we sealed infrared sapphire windows using a novel ultrasonic soldering method in the ambient atmosphere, with Sn-Zn-Al alloy as the solder. The wetting and bonding at the sapphire/solder and solder/metal-tube interfaces were realized by ultrasound. The microstructure of the joints was revealed by means of scanning electron microscope (SEM). The gas impermeability of the samples was investigated. This new method is very simple and cost-saving. The reliability of the samples made by this new method is equal to that made by traditional method. This is the first application of the ultrasonic interfacial deposition brazing and soldering (UIDBS) method to a practical device. We hope this method to be applied to other optical devices.
Characteristics Evaluation of Weld and Deposited Metal Zones in the Case of Welded with Inconel 718 Filler Metal to Cast Steel for Piston Crown Material
Authors: Moon Kyung Man , Won Jong Pil , Park Dong Hyun , Kim Yun Hae , Jeong Jae Hyun , Baek Tae Sil , Seo Chun Taek
Published: June 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 enginet 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, Inconel 718 filler metal were welded with GTAW method in the cast steel which would be generally used with piston crown material. In this case, the mechanical and corrosion properties between weld metal zone (WM) welded to the groove which were artificially made in the base metal and deposited metal zone (DM) only welded on the surface of the base metal by Inconel 718 filler metal were investigated using electrochemical methods, such as measurement of corrosion potential, anodic polarization curves, cyclic voltammogram and impedance etc. in 35% H2SO4 solution. The deposited metal zone exhibited a lower value of hardness compared to the weld metal zone. Moreover, the corrosion current density also indicated significantly a lower value in the deposited metal zone compared to the weld metal zone, showing a nobler corrosion potential than the weld metal zone. The corrosive products was not observed both in the weld and deposited metal zones. The microstructure of the pearlite with black color was hardly observed in the weld metal zone, while, the microstructure of ferrite with white color indicated nearly mostly in the weld metal zone. However, ferrite microstructure considerably appeared in the deposited metal zone with crystal pattern, and pearlite microstructure was more or less observed in the deposited metal zone. In particular, the polarization characteristics such as impedance, polarization curve and cyclic voltammogram associated with corrosion resistance property were well in good agreement with each other.
Experimental Research of Hydrogenous Fuel Production from Biogas for Usage in Fuel Cells of Autonomous Power Supply Systems
Authors: Zubkova Marina Yu. , Maslikov Vladimir I. , Molodtsov Dmitry V. , Chusov Alexander N.
Published: June 2014

Possibility of creation of systems of power supply for autonomous consumers based on the new hydrogen technologies using local waste as an energy resource is shown. Amount of consumed gas for production 1 Cl of electricity at supply of hydrogen obtained by electrolysis and hydrogen-containing mixture with the residual content of methane at an identical oxidizer and pressure of fuel supply are commensurable. The possibility of effective operation of a fuel cell module on hydrogen-containing fuel (received from biogas) with the residual content of methane and the possibility of reach modes of effective use of fuel were confirmed. The consumption mixture with residual methane (2% vol.) is comparable (within 5%) with the required amount of hydrogen produced by electrolysis to generate the identical power at a predetermined time interval. The use of relatively cheap hydrogen-fuel derived from biogas from local secondary renewable resources can contribute to the creation of autonomous economical systems of power supply.
Preparation and Characterization of Iron-Oxide-Coated-Zeolite Adsorbent
Authors: Zhu Li , Lu Yan Qin , He Zhao Ju
Published: June 2014

In this paper, Iron-Oxide-Coated-Zeolite has been prepared by using natural zeolite and ferric nitrate. The morphology and structure of the adsorbent were Characterized by Scanning electron microscopy (SEM), powder X-ray diffraction (XRD), and Fourier transform infrared spectrometer (FTIR). The results show that the adsorption properties of zeolite were improved by modified with ferric nitrate. The phosphorus removal rate on IOCZ50was above 80%.
Contrast Prediction for Laser Direct Part Marked Data Matrix Symbols on Titanium Alloy Substrates
Authors: Li Chun Ling
Published: June 2014

To establish a mathematical relationship between Nd:YAG laser parameters and the qualities of laser direct marked Data Matrix symbols on titanium alloys, multiple linear regression analyses were performed based on orthogonal experiment results. According to the analysis results, the paper developed a prediction model to estimate the contrasts of laser direct marked Data Matrix symbols (i.e. Symbol Contrast). The prediction model was statistically analyzed by regression analysis and multi-factor analysis of variance (ANOVA). The predicted symbol contrasts were compared with the experimental values and they were close. The multiple linear regression analyses results showed that the developed prediction model was extremely significant and could be used to estimate the symbol contrast in laser direct part marking.
Thin Wall Formed by Multi-Layer Overlapping Laser Cladding Forming
Authors: Huang Feng Xiao , Yang Zhao Hai , Jin Da Wei , Qin Lin Jing , Liu Jin Gang , Jiang Zhong Hao
Published: June 2014

Thin wall was formed by multi-layer overlapping laser cladding. The results showed that the surface of thin wall presents granular. Laser remelting could obviously improve the surface finish of the thin wall because of the melt of small granules. Match between the laser beam and the powder stream is very important and directly affects the forming quality. The microstructure of the thin wall presented obviously and continuously grown dendrite. Individual layers form metallurgic bonding and ensure whole properties of the cladding thin wall.
Laser-Energy-Density Dependent Formation of Al2O3-TiC Coating by Laser-Assisted Combustion
Authors: Lu Cai Xuan , Li He Ping , Chen Peng , Yan You Wei
Published: June 2014

Al2O3-TiC composite ceramic coatings were obtained by laser-assisted combustion. Al-TiO2-C precursor powder mixture was coated on a medium-carbon steel substrate. When a laser scanned on the powder mixture, it went through combustion synthesis reaction triggered by the incident laser beam and formed the target products. The microstructure of the obtained coatings with different laser processing parameters was characterized using field emission scanning electron microscopy. The laser energy density, controlled by changing laser power and laser scanning speed, was found to play an important role on the microstructure of the products. The formation mechanism of different micro-morphologies with different laser energy densities was proposed according to thermodynamic calculation.
SLC Technologies for Ferroalloy Part Surface Modification
Authors: Liu Jie
Published: June 2014

Experiments on selective laser sintering of iron based alloy and nano-Al2O3 ceramic bulk materials are carried out and effect of sintering parameters on the process is analyzed systematically. A reasonable selective laser sintering technique which can be used to fabricate parts with free shape is obtained and verified with a multilayer sintering experiment. The component and the microstructure of the sintering production is tested. The influences of parameters and the amount of nano-Al2O3 on microstructure and microhardness of the sintering parts are studied. Laser sintering iron-based alloy experiments show that: microhardness has been noticeably improved. It is indicated that with the selective laser sintering technique obtained above, nano-alumina can be processed to manufacture three-dimension parts with free shape. With the addition of Al2O3 and the increase of composite parts of the grain gradually thinning, microhardness gradually improved nanocomposite parts for the microstructure of the dendrite skeleton-shaped crystal and the plane together, the internal Al2O3 dispersion organizations to strengthen the implicit crystal martensite and ferrite mixed organizations.
Formation of TiC0.3N0.7/TiN Composite Film on Ti-6Al-4V Alloy by YAG Laser Irradiation
Authors: Zeng Xian , Yamaguchi Tomiko , Ida Yutaka , Nishio Kazumasa
Published: June 2014

TiC0.3N0.7/TiN composite film was successfully formed on the surface of Ti-6Al-4V alloy by the treatment of YAG laser irradiation. In this paper an influence of laser output power on microstructure, chemical composition, element distribution and hardness, which were separately analyzed by scanning electron microscope (SEM), X-ray diffraction (XRD), electron probe micro-analyzer (EPMA) and nanoindentation hardness test, was investigated. Results showed that cross-section microstructure as-observed near the surface can be divided into three areas which were TiC0.3N0.7/TiN composite film, acicular structure and coarsening area, respectively. With increasing the output power, the thickness and the hardness of the TiC0.3N0.7/TiN layer were significantly improved.
Experimental Study on Refractory Weathering Steel Cold-Rolled Sheets Recrystallization Annealing
Authors: Yao De Ming , Zhang Yong Jun , Han Jing Tao , Chen Man Ying
Published: June 2014

In refractory weathering steel cold-rolled sheet production process, the grains are elongated along the rolling direction, which will lead to the change of mechanical properties of sheets. Recrystallization annealing is an important process in the production of cold-rolled sheets. Therefore, research on recrystallization temperature and determining the recrystallization annealing time are important for the production of cold-rolled sheets. By measuring the hardness at different annealing temperatures and metallographic structure observation, obtained the refractory weathering steel of reduction rate of 66.7% recrystallization temperature is 650°C; By measuring the temperature of 700°C hardness under different annealing time and metallographic structure analysis, when recrystallization annealing time is 1 hour plasticity and strength of cold rolled sheet fits well, with excellent comprehensive mechanical properties.
Modeling and Identification of Geometric Error Based on Screw Theory
Authors: Zhao Guo Juan , Zhang Lei , Ji Shi Jun , Wang Xin
Published: June 2014

In this paper, a new method is presented for the identification of machine tool component errors. Firstly, the Non-Uniform Rational B-spline (NURBS) is established to represent the geometric component errors. The individual geometric errors of the motion parts are measured by laser interferometer. Then, the volumetric error for a machine tool with three motion parts is modeled based on the screw theory. Finally, the simulations and experiments are conducted to confirm the validity of the proposed method.
Measurement Uncertainty Evaluation of a Virtual Instrument for Thickness Monitoring of Brush-Plated Coating
Authors: Jing Xue Dong , Xu Bing Shi
Published: June 2014

A virtual instrument (VI) for measuring the coating thickness of brushplating has been developed; and then the analysis of the main uncertainty sources of the instrument has been presented, including the uncertainties of the transducer, the A/D convertor, and the DSP. Moreover the combined measurement uncertainties of theese four bocks have been estimated respectively according to Type B evaluation of “guide to the expression of uncertainty in measurement (GUM)”[1] in terms of Gram-Chariler series, while their corresponding relative measurement uncertainties have also been given. Finally, the overall relative uncertainty and the combined uncertainty of the instrument have also been provided.
Simulation Analysis and Experimental Study of Initial Permeability Testing Technology
Authors: Guo Feng , Ren Shang Kun
Published: June 2014

With the initial permeability testing technique, early evaluation on stress concentration and fatigue damage can be realized by measuring initial permeability of the ferromagnetic material. The variation of detection signals with initial permeability is researched via the ANSYS FEM simulation and the tensile testing of 45 steel. The results indicate that the detection signals have a linear relation with initial permeability of the ferromagnetic material. It is seen that initial permeability testing technology can give effective and accurate evaluation of the ferromagnetic material.
The Study of Closed-Loop Position Control System Based on CNC Processing
Authors: Zhou Xin
Published: June 2014

In view of the existing problems of indirect position closed-loop control, a digitized closed-loop control method is presented and a new kind of position control system with fully digitized closed-loop based on that method is developed. In this way, the fully digitized control of cutter trajectory is implemented with the features of digitized driving, digitized measuring and digitized position control, so that the machining accuracy of the NC machine tools is effectively assured. This system has been used on varieties of NC machine tools and very good results have been obtained in the machining of complex precision parts.
Influences of Edge Rolling on Unsteady Deformation of Metal in Roughing Stage of Continuous Hot Strip Rolling
Authors: Ren Rui , Zhang Xiao Ping , Chen Xi
Published: June 2014

Edge rolling in roughing area of continuous hot strip rolling is a basic method of controlling slab width. Edge rolling will induce dog-bone, width loss and fish tail at head and tail ends of slabs in unsteady deformation zone. A 3D elastic-plastic FEM model for roughing stage of continuous hot strip rolling was established and research on the influences of those technical parameters such as slab width, thickness and reduction of edging roll on unsteady deformation of metal was carried out. The research work provides a scientific basis for the optimization of edge rolling schedule.
Analysis of Boride Phase Composition in High Boron Alloyed Stainless Steel Containing Titanium
Authors: Yuan Lin Lin , Han Jing Tao , Liu Jing
Published: June 2014

Hard and brittle (Fe,Cr)2B phase caused by excess boron in high boron alloyed stainless steel has adverse effects on the hot working performance and mechanical properties of material. Adding Ti into high boron alloyed stainless steel can improve the type, morphology and distribution of boride phase. The results show that TiB2 phase with petals or small block shape forms after adding Ti into high boron alloyed stainless steel, and as the increase of Ti content, TiB2 phase replaces (Fe, Cr)2B gradually. Moreover, the petal-like TiB2 phase becomes smaller and more granular after high temperature deformation, and the segregation of matrix composition is significantly weakened by the formation of TiB2 phase.
Application of Two Damage Identification Methods Based on Sensitivity Analysis in Steel Structure
Authors: Wang Yu Ying , Sun Wen Xiu
Published: June 2014

Structure damage identification is a hot research area internationally in recent years. Two damage identification methods based on sensitivity analysis are concluded. A three-tier steel frame structure model is established through utilizing ANSYS10.0, the software of finite element analysis. Through modal analysis of finite element, the frequency and formation before and after damage are obtained. The position of damage of the model is fixed by applying two damage indexes. It is indicated from the results that these two methods are effective for damage identification of the space structure of steel frame.
Analysis of an Orbital Grinding System for Grinding Crankshafts for Large Ship Engines
Authors: Jang Joon , Bang Han Seok , Choi Woo Chun , Cho Chang Rae , Cho Soon Joo
Published: June 2014

A crankshaft is the most critical component, and it can dominate the life of the engine. Nowadays an orbital grinding is widely used to grind a crankshaft. In this study, static analysis is done to find deformation of an orbital grinding system due to weight, modal analysis is done to obtain the natural frequencies, and harmonic analysis is done to investigate the compliance. It is found that all the results show that first frequencies are found to be near 70-80Hz. The machine will be weak to vibration near 70-80Hz. It is also found that the peak value of x compliance is smaller than that for other axes, and grinding in the x direction will be more stable than grinding in other direction.
Numerical Simulation and Process Analysis for Injection Forming about the Thin-Wall Conical Centrifugal Disc
Authors: Zhou Jian Hua , Liu Li Guo , He Xue Ming
Published: June 2014

A numerical simulation mathematical model and sloved method about injection forming for thin-wall part was established. Based on it, Simulation of the injection forming process of centrifugal separation disc. Through the simulation of forming process for PA66 and PA66+30%GF two kinds of materials, realized the injection forming for centrifugal separation disc using PA66+30%GF. Through the anisotropy of glass fiber orientation, improve the stiffness and toughness for centrifugal disc.
Numerical Simulation of Liner Curvature Radius on Formation of LEFP
Authors: Gou Rui Jun
Published: June 2014

In order to obtain a linear explosively formed projectile (LEFP) with a good flying form under large stand-off, the LS-Dyna finite element analysis software and arbitrary Lagrangian - Eulerian (ALE) algorithm were used to simulate the forming process of LEFP with a 30mm charge structure diameter. On the basis of that, the only changed factor was the curvature radius of the liner which was selected as 0.65D, 0.75D, 0.85D, 1.0D and 1.1D for the simulation of LEFP forming progress. The warhead speed-time curves and fracture surfaces of the LEFP are analyzed, with liner radius decreasing, the projectiles become more slender, and instead, the larger radius liner forms flat and wide LEFP. Slender LEFP is conductive to penetration, however the over small radius which cause the reduction of weight and kinetic energy makes fracture easily, oversize radius influence either end of LEFP that warps upward seriously , what means speed grads of both ends differ greatly .The suitable radius ranges from 0.75D to 1.0D.
Study on Transverse Uniformity of Phase Transformation for Hot-Rolled Strip on Run-out-Table
Authors: Wang Dong Cheng , Dong Feng , Liu Hong Min
Published: June 2014

A numerical simulation of phase transformation for hot-rolled strip on run-out-table are introduced in the present work combined with experiment. Continuous-cooling-transformation (CCT) diagram are used to regress the transformation model of Q345B. Temperature field coupled with phase transformation is analyzed on run-out-table. Evolution of temperature and organization during cooling are analyzed for the hot-rolled strip between the last stand of finishing mill and coiling. It is concluded that the transverse temperature has significant effect on the uniformity of phase transformation.
A Numerical Approach for Simulating a Self-Contacted Elastic Rod
Authors: Wang Gong Xi , Zhao Wei Jia
Published: June 2014

A challenging problem in the numerical simulation of a self-contacted elastic rod is the change of topological structure during the contacting process. In this article, a numerical approach is introduced to simulate a self-contacted Cosserat rod. By introducing the angular velocity and Euler parameters as the state variables, an improved Lagrange equation is introduced. A finite element method is built to deal with the simplified model, and numerical examples are given.
A Schwarz Alternating Algorithm Using Elliptical Arc Artificial Boundary for Exterior Problems with a Concave Angle
Authors: Chen Ya Jun , Du Qi Kui
Published: June 2014

In this paper, a Schwarz alternating algorithm using elliptical arc artificial boundary for boundary value problem of Poisson equation in an infinite domain with a concave angle is investigated. The convergence of this algorithm is given. The convergence rate is analyzed in details for a typical domain. Finally, some numerical examples are presented to show effectiveness of our method.
Material Removal Model and Experimental Analysis in the CMP of Si-Based Fiber Array
Authors: Hu Qing , Liu De Fu , Zou Wen Bing
Published: June 2014

Based on statistics theory and contact theory, a material removal model for predicting polishing quality in chemical-mechanical polishing (CMP) of multi-material surface is developed. The contacts of pad-workpiece and pad-particle-workpiece are characterized by the elastic–plastic contact mechanism. The material removal is considered to be the sum of the contributions from two movement modes of particles. Within the model, linear material removal volume (LMRV) can be determined as a function of the interactions of workpiece, pad and slurry. The model also determines the relationship between LMRV and roughness. It is found that polishing pad and parameters of polishing conditions have significant effects on the polishing quality. The experimental results show that chemical reagents contribute quite differently to multi-material end-face planarization. The proposed model reveals insights into improvement of the polishing quality of multi-material surface such as fiber array end-face.
Research on FEM Simulation of Splitting Spinning Progress about 2024 Aluminum Alloy
Authors: Li Lin Lin , Cai Zhong Yi , Xu Heng Qiu , Wang Da Li , Hou Feng Yan , Huang Tao , Lu Bo , Li Yi Nan , Guo Ya Ming
Published: June 2014

Splitting spinning is a special spinning processing method which is different from the common spinning and powerful spinning. According to the forming step can be divided into splitting process and shaping process. It analyzed splitting spinning process of deformation behavior by the elastic plastic finite element method of 2024 aluminum alloy, it determined the largest area of deformation and stress concentration region in the deformation process of the deformation, at the same time, it proposed the adaptive grid technique in splitting spinning simulation process, and selected quality amplification factor carefully.
Finite Element Simulation of Seven-Hole Propellant Extrusion and the Optimization of Die Compression Ratio
Authors: Ji Dan Dan , Liao Xin
Published: June 2014

FLUENT was used to simulate the propellant flow law in the flow channel of a seven-hole propellant die, and distributions of internal pressure, velocity fields was obtained. The influence of compression ratio, temperature and flow rate was analyzed. The results show that compression ratio influences the pressure and velocity distribution obviously. In addition, flow temperature and inlet rate have a small effect on pressure and velocity distribution.
Numerical Investigation on Angle of Repose of Cylindrical Particles
Authors: Chen Hui , Zhao Xian Qiong , Xiao You Gang , Liu Yi Lun
Published: June 2014

The angle of repose of sand pile compose of cylindrical particles was extensively studied using the discrete element method (DEM). The Multi-element model was selected for representing cylindrical particle and the effects of shape of granular on angle of repose were studied. The results show that the angle of repose of cylindrical particles is obviously larger than that of spherical particles. Meanwhile, the shape factor (length-width ratio) of cylindrical granular has a great influence on the angle of repose of granular system. As studied in this paper, the angle of repose increases with the increasing of length-width ratio. Cautious should be taken when choosing a reasonable particle model for more precise DEM results.
Experimental Research on Crock-Type Metal Fibre Burner of Chinese Cooking Appliance
Authors: Lee Guang Peng , Cui Yong Zhang , Shao Chang Bo
Published: June 2014

Heat efficiency and CO emissions of Crock-type Metal Fibre Burner of Chinese Cooking Appliance were experimentally investigated. Heat efficiency with different factors was analyzed. Primary air coefficient α and port heat intensity q are the most factors. If α or q increases, heat efficiency decreases. The influence of the distance is not significant. CO increases with q increasing and CO decreases with α increasing. Under the rated load, heat efficiency reaches to 48% and CO(α=1)is only 0.004%.
Cooling Rate, Microstructure and Property Studied of Spray Cooling of Heavy Shell Ring Rolling
Authors: Sun Jian Liang , Jiang Zheng Yi , Jia Feng , Zhang Yong Zhen
Published: June 2014

In the present work, detailed studies were made on the transformation characteristics, microstructure and mechanical properties of heavy shell ring (HSR) in the spray cooling process. The spray cooling device of HSR was designed. The 2.25Cr1Mo0.25V steel used in production of HSR for hydrogenation reactor was selected as the testing material. The simulation of spray cooling of HSR was carried out on ABAQUS. The constitutive model and continuous cooling transformation (CCT) diagram of 2.25Cr1Mo0.25V were determined. CCT diagram, metallograph and SEM results show that the bainite forms throughout the cooling rate range from 0.5 to 10 ℃/s, and martensite begins to be produced by increasing the cooling rate higher than 60℃/s; when the cooling rate is 10 ℃/s, with the increase of the deformation degrees, the ferrite grain size becomes small, the yield strength and tensile strength increase, the elongation decrease, So it is good for refining the grain to increase the deformation. The yield strength, tensile strength and elongation were obtained under different cooling technology.
The Transient Temperature Field Simulation and Analysis of Machinery’s Components by ABAQUS
Authors: Sun Jian Xiang , Xu Wei Jiang
Published: June 2014

By using the Abaqus software, FEM calculation of the quenching process of non-standard component which has complex contour has been operated, the temperature field distribution which accompanies the quenching time has been obtained. The simulation process’s precision and efficiency is excellent, this method is applicable to the quenching technics’s improvement, and can offer the calculation basis to the analysis of the thermal stress field and residual stress. It can also provide the improving scheme for the intensity design of the coal winning machinery.
Numerical Simulation Analysis of Rail Head for U75V in the Process of Spray Cooling Temperature Field
Authors: Chen Lin , Li Xiao Na , Duan Jin Liang , Liu Yu Yan
Published: June 2014

In this paper, for the rail U75V rail head spray quenching process temperature field, we founded model, meshed, loaded, and solved the finite element simulation of the process by using ABAQUS finite element analysis software, and carried on the site test using the infrared thermal imager, we received the changing discipline with time of the temperature of rail. The results of simulation are close with actual process. The precise calculation for the future in the process of quenching heat stress and residual stress laid the foundation experiment.
ISO 11439 I-Cylinder Bonfire Test and Safety Evaluation
Authors: Yuan Yi Wen , Xu Wei Pu
Published: June 2014

This paper investigated the performance of ISO11439 standard I-Cylinder under fire condition via both numerical simulation and experimental methods, and proved the similarity between the two results. The paper also analyzed the material and the metallurgical structure of the invalid tested I-cylinder, indicating that fire would not lead to the material degradation and failure. The overall tests and comparisons led to the conclusion that I-cylinder explosion under fire condition is most likely caused by the material flaws or other safety defects of the cylinder, and not the fire. The cylinder manufacturing be suggested to regulate more strictly and properly.
Study on Microstructure of Continuous Cf/Al Composite Material Prepared by Hot Pressing Diffusion Method
Authors: Lu Bai Ping , Liu Xing Feng , Shuai Tian Tian
Published: June 2014

Two-dimensional carbon fiber fabric T300 used as reinforcement, Cf/Al composite material was prepared by hot pressing diffusion. Effect of parameters on microstructure of Cf/Al composite material was studied. We found that for aluminum foil used as matrix, hot pressing temperature is 650°C, hot pressing time is 20min, pressure is 30MPa. As a case, interfacial reaction product Al4C3 accounts for 3.6%, and composite material density is 2.44g/cm3. For aluminum powder used as matrix, hot pressing temperature is 620°C, hot pressing time is 35min, pressure is 10MPa. As a case, Al4C3 accounts for 2.8%, and composite material density is 2.58g/cm3. The molding of aluminum powder is much easier than that of aluminum foil. The latter requires higher hot pressing temperature. Interfacial reaction product Al4C3 increases as increasing of hot pressing temperature and pressure.
Energy Consumption Analysis of Thermal Regeneration of Activated Cokes Loaded with SO2
Authors: Zhao Jian , Song Jia Qiu , Wang Tao , Ma Chun Yuan
Published: June 2014

The energy consumption of thermal generation of activated cokes (ACs) loaded with SO2 was analyzed. The ACs regeneration process can be divided into four stages, and the stage of ACs’ temperature rising from water boiling point to regeneration temperature consumes about 50% or even more energy of the entire process. The ACs’ moisture adsorption ratio or the moisture content might be the critical factor which influences the total energy consumption. Reducing the moisture content of ACs by increasing operation temperature of FGD, choosing a proper regeneration temperature and recycling waste heat to dry ACs would be effective methods to decrease energy consumption of ACs regeneration process.
Thermal Stress Distribution Simulation Analysis for Disc Brake of Heavy Vehicles
Authors: Ze Su Fang
Published: June 2014

Aiming at the phenomenon that a large amount of friction heat produced during braking process has important influence on the contact surface of heavy vehicle, according to the actual size of the friction plate and the static slice, a three-dimensional transient thermal stress field calculation model has established, using multi-physics coupled method of ANSYS in Workbench, after the numerical simulation of disk brake, the transient thermal stress field distribution has revealed in the process of braking friction piece, the results showed that the stress field and temperature field has a significant influence on each other, indicated that between them there is a clear relationship between the couple.
Experimental Study of Fill Body Non-Uniformity for Cut-and-Fill Mining
Authors: Xu Wen Yuan , Guo Li Jie , Yang Xiao Cong , Yang Chao
Published: June 2014

In this paper, for solving the problem of the filling slurry’s segregation which always leads to non-uniform in-situ filling body, an indirect detection method has been developed to test the material components of the backfill based on element conservation principle. Combined with this detection method, an analog simulation flume experiment has been carried out to study the non-uniform characteristic of the backfill. The results show that the strength of the in-situ backfill body with high content cement is in an S-shaped type distribution, whilst the strength of the in-situ backfill body with low content cement is in a linear decreasing distribution. And on the basis of experimental analysis, the strength distribution model of the in-situ backfill body has been built to study a safe and economical backfill design.
Simulation and Analysis of Anti-Explosion Capability for Coal Mine Refuge Chamber
Authors: Zhou Yuan Yuan , Wan Jun Lin , Zhao Ya Wei , Mao Qin Jian
Published: June 2014

Experiment research aiming at the anti-explosion capability of the refuge chamber is a complex work with high costs. By using finite element analysis, however, could avoid this issue and implement the simulation and analysis more effectively. Based on transient dynamics approach, numerical simulation calculation and analysis of the dynamic response of the refuge chamber under the impact caused by gas explosion are presented in this paper. The results indicate that, when the refuge cabin under specified explosion impact wave stress, the maximum stress of the cabin is 370.8MPa,which is under the ultimate strength, and the maximum impact wave deformation of the cabin is 9.43mm, which is under the maximum permissive deformation (20mm), therefore the rigidity and the strength of the cabin both meet the demands. The refuge chamber presented in this paper, which remain the integrity of the cabin and the safety of the structure under specified explosion impact, has good anti-explosion ability, and could implemmet the emergency risk avoiding effectively.
Study on the Mining Induced Stress of Hard Surrounding Rock under Dynamic Pressure
Authors: Liu Ji Ping , Zhan Shao Jian , Guan Yun Peng , Chuan Li Jing , Tang Jun , Wang Hong Wei
Published: June 2014

There is a series of features of the strata-pressure behavior of hard surrounding rock which is affected by dynamic pressure, such as the caving of the roof is difficult, sudden and large-area. In this paper we focus on the mining and support of 14-1103 working face, In view of the problems of the mine such as the roof is hard to caving, the suspension-area is huge and the safe of the working face is under a great threat, theoretical analysis and field monitoring is used in the study of the strata-pressure behavior. The study indicates that the influence of the advance on the surrounding rock stress is in the range of 100m, the scope in which the surrounding rock stress is remarkably affected is 20~30m; the stress of the surrounding rock is more affected in the scope of fault; the growing time of the roof stress is 2~3 days and is much shorter than the time of roadway’s sides which is 5~9 days.
Adsorption of Cu(II) from Aqueous Solution onto Na-Bentonite/Poly AMPS/AA/AM Composite
Authors: Luo Yong An , Chu Shi Chen
Published: June 2014

Na-Bentonite/poly AMPS/AA/AM composite was synthesized by aqueous solution polymerization. Na-Bentonite/poly AMPS/AA/AM composite was used as an adsorbent for the removal of Cu (II) from aqueous solutions. Cu (II) adsorption on the composite was a fast process, that >90% of the adsorption took place within the first 6 min.The composite was characterized by SEM and FTIR spectroscopy. Chelation and ion-exchange coexist during the adsorption process. The adsorption quantity of composite was 85.1mg/g.