bluuebunny/crossref_metadata_2025 huggingface dataset:
Prediction of Quality Index of Injection-Molded Parts by Using Artificial Neural Networks
Authors: Sun Xiao Fang , Zhu Peng Fei , Lu Ying Jun , Pan Hai Tian
Published: July 2011

Based on the deep analysis of injection molding process and factors influenced on the quality of injection-molded parts, and considering of the non-linear, multi-variable coupling of process and the problem of data deficiencies, a feed-forward three-layer neural network was presented to predict the part weight based on the melt temperature, holding pressure and holding time, which is the most important quality index of injection-molded parts. Furthermore, an architecture optimization approach for neural networks was used and the performance of ANN was evaluated and tested by its application to verification tests with process parameters randomly selected which all of them were not used in the network training. Results showed that the ANN predictions yield mean absolute percentage error (MAPE) in the range of 0.1％ and the maximum relative error (MRE) in the range of 0.47％ for the test data set, and which can comparatively accurately reflect the influence relation of the injection process parameters on part’s quality indexs under the circumstance of data deficiencies.
3D Numerical Simulation and Optimization of Processing Parameters in Fine Blanking of Back Plate of Brake
Authors: Zhu Chun Dong , Li Fu Tao , Gu Zhi Qiang
Published: July 2011

Due to the limitation of 2D simulation in fine blanking, finite element software DEFORM-3D was used to simulate the 3D model of Back Plate. In this article the Normalized Cockroft&Latham fracture criterion was chosen to simulate the blanking process. The distribution and developing trend of the hydrostatic stress, equivalent stress in the fine blanking process are predicted. When the die radii are between 0.4mm and 0.6mm, burnished surface improves. It shows that the ideal blanking clearance value is 0.6% of the material thickness. The results indicate that FE numerical simulation could effectively optimize fine blanking process and offer basis for quality improvement.
An Advanced Strip Flatness Forecast and Simulation System for Hot Tandem Mill
Authors: Wang Dong Cheng , Liu Hong Min
Published: July 2011

Taken hot tandem mill as research object, based on complete flatness control theary, in order to improve flatness control technology, an advanced strip flatness forecast and simulation system for hot tandem mill is developed through theoretical analysis, mathematical modeling, computer simulation and industrial validation. The simulation system’s outputs include flatness, on-load roll gap, rolling force distribution, contact pressure between rolls, strip’s temperature evolution, thermal roll shape and roll wear shape, which can be applied to mill type selection, flatness control performance analysis, preset control, roll shape optimization, virtual rolling, and so on. The simulation system can provide research and development platform for flatness control technology’ improvement and independent innovation, and has important significance to improve the flatness control level of hot tandem mill.
Study on Microstructure and Mechanical Properties of Mg9AlZnGdY Magnesium Alloy after T6 in Lost Foam Casting
Authors: Zhao Zhong , Luo Qiang , Fan Zi Tian
Published: July 2011

The microstructures and mechanical properties of Mg9AlZnGdY alloy after T6 heat treatment in lost foam casting (LFC) are compared with that of AZ91D magnesium alloy. The results show that the microstructures of Mg9AlZnGdY alloy after T6 heat treatment consist of the α-Mg solid solution, β-Mg17Al12 precipitation phase, a small amount of rod Al2Y and block Al2Gd phases, which are distributed over grain boundaries of the α-Mg phase. The thermal stability of Al2Y and Al2Gd phases offers the pinning effect on the grain boundary under high temperature, and therefore, the grain boundary sliding is eliminated and the high-temperature strength is increased. After the T6 heat treatment, the tensile strength of Mg9AlZnGdY alloy was 235MPa at room temperature, and 156MPa at 200°C. Compared with that of AZ91D alloy, the tensile strength was increased by 19.3% and 38.1% respectively.
Fabrication of Hierarchical Microporous Structures with Controlled Morphology and Topography
Authors: Li Min , Wang Chao Sheng , Wang Hua Ping
Published: July 2011

Co-continuous polymer blend has attracted broad interest in many technique fields due to its unique ability to be transferred into porous material with interconnected micro-channels. And combined with some surface patterning, it can provide material of hierarchical porous structure. A key challenge in the fabrication of material of desired morphology is the ability to control the interface movement. Here, we incorporate the thermo-geometrically controlled annealing and hot embossing to fabricate hierarchical microporous structures with well defined morphology and topography. Various novel structures demanded for many emerging applications can be created by judiciously using this newly developed technique.
Structure and Properties of TC4 Alloy by Die Forming and Sintering Utilizing Hydrogenated Powder
Authors: Tian Ya Qiang , Hou Hong Liang , Ren Xue Ping
Published: July 2011

The influence of hydrogenation on structure and properties of TC4 alloy by die forming and sintering using hydrogenated powder was researched and the modification mechanism was analyzed by means of the room-temperature die forming and sintering in protection air to produce titanium alloy. The results show that, with the increase of hydrogen content and sintering temperature, the structure of TC4 titanium production using hydrogenated powder by die forming and sintering was changed from Widmanstaten structure to duplex structure. The density of TC4 titanium production shows a rise trend gradually. After annealing, the structure of TC4 titanium production gets more uniformity and refinement obviously, the compress yield limit shows a rising trend gradually, and the hydrogen content of TC4 alloy safety state is achieved. The density and mechanical property of TC4 titanium alloy with hydrogen content of 0.42wt % is the best.
Research on Thermocouple Embedded Position for CC Mould Copper Plate with High Casting Speed
Authors: Sun Li Gen , Zhang Jia Quan
Published: July 2011

High casting speed would increase the occurrence probability of sticking, and make it harder for breakout signals catching. The coupled visco-elasto-plastic FEM models have been presented for thermal process analysis of steel shell and the mould copper plates. With the understanding to the mould thermal state and deformation for different casting speed, the principle for the layout of thermocouples is obtained. It is shown that, the set of the thermocouples to the meniscus for the plates should be decided by the highest design casting speed, and the location of the thermocouples from the cold side of the plates is deeper, the breakout signals would be caught easier.
Experimental Study on the Cutting Temperature with Micro-Texturing Self-Lubricated Tools
Authors: Wu Ze , Deng Jian Xin , Lian Yun Song , Wang Zhi Jun , Zhao Jun
Published: July 2011

Micro-texturing self-lubricated cutting tools named MTR-1 and MTR-3 were designed and made based on micro-texturing lubricating idea and laser micro-texturing technology. Dry cutting tests on 45# hardened steel were carried out with these self-lubricated cutting tools and conventional cemented carbide tools named MT0. The cutting temperatures and the morphology of chips were measured. The results indicated that the cutting temperatures with the micro-texturing self-lubricated cutting tools were reduced compared with that of MT0 cemented carbide tools, and the chip coiling was improved.
Adsorption Characteristics of Hg2+ Ions Using Fe3O4/Chitosan Magnetic Nanoparticles
Authors: Liang Bo Lin
Published: July 2011

Fe3O4/chitosan magnetic nanoparticles were prepared by chemical cross-linking technique, using dialdehyde starch as a crosslinker, and the adsorption performance of the adsorbent toward Hg2+ was investigated. The adsorption capacity of mercury ions was greatly affected by pH value, adsorption doses and adsorption time. Results indicated that optimal adsorption conditions were pH value, 6, adsorption doses, 140 mg.L-1, adsorption time, 20 min, and the adsorption capacity was 25.12 mg.g-1. The well-defined nanoparticles with a uniform distribution were observed.
Research on the Machining Methods of UHMWPE Fiber Reinforced Composite Laminates
Authors: Li Chun Yun , Sun Ying , Chen Li
Published: July 2011

The effects of machining methods such as high pressure water jet cutting, laser cutting, mechanical cutting on the geometry accuracy,macro aspect of UHMWPE fiber reinforced epoxy composite laminates are studied.Compare the property of geometry accuracy, macro aspect after the UHMWPE fiber reinforce composites laminates, find the processing method and the optimal parameters to provide the best choice for the machining of UHMWPE reinforce composites laminates and further speed up the study of composite dynamic property.
The Study on High-Temperature Oxidation Law of 20CrMo Steel in the Regenerative Heating Furnace
Authors: Wang Tao , Leng Yan Hong , Chen Lian Sheng
Published: July 2011

The special atmosphere of oxidation and reduction combustion in regenerative heating furnace is confirmed by anglicizing working principle of the furnace, and the growth and nature of steel’s oxide layer is influenced by the special combustion atmosphere. From the respects of thermodynamics and kinetics, the high-temperature oxidation regular of 20CrMo steel is studied. The oxidative production include steady oxide of Fe2O3、Fe3O4、FeO.The oxide layer grow slowly when temperature below 1100°C, but speedily when it is over1100°C. With the commutation of valve, the combustion atmosphere of regenerative heating furnace alternates between oxidation and reduction. Following the "intermittent" growth law, 20CrMo steel is in the process of “growth - decomposition –growth”.
Austenite Phase Transformation of Thermal Analysis
Authors: Chen Lian Sheng , Leng Yan Hong , Han Yan Kai , Song Jin Ying
Published: July 2011

In the continuous cooling process, when the metal material austenite transition occurs, latent heat is released. Through the thermal-meter can determine the characteristics point of the phase transition. In this paper, by thermal analysis, at the cooling rate of 0.5°C•s-1, 0.8°C•s-1, 40Cr bar is tested to determine the characteristics point of the phase transition, latent heat and the heat capacity in phase transition.
Experimental Study on Composites with Single-Lap Countersunk Head Bolt Joints
Authors: Wang Pei Yan , Huo Shi Hui , Wang Fu Sheng , Yue Zhu Feng
Published: July 2011

An investigation was performed to study the response of laminated composites with bolt joints. The configuration was single-lap single countersunk head bolt. The major focus was to characterize bearing behavior of laminates and the effect of some parameters such as lap types, fastener types, hole diameter, and stiffness of lapped plate on the bearing strength and stiffness. For this purpose, hundreds of specimens were tested to obtain ultimate loads and stiffness of joints. According to different configurations of joints, three contrast tests were carried out, and some useful conclusions were drawn. Firstly, comparing the stiffness, the joints with protruding head bolts are slightly stiffer than those with countersunk head bolts. And bearing strength of the joints with protruding head bolts are about 10% higher than those with countersunk head bolts. Secondly, ultimate load and stiffness of single-lap double bolts are similar to double-lap single bolt, which are twice bigger than single-lap single bolt. Thirdly, the stiffness of joints can be improved by using bigger hole diameter or stiffer lapped plates. When the hole diameter and stiffer lapped plates are in a reasonable range, bearing strength increase. However, larger stiffness of joint structure may cause transient breaking, which is dangerous for the structure. So in engineering, it is needed to balance the bearing strength and stiffness of joints.
Effect of Ca on Grain Size and Toughness in CGHAZ of C-Mn Steel
Authors: Jia Kun Ning
Published: July 2011

Through adding enough calcium to C-Mn steel, the second phase particles of CaO can be found in C-Mn steel. The microstructure, the grain size and the toughness of CGHAZ in micro-calcium steel and no micro-calcium steel were studied by TEM, SEM and series impact experiment. The research shows that: the second phase particles CaO in micro-calcium steel have strong pinning force to grain boundary of CGHAZ; the second phase particles can retard grain growth in the course of welding in micro-calcium steel, fining grain at CGHAZ and improving the toughness of CGHAZ in micro-calcium steel.
Study of Type 316L Stainless Steel TIG Welding with MoO3 Powder
Authors: Tseng Kuang Hung , Chuang Ko Jui
Published: July 2011

In the present work, a specific oxide flux was used to systematically investigate the effects of activated tungsten inert gas (TIG) welding on the surface appearance, weld morphology, angular distortion, residual stress, and ferrite structure in type 316L stainless steel plates. MoO3 flux used was packed in powdered form. The results showed that MoO3 flux assisted TIG welding technique can produce a significant improvement in power density of heat source and weld aspect ratio, resulting in low angular distortion and residual stress levels. The MoO3 flux assisted TIG welding associated with a rapid cooling rate of the welds, therefore exhibiting higher ferrite content in austenitic stainless steel 316L weld metals during the solidification after welding.
Microstructure and Mechanical Performance of Ultrasonically Brazed Joints of High Fraction Volume of SiC Particulate Reinforced Aluminum Matrix Composites
Authors: Zhang Yang , Qin Cha , Zhu Hao
Published: July 2011

The ultrasonically brazing of 55 vol.% SiCp/A356 composites in air has been investigated. When the ultrasonic vibration is applied for 0.5s, the oxide layer is still continuous at most places between the filler metal and the composites. The shear strength is only ~30% of that of the base composites. As the ultrasonic action time increases, the oxide film sufficiently disappears in the bond region, and the wetted area between the filler metal and SiC particles increases gradually. As a consequence of this, the shear strength of bonds also increases with the ultrasonically acting time. The maximum value of the shear strength of the bonds reaches 165.5MPa when the ultrasonic acting time increases to 5s, which is similar to the shear strength of the base composites.
Reaserch on Measurement of Residual Stresses in Flash-Butt-Weld Rails Using X-Ray Diffraction
Authors: Yan Shao Hua , Chen Hui , Gou Guo Qing , Li Da , Liu Yan , Zhu Zhong Yin
Published: July 2011

The residual stress,which is unavoidable in the process of flash-butt-weld rails,plays important roles in the service life of the railway rails.However,knowledge of magnitude,direction,and sign of the residual stress is useful for maintenance and failure prevention.In this paper,we measured the residual stresses in the flash-butt weld of the U71Mn railway rail,using X-ray diffraction method.Besides,we investigated the influence of grinding on residual surface stress.This investigation showed that residual stress generated by grinding could be removed by electro-polishing,we also found that there was longitudinal compressive stress in the foot and head region,while the web region presented tensile stress,and in the transverse position,all of the three regions existed both compressive and tensile stress.
Study on Fatigue Crack Growth Rate of Welded Joint of Duplex Stainless Steel
Authors: Wang Zheng Lun , Wang Zhi Xiang
Published: July 2011

The fatigue crack growth behavior of weld metal (WM), heat affected zone(HAZ) and base metal(BM) of Duplex Stainless Steel 2205(DSS) has been determined at high-frequency fatigue testing machine. The results show that the fatigue crack growth rate of WM is slowest and the ability to resist fatigue crack growth is highest in the three parts. Secondly, the sensitivity caused by the stress change of WM is the highest, followed by HAZ, and the BM is the weakest.
Resistance Spot Welding between Titanium and Stainless Steel with an Aluminum Alloy Insert
Authors: Tu Yi Min , Qiu Ran Feng , Shi Hong Xin , Zhang Xin , Zhang Ke Ke
Published: July 2011

The resistance spot welding between commercially pure titanium and stainless steel was achieved using an aluminum alloy insert. The interfacial microstructure and mechanical properties of the joint were investigated. The maximum tensile shear load of 5.38 kN was obtained from the Ti/SUS304 joint welded at the welding current of 10 KA. The results reveal that the property of the Ti/SUS304 joint can be improved by using an aluminum alloy insert between Ti and SUS304 sheet.
A Method for Lamping Atoms into Particles in Particle Dynamic Method
Authors: Wei Jie , Nie Yu Feng , Cai Li
Published: July 2011

Generalized particle dynamics method (GP) is a kind of new multi-scale analysis approach which relates various scales naturally through cohering small scale lattice to large-scale lattice. In this paper, a method named nearby condensation method is proposed to lump small scale lattice to large-scale lattice keeping topology structure and mass distribution. The method provides a theoretical support to the GP method. It is indicated that, after cohesion BCC (Body-Centered Cubic) crystal structure possessed the same topological structure and mass distribution, and FCC (Face-centered cubic) crystal structure possessed the same topological structure, but the mass distribution gradually converges to a steady state.
Electro-Generation of 2, 3, 5, 6-TCP in Zn, Ni,P-mSA/mCS Bipolar Membrane Equipped Electrolysis Cell
Authors: Xie Hong Fang , Xiao Yan Chun , Li Shao Bin , Zhen Chen
Published: July 2011

P-ferrocene-SA/acetylferrocene-CS Bipolar Membrane (BPM) was prepared with phosphorylated agent as the cation exchange layer, and chitosan (CS) modified with acetylferrocene as the anion exchange layer. Zinc/Nickel alloy layer was placed on the surface of cation exchange layer to realize zero polar distance in the cathode chamber. The 2, 3, 5, 6-tetrachlopyridine (2,3,5,6-TCP) was electro-synthesized by reducing of pentachloropyridine(PCP). At the current density of 30mA·cm-2, the current efficiency was 70.1% and the yield of 2, 3, 5, 6-TCP was up to 96%. Compared with the traditional method, the electro-generation technology greatly eliminated the environmental pollution.
Air-Water Interfacial Film of Zirconia and its Heat-Treatment
Authors: Kan Chun
Published: July 2011

The air-water interfacial zirconia film composed of nanodisks with self-assembly structure is prepared. Scanning electron microscopy (SEM), Energy Dispersive Spectrum (EDS), X-ray diffraction (XRD) and Transmission electron microscopy (TEM) are used to characterize the film. Furthermore, the heat-treatment of this film is studied by thermogravimetry and differential thermal analysis (TG-DTA), XRD, and Raman spectroscopy (Raman). The results suggest that the zirconia of the samples changes from amorphous phase to t-ZrO2phase then m-ZrO2phase with the rise of calcined temperature.
Development and Application of Cold-Formed Steel Structure Dwelling System
Authors: Xu Chao , An Yu Hua , Zhao Yue Ming
Published: July 2011

Cold-formed steel structure dwelling system is becoming the major development trend of steel structure for its lightweight, long durability and quick construction. In this paper, the development process of technology and application of cold-formed steel structure dwelling system in China and abroad is introduced. Compared with developed countries there is great disparity in this area.
Effects of Synthesis-Solvent on Characteristics of Poly(N-Isopropylacrylamide) Hydrogels Synthesized by Frontal Polymerization
Authors: Feng Qiao , Du Ling Zhi , Yan Qing Zhi , Ge Chang Chun
Published: July 2011

The synthesis of thermo-responsive hydrogels poly(N-isopropylacrylamide )(PNIPAm) by frontal polymerization (FP) was carried out in four mixed solvents, i.e. dimethylsulfoxide (DMSO) mixing with water, ethanol, tetrahydrofuran (THF) and acetone, respectively. The influences of mixed solvent on frontal parameters, pore morphologies, swelling behavior of PNIPAm hydrogels were investigated. The pore of PNIPAm hydrogel synthesized in THF/DMSO was observed a big honeycomb cells, others were channel-like cells. Furthermore, the sample obtained in THF/DMSO had higher swelling ratio as compared to others, and the one synthesized in Water/DMSO showed the lowest. Above results indicated that fine-tuned poly(N-isopropylacrylamide) hydrogels can be prepared in short time and with easy protocol by adjusting mixed solvents in frontal polymerization process.
Development and Design of Coal Gangue Concrete Filling Material
Authors: Sun You Xia , Li Xing Dong
Published: July 2011

This paper developed a kind of concrete with coal gangue as coarse aggregate in order to solve the environmental pollution problem and meet the requirement of filling material in gob-side entry retaining. Firstly physical properties and chemical properties of coal gangue were analyzed, and then several schemes of mix proportion were designed, according to which new product was trial-produced in the laboratory. The optimal mixing ratio was selected by testing the performance of trial-product. Industrial test indicate that the coal gangue concrete can be used as filling material for the gob-side entry retaining, which not only solve the problem of ecological environment and resource shortage, but also reduce the cost of filling material and increase the economic benefit of coal mine enterprise.
Fabrication and Luminescent Properties of Translucent Ce3+:Lu2SiO5 Ceramics by Spark Plasma Sintering
Authors: Lin Ting , Fan Ling Cong , Xu Zhi Bin , Shi Ying , Xie Jian Jun , Deng Lian Yun , Ren Yu Ying
Published: July 2011

The spark plasma sintering (SPS) technique was employed to investigate the fabrication of cerium-doped lutetium orthosilicate (Ce:Lu2SiO5, LSO) polycrystalline scintillation ceramics starting from nanosized Ce:LSO powders synthesized by sol-gel processing. Fully-densed polycrystalline Ce:LSO ceramics with fine grains were fabricated on optimal sintering conditions of 1350°C for 5 min under pressure of 50 MPa. Translucent monolithic Ce:LSO ceramic sample was obtained with excellent luminescent characteristics after being annealed in air at 1000°C for 15 hrs. Under 360 nm UV excitation, a broad emission peak centered at 425 nm was detected for Ce:LSO ceramic, with a short decay time of only 9.67 ns. The luminescence intensity of annealed sample(doped by 0.5mol% Ce3+) is 3 times greater than that of BGO crystal under X-ray excitation. The good luminescent characteristics make Ce:LSO polycrystalline ceramics a promising scintillator candidate with high performance for radiation detection in future.
Ab Initio Calculation of (001) TiAl3/Al Interface
Authors: Wang Li , Gong Jian Hong , Gao Jun
Published: July 2011

We employ density functional theory to investigate TiAl3/Al interfaces with the orientation of (001) [100]Al//(001)[100]TiAl3 by electronic structures, relaxed atomic geometries and adhesions. The preferable interfacial atomic structure is that wherein Al atoms continue on the natural stacking sequence of bulk TiAl3. Two types of TiAl3 (001) slabs, Ti-centered, all Al atoms, are adopted to compare interfacial energy, interfacial electronic structure. The calculated adhesion energies Wadof the two types of interface are very close, and are quantitatively in agreement with other calculated results of Al on the carbide and nitride, but much lower than the (111)Al[1 0]Al//(0001)TiB2[11 0]TiB2 adhesion energy. We have thoroughly characterized the electronic structure and determined that the metallic Al-3p and Ti-3d bonding constitute the primary interfacial bonding interaction.
Microstructures and Properties of Laser Cladding Composite Coating of Nano-Y2O3/Co-Based Alloys
Authors: Yang Shang Lei , Hu Feng Guang , Lin Qing Lin
Published: July 2011

By using laser cladding technology, a nano-Y2O3/Co-based composite coating was prepared in the Ni-based alloys substrate with Nano-Y2O3 and cobalt based alloys powder. The microstructure, micro-hardness wear resistance of the composite coating were researched by scanning electron microscopy (SEM) and other testing methods. The results show that the micro-hardness of laser cladding is HV868, and the welded surfacing layer is only HV512. Wearing values are decreased by 25.6 mg of the surfacing layer to 0.5 mg of the laser cladding layer in the wear testing of 40 minutes. The wear resistance of laser cladding layer is 51 times of the the wear resistance of the surfacing layer using the Co-28Cr-4W-1C electrode. The microstructure of laser cladding layer consists of the fusion zone, the fine equiaxed dendrite zone and the coarse crystalline zone.
Influence of the Concentration of La High Doping on Conduction of ZnO
Authors: Xiong Zhi Hua , Chen Lan Li , Wan Qi Xin
Published: July 2011

We have performed a study on La heavily doped ZnO, based on the first principles. The calculated results show that with the increase of concentration of La, the lattice parameter is expanded. It is found that the top of valence band maximum is determined by the O-p states and the conduction band minimum is depended on the La-f and La-d states. The band gap of doping system is broadened as the increase of concentration of La, because the valence band moves towards lower energy more than the conduction band does. Furthermore, it is found that heavily doping of La with low concentration can enhance the conductivity of ZnO. The results are helpful to gain a systematic understanding of electrical properties of La-doped ZnO.
Numerical Simulation of Canned Hot-Extrusion Process of Mo Powder
Authors: Li Jian , Zhang Jun
Published: July 2011

Aiming at the stress state in the hot-extrusion process of Mo powder, the paper has studied the 3D stress characteristics provided by the hot-extrusion of the canning. The material model is established by the finite element software DEFORM-3D. Via calculating, the load-stroke curve, temperature, relative density, the equivalent stress and the equivalent strain distribution characteristics were obtained. The results show that canned powder after hot-extrusion technology can improve its density greatly. The press load grows fleetly at early, and then slowly grows at the stable stage. Only reach last stage the press load drops quickly of the hot-extrusion. The maximum temperature and maximum equivalent strain appear below the die entrance. The maximum equivalent stress appears in the die entrance. Therefore ,the die entrance angle and the surface geometric parameters of the die have significant effects on the equivalent stress.
Dynamic Analysis of Piezoelectric Smart Structures
Authors: Li Jie , Hu Li Li , Qin Li , Liu Jun , Tao Rui Ping , Yu Xi Ning
Published: July 2011

In order to solve the active vibration control of piezoelectric smart structures, focus problems on the structural analysis of the dynamic characteristics. To piezoelectric smart structure for the research object, finite element modal analysis, solving the natural frequency and response characteristics. Firstly, analyzed the problems of structural eigenvalues ​​and eigenvectors problems, then prepared dynamic response analysis program of FEM based on MATLAB, and complete the theoretical model calculations. At the same time, using ANSYS software to simulate and analyze, theresults show that, ANSYS simulation result is consistent with the theoretical value, so as to study the piezoelectric active vibration control of smart structures and lay a good foundation.
Optimization of Steel A20402′Parameters under Pulse Electric Field
Authors: Song Lin Sen , Wang San Bao , Lu Peng Tao , Wang Huan Qin
Published: July 2011

Through the Orthogonal ,the structure of A20402 steel quenching was studied under the action of pulse-electric field in this paper. The results has found the parameters to reduce the heating temperature of quenching and shorten the holding time,and its hardness is 2~3HRC higher than that of quenching under common condition.The Ma-organization and distribution could be improved obviously.The process could improve work efficiency and reduce costs.
Effects of Ultrasonic on Ability of Learning and Memory in Kunming Mice
Authors: Wang Bao Qiang , Yang Liang Liang
Published: July 2011

Objective:to study the effects and mechanisms of ultrasonic on ability of learning and memory in Kunming mice.Methods:changing the time of irradiation can get different dose of ultrasonic. Using Morris water maze analyzes the activity of Kunming mice on different time points. Remain the same ultrasonic irradiation time, and find the rule of platform latency by comparing the ultrasonic method with no ultrasonic. According to statistics analyzing related experiments data by SPSS and the theory of ultrasonic biological effects, how ultrasonic affects the ability of learning and memory in mice can be found. Results: small doses of ultrasonic have positive significance on the learning and memory ability in mice .But more than regular doses, the ability of learning and memory will be badly damage. After ultrasonic irradiation, the latency is discrete distribution while no ultrasonic irradiation the latency is stable.Conclusion:ultrasonic has certain effects on the learning and memory ability in Kuming mice. Its mechanism is the mechanical, thermal, cavitation effect of ultrasonic.
Effects of Microstructure and Mechanics Performance of Laser Clad with Different Base
Authors: Peng Ru Shu , Tang De Wen , Li Rui Qing
Published: July 2011

The surfaces of 45 steel and. 1Cr18Ni9Ti are coated with WFCL-11 laser cladding. Microstructure and hardness of their interfaces and surfaces of laser cladding are investigated, and their structure, property, hardness are analyzed under shock load. The effects of the different material ingredients between base and laser clad on their interfaces were found. The little the difference, the better the Interface.
Natural Convection Heat Transfer of the PCM Microcapsule Slurry for a Solid Phase State in a Horizontal Rectangular Enclosure
Authors: Zhang Yan Lai , Rao Zhong Hao , Wang Shuang Feng , Zhang Hong , Li Li Jun , Zhang Ming Long
Published: July 2011

This experiment on natural convection heat transfer with the PCM microcapsule slurry for a solid phase state of the PCM were performed at a horizontal rectangular enclosure heating from below and cooling from top. In the present study, important parameters affecting the natural convection heat transfer of the slurry with the PCM were taken into account such as the mass concentration of the PCM microencapsulated into the slurry, the temperature difference between heating plate and cooling plate, the Rayleigh number Ra and the aspect ratio (width/height) of the horizontal rectangular enclosure. The heat transfer characteristics of the PCM microcapsule slurry on natural convection were concluded from predicted conditions simplified by classifying the temperature ranges into three sub-regions, in which the PCM in the slurry was in only solid phase state, phase change state or solid-liquid coexistence state and only liquid phase state of the PCM in the microcapsule, respectively. The upper cooling plate was fixed at a constant temperature in each region, and the lower heating plate temperature was varied by carefully adjusting the electric power input of an electric plate heater. And experiment was done under the thermal steady condition in the PCM microcapsule slurry. Emphasis was given on phase changing temperature range, and experiments had been performed for four kinds of enclosures with various heights.
Finite Element Analysis on Temperature Field of Laser Brazing
Authors: Yang Zhi Bo , Zhang Li Mei , Luo Peng Fei , Xu Jiu Hua
Published: July 2011

The purpose of this paper is used Ansys to simulate the temperature field of laser brazing by FEM. The 3-D solid elements are used in FEM model, and nonlinear factors of temperature-dependent material properties are considered. The surface temperature grades have been attained, and the brazing experiment have been conducted, the results show that the wetting of Ni-Cr alloy to diamond is good. This study is useful for selecting reasonable processing parameters on laser brazing.
Analysis on Structural Property and Seismic Performance of the P’ai-Lou Gateways in Xi'an Great Mosque
Authors: Gao Da Feng , Li Wei , Ding Xin Jian , Cao Peng Nan
Published: July 2011

Study on the mechanics performance of ancient Chinese timber structure is of great significance. The paper based on P’ai-lou of Xi'an Great Mosque as the research object, and used spring elements to simulate semi-rigid of mortise-tenon joints, just answered to the finite element numerical analysis. The stiffness values of mortise-tenon joints were got by nonlinear contact analysis; Under the vertical load, the inner force of structure is far less than its design value, and the safety margin of structure is above 60%; The differential motion equation of structure was given, the first six natural frequencies and the vibration performance of the P’ai-lou were got by the model analysis; Based on Spectrum analysis and time-history analysis , the results show that the ancient Chinese timber structure is soft, and has a better energy consumption performance as well as a "meet strong a strong" intelligent shock absorption characteristics. Analysis and calculation results provide the theory basis for maintenance and protection of ancient Chinese timber structure.
G12V190 Type Diesel Engine Exhaust Muffler Design Based on Transfer Matrix Method
Authors: Ma Jin Sheng , Zhou Ling , Dang Zhi Quan , Liu Zi Feng , Zhuang Da Min , Yang Bo , Dai Na Na , Xia Zheng
Published: July 2011

In this paper the diesel engine exhaust noise in petroleum well workplaces has been measured, the peak values scatters mainly in the low-frequency range, and the top value has reached 123dB. Based on transfer matrix method, this paper analyzes six kinds of silencing elements and establishes optimizing calculation procedure for diesel engine exhaust muffler. According to optimizing calculation procedure and exhaust noise frequency spectrum characteristic of diesel engine, we have designed a new large amount resistance muffler for G12V190 type diesel engine. After petroleum well scene experiment, the insertion loss of exhaust muffler has reached 33dB.
Experimental Study on the Seismic Performance of Composite Shear Wall Structure with Thermal-Insulation Wall Form
Authors: Zhu Min Wei , Liu Yuan Zhen
Published: July 2011

The composite shear wall system with permanent thermal-insulation wall form of glazed hollow bead is a new kind of energy-saving building. the experimental study on the seismic performance of composite shear wall structure was proposed. Through the tests of the walls with different shear-span ratio and axial compression ratio under vertical force and low cyclic horizontal load, the seismic behaviors of slitted shear walls under low cyclic load tests were studied. Through the expemental study, the calculation methods for load-bearing capacity of walls with different shear-span ratio were obtained. And then the laws for the energy dissipation and ductility feature were revealed. Besides, the comparison analysis were made on the seismic behaviors between composite shear walls and common shear walls.The study could provide a foundation for the designing evaluating on the performance for the new structure.
Mechanical Properties and Applications of Carbon Nanotubes
Authors: An Li Bao , Feng Li Jia , Lu Chun Guang
Published: July 2011

This paper presents a review of current research, both theoretical predictions and experimental measurements, on the mechanical properties of carbon nanotubes (CNTs). The emphasis has been given to the tensile strength and Young’s modulus. Deformabilities including buckling, bending, and twisting are also examined. The predicted and measured values of mechanical behaviors of CNTs are compared and an analysis on the variation of the values is made. The challenges facing the research of mechanical properties of CNTs are stated. CNT reinforced composites are involved as well in the paper. A thorough understanding of the properties of CNTs helps exploring full applications of this unique group of materials.
CuInS2 Thin Films Obtained by Spray Pyrolysis Deposition Using Sodium Dodecyl Sulfate Additive in Precursors Solution
Authors: Perniu Dana , Popovici Ionut , Toader Cosmina , Duta Maria , Gosman Mirabela
Published: July 2011

In recent years, chalcopyrite semiconductor thin films are being intensively investigated for low-cost terrestrial phovoltaic applications. One prerequisite for solid state solar cells is the strong interface to allow the intimate contact between semiconductors. The paper studied the possibilities of CuInS2 thin film surface control by using sodium dodecyl sulfate as additive in precursors’ solution in concentration below and above the critical micelle concentration of the surfactant in solution. The sample with the amount of surfactant lower than the critical micelle concentration in precursors’ solution has the highest surface energy value. The use of surfactant conducted to increased preference for formation of thin films with peaks, the higher peaks being obtained for the thin films obtained from solutions with surfactant concentration higher than critical micelle concentration.
Infrared Thermographic Diagnosis Mechnism for Fault Detection of Ball Bearing under Dynamic Loading Conditions
Authors: Seo Jin Ju , Yoon Hanvit , Ha Hyeonsu , Hong Dong Pyo , Kim Wontae
Published: July 2011

Fault detection during dynamic loading conditions of rotational machineries unlike the traditional diagnosis method, the use of contactless, non-destructive infrared thermographic method is proposed. In this paper, by using a rotating deep-grooved ball bearing, passive thermographic experiment was performed as an alternative to proceeding the traditional fault monitoring. In addition, the thermographic experiment was compared with the traditional vibration spectrum analysis to evaluate the efficiency of the proposed method. Based on the results, the temperature characteristics of the ball bearing under dynamic loading conditions were analyzed thoroughly.
Study on the Finite Element Method for Three-Dimensional Static Property of Polyurethane Vibration Isolators
Authors: Shu Li Hong , He Lin , Liu Bai Feng
Published: July 2011

Based on the experimental study of its constitutive relations, uses the ABAQUS finite element analysis software to simulation analyzes the three-dimensional static property of one type of polyurethane vibration isolators. The numerical analysis and experimental result demonstrate that the material constitutive model built by this method can describe the three-dimensional static mechanical property of the polyurethane isolator accurately. This method provides certain reference value for establishment of the constitutive relations of other types of polyurethane isolator.
Characterization of Ni and Ni-Co Alloy Coatings Prepared by Pulse Current Electroplating
Authors: Liu Lei , Yang Hai Feng , Li Rui Feng
Published: July 2011

The traditional pure nickel coatings and the Ni-Co alloy coatings were prepared with the same parameters on the type 316L stainless steel substrates by utilizing two-ways pulse current electroplating method. And then, we used atomic force microscope (AFM) to observe their surface morphologies and structures and obtained their 3D images. The results of AFM showed that the Ni-Co alloy coating were superior to the traditional pure nickel coating on mechanical and tribological properties respects. For example, the surface of the Ni-Co alloy coating is smoother and even than that of the traditional pure nickel coating. Direct current (DC) and two-ways pulse current electroplating two methods were adopted respectively to prepare the Ni-Co alloy coatings. Followed we observed their surface morphologies by using AFM. The result showed that under the same experimental parameters the coating of the two-ways pulse current electroplating is superior to conventional DC electroplating coating in the surface morphology, grain size and microstructure and so on.
Preparation and Characterization of Superhydrophobic Polypropylene Surface with Excellent Self-Cleaning Property
Authors: Yuan Zhi Qing , Wu Jun Liang , Hao Xi Hai , Wang Xu Nan , Xu Xun Meng , Zhang Hui Ping
Published: July 2011

A superhydrophobic polypropylene surface was obtained by a facile method. The water contact angle and sliding angle of the superhydrophobic polypropylene surface were 157±1.8ºand 1.6º, respectively. When the superhydrophobic polypropylene surface was contaminated, 99 % contaminant particles were removed from the superhydrophobic polypropylene surface by artificial rain, showing excellent self-cleaning property.
Formation Mechanism of Linear Explosive Formed Penetrator by Midpoint Initiating Manner
Authors: Gou Rui Jun , Zhang Shu Hai
Published: July 2011

Linear explosively formed penetrator (LEFP) is an optimal combination of linear cutting sword and conical shaped charge but is completely different with those two above. Initiating manner of LEFP is one of the most important factors that can affect its performance obviously. LEFP forming mechanisms of linear shaped charge initiated from the mid-point were studied with combined method of theoretical analysis, experiments and numerical simulation. Liner movement driven by the detonation wave action was analyzed as a three-dimensional issue and a synthetical model of liner movement was established. The model were verified by the penetrating experiments with the LEFP initiated from midpoint under stand-off which is 5 times distance of the LEFP caliber size. Formation processes of LEFP were described through numerical simulation and the simulation results were in concordance with those of experiments.
Effects of Asymmetric Bending on Wear of Rolls in a Six-High Cold Rolling Mill
Authors: Bai Jin Lan , Wang Jun Sheng
Published: July 2011

In this paper, roll wear calculation model is developed considered the length of rolled strip, load distribution between rolls, roll surface roughness and other factors, and the corresponding calculation procedure has been developed. The experimental results show that the calculation value of the program is close to the actual data, and its accuracy can meet the requirement of on-line shape control. Based on the procedure, wear of each roll is calculated to study the effects of asymmetric bending. It is shown that asymmetric bending can decrease the local severe wear of rolls, and improve the uniform degree of roll wear distribution, thus the effects of asymmetric bending force on intermediate roll is better than that on work roll. Therefore asymmetric bending of intermediate roll can be used to reduce the wear of rolls in production.
A Feasibility Study on Increasing Surface Hardness of Austenitic Stainless Steels by Pack Co-Deposition of N and Cr
Authors: Zeng D. , Yang S. , Xiang Zhi Dong
Published: July 2011

This study is an attempt to codeposit N and Cr into the surface of austenitic stainless steels by pack cementation process to simultaneously increase their surface hardness and corrosion resistance. The pack powders were prepared using Cr2N powder as a source of both N and Cr, NH4Cl as activator and Al2O3 as inert filler. Specimens of the AISI204 austenitic stainless steel were treated in the 2 wt% NH4Cl activated 15Cr2N-85Al2O3 (wt%) pack at 1100 °C for different times. It was demonstrated that a top Cr2N layer with a Cr enriched zone underneath can be formed on the steel surface via the vapour phase generated in the activated powder pack. The effect of adding Cr powder into the pack powders on the surface layer formation and on the hardness profile at the cross-section of the specimen surface was also investigated. Hardness values of more than 1800 HV were obtained at the outermost surface of the treated specimen.
Supersonic Missile Control with PI Sliding Mode Method
Authors: Ma Qiang , Jin Yu Qiang
Published: July 2011

Comparing with traditional adaptive methods, a very simple PI sliding mode controller is designed for uncertain nonlinear missile systems with the help of two main assumptions which are also testified to be reasonable.The construction of PI control for sliding surface is novel and effective. Also, the proof of PI type control law is unique in this paper.
Silica Nanowires Decorated with Cryptophane-A for Sensing Methane
Authors: Tao C. , Li X. , Yang J.
Published: July 2011

Silica nanowires (NWs) were prepared on the Si wafer with a modified thermal evaporation of silicon monoxide and cryptophane-A was fixed to the surface of the silica NWs for methane sensing. Scanning electron microscopy equipped with EDS was used to characterize the morphology and composition of the sensitive material. A fiber optical device was designed to operate via luminescence reflection and the methane sensing properties were characterized at room temperature. The sensing material shows a stable and strong blue luminescence when excited by UV light source at wavelength of 380 nm, and it is efficiently quenched by molecular methane within the methane concentration range between 0.2% and 3.5% (v/v). This novel methane sensing material has significant advantages and might have application potential.
Decision Model Research of Production Model Based on Fuzzy Theory
Authors: Lin Ren Chun , Pang Ru Ying , Yang Yang , Song Wei
Published: July 2011

This paper is a new mode of production decision model based on fuzzy theory. The decision model was a combination of qualitative and quantitative analysis, Firstly, according to expert assessment method to establish fuzzy matrix, Application of the paired comparison method to establish the weight, Then considering the combined effects of factors of business costs to build mathematical decision model of order penetration point, Calculate the optimal inventory point of a variety of products in line with order penetration point, through the location of the inventory point to determine the mode of production. The case shown that the decision model can help companies determine which kind of production model can be used, Make-to-order, Make-to stock or Hybrid.
Study on DC Double Pulse MIG Welding of Automobile Aluminum Alloy
Authors: Zhang Zhao Dong , Kong Xiang Yu
Published: July 2011

In this paper, the features of weld formation, porosity, arc behavior, microstructure and mechanical properties of 6061 Al alloy thin sheet welds by direct current (DC) double pulse metal inert gas (MIG) welding process are investigated and compared with the traditional DC MIG welding process. Results show that continuous one-side welding with back forming weld beads without spatters, undercuts or cracks can be obtained by using the DC double pulse MIG welding process. The porosity of weld bead can be largely reduced by using the process. The arc of DC double pulse MIG welding is stable without arc blowout, and the metal transfer model of DC double pulse MIG welding is better than that of DC MIG welding. Microstructure of the weld bead by DC double pulse MIG welding shows a dendrite structure and it is fine and uniform. The average ultimate tensile strength and elongation of the weld bead by DC double pulse MIG welding can get to 228MPa, 80% of base metal, and 7.6%, 63% of base metal.