bluuebunny/crossref_metadata_2025 huggingface dataset:
The Phase Structures and Properties of Pt-Ir-M (M=Zr, Mo, Y) System
Authors: Xie Ming , Chen Yong , Zhang Ji Ming , Hu Jie Qiong , Yang You Cai , Chen Yong Tai , Wang Sai Bei , Wang Song , Chen Song
Published: March 2015

A series of new alloys including Pt-Ir-M (M=Zr, Mo, Y) were invented in this study. The physical properties, electrical properties parameters and thermodynamics database of the alloys were established. The phase structure and composition were analyzed. The calculation results were verified by experiments. The influence of solidification rate to microstructures, morphology and grain size of Pt-Ir-M alloys were analyzed. According to First Principle, the electronic structures, bonding characters and energetic stability of the alloys were calculated, the calculate result indicated that Pt-Ir-Mo is formed more easily than Pt-Ir-Zr and Pt-Ir-Y, and the formed Pt-Ir-Mo is more stable than Pt-Ir-Zr and Pt-Ir-Y.
Determination of Al, Cu, Ni in Zr-Based Amorphous Alloy by Inductively Coupled Plasma Atomic Emission Spectrometry
Authors: Ma Lan , Qin Guang He , Yu Qiong , Zhou Jing
Published: March 2015

A Method was studied for the determination of Al、Cu、Ni in Zr-based amorphous alloy by inductively coupled plasma atomic emission spectrometry (ICP-AES). Samples were dissolved by hydrochloric acid,nitric acid and hydrofluoric acid,analytical spectral lines for aluminum,copper,nickle are 308.215nm,327.396nm and 231.604nm.Interference of zinc was eliminated by the matrix-matching method, the experiments were done with optimized Operating Parameters. The correlation coefficients of the calibration curve are all 0.999,detection limits are 0.0010%,0.005% and 0.0006% respectively,and the range of recovery is 98%-104%.
Experimental Research on Anti-Cracking Ability of Polyacrylonitrile Fiber Mortar
Authors: Yang Jin Chao , Wang Chun Ming , Wang Shu Guang , Chen Qing , Chen Jian Hua
Published: March 2015

This paper adopts panel constraint method to research the influence of different mixing amount of polyacrylonitrile fiber on plastic cracking of mortar. The research result shows that polyacrylonitrile fiber can prevent cracking and refine the cracks, and the effect will become more obvious with increase of its mixed amount. When the mixed fiber in mortar is more than 1.0kg/m3, the crack can be reduced to more than 90%. The best mixed amount of polyacrylonitrile fiber in mortar is 1~1.5kg/m3. This experimental result can provide theoretical basis for improving anti-cracking performance of mortar or concrete.
The Influence of Sintering Temperature and Whisker Content on the Flexural Strength of Aluminum Borate Whisker Reinforced Aluminum Phosphate Composite Materials
Authors: Peng Guo
Published: March 2015

Aluminum phosphate as matrix material, adding an appropriate amount of aluminum borate whisker, according to a specific method, the aluminum borate whisker reinforced aluminum phosphate composite materials were prepared. The whisker content was 20wt%, 30wt%, 40wt%, 50wt%, 70wt%, and the sintering temperature was 1400 °C, 1450 °C, 1500 °C, 1550 °C, to investigate the mechanical properties variation in different sintering temperatures and different whisker content. Determine the optimum sintering temperature and optimum whisker content, when the mechanical properties of the composite materials are the best.
Experimental Study of Influences of Initial Temperature on Cement Grout Performance
Authors: Yang Jin Chao , Wang Wan Peng , Wang Shu Guang , Chen Jian Hua , Yang Wei
Published: March 2015

Through the experiment, this paper studies and analyzes influence of different initial temperatures on cement grout performance. The results show initial temperature has influences on grout fluidity, bleeding rate, setting time and early strength. Under guaranteed curing temperature, initial temperature has no influence on long-term strength of grout.
Influence of Layered Materials on Properties of Cement Stabilized Macadam
Authors: Ma Quan Hong , Qu Mei Yan , Xu Xue Song , Hu Le Le
Published: March 2015

To reduce shrinkage cracks of cement stabilized macadam base and prolong the life span of pavement, layered materials were mixed in cement stabilized macadam to improve its strength properties and crack resistance. In comparison with the blank test, the unconfined compressive strength increases with the addition of layered materials (weighed at 10% of the amount of cement), by 11.6% with palygorskite, 12.7% with kaolin and 8.9% with montmorillonite, respecetively, at the curing age of 28 days; dry-shrinkage coefficient reduces by 28.2% with palygorskite, 19.0% with kaolin and 14.2% with montmorillonite after 48 days, respecetively. Microstructure of cement pastes mixed with layered materials were observed by scanning electronic microscope. The result shows that more fibrous hydration products and a net-like microstructure exist in cement pastes with palygorskite. It may explain the maximum decrease in shrinkage cracks of palygorskite-mixed cement stabilized macadam.
Mechanical Properties of High Strength Desert Sand Concrete
Authors: Liu Hai Feng , Ma Ju Rong , Chen Yun Long , Yang Deng
Published: March 2015

In order to research on the mechanical properties of high strength desert sand concrete, the compressive experiment of high strength desert sand concrete with different desert sand replacement ratio was carried out. The influence of desert sand replacement ratio on the compressive strength and specific energy absorption of high strength desert sand concrete was analyzed. Experimental results shows that the optimum desert sand replacement ratio is from 0 to 40%, which provides advice and guidance to the utility of high strength desert sand concrete in practice.
Research on Separation and Regeneration Aggregate of Recycled Asphalt Mixture Road Performance
Authors: Zhou Xin  Feng , Xu Xi Juan
Published: March 2015

Through the research of different separation and regeneration aggregate content, different types of regenerative high temperature stability, low temperature performance and water stability performance of asphalt mixture comprehensively, the results show that: with the increase of recycled aggregate content, improves the high temperature properties of recycled asphalt mixture, low temperature performance and water stability are reduced, the admixture when regeneration aggregate is 20 ~ 25%, recycled asphalt mixture has good road performance.
Key words: road engineering;waste asphalt mixture;separation and regeneration aggregate;road performance
The Study of Composite Material of Al-C System
Authors: Andreyachshenko Violetta , Lezhnev Sergey , Kuis Dmitry , Panin Evgeniy
Published: March 2015

In this work was done an investigation of the phase composition of the composite AL-C system using a computer simulation in software ThermoCalc. Evaluated the stability of the system by the method of analysis of Gibbs energy for the entire range of carbon content. The technology of obtaining samples of the AL-C system using the fine carbonaceous materials. Studied the microstructure of the samples and mechanical characteristics. It was found that carbon has positive influence on the properties of the obtained materials.
Study of the Degradation Behaviour of Biomaterial Mg-4.0Zn-2.0Sr Alloy in SBF
Authors: Cui Tong , Guan Ren Guo , Qin Hai Ming , Song Fu Lin
Published: March 2015

In
v
itro degradation behaviour and biological properties of Mg-4.0Zn-2.0Sr alloy sheet had been studied. The results indicate that a novel biodegradable Mg-4.0Zn-2.0Sr (wt. %) alloy sheet was successfully produced using a series of metallurgical processes. The corrosion of Mg-4.0Zn-2.0Sr (wt. %) alloy sheet immersed in SBF occurred as a cyclic process: pitting corrosion →extending of pitting corrosion along grain boundary→ localized corrosion → pitting corrosion again at the new exposed surfaces and the corrosion products were found that contain HA, CaCO3 and MgOH. The change of corrosion rate of Mg-4.0Zn-2.0Sr alloy sheets immersed in SBF is unstable until the 17th day and the average corrosion rate of the alloy sheets was 1.244 g/(m2 • h) after 17 days immersing, which is slightly higher than that of Mg-4.0Zn-1.0Sr alloy sheet 1.163 g/(m2 • h). The corrosion resistance property in SBF of Mg-4.0Zn-2.0Sr alloy is slightly lower than that of Mg-4.0Zn-1.0Sr alloy, which is proved by electrochemical measurements.
The Influence of the Addition Element of Zn and Sr to Degradation Behavior of Pure Magnesium
Authors: Cui Tong , Guan Ren Guo , Yang Cao , Qin Hai Ming , Song Fu Lin
Published: March 2015

The influence of the addition element of Zn and Sr to degradation behavior of pure magnesium simulated body fluid (SBF) had been studied. The results indicate that the corrosion destroy on the surface of pure magnesium was reduced markedly through the addition element of Zn and Sr. The average corrosion rate of pure magnesium, Mg-1.0Zn and Mg-4.0Zn-1.0Sr alloy is 1.526 g/(m2•h), 1.337 g/(m2•h) and 1.163 g/(m2•h), respectively.
Effect of Dimethyl Sulfoxide (DMSO) on Cellulose Solution with High Concentration
Authors: Cao Hai Tao , Song Jun , Fang Xiao Lin
Published: March 2015

The effect of DMSO on high concentrated cellulose-AMIMCl was studied in this paper. DMSO decreases the viscosity of cellulose solution obviously, however, the viscosity do not decrease more when the concentration of DMSO increases beyond 30wt%. Cellulose coil can be swelled after adding DMSO as a result of the low viscosity and more coil becomes more apart. The different order of mixture affect the solubility of solvent and DMSO as an excellent aprotic solvent do not affect the degradation of cellulose in AMIMCl.
Preparation of Zeolite from Waterworks Sludge for Ammonium Ion Removal in Wastewater
Authors: Zhao Chun Xia , Zhang Chun Hui , Meng Tan , Han Shan Shan , Jiang Jia Yu , Yin Qing Xin , Guo Mei Tong , Shao Bo Quan , Rong Gui Juan
Published: March 2015

An appropriate disposal technology should be developed for a mass of waterworks sludge (WWS) as the solid waste. While, it can be used to produce zeolite, containing a lot of aluminum and silicate elements. In addition, the synthetic zeolite was widely used because of smaller particle size and higher purity than clinoptilolite. Therefore, the WWS and sodium hydroxide were adopted as raw material; the synthetic zeolite was used as seed crystals to obtain WWS zeolite by induce crystallization, under normal pressure at 125 ºC. The adsorption and exchange capacity of WWS zeolite was 18.3 mg/g when the initial concentration of ammonium ion was 100 mg/L in wastewater.
Simulation Study of the Volume Properties and Diffusion of 1-Butyl-3-Methylimidazolium Tetrafluoroborate/Ethanol Mixture
Authors: Tian Guo Cai , Wang Ding
Published: March 2015

The molecular dynamics simulation method is used to study volume properties and diffusion of 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4])/ethanol mixture with different molar fractions of ethanol. It is found that the density of the mixture decrease with the increasing of the mole fraction of ethanol, whereas the diffusion coefficient increases. The excess molar volume all appear negative over the entire mole fraction of ethanol which agree well with experimental results.
Synthesis and Crystal Structure Hindered Amine with Methaerylate
Authors: Xue Wei Wei , Zhang Xiu Qin , Chen Qiang , Jin Ji , Lu Guo Yuan
Published: March 2015

The high pure hindered amine with methaerylate (2,2,6,6-tetramethylpiperidin-4-yl methacrylate) 4 was synthesized by a condensation reaction of 2,2,6,6-tetramethylpiperidin-4-ol and methacrylic anhydride via isolation of the salt (1:1) of 4 and methacrylic acid in an improved yield (total 80%). The structure of the salt 4 of hindered amine was demonstrated by X-ray crystallographic analysis.
Synthesis of Hyperbranched Polyphenylacetylene Resins and the Influence of their Molecular Architecture on their Properties
Authors: Gu Kai , Xu Xiao Di
Published: March 2015

Hyperbranched polyphenylacetylene resins were obtained by the homo-and copolycyclotrimerizations of diynes and monoynes initiated by tantalum-based catalysts, with the aim of exploring new synthetic routes to hyperbranched polyphenylacetylene resins. A group of hyperbranched poly (alkylenephenylenes) (hb-PAPs) were synthesized by TaBr5-Ph4Sn catalyzed polycyclotrimerization of 1,7-octadiyne. To improve the solubility of the homopolymers,the diyne monomers were copolymerized with phenylacetylene. IR,and 1H NMR Spectrum confirmed that the target polymers had formed via a [2+2+2] cyclotrimerization mechanism. The influence of the architecture of homopolymer and copolymer obtained from different kinds of monomer on the thermal properties and solubility were investigated.
The Application of Dye Materials on Efficient Visible Light Photocatalysis
Authors: Yang Yi Si , Zhang Yan
Published: March 2015

Dye-catalyzed enone cycloaddition under visible light is described. A variety of dyes were screened, rhodamine B was found best for this reaction. Kinds of symmetrical aryl bis (enones) were well tolerated. The cyclizations could also be conducted using sunlight as the only source of irradiation.
Biomineralization-Inspired Synthesis for Hierarchical Structured ZnO Powders with Enhanced Potocatalytic Activity
Authors: Xie Jing Jing , Zeng Hui , Wang Meng Hu , Xie Shao He , Fu Zheng Yi
Published: March 2015

Nature is a perfect designer in fabricating biomaterials with well-defined and hierarchical nanostructures. Here we report a biomineralization-inspired approach for preparing hierarchical ZnO structure with high UV-light efficiency. The results show that biomacromolecules play an important role on controlling growth and assembly of ZnO nanostructures. It is found that the biomacromolecules favoring the isotropic growth of ZnO at the high concentration.
Evolution of Phase Structure and Micro-Morphologies of the La0.7M0.3MnO3 (M=Ca, Sr) Sintered at Different Temperature
Authors: Jiang Shao Qun , Wang Gang , Li Zong Shu , Wang Ze Hua , Zhou Ze Hua , Cheng Jiang Bo
Published: March 2015

The La0.7M0.3MnO3 (M=Ca, Sr) were synthesized by combining sol-gel technique and solid state sintering method. The evolutions of phase structure and micro-morphologies of the La0.7M0.3MnO3 with final sintering temperature (950-1250°C) were investigated. The results show that the La0.7Ca0.3MnO3 compounds exhibit single perovskite phase with cubic structure and the La0.7Sr0.3MnO3 compounds exhibit single perovskite phase with rhombohedra structure. The final sintering temperature has no obvious effect on the phase structure of La0.7Ca0.3MnO3. However, the density and grain size of La0.7M0.3MnO3 (M=Ca, Sr) increase with the increase of the final sintering temperature. Moreover, the micro-morphologies of La0.7Ca0.3MnO3 are more sensitive to final sintering temperature compared with that of La0.7Sr0.3MnO3. When sintering temperature is no less than 1150°C, the La0.7Ca0.3MnO3 has hardly any pore. After sintering at no less than 1250°C, the La0.7Sr0.3MnO3 becomes dense.
Study of Salen(Al) Complex Catalytic System in Ring-Opening Polymerization of Lactide
Authors: Nie Yun , Tian Jing , Zhang Qing , Du Meng Fei , Hao Xiao Lun , An Hai Xia , Li Hui , He Yan Jie , Meng Xiang Jing
Published: March 2015

In this paper, salen (Al) complex catalytic system was synthesized and used in the polymerization of lactide. The salen (Al) complex catalytic system was characterized by infrared spectroscopy (IR), and nuclear magnetic resonance spectroscopy (NMR). The influences of different factors, including reaction time, reaction temperature, and the ratio of lactide/Al3+ on the synthesis of polylactide were also described in the investigation. The results showed that the complex catalytic system could be successfully applied in the ring opening polymerization. The optimum condition of the ring opening polymerization of lactide, which included lactide/Al3+ (mol/mol) ratio of 300, reaction temperature of 140 °C, and reaction time of 12 hours.
Density Functional Studies on the Standard Heats of Formation for Nitroaromatic Molecules
Authors: Su Xin Fang
Published: March 2015

The standard heats of formation for 12 nitroaromatic molecules in gas at 298 K were calculated at B3P86/6-311G** levels using different isodesmic reactions. Comparison between the computational results and the experimental values reveals that using methane as reference compound to design isodesmic reaction is able to predict satisfactory results of heats of formation for ortho-substituted nitroaromatic molecules; however, using benzene as reference compound is able to give agreement with experimental data for meta-substituted and para-substituted nitroaromatic molecules.
Analysis of Impact of Moisture Content on Rock Thermal Conductivity Coefficient Using TCS Method
Authors: Yu Zi Wang , Zhang Yan Jun , Gao Ping
Published: March 2015

The coefficient of thermal conductivity scanner (TCS) was used to test granodiorite, sandstone and rhyolite samples, focuses on the changing rule of the thermal conductivity coefficient of rock under different moisture content. The coefficient of thermal conductivity of the rock increases with water content, and follow a linear relationship. The relative thermal conductivity of three kinds of rock sample is: granodiorite higher than sandstone and higher than rhyolite. The higher the structure density at the same time, the smaller the porosity, the stronger the cementation, the higher the strength, the greater the thermal conductivity of rock mass. This conclusion can be used with geothermal energy development, and has certain reference value.
Iron Temperature Field Finite Element Analysis and Measurement Verification
Authors: Sun Hua
Published: March 2015

We often need to be in a work of finite element analysis of temperature field, but for the results of the analysis data, we seldom verified. This article through to the sample temperature field finite element analysis, then experimental measurement, verifies the correctness of the finite element analysis.
Lifetime Estimation of Chain Plates for Floodgates Working in Seawater by Continuum Fatigue-Creep Damage Theory and Transient Analysis of Diffusion Process of Hydrogen
Authors: Jong Mun Chan , Xie Li Yang , Song Hak Jin , Jon Sun Jong , Kim Myong Il , Lv Xiao
Published: March 2015

Lifetime estimation of chain plates made of 45Cr high strength steel for floodgates working in seawater has been performed by considering fatigue-creep crack initiation and hydrogen assisted crack propagation at the plate. According to the records of operating history of the floodgates, average lifetime of the chain plate is in range of 18~22 years. Estimated lifetime of the chain plate by continuum fatigue-creep damage theory and transient analysis of the diffusion process of atomic hydrogen in the metallic lattice is in range of 19~25 years.
Study on Testing Methods for Thermophysical Properties of Materials
Authors: Hu Zhe , Jiang Jin Yong , Lu Gui E , Ge Qiang , Wang Shao Guang , Jia Hao Nan , Zhang Peng
Published: March 2015

This paper introduced the relevant concepts of thermophyscal properties and some methods measuring the parameters of material about thermophyscal properties. Different test methods have their own features and advantages. It should be taken into account that the size and mass of material have great influence on the test method.
Elastic-Plastic Constraints Analysis for Hole-Edge Crack
Authors: Xie Yi  Qin , Wang Zhong Xian , Zhang Yan Qing
Published: March 2015

This paper mainly conducts an elastic-plastic constraint analysis on rectangular plate specimens with hole-edge crack under remote uniaxial uniformly distributed load by using J-A2 elastic-plastic fracture theory. In order to analyze the effect of orifice on elastoplastic stress field of hole-edge crack tip, this paper calculates a series of round hole-edge crack, diamond hole-edge crack and corresponding pure crack models. The interference effects of the orifice shape on elastic-plastic J integral and crack constraint parameter A2 are discussed. The results show that: the orifice has an amplification effect on the fracture driving force (J-integral), and this amplification effect in elastic-plastic is smaller than that in elastic; the orifice has a shielding effect on the crack tip constraint (A2 parameter), and this shielding effect gradually weaken with the crack increasing.
An Experimental Study of Compatibility for Metallic Inserts Bonded into CFRP Laminates Soaked in Aircraft Fuel
Authors: Chen Xue Mei , Liu Jing , Xu Jing , Zhang Hui , He Feng Tao , Hou Kun , Wang Zong Wu
Published: March 2015

CFRP laminates are used for various aircraft structural components because of their good mechanical and physical properties. Metallic inserts are one kind of aerospace fasteners, which are usually installed in the metallic components by an interference fit. However, when metallic inserts are installed in the CFRP laminates by the traditional installing way, delamination and low efficiencies are troublesome. Therefore, excellent quality and cost effective installing metallic inserts into the CFRP laminates remains a challenge. In this paper, a series of experiments were carried out to study the compatibility for metallic inserts bonded into the CFRP laminates soaked in the aircraft fuel. The experimental results show that the push-out values and breakaway torque values of metallic inserts bonded in the CFRP laminates soaked in the fuel are not reduced compared with these values of sample was not prepared in that way.
Investigation on Compression Properties of Syntactic Foam Reinforced by Warp Knitted Spacer Fabric
Authors: Zhi Chao , Long Hai Ru
Published: March 2015

The study aimed to investigate the compression behaviors of syntactic foam reinforced by warp knitted spacer fabric (SF-WKSF). Two kinds of SF-WKSF samples were prepared with warp knitted spacer fabric (WKSF) of different surface layer structures. The compression tests were carried out by MTS 810 material test system and the compression properties of SF-WKSF were analyzed based on its compressive stress–strain curves and modulus values obtained from test results. It is indicated that the surface layer structure of WKSF has significant effects on the compression performance of SF-WKSF, the SF-WKSF made with denser surface layer structure shows higher compressive modulus and yield strength compared to neat syntactic foam (NSF).
The Lightweight Design and Simulation of Hydraulic Steel Gate with Metal Sandwich Construction
Authors: Li Xiang , Tong Guan , Zhou You Hui
Published: March 2015

The paper applies composite technology into the field of hydraulic metal structures and hydropower construction mechanical equipment design, and presents the method of optimum design of hydraulic steel gate metal sandwich construction and simulation analysis. According to characteristics of the structure of the flat hydraulic steel gate and selecting the appropriate metal sandwich construction, this paper optimize the design of a hydraulic steel gate of metal sandwich construction from the perspective of light-weight purpose of structure. Considering the overall mechanical behavior of steel gate structures and using technology of three-dimensional modeling and numerical simulation, this paper has a numerical simulation analysis on the optimum hydraulic steel gate. Numerical simulation analysis and theoretical calculation results show the optimum structure of hydraulic steel gate is reasonably practicable.
Mathematic Model of Liquidus Temperature in Quaternary Aluminum Phase Diagram
Authors: Qiu Ke , Wang Ri Chu , Peng Chao Qun
Published: March 2015

A numerical technique for constructing liquidus temperature in quaternary system has been proposed. This technique offers accurate calculations of solidification temperature and demonstrates on the Al-Si-Mg-Fe system. The thermodynamic data is extracted by calling the TQ-interface (Thermodynamic Calculation Interface) and modeled using efficient computational approaches such as polynomial regression and interpolation. Si and Mg are treated as independent variables in regression functions, while Fe is treated as interpolated variable. The validated accuracy of results obtained through this method is compared with those calculated using Thermo-Calc. This technique is useful for quaternary systems.
Compression Performance of Composite Stiffened Panels with Scarfed Holes and Scarfed Bonded Repairs
Authors: Li Si Qi , Guan Zhi Dong , Nie Heng Chang , Li Zeng Shan , Guo Xia
Published: March 2015

This paper presents the experiment results conducted on three kinds of composite stiffened panels under compressive static load. The panels with scarfed holes and scarfed bonded repairs are analyzed with the virgin panels. The analysis shows that the scarfed bonded repair method has recovered the failure load and the stiffness above those of the virgin panel while the panel with a scarfed hole has remained 70% strength of the virgin panel. The scarfed hole has an effect on the buckling load as well as the stiffness and the failure load.
Loading Tests of Thin Plates Made of Ultra-High Performance Concrete Reinforced by PVA Fibers and 2D Textile Glass Reinforcement
Authors: Tej Petr , Kolisko Jiří , Bouška Petr , Bittner Tomáš , Mušutová Veronika
Published: March 2015

This paper focuses on the research carried out on thin plates made of white ultra-high performance concrete reinforced by PVA fibers and 2D textile glass reinforcement. These boards should be used for facades or roof panels. The paper presents a computer and experimental analysis of the loading of thin UHPC plates. For the purpose of the experiments, three specimens of a size of 750 x 125 x 15 mm were made. The specimens were subsequently tested in the laboratory in four-point bending tests. The paper presents the process and results of the experiments. Simultaneously with the experiments, computer analyses were created in which optimization of the material and geometric parameters of the beams were carried out. The paper demonstrates the correspondence of the experimental and computer-simulated load test results.
Transmission Performance of Water-Based Nano Fluid Based on Computational Fluid Dynamics
Authors: Song Zheng Zheng , Wu Zhang Yong , Mo Zi Yong
Published: March 2015

The nanoboron carbide particle size is 60nm, dispersed in RO reverse osmosis membrane treatment water form water-based nanofluid by adding the dispersant. In experiment, Water-based nanoboron carbide fluid has good resistance sedimentation stability when adding sodium carboxymethyl cellulose as a dispersing agent. Prepared three kinds of water-based nanoboron carbide fluid, the mass fraction of nanoparticles is 0.6%, 0.8%, 1.0%. By establishing a model of U-shaped tube, simulated the water-based nanofluids flow field in U-shaped tube using FLUENT, get velocity flow lines picture and pressure variation graph by CFD post-processing. From simulation results obtained: Water-based nanoboron carbide has good transmission fluid performance when nanoparticles mass fraction of 0.8%.
Microwave Dielectric Properties of (Ca0.8Sr0.2)x(Li0.5Nd0.5)1-xTiO3 Ceramics
Authors: Yang Yun , Yuan Chang Lai , Chen Guo Hua , Peng Fu Wei , Yang Tao
Published: March 2015

Microwave dielectric properties and microstructures have been investigated in the x Ca0.8Sr0.2TiO3 − (1−x) Li0.5Nd0.5TiO3 ceramic system. In the entire composition range, a single solid solution in the ceramic system was formed with the orthorhombic perovskite structure. As the Ca0.8Sr0.2TiO3 content of the ceramic system increased from 0.1 to 0.3, the dielectric constant (εr) increased from 114 to 144, the product (Qf) of quality factor (Q) and frequency (f) from 995 to 1,121 GHz, and the temperature coefficient of resonant frequency (τf) value from-83 to 94 ppm/°C, respectively. Simultaneously, the observed polarizabilities and the theoretical polarizability increased with rise in the Ca0.8Sr0.2TiO3 content. The τf value increased linearly with the increasing unit-cell volume. For practical application, a near-zero τf in the 0.2Ca0.8Sr0.2TiO3 −0.8Li0.5Nd0.5TiO3 ceramic with a Qf value of 1,025 GHz and a εr value of 132 were obtained at the sintering temperature of 1300°C for 4 h.
Ni-Cr-Al Coating Layer Modified by Friction Stir Processing - Analysis of Microstructure and Element Diffusion
Authors: Zhu Li Kui , Zhou Xiao Ping , Fang Ying Ze , Xu Feng
Published: March 2015

Flame thermal spray Ni-Cr-Al coating layer on Q235 steel modified by friction stir processing(FSP) was studied. FSP function area formed a uniform density composite layer, of which internal coating layer formed superfine crystal structure and crystal structure of substrate changed, improved the mechanical properties. The plastic deformation generated by friction stir processing directly influenced the microstructure and mechanical properties. Dynamic recrystallization occurred within a certain range of plastic deformation, temperature and plastic deformation interlocking effect provided advantageous channel to fast element interdiffusion.
Research on the Modification of Water-Borne Inorganic Zinc-Rich Coatings and its Performances
Authors: Chen Liang , Wang Zai Qin , Wei Tao , Xiao Cheng Jing
Published: March 2015

In order to develop more suitable anticorrosive coatings for hydraulic engineering metal structures, studies were carried out on the modification of water-borne inorganic zinc-rich coatings in this paper. Through effective regulation of the type and dosage of various ingredients, such like potassium silicate solution, silicone-acrylate emulsion, zinc powder and additive agent, modified water-borne inorganic zinc-rich coatings equipped with enhanced water and impact resistance were prepared. Coupled with the inherent anti-corrosion and electrochemical protection property, this modified new coating possesses a broader application prospect in hydraulic engineering metal structures.
Study on Macroscopic Morphology, Microstructure and Hardness of F313 Iron-Based Coatings Prepared by Laser Cladding Using Different Powder Feed Rate
Authors: Sun You Zheng , Liu Shuai , Wang Si Yu , Li Jin Bao , Yang Chuan Ning , Hai Ben Rong , Zhang Xiao Rui , LIU C.S.
Published: March 2015

The objective of the present study was to find the influence of powder feed rate on macroscopic morphology, microstructure and hardness of F313 iron-based alloy clad coatings. Controlling powder feed rate can assist with achieving favorable macroscopic morphology, microstructure and hardness. Four different powder feed rate were used in our experiments to prepare clad coatings. The macroscopic morphology, microstructure and hardness were tested using OM, SEM, and Vickers hardness tester. The study founds decreasing powder feed rate is possible to achieve smoother surface, but at the same time thickness of coatings get thinner. Microstructure of cross sections is divided into inter-dendrites eutectic structure and dendritic matrix. In the upper region the microstructure tends to be formed of cellular-like dendrites whereas in the lower region branch-like dendrites tend to form. Hardness decreases with increasing of powder feed rate generally.
A New Hot Stamping Process with Quenching and Partitioning Treatment
Authors: Liu Pei Xing , Yu Xiang Yun , Wang Kai , Zhu Bin , Jian Li , Zhang Yi Sheng
Published: March 2015

A new hot stamping process with quenching and partitioning treatment is proposed in the paper. Compared to direct hot stamping process, the microstructures with some retained austenite not only including martensite are formed according to the constrained carbon equilibrium (CCE) model. During the new hot stamping process, tools with high temperature are used to control the quenching temperature (QT) between Ms and Mf, and the partitioning treatment of the part is also implemented in the tools by prolonging holding times. In this paper, different holding times (partitioning times) controlled by servo press, are used to research the influence of partitioning time on mechanical properties.
Analysis of Microstructure and Mechanical Properties of 2A97T3 Al-Li Alloy Fiber Laser Welding Joint
Authors: Yi Zhen , Chen Li , He En Guang , Chang Ming
Published: March 2015

2A97 Al-Li alloy with good comprehensive performance is a new type of Al-Li alloys in our country,in order to meet the ever-increased long-term requirements of aerospace,aviation and armament industries,microstructure and mechanical properties of 2A97Al-Li alloy fiber laser welding joint were analyzed in this paper.The results show that:2A97 Al-Li alloy laser welding joints from welding fusion line to the center of welding seam are non-dendritic equiaxed grain zone,columnar crystal zone,columnar dendrite zone,equiaxed dendrite zone.Precipitates θ,T2 and T1 are probably exited in FZ,hardness of the center of FZ is the lowest.Yield strength of welding joints are about 70% of base metal,tensile strength are approximately 63% of the base metal.
Application Research of Hot Stamping Base on the Forming History
Authors: Ma Ning , Liu Ke Su , Liu Quan Kun , Ma Yu Jie
Published: March 2015

The hot stamping process and process parameters are investigated for a model of a B-pillar outer plate by numerical simulation. The feasibility of hot stamping forming process and its parameters are analyzed. The effectiveness of numerical simulation and the accuracy of hot stamping forming process and its parameters for B-pillar outer plate are proved by the hot stamping experiment and tensile tests. Three models are designed to analyze the effect of B-pillar in the vehicle side impact. It shows that hot stamping technology has the advantages in the field of lightweight and improving impact resistance. Through the research of the historical process of hot forming part, the residual strain characteristics of hot stamping parts is analyzed, the produce and mechanism of residual strain is explained, and the application method based on the forming history of hot stamping technology is provided.
Experimental Study on Cryogenic Gas Atomization Jet Cooling Difficult-to-Cut Material
Authors: Guan Xiao Yan , Wu Ai Sheng
Published: March 2015

Based on pool film boiling, the model of boiling and vaporization to heat transfer is established When droplet jet into cutting zone to cool high temperature wall. Through the transient experiment of cryogenic gas atomization jet cooling high temperature nickel-base alloys and Titanium alloys surface with different water dose. The water dose achieving the best cooling effect is obtained at different temperature on surface of Nickel based alloys and TI-alloy. It is indicated that the water dose to the best cooling effect must be equivalent to the amount of water that materials can vaporize and participate in the phase change heat transfer under certain temperature. When achieving optimal cooling effect, the amount of droplets participating in phase change heat transfer to cool high temperature wall are the most , while comparing the cold air cooling effect and spraying cooling effect at low and high temperature. Result is that either low or high temperature, spraying cooling effect is superior than cold air cooling effect, but at a specific temperature, no lower the temperature of air, the better cooling effect, there is also an optimal air temperature values.
Experimental Test on Continuous Drying Sintering Apparatus by Heating Roller Type
Authors: Gao Bo , Zhang Xiao Gui , Wang Wu Qi
Published: March 2015

Dry sintering process has the vital significance for the printed electronics function. In order to reduce the production cost, the volume of printing technology will be an inevitable choice. In current laboratory research on dry sintering, the object of the dry sintering is still in the static state. In order to study on the related problem of moving dry sintering object under continuous dry sintering process while the volume of printing technology, to solve problems of the static motionless state, we designed a test apparatus for printing electronic dry sintering. The experimental device was driven by stepping motor, controlled by PLC, temperature controlled by external circulation heat conduction oil, heated by roller drying sintering object. Assembly test results showed that the roller surface temperature was uniform heated by experimental device, and the impact on the uniformity of dry sintering was small. The experimental device could simulate volume of continuous motion state, and also could adapt to the preparation of the shorter sample to save the experiment cost.
Influence of Plasma Torch Nozzle Design on Plasma Arc Analyzed with Finite Element Method
Authors: Wang Hai Yan , Jiang Yi , Xia Yuan Peng , Zhou Yun Li
Published: March 2015

Plasma torch is one of the most important parts for plasma arc generating system. A design of orifices in a nozzle would decide the properties of plasma arc. However, mechanisms of orifice to plasma arc are seldom discussed. In this paper, the plasma arc with two assistant orifices were analyzed by finite element method. It was concluded that the plasma arc would be further compressed in the direction parallel to two assistant orifices, but expand perpendicular to assistant orifices. Through the constriction of two assistant orifices, the shape of the plasma arc would be elliptical other than circular of the oridinary plasma arc. The torch design with two assistant orifices could be available to many fields such as plasma arc welding, especially to a welding torch with a large pressure chamber.
Investigating the Application of Ultrasonic Welding Technology in Waterproof Composites
Authors: Shi Hui , Wang Jian Ping , Zhang Ling Xi , Luo Shun Hua
Published: March 2015

A comprehensive overview of the ultrasonic welding technology is presented in this paper. The main objective is to provide a deeper insight into the application of ultrasonic welding in waterproof composites and to summarize the previous investigations on ultrasonic technology done by a group of researchers. The main focus is put on the material weldability and the influence of welding parameters (amplitude, pressure and speed) on welding quality. Finally, some suggestions have been proposed on the improvement of ultrasonic technology, which has the theoretical guidance significance for future research and application in textile and apparel industry.
Noise Analysis of Diamond Saw Blade
Authors: Zhao Min , Zhang Lin , Tang Bei Ming , Maher Kattan
Published: March 2015

In this paper, noise of diamond circular saw blades has been measured, five different types of saw blades are used to measure their noise under different working condition. By analyzing of the experimental results, the effect of different factors on the saw blade noise is studied. The result shows that the increasing the speed of cutting machine or the diameter of blade, noise will become larger. The noise of saw blade with a hole or water slot would be greater than others without any hole or water slot.
Effect of Diamond Shape on Surface Roughness of Diamond/Cu Composites
Authors: Cui Wei , Ren Shu Bin , Chen Jian Hao , He Xin Bo , Qu Xuan Hui
Published: March 2015

Diamond/copper composites have excellent thermal physical properties and they are usually be grinded and polished to certain roughness before sealing with other materials, in practical engineering applications. This paper studied the effects of different diamond particles on surface roughness of diamond/copper composites. Research results show that under the same grinding conditions, copper-based composites enhanced by broken diamond have smoother surface and higher bending strength; composites enhanced by monocrystalline diamond have the roughest surface and the lowest bending strength. The difference of the roughness and bending strength is attributed to surface morphology of the diamond and the bonding strength between particles and matrix.
Parameters Research of Precise Straightening Process in Roll Straightener
Authors: Chen Qiang , Li Shan , Luo Ying , Lu Wen Long
Published: March 2015

Refined copper to obtain high quality can use the electrolytic method; the copper cathode plate is applied to the electrochemical machining. In order to make copper cathode plate has high flatness, assuring electrolytic cell cathode and anode plate spacing, so that the purity of copper electrolysis precipitation is higher, so change the straightening plate method has become the urgent task of the enterprise. Through the computer simulation, the ANSYS/LS-DYNA computer optimization, analysis precise straightening device parameters, in ensuring the copper starting sheet straightening can meet basic factories requirements, improve the machining precise straightening machine and copper starting sheet straightening efficiency.
Simulation on the Temperature Field of Milling Roller Using Fluent Software
Authors: Wang Min , Zhang Ke Ping , Zhang Feng Wei
Published: March 2015

In order to study the law between the internal coolant flow rate and the temperature of milling roller, the temperature field of water-cooled roller was simulated with Fluent software. The results showed that with the increase of the coolant flow rate, the temperature on roller surface decreased, but after the flow rate of coolant increased to 3.5 kg/s, the temperature of roller maintained invariant almost, so 3.5 kg/s was the best flow rate.
Study on the Microstructure of Thermoforming
Authors: Wu Jin , Guo Hai Quan , Bi Da Sen
Published: March 2015

Thermoforming is a typical process to manufacture ultra-high strength steel sheet in auto industry. 22 MnB5 type is the widely used sheet. This paper uses thermal coupler software Pam-stamp 2011 to simulate the thermoforming of 22 MnB5 steel sheets. Get the temperature field distribution of thermoforming parts and martensite content. In addition, it discusses the thermal forming experiment process. Test the contents of thermoforming parts such as tensile strength, vickers hardness and so on. The experimental results show that in the components of this experiment, the hardness of the side wall is higher than other places. In the analysis of the microstructure, we can see that the thermal forming components are of martensite structure. Seen from the results of the simulation, they are consistent with the data from the experiment.
Research on the Low Cycle Fatigue Properties of PC/ABS Blend
Authors: Ho Ming Hsiung , Wang Pin Ning , Kuo Shun Chi
Published: March 2015

PC/ABS is widely used in the vehicle interior, electronic parts and accessories. The study of low cycle fatigue properties have been performed on injection molded samples of PC/ABS blend. The experimental results indicated that the optimum conditions of the fatigue property are melting temperature 200°C, filling time 6 s, and mold temperature 65°C. There has a transition point in the condition of filling time. When the strain amplitude is higher than 0.0118 mm/mm, filling time 6 second has best fatigue properties. By scanning electron microscopy, near the crack initial area, the mechanics of fracture surface are like short and fine fiber. The surface has long fiber ductile fracture, which far away from crack initial area.
Effect of Electropulsing Rolling on the Microstructure and Properties of Industrial Pure Titanium TA1
Authors: An Xing Zhou , Xu Chun , Guo Yan Hui
Published: March 2015

The microstructure and properties of industrial pure titanium TA1 produced by warm rolling and electropulsing rolling were studied and compared in this paper. The results show that both elongation and strength improve after warm rolling, and the elongation of electropulsing rolled TA1 improves significantly and the strength reduces compared to warm rolled TA1. The microstructure after warm rolling shows elongated grains with high density of dislocation. However, after electropulsing rolling, microstructure is much finer, shows some fine grains and sub-grains with lower density of dislocations. The pole figure results show that sharp {0002} basal texture form in electropulsing rolled TA1, and the maximum texture component deviate from{0002} basal texture in warm rolled TA1.
The Influence of Strain Rate on the Springback of Commercially Pure Titanium in a Stretch Forming Operation
Authors: Leacock Alan G. , Quinn Shane , Volk Gregor , McCracken David , Brown Desmond
Published: March 2015

A common processing stress state used in the construction of sheet metal components is that of uniaxial tension/stretching. This work examines the stretching of CP-Ti over a rigid form tool using varying degrees of strain and strain rate. The degree of springback is shown to be influenced by the interaction of strain rate, strain magnitude and time following forming.
Use of FE Simulation and Servo Press Capabilities in Forming of AHSS and Aluminum Alloys
Authors: Fallahiarezoodar Ali , Ju Long , Altan Taylan
Published: March 2015

Production of light weight and crash resistant vehicles require extensive use of AHSS (DP,TRIP,TWIP) and Al alloys to form complex shapes. This paper discusses practical determination of material properties and selection of lubricants for forming AHSS using a die set, designed for deep drawing. Tests were conducted in a 300 ton servo press. Thinning at the critical area of the formed part were measured and compared with FE simulation. Prediction of temperatures in deep drawing of selected DP steels and Al alloys in servo press is also discussed.
Formability Enhancement in Incremental Forming for an Automotive Aluminium Alloy Using Laser Assisted Incremental Forming
Authors: Mohammadi Amirahmad , Vanhove Hans , van Bael Albert , Weise Dieter , Duflou Joost R.
Published: March 2015

The aim of this study is to establish general guidelines for minimizing the number of tests required to determine optimum process parameters in terms of formability for laser assisted single point incremental forming (LASPIF). An automotive aluminium alloy (AA5182-O) is selected and the room temperature failure angle of this material is determined experimentally. The straining behaviour as well as sheet thinning of the test part (at its maximum forming angle) is studied using an experimentally validated finite element model. From the thinning rate of the sheet metal and the shape of the contact zone between tool and sheet it is concluded that continuous straining of the sheet on the wall region of the contact area is responsible for extra thinning and failure. Based on the size and position of the contact zone, different laser tool positioning strategies have been used to achieve the highest forming angle. It is concluded that due to an elongated shape of the contact zone in steep wall angle parts and considering a small deviation of the forming robot, the selection of a large spot diameter is necessary in terms of maximum obtainable wall angle. It has been observed that the maximum forming angle is still achievable using a large forward offset. It is concluded that the partial stress-relief annealing of the deformed geometry during the approach of the forming tool, is responsible for this formability enhancement.