bluuebunny/crossref_metadata_2025 huggingface dataset:
Impact of Composite Mineral Admixture on Carbonization Resistance of High Performance Concrete
Authors: Wang Yuan Gang , Ma Peng , Huang Kai Jian , Zhang Gao Qin , Hu Ya Feng
Published: March 2015

Fly ash, silica fume and ground steel slag are chosen to make up composite mineral admixtures. Through the orthogonal test, carbonization resistance property of High Performance Concrete (HPC) mixed with composite mineral admixtures is studied. Test results show that the carbonization resistance property of HPC can be improved with defined amount of composite mineral admixture mixed, in addition, the effect of ternary composite admixture of ground steel slag, fly ash and silica fume is more obvious than that of binary composite admixture.
Inversion of Material Parameters of Composite Fiberglass Box Structure
Authors: Chen Hui , Wang Feng , Liu Hua , Zhang Jian
Published: March 2015

For composite fiberglass box structure, the approximation equations of Kalman filtering processor was studied. The necessary observation revision equation and Kalman regenerative matrix were derived. The determinations of the initial values of material parameters and the error covariance matrix were solved. The Kalman filtering steps of material parameters of composite fiberglass box structure were presented and the analytical procedure was compiled. From results of typical examples, it is indicated that the Kalman filtering processes are steady and convergent to the true values when the initial filtering values are properly selected, which demonstrates that the analytical method is correct and the developed procedure are reliable. The Kalman filtering processes of material parameters are quite dependent on the determination of initial filtering values, which indicates that the initial filtering values should be set with practical engineering experiences instead of arbitrary selection.
Nonlinear Structural Analysis of Fire-Exposed Reinforced Concrete Column
Authors: Liu Li Xian , Lv Long , Zhao Yan Feng
Published: March 2015

A nonlinear structural analysis is presented for reinforced concrete (RC) columns exposed to fire. The analysis includes two steps: the first step is the calculation of the temperature distribution in concrete members, and the second the determination of the mechanical response due to elevated temperature and applied loading. In the thermal analysis, the effect of moisture is taken into account. The use of the computer program for evaluating the response of a RC column from the initial preloading stage to collapse, due to fire, is illustrated. The validity of the numerical model used in the program is verified by comparing the predictions from the computer program with measured results from full-scale fire resistance tests. The computer program can be used to predict the fire resistance of RC columns for any values of the significant parameters, such as load level, section dimensions, column length, concrete strength, concrete cover, aggregate type and reinforcement ratio.
Investigation of the Surface Modification on Biomedical Magnesium Alloy
Authors: Xu You Dong , Xiong Jian Qing , Xu Shi Guang , Zhang Jun Jun
Published: March 2015

In this work, the green chemistry conversion coating on AZ31 magnesium alloy surface was made and studied by means of Ce (SO4)2·2(NH4)2SO4·4H2O and MnSO4 as inhibitor, H2O2 as oxidant, NaCl as accelerator, CH3COOH as stabilizer. The coating was evaluated in simulated body fluid (SBF) with pH=7.4 at 37°C by using electrochemical impedance spectroscopy (EIS). The results show the conversion coating resistance, for the untreated or treated alloy, is 0.75 kΩ·cm2 and 3.28 kΩ·cm2 respectively. It indicates the conversion coating treated surface presents better corrosion behaviour in SBF than the original material surface. The morphologies and composition the coating were examined by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS) respectively. The result indicates that the Ce-Mn conversion coating was made on magnesium alloy surface. Biocompatibility of conversion coating was investigated by use of cell toxicity. Cell culture has shown that the magnesium alloy has good cytocompatibility.
Nonenzymatic Glucose Electrochemical Oxidation Based on Pt Decorated MWCNTs-PVA Hybrid Electrode
Authors: Liu Shu Min , Zheng Yu Dong , Cui Li Ying , Zhao Chang Kai , Xiao Yu , Zhang Tao , Yue Li Na , Chen Jia
Published: March 2015

The multi-walled carbon nanotubes (MWCNTs) /polyvinyl alcohol (PVA) coating may have excellent biocompatibility and unique electrical properties. The effect of the dispersing agent on the electrochemical behaviors is very relevant,which has a great influence on the ionic conductivity of the composite material.We prepared four membrane electrodes of MWCNTs by using two dispersing processes of electrophoretic deposition (EPD). The scanning electron microscope (SEM) graphs of the MWCNTs/PVA composite were recorded In the NaOH solution, glucose is electrochemically oxidized on the acidified-MWCNTs/ PVA composite coating with high current density. The MWCNTs of the covalent dispersing methods treatment have a positive influence for the oxidation of glucose. The PVA can strengthen the dispersion effect of CTAB-MWCNTs for the EDP. The cooperative electrocatalytic property of MWCNTs-Pt toward glucose is not impaired by the association with the PVA binder.
Analysis of the Geometry and Microcracks of Kevlar/Epoxy Composites
Authors: Mušutova Veronika , Tej Petr , Kolisko Jiří , Černý Miroslav
Published: March 2015

This paper is concerned with the evaluation of the parameters of plain weave textile from Kevlar 49 fibers. They were determined following the basic parameters of the textiles e.g. crimp length, crimp amplitude, thickness of the woven fabric, dimensions of the cross-sectional tow (tow width, tow height) and crimp angle. The number of fibers in the warp and tow strands was also determined.The work is also concerned with the analysis of microcracks in the material, that is, microcracks that appeared after the tensile test. Microscopic observation of cracks occurred on the test specimen strip according to DIN EN ISO 14129 for tensile testing. Strips of the material were cut, the metallurgical methods used being kept perpendicular to the thickness of the test specimen. Microcracks occurred in the individual planes located in the chosen reference axis. Microcracks were detected in the entire width of the specimen. The types of microcracks were determined by the length and traits of the microcracks.
Flexible Graphene Paper as a Binder-Free Anode Material for Lithium Ion Batteries
Authors: Yang Chuan Ning , Qing Yong Quan , Liu Chang Sheng
Published: March 2015

Graphene paper (GP) with layered structure and highly conductive network is fabricated by a facile technique of vacuum filtration and studied as a single-component and binder-free anode of lithium ion batteries (LIBs). The process of fabrication of GP without any binder and high-temperature treatment, in the meantime, great improvement in both the capacity and cycling performance of the GP electrodes have compared with other kinds of traditional graphite electrode materials. Given the simplifying anode fabrication, low manufacturing costs and many electrochemical properties of the GP anode, it is regarded as an excellent anode material of LIB with great promise for its both excellent cycling performance and electrochemical properties. The specific capacity can reach to over 200 mAhg-1 after 60 charge-discharge cycles under the current rate of 50 mAg-1.
Highly Selective Separation and Enrichment of Phosphopeptides by Uranyl-Salophen Immobilized Silica Gel Material
Authors: Xu Can Hui , Zhang Guang Liang , Zhou Xin , Xiao Xi Lin , Nie Chang Ming , Liao Li Fu
Published: March 2015

The characterization of phosphoproteins requires highly specific methods for the separation and enrichment of phosphopeptides. Here we report a novel metal ion-immobilized solid phase material for the separation and enrichment of phosphopeptides. The material is uranyl-salophen-silica gel (USSG) particles in which salophen is a tetradentate ligand of uranyl ion. In USSG salophen is connected on the surface of silica gel and uranyl is bound on the surface through its coordination with salophen. Phosphopeptides can be selectively retained by USSG because uranyl-salophen can bind phosphate moiety with strong affinity and high selectivity. The new material USSG has been successfully used for the separation of phosphopeptides from peptide mixtures with the separation efficiency of 97.0% to 97.4%.
Sorption of Pb(II) on Iron Hydroxide Modified Diatomite
Authors: Wang Ying , Lu Yi Feng , Jiang Yong , Ma Lan , Ma Li Juan , Wang Meng Yun
Published: March 2015

Fe-diatomite was prepared and applied for the sorption of Pb (II) from aqueous solution. The samples before and after modification were characterized by SEM and XRF. The results showed that iron hydroxide compound has been successfully loaded at the diatomite. Lead adsorption characteristics were studied in a batch system with respect to changes in initial concentration of lead, pH of solution, adsorbent dosage and temperature. It showed that the removal rate increased with pH, adsorbent additive amount, the temperature and decreased with the initial concentration.
Synthesis and Application of the Three-Component Lyotropic Liquid Crystal
Authors: Yang Qiu Li , Guan Xin Ran , Xie Xiao Na , Wei Shao Wei , Fang Yi Wen
Published: March 2015

This paper focused on synthesizing the surfactant lyotropic liquid crystals (LLCs) through mixing the coconut diethanol amide (6501), primary alcobol ethoxylate (AEO9) and water. The LLCs phases formed in the ternary system are thoroughly investigated by polarized optical microscopy (POM). The obtained LLCs were characterized by XRD and SEM in order to analysis the texture, structure and the transformation. In addition, the LLCs have been applied in the preparation of TiO2 nanoparticles in our research. The obtained TiO2 powder were characterized by XRD and SEM, more importantly, the results showed that the LLCs are effective in the process of synthesizing TiO2 nanoparticles.
Modeling and Simulation for Current-Illumination Characteristics of Carbon Nanotube
Authors: Pei Yang Jun , Bai Jun Jie , Xu Di Jian , Wu Ying , Zhang Xiao Yun
Published: March 2015

According to the electronic structure characteristic of carbon nanotube (CNT) together with the corpuscular property and volatility of transport electron, the theoretical model of current-illumination characteristic of CNT was researched. The I-V characteristic of CNT was emulation calculated based on ATK modeling software. The electromagnetic scattering model and electromagnetic simulation of the CNT current-illumination absorptive character were researched on account of current-illumination characteristic of CNT discussed by classical electromagnetic theory. The simulation results indicate that, the electric current passed in CNT and the voltage at two sides of electrode have linear relation when 0-2v voltage is put on the Cu electrode of the two sides of CNT. When the voltage is above a certain number, the electric current reaches saturation. The Ti-Ti combination of electrode gets the maximum absorption power when it reaches the height of 300nm.
Conversion of Chitosan into 5-Hydroxymethylfurfural via Hydrothermal Synthesis
Authors: Feng Jia  Xuan , Zang Hong Jun , Yan Qing , Li Ming Gaung , Cheng Bo Wen
Published: March 2015

5-hydroxymethylfurfural (5-HMF) was produced from chitosan by a simple one-pot reaction including hydrolysis and dehydration in the presence of various ionic liquids and Lewis acids. Optimization of the reaction parameters including the screening of different catalysts, the effects of reaction time, temperature was investigated. The optimal reaction conditions are found to be 5 wt.% 1-butyl-3-methylimidazolium hydrogen sulfate ([BMIM][HSO4] ) aqueous solution and 100 mol% AlCl3•6H2O as cooperating catalyst, at 180 °C for 5 h under hydrothermal condition. HMF can be obtained in 25.2 % yield. More importantly, the catalysts can be recycled and exhibited constant activity for 5 successive trials.
Effect of Surface Treatment on the Stress Corrosion Cracking of 304 Austenitic Stainless Steels in Acid Chloride Solution
Authors: Huang Liu Yi , Li Si Hai , Zhu Huai Qiu , Cheng Dong Yue , Zhang Fang Fang
Published: March 2015

A slow strain rate tensile (SSRT) test was used to investigate the effect of laser shock peening (LSP) on stress corrosion cracking (SCC) behavior of the 304 austenitic stainless steels (ASSs) in acid chloride solution. Mechanical properties and fracture morphology evolutions of the 304 ASSs were studied as a function of the pulse energies through slow speed tensile tester and scanning electron microscopy (SEM). The results showed that the percentage elongation after fracture increased significantly as the pulse energy rose. Fractographic examination revealed that all the samples appeared a tendency to SCC in the given conditions, but specimens treated by LSP had better resistance to stress corrosion.
Strength Testing of Fabric Composite Material and Impact Simulation for Airbag Landing System
Authors: Wei Jian Zheng , Tan Hui Feng , Song Bo , Wan Zhi Min
Published: March 2015

The “Orion crew exploration vehicle” of NASA takes airbag as one way of landing system, which can reduce the landing weight, maintain the reposefully landing of the vehicle, protect the detector during recycling. In this paper, taking into account the material quality and the change during soft-landing of the airbag, the tensile mechanical properties tests of plain weave composite material airbag have been conducted at different temperature and different silicone coating thickness. Based on the material parameters of the test, the finite element model has been created to obtain the inner pressure and the overload curve of the airbag which has a certain angle with the ground. The result shows that the airbag made of fabric composite material can realize the landing and recycling of the vehicle.
Study of Influence Factors on Medium-Density Fiberboard Thermal Analysis
Authors: Liu Ling , Xing Zheng , Liu Yi Xiang , Yi Hua
Published: March 2015

The main influence factors on thermal analysis of medium-density fiberboard (MDF) was analyzed by thermo-gravimetry (TG) and derivative thermo-gravimetry (DTG) , which are heating rate, atmosphere and sample . Results showed that heating rate affected the thermo-decomposition obviously, while the effect on the residual charcoal was small, The results can provide reference to extinguishment and fire investigation.
Non-Linear Finite Element Analysis on Rubber O-Sealing Ring of SRM
Authors: Chen Jia Zhao , Huang Min Xiang , Wang Xue Ren
Published: March 2015

ABAQUS was utilized to establish a three-dimensional simplified model for rubber O-sealing ring and simulate the mechanical state and deformation in working condition. The influence of medium pressures and compression ratios on the mechanical state were analyzed. The results show that both the maximum Von Mises stress and contact pressure of rubber ring increase as the medium pressure or compression ratio increases, so, larger compression ratio, without causing residual deformation, should be chosen. Based on the failure mode of SRM sealing structure, the failure criteria of the maximum contact stress and shear stress of rubber O-sealing ring were studied.
Preparation Method and Device of Microcellular Sheet Based on Batch Foaming
Authors: Xiao Xin , He Xue Tao , Ding Yu Mei , Qin Liu , Yang Wei Min
Published: March 2015

This paper mainly introduces a new method of preparation of microcellular material, this method can be divided into three stages: kettle with saturation pressure, heating foaming, flattening and calendaring. During the process of supercritical CO2 saturated, different materials need reasonable control parameters such as saturation pressure, saturation temperature and saturated time, and the values of saturation temperature and saturation pressure will directly affect the permeability of supercritical CO2. During the process of heating foaming, it needs to strictly control the parameters such as foaming temperature and foaming time, because the bubble density and bubble size are closely related to the two parameters. During flattening and calendaring process, it is important to control temperature and speed of roller reasonably to avoid the phenomena of collapse in bubbles. There are no harmful substances emissions using this method to produce ultrathin microcellular material, which can also protect the environment.
The Effect of Laser Power Density on Laser Covered Graphene
Authors: Hai Ben Rong , Guo Kuai Kuai , LIU C.S.
Published: March 2015

Laser reduction is a facile method for the synthesis of laser converted graphene from graphite oxide (GO) The laser power density of semiconductor laser can effect on the reduced graphene quality. The research on relationship between laser power density and reduction of graphene oxide can help to determine the optimum technology parameter in the synthesis of laser covered graphene.
Study on Dispersion and Rheology of Particles in Water-Based Nano TiN Fluid
Authors: Ouyang Xin Wang , Wu Zhang Yong , Mo Zi Yong
Published: March 2015

The water-based nanoTiN fluids were prepared by nanoTiN particles, dispersion medium and dispersant using a two-step method. The dispersion and rheology of nanoparticles in water-based fluid were studied under different preparation conditions. The dispersion and rheology of prepared nanoTiN fluids were evaluated and analyzed from the mass fraction of nanoparticles, mass fraction of dispersant and type of dispersion medium respectively by using the analysis of sedimentation stability and rheological properties. The results show that the above-mentioned factors all have different degree of influence on nanofluids’ dispersion and rheology. The viscosity of nanofluids increases with mass fraction of nanoparticles. A balance amount of mass fraction of dispersant will improve nanofluids’ dispersity and fluidity. The dispersion effect of deionized water is the best when the nanoparticles dispersed in different dispersion medium.
Research and Application of Model Materials Based on Soft Rock Model Test
Authors: Yang Jin Chao , Song Bi Hong , Chen Qing , Yang Wei , Chen Jian Hua
Published: March 2015

In consideration of few researches on model materials of soft rock tunnel model test, and the problems such as high price of raw material, difficult availability of materials in market, and weak universality existing in the materials which can be used as reference, this paper researches and develops the model materials with low price, wide source, and strong universality. The application result shows that the developed model materials can meet soft rock model test requirements, and they can be reused within 3 months.
Erosion Study of Silica Phenolic Nozzles with Graphite Inserts in Solid Rocket Motors
Authors: Chen Xiong , Liu Rui , Du Hong Ying
Published: March 2015

Experimental and theoretical studies on the erosion of silica phenolic nozzles with graphite inserts in solid rocket motors were carried out. Two identical segmented nozzles, consisting of graphite inserts and silica phenolic insulation in the convergent and divergent sections, were tested at same operating condition. Due to the different thermal resistance ability, steps are formed at the interface of two materials. The erosion rates, following the distribution of Reynolds number, exhibit an upward trend in the convergent section and decrease in the divergent section for both silicon phenolic and graphite. At high temperature, the graphite erosion rate is limited by the diffusion rate of the oxidizing species,while the erosion rate is limited by the chemical kinetics at low temperature. For the graphite nozzle insert, a switch from kinetics mechanism to diffusion mechanism occurs in the convergent section during the firing test.
A Comparison of the Complex Wettability between Locust and Moth Wing
Authors: Sun Gang , Fang Yan
Published: March 2015

The microstructure, hydrophobicity and chemical composition of the locust and moth wing surfaces were investigated by a scanning electron microscope (SEM), a contact angle meter and a Fourier transform infrared spectrometer (FT-IR). The hydrophobicity models were established on the basis of the Cassie-Baxter equation. The locust and moth wing surfaces are composed of naturally hydrophobic materials, but exhibit different complex wettability. The locust wing surface is of extremely high adhesion (sliding angle>180°) and superhydrophobicity (contact angle 151.5~157.3°), while the moth wing surface is of low adhesion (sliding angle 1~3°) and superhydrophobicity (contact angle 150.5~155.6°). The complex wettability of the wing surfaces ascribes to the cooperative effect of material element and structural element. The locust and moth wings can be potentially used as biomimetic templates for design and preparation of novel functional interface and no-loss microfluidic transport channels.
Microstructures and Mechanical Properties of Aluminum Coating Produced by Friction Stir Processing
Authors: Fang Ying Ze , Zhou Xiao Ping , Xu Feng
Published: March 2015

This Four passes processing to the thermal spray aluminum coating on the aluminum alloy surface,based on friction stir processing (FSP). Applications SEM, EDS and micro hardness testing to analysis the coatings that have been processed and haven't been processed. The results show that , after the friction stir processing,dense ultrafine grained aluminum with the sizes less than 200nm is obtain ,and replace original laminated and porous coating . Fusion utilizes between the coating and the substrate, the gap between coating and substrate have disappear. The alloy elements in the substrate diffuse to the coating.
β-Cyclodextrin Modified Hybrid Magnetic Nanoparticles as an Adsorbent for Phenol Removal
Authors: Cai Song Tao , Zhou Mi , Qian Xin
Published: March 2015

β-cyclodextrin modified hybrid magnetic nanoparticles (Fe3O4@SiO2-h-PAMAM-CD) with a core-shell structure were prepared via the classic hyperbranched polyamidoamine synthesis method, the combination of Michael addition and aminolysis reaction, on the surfaces of silica coated iron oxide nanoparticles. The novel structure was confirmed by fourier transform infrared spectra (FT-IR), Transmission electron microscopy (TEM), and thermogravimetric analysis (TGA), and the superior magnetic property was maintained and helped the material to separation and recycling. Further more, Fe3O4@SiO2-h-PAMAM-CD demonstrated excellent recycling and adsorption capacity for small molecule phenol in the aqueous solution.
The Effect of Scanning Power on AISI 434L Stainless Steel-Based Composite Laser Cladding Coatings
Authors: Wang Si Yu , Sun You Zheng , Li Jin Bao , Guo Kuai Kuai , Hai Ben Rong , Yang Chuan Ning , LIU C.S.
Published: March 2015

In this experiment, several coatings, which were used 434L ferrite stainless steel powders and B4C powders as raw material, were prepared under different laser scanning power. The samples of the coatings were detected by XRD and EDS, and observed by OM and SEM. The results are shown as follow: when laser scanning power is 1800W, the cladding layer contains FeB and CrB6, as scanning power increasing, these two phases disappear in cladding layer, and Fe2B and CrB are detected in the layer. Fe2B, CrFeB, (Cr Fe)7C3, Fe-Cr solid solution are found in all samples no matter which laser scanning power are changed to prepare cladding layers The morphology of phases rich boron and carbon transform from an irregular layer-like shape to a cycle-like or a bar-like one with the scanning power increasing.
The Influence of CTAB Surfactant on the Dispersion of Al2O3 Particles and Deposition Rate of Electroless Ni-P-Al2O3 Coatings
Authors: Liu Da Yong , Yu Jie
Published: March 2015

In this paper, electroless Ni-P-Al2O3 coatings have been synthesized on mild steel shaft by adding various concentration of cetyltrimethyle ammonium bromide (CTAB) into plating baths. Compared with Polyvinyl pyrrolidone (PVPk30), cationic surfactant CTAB shows better effect in dispersing the Al2O3 particles. With the increasing of CTAB concentration in the plating baths, dispersion of Al2O3 particles in the Ni-P-Al2O3 coatings was improved due to high electrostatic repulsive force between Al2O3 particles and CTAB molecular, whereas deposition rate of the Ni-P-Al2O3 coatings was decreased.
The Morphology in Film of Polystyrene-b-Polylactide after Temperature Annealing Process
Authors: Chen Ting , Zhang Jia Nan
Published: March 2015

Polystyrene-b-Polylactide (PS-b-PLA) was dissolved in chlorobenzene, and the development of the micro-phase separation morphology in asymmetric PS-b-PLA thin films was investigated by AFM. The thin films were prepared by spinning casting at the speed of 6000 r/min for 60s on Si substrates. We get different morphologies of PS-b-PLA thin film by changing the annealing temperature from 150 °C to 170 °C. In addition, the annealing time influences the morphology of the film. When the annealing time increased from 2 hours to 15 hours and 30 hours, the morphology transformed from parallel to perpendicular to the substrate. By applying temperature gradients, we can control the morphology and orientation of the Block copolymer film self-assembly.
Study on Wear Mechanism of an AlSi–Hexagonal Boron Nitride Abradable Seal Coating
Authors: Liu Tong , Yu Yue Guang , Shen Jie , Liu Jian Ming , Lu Qiu Yuan
Published: March 2015

To improve gas turbine performance, it is essential to decrease back flow gases in the high-temperature combustion region of turbo machine by reducing the shroud/rotor gap. An abradable seal coating will function effectively. Therefore, it is significant to identify and characterize the main wear mechanisms occurring on turbo machinery seals. A high temperature and speed test rig has been developed by BGRIMM for testing the AlSi–hBN abradable seal coating and Ti-6Al-4V dummy blade. Impact velocities between 150 and 300m·s-1 and incursion rates between 5.0 and 480 μm·s-1 have been applied. It was found that incursion rate has a greater impact on the wear mechanism of the AlSi–hBN coating, with tests at low incursion rate showing a obvious grooving and little micro-rupture, whereas tests at high incursion rate showing significant cutting and adhesion. The present work also shown that tests at low incursion rate related to a higher IDR, which means that blade suffered a serious wear. The investigation together with SEM and XRD analysis on the coating revealed both wear and adhesion occurred at the end of the test.
Structure and Field Emission Properties of CNx Powders Synthesized by a Polymerization Process
Authors: Zhai Chun Xue , Zhao Li Li , Zhang Zhi Yong , Zhao Wu
Published: March 2015

The CNx powders were prepared by a polymerization process. The phase structure and bonding structure of the as-prepared powder were analyzed by X–ray diffraction and X–ray photoelectron spectroscopy, respectively. To prepare CNx field emission cathode, the CNx powders were coated onto Ti substrate using a suspension sedimentation method, followed by an annealing treatment to form a TiC phase. A three layer (Ti substrate–TiC joint network–CNx particles) structure model was proposed to explain the electron field emission properties for the as-prepared field emission cathode. The field emission measurement shows that for the as-prepared CNx cathode, the threshold electric field is 2.04 V/μm and the emission current density at 3.73 V/μm is 158 μA/cm.
The Preparation of ZrO2 and the Influence of the Calcination Temperature
Authors: Zhu Yan , Zhang Xiao , Yuan Shuai
Published: March 2015

nanoZrO2 ceramic powders have excellent properties in many field. In order to obtain nanoZrO2 powder with excellent properties, the study of preparation methods become a hotspot. The nanoZrO2 powders new preparation technology from cheap raw materials is target of this paper. nanoZrO2 powers were preparated from ZrOCl2 and NaCO3 as raw material. The optimum technology parameters were determined as follow, namely at 40°C, C (ZrOCl2) =0.4mol/L, C (NaCO3) =1.0mol/L, 2% the surface activity agent. nanoZrO2 powders preparated were characterized by XRD, TEM and Electron Diffraction . The results show that the ZrO2 powders prepared are crystal and the sizes are nanometer. The ZrO2 average sizes were calculated with the scherrer formula. The nanoZrO2 sizes change with temperature was discussed. The result is ageerment with that calculated with the scherrer formula.
Calculation Method of Laser Spot Coincidence Degree of Laser Micro Machining
Authors: Yao Feng Long , Guo Li Bin , Duan Yun Fei , Guo Meng
Published: March 2015

Laser micro machining is one of modern precision machining methods, which has significance on the modern manufacturing. The solid-state pulse laser (YAG) is processed by overlapped laser spots to remove material from a surface. Through studying the single pit with single pulse laser, the paper proposes two parts-melted part and molten pool and three parameters to describe single pit topography. Meanwhile it puts forwards the relation of the coincidence degree and the feed rate of the worktable, because the single pit model is the basic unit of convex and concave topography, affected by pulsed spot coincidence degree, and the coincidence degree is directly determined by the worktable feed rate, therefore it derives the relationship between the spot coincidence degree and the worktable feed rate. Using the scanning electron microscope (SEM) to photograph the machined surface, it verifies the correctness of the model of the coincidence degree and the worktable feed rate.
Comparison of Stress Filed and Deformation of MAG and TIG for Cr13 Based on Finite Element
Authors: Mao Yun Xian , Yang Meng Qi , Yue Hai Rui , Yang Hui , Li Z.G. , Zhang Ya Zhi
Published: March 2015

This paper took flat butt joint based on Cr13 as a sample, in which TIG and MAG were adopted respectively, and analyzed qualitatively the simulation results of temperature field, stress field and deformation distribution by the finite element analysis software ANSYS. The simulating results indicate that residual transverse press stress plays a dominant role near the beginning and the end of the welding seam, that residual longitudinal pull stress is dominant in the other region of welding seam. The residual stress of MAG is higher than that of TIG. Nevertheless, the deformation of MAG is lower than that of TIG.
Development and Application of Process Control System to the Pilot Hot Rolling Mill
Authors: Jiao Zhi Jie , He Chun Yu , Liu Min , Li Jian Ping , Gao Yang
Published: March 2015

Pilot hot rolling mill is developed with perfect measuring devices and automation system. The hot rolling experimental studies of the plate and strip can be done on this mill. Automation system for this pilot mill is composed with Basic Automation System (BAS), Process Control System (PCS) and Human Machine Interface system (HMI). PC server is used as the PCS hardware, and Microsoft software is used as the operation system and developing software. With the coordination of the functions such as date communication, process tracking, data management, and model calculation, the PCS software function is realized. The effect on the model calculation accuracy with the pilot mill using condition was analyzed. This pilot hot rolling mill gets a lot of application. The practical application shows that the PCS’s setup has a high precision.
Development and Research of Pressing Technology of Billets in New Design of Equal Channel Step Matrix
Authors: Lezhnev Sergey N. , Naizabekov Abdrakhman B. , Panin Evgeniy , Tolkushkin A.O.
Published: March 2015

Performed a simulation of pressing process of the billet in new designed equal channel step matrix. Made a comparison of the deformation loads and distribution of accumulated strain in the billets, deformed in the proposed and previously known tools. Also investigated forming of the front end of the billets to determine the degree of sharpening of the end sections. Studied the influence of multi-cycle deformation process of billets in equal channel step matrix of a new design on the microstructure and mechanical properties.
Effect of Deformation Temperature on Microstructure Evolution for 20CrMnTiH Steel during Hot Compression
Authors: Feng Wei , Wu Shu Ting
Published: March 2015

The hot compressive experiments of 20CrMnTiH steel were performed on Gleeble-3500 thermo-simulation machine. The dynamic recrystallization mathematical models were developed based on experimental data. The effect laws of the deformation temperature on the microstructure evolution of 20CrMnTiH steel were investigated by coupling finite element method (FEM) with the developed dynamic recrystallization mathematical models. The results show that the dynamic recrystallization and the average grain sizes increased with the increasing deformation temperature and the higher deformation temperature is instrumental to dynamic recrystallization. The average grain size simulated using FE model agree well with the corresponding experimental results.
Grafting Polypropylene under Ultrasonic in Water Suspension System
Authors: Zhang Shuang , Zhu Bao Dong , Meng Qing Ming , Li Na , Wang Jian
Published: March 2015

Polypropylene (PP) was grafted with styrene (ST), maleic anhydride (MAH) and butyl acrylate (BA) by free radical thermal initiation leading to (PP-g-PSMB) in water suspension system. The effects of ultrasonic frequency and time were investigated on PP grafting ratio in swelling stage. The structure of grafted product was analyzed by FTIR and melt flow rate (MFR), die swell ratio (Dr) and water contact angles of the grafted product were tested. The results show that the grafting ratio of PP can be improved in a short time by using ultrasonic significantly. The grafting ratio of PP increased with the increase of ultrasonic frequency. Ternary-monomer was grafted onto the PP chain branching in the form of long chain uniformly. The surface polarity of the grafted product was improved significantly.
Numerical Simulation of Distortion of Rectangular Tube with Multi-Point Stretch Bending
Authors: Chen Xian Feng , Peng He Li , Yuan Yong
Published: March 2015

The concept of multi-point stretch bending of rectangular tube is ​​proposed, and the FEM of rectangular tube with multi-point stretch bending is set up. The phenomenon of section distortion of rectangular tube generated by stretch bending is analyzed. The feasibility of integral die repalced by multi-point die used for stretch bending of rectangular tube is proved by comparing the section distortion value. Numerical simulation of distortion value of rectangular tube with different materials, bending radius and thickness are carried out through mutli-point stretch bending, the results show that the larger the yield strength of rectangular tube is or the larger the bending radius is or the thicker the rectangular tube is, the smaller the distortion value of rectangular tube will be. Then the method of filling pressure is applied to decrease the distortion of rectangular tube, and the results shows that larger the filling pressure is, the smaller the distortion value will be.
Numerical Simulation of the Dynamic Stress Field Based on DEFORM in the Friction Stir Welding of Al Alloy
Authors: Zhang Zhong Ke , Peng Jun , Wang Xi Jing
Published: March 2015

Friction stir welding (FSW) was a new solid-state metal-joining method and force played an important role in the weld forming. The study of dynamic stress field helped to understand the forming mechanism of FSW and residual stress after welding. Regarding FSW of aluminum alloy, this paper built the finite element model which was based on DEFORM-3D software and achieved numerical simulation of the dynamic stress field in the FSW process. The results indicate that the peak of stress field appeares in the front side of weld and distributed asymmetrically along the center of the weld; the axial force playes an important role to the distribution of stress field, the the distribution of stress field becomes more intensive as the downforce largen; the stress gradient of the advancing side of weld changes larger than that of the retreating side; the stress near the shoulder experiences twice peak.
A Study on Mechanical and Fatigue Properties of a Stainless Steel
Authors: Zhao Jun Tian , Zuo Yan Rui , Zhao Wei Ping
Published: March 2015

With times of tensile tests, the tensile behavior of a kind of stainless steel at room temperature was determined. According to the results of tensile tests, some parameters of mechanical properties of the stainless steel can be obtained. Fatigue crack expansion of COD stainless steel specimens at room temperature can be simulated with the finite element software extensions.
Pass Design and Finite Element Simulation for Trapezoidal Stainless Steel Sieve Bar
Authors: Wang Ya Qin , Liu Rui , Pan Lu
Published: March 2015

According to a company’s trapezoidal stainless steel sieve bar specification, 4-stands pass system and rolling program are proposed. To verify the pass system, 4-stands sieve bar three-dimensional finite element model is established and simulated by ANSYS/LS-DYNA. Parameters, such as metal flow law (metal longitudinal flow, metal lateral flow) and power parameters (stress, strain and rolling force), are obtained, and provide a reference for new product pass design optimization and improvement.
Radius Compensation in Lateral Bending of L-Shape Plate Considering Rollers Deflection
Authors: Liu Jing , Li Zhi Jun , Li Lan Yun , Li Xiao
Published: March 2015

Lateral bending of L-shape plate is a novel forming technology to manufacture flange-like parts from angle bar or L-shape plate. However, the inevitable rollers deflection induced by rolling force leads to significant decrease in radius prediction accuracy of the flange products. Therefore, the radius compensation is implemented through adjusting forming parameters in order to obtain a flange product with the designed radius. In the paper, the rolling force and rollers deflection are solved with considering the workpiece-roller interaction; on this basis, a radius compensation scheme is proposed and evaluated. The results show that the predicted radii deviate from the desired ones less than 7.22%.
Research and Application of Milling Parameters Optimization Based on Genetic Algorithm
Authors: Hu Min Min , Zhang Yu , Yuan Sheng Wan
Published: March 2015

At present a number of machinery factories select cutting parameters mainly rely on the experience in China. In order to get the reasonable cutting parameters and then have a optimal machining surface quality, high production efficiency and low production cost. In this paper, using genetic algorithm and Matlab software [1] to optimize cutting parameters of milling and combining with the actual cutting test in factory to verify the optimized data. And then provide theory basis and feasible measure for milling.
Research and Development of Precision MIG/MAG Welding
Authors: Meng Ling Dong , Zhang Qing , Di Yue Lan , Shen Wei
Published: March 2015

MIG/MAG welding is a precision technology of high quality and high efficiency, and widely used. In this paper, the development of MIG/MAG welding was introduced, also the defect was analyzed. The principle and characteristic of T.I.M.E welding, Tandem MIG/MAG welding and wave controlled MIG/MAG welding was discussed. Then the further development trend of precision MIG/MAG welding was pointed out, providing a theory guide for using in equipped maintenance.
Research of Fused Deposition Modeling Process Oriented Component Design
Authors: Huang Zi Fan , Ma Yue Long , Wei Jia Hai , Pan Ai Qiong , Liu Jun
Published: March 2015

In the process of Fused Deposition molding (Fused Deposition Modeling, FDM), because the 3 d design is disconnected with manufacturing (or process), and prototype and precision is influenced by many factors, there are many disadvantages such as much design rework, difficult processing, low efficiency and high cost. Based on the concept of Design for Manufacturing ((Design for Manufacturing, DFM), this paper analyzes several factors that influence the forming accuracy, and puts forward the corresponding solutions to improve rapid prototyping manufacture parts strength and forming precision, combined with the actual rapid prototyping processing. It has certain reference value in the study of parameter selection and structure improvement of FDM process oriented component design.
Research on Dynamic Recrystallization Behavior of Extra-Heavy Backup Roll Forming Process
Authors: Yoon Dae Hwan , Yu Hao , Jung Dong Won
Published: March 2015

Heavy backup roll is a key part of steckel mill, because of its exceptional work environment, it needs high temperature resistance, fracture resistance, hardness, toughness and other aspects of performance. The fine equiaxed grains can be got by repeated dynamic recrystallization and deformation. There is a high density of dislocations and dislocation tangles in material, which can improve the microstructure and properties of material.
Research on Stable Forming of Titanium Alloy Bar Using Three-Roll Skew Rolling
Authors: Huang Guang Xing , Sun Bao Shou , Peng Wen Fei , Shu Xue Dao , Lu Wang
Published: March 2015

Titanium alloy with high strength, corrosion resistance, heat resistance and many other advantages has widely applications in aviation industry and the military-industrial complex. The market demand for titanium alloy increases year by year. However, the rolling technology for small size titanium rod is not mature due to its poor plasticity and difficult processing. In addition, current titanium alloy bar can not meet the high-end market requirements, it still largely dependents on imports now. Developing high-quality titanium bars is a major aim of titanium industry in our country in the future. Three-roll rolling is one of mature methods in current production of titanium alloy bars. Using this processing method for rolling titanium alloy bars, multi-standard, low-volume production requirements can be achieved.
Springback Analysis of Thin-Walled Stainless Steel Bellow in Hydroforming
Authors: Liu Jing , Liu Yang , Li Lan Yun , Li Xiao , Yang Shao Fei , Geng Yan Hai , Liu Fei Yan
Published: March 2015

Springback has an important influence on the forming quality of thin-walled stainless bellows hydroforming. By developing a FE model, the stress distribution is investigated and springback characteristics of two specification bellows are addressed. The results show that: (1) For tube Φ26×0.5, the maximum circumferential tensile/compressive stresses decrease by 32% and 29.1% after springback, respectively. The maximum longitudinal tensile/compressive stresses decrease by 51.8% and 39.6%, respectively. (2) Three indices are proposed to describe the bellow profile change after springback, namely, radial displacement of crown point; axial displacement of inner point; maximum convolution width. (3) For tube Φ26×0.1, after springback, the inward shrinkage of crown point increases by 0.7%, the bellow axial elongation is 0.76mm, the maximum convolution width increases by 30.3%.
Study on the Microstructure and Property for T-Joints of Al-Li Alloy Welded by Double Sided Synchronization Fiber Laser
Authors: He En Guang , Chen Li , Wang Ming Tao
Published: March 2015

In the experiment, the T-joints of 2060-T8/2099-T83 Aluminum-Lithium by double sided synchronization Fiber laser welding with thickness of 2 mm was studied aimed to know the microstructure, the distributions of micro-hardness, and the tensile strength of the T-joints. The results show that the microstructure is columnar fine grain zone, dendrite zone, and equiaxed crystal zone in turn from the weld fusion line to weld centre; the micro-hardness of the weld is lower than the micro-hardness of base metal, and softening phenomenon appears in the weld; The average circumferential tensile strength of T-joints is 423 MPa at room temperature, which reaches the strength of the base metal 82%, the average longitudinal tensile strength of T-joints is 449 MPa, which reaches the strength of the base metal 87%; The fracture of circumferential tensile samples initiates at the weld toe, and breaks in the weld centre or heat affected zone. The fracture of longitudinal tensile samples initiates at varying cross-section, there are dimples in the fracture surfaces of both circumferential tensile samples and longitudinal tensile samples, and the fracture is ductile.
Study on Tool Wear in Green Milling Ni-Based Superalloy
Authors: Wang Hui , Lu Yun , Liu Jing Jing
Published: March 2015

In order to solve the difficult machining problem of Ni-based superalloy, the water vapor and ionized air was applied as coolant and lubricant in milling process. The tool wear experiments on water vapor, ionized air, wet and dry cutting with carbide tool YG6A machining Ni-based superalloy GH4169 was carried out. The result showed that tool wear was quickly on milling GH4169 with carbide tool YG6A, and increased with the cutting speed.The flank wear land was uneven and the boundary wear was serious. During the ionized air condition the flank wear was more slowly than wet and dry cutting condition, the values of flank wear were reduced about 15 and 10 percent respectively. In addition, the result showed that The milling force and machined surface roughness increased with the flank wear.
The FEM Analysis for Feed Rate of Plate Multi-Point Composite Incremental Forming
Authors: Cai Gai Pin , Zhou Xiao Lei , Xiong Yang
Published: March 2015

Combined with the advantages of multi-point composite incremental forming(MPCIF) of uniform deformation, high formability and efficiency, and can efficient restrain plate’s instability, basing on 3D finite element analysis model of MPCIF, different feed rates were used to form the typical truncated pyramid-shaped work-pieces, the process of MPCIF was simulated and analyzed, and the equivalent plastic strain, forming precision and thickness reduction ratio of deformed parts were studied. The simulation results show that the maximum thickness reduction occur at the diagonal of the parts; plate’s thickness thinning can be more serious with the feed rate is bigger, and plate becomes more easy to crack; more uniform wall thickness and better shape accuracy can be obtain with the feed rate is smaller, but the forming efficiency is lower due to longer forming time.
The Influence of Metal Surface Roughness on Bonding Strength of Metal and Composite Material
Authors: Yang Rui , Xu Xiao Shan , Li Ke Zhao
Published: March 2015

The fiber metal laminates have a wide range of applications today, owing to its high-performance and light weight. However, the interface properties between the fiber face sheet and metal substrate are weak and there are differences in their mechanical properties, causing structural damage or failure. Therefore, this article has come up with a new way to enhance the bonding strength. Through the mechanical methods to get different surfaces, choosing Ra as the evaluating parameter. By conducting the mechanics tests of each specimen, the results showed that with the rising of the Ra, the maximum load of the specimen was rising, too. But the trend wasn’t always the same. After the best Ra, the load declined and kept steady. So, in a small range of roughness, the leading role of bonding strength is the surface of the metal, otherwise, the leading role is the surface of fiber face sheet.
The Research on Diameter Growth of Deep Groove Ball Bearing Inner Ring in Cold Rolling Process
Authors: Sun Bao Shou , Feng Geng , Shu Xue Dao , Qi Liang Tao , Pang Shuo
Published: March 2015

There is a close relationship between cold ring rolling product quality and ring diameter growth rate in cold rolling process, but the technological parameters are main factors in influencing ring diameter growth. The paper used both numerical simulation and experimental verification to study the effect of the core roller speed and wide-diameter ratio on increment of ring diameter in cold rolling process of deep groove ball bearing inner ring. It is found that the core roller has greater influence on diameter growth, and the faster the feeding speed of core roller is , the greater the increment of ring diameter is. Finally, it is verified that the agreement between numerical simulation and experiments is good.