bluuebunny/crossref_metadata_2025 huggingface dataset:
Effects of Heat Treatment on Microstructures and Properties of Ti811 Alloys
Authors: Wang Hui Gai , Wang Fei , Song Yan Pei
Published: October 2011

Mechanical properties and microstructures of Ti811 alloys under different heat treatment conditions were studied. The results show that the microstructures of Ti811 alloy consist of α, massive β and grain-boundary β after normal annealing. The intensity and hardness decreased, while the ductility increased. After double annealing, the primary phase α reduced and needle-like secondary α〞 was formed. The massive β and grain-boundary β changed into intergranular β gradually. The microstructure was relatively uniform. Then the intensity and hardness increased, the ductility decreased when compared to general annealing. The needle-like secondary α〞and metastable β would break down into dispersed α and β after solution hardening and aging. The combination properties of alloys would be improved. According to fractography of titanium alloy, the fracture mechanism of the Ti811 alloy was dissociation - brittle intergranular fracture, which was a type of fracture between the intergranular fracture of brittle and cleavage fracture.
Study on Erosion Wear Property of Nickel-Chromium Cast Iron
Authors: Xie Jing Pei , Wang Ai Qin , Wang Wen Yan , Li Luo Li
Published: October 2011

Erosion wear experiments on Nickel-Chromium cast iron were tested by MCF-30 erosion test machine. The structure and surface morphology of these samples were analyzed by Scanning Electron Microscopy (SEM), Transmission Electron Microscope (TEM) and XRD. The influences of the impact angle and acidity on erosion wear property were analyzed. The discipline of the erosion wear property was discussed as well. The experimental results indicate that after oil quench at 960°C and temper at 250°C, the alloy carbide (Fe, Cr)3C which works as the wear resistance skeleton distributes uniformly in the matrix ; the shape of erosion wear curve is “M”. and the biggest wear loss is when the impact angle is 60°; the erosion wear property is affected greatly by the strong acid, but is little even can be ignored when pH≥3. The erosion wear mechanism of Nickel-Chromium cast iron is selective wear.
Analysis of the Impact of Row Materials on the Performance of Self-Leveling Cement Mortar
Authors: Zhao Zhong Guo , Shi Zhen Wu , Liu Shuang
Published: October 2011

Using self-leveling cement mortar, we can make a solid flat surface economically in accordance with the requirements, which is widely recognized and applied. Because of the demands of self-leveling, the mortar required materials have good liquidity and flow retention. Therefore, the raw materials must have a supporting role. Analyzing the raw materials, the paper study the effects of raw materials for the self-leveling cement mortar.
Difference and Application of Matrix Displacement Method and Finite Element Method in the Truss Structure Analysis
Authors: Cheng Hu , Yan Xin Chi
Published: October 2011

This article analyses the theories of two methods of matrix displacement and finite element, and the application of calculation in the actual structure. Then it explores the subtle differences between them: Matrix displacement method can only be used for analysis with known unit nodes force-unit nodes of the relationship between the displacement of the truss structure, and not the continuous body structure. The major differences between both are the establishment of the basic principle and solution of the emphasis. Establishing total stiffness matrix according to the geometric property of the structure and then forming integral force vector via loading conditions when matrix displacement method is used to solve the unit fixed-end force. It’s necessary to stack fixed end force; While finite element method mainly bases on the known load and the material nature of structure after structure discretization. Node force or node stress is directly got by the derivation of displacement, but the fixed end force is lost, which dropping the accuracy of the stress. To solve plane frame structure and get structural internal force, the distinguish is checked on the example.
Prepartion of Al-Mn Alloy Coatings on Low Carbon Steel by Hot-Dip-Aluminizing
Authors: Li Xin Mei , Liu Bing , Dong Xiao Feng , Yu Qing , Xu Qiao Yu
Published: October 2011

Low carbon steel were coated by hot-dipping into a molten bath containing Al-2 wt%Mn, Al-9wt%Mn, Al-13wt%Mn, respectively. The phase composition, morphology and the adhesion of the aluminide layer were characterized by XRD, SEM, EDAX, OM and scratch tester. The results show that the coating layers is mainly composed of Al, FeAl3, Fe2Al5 and MnAl6 phase. The coatings consists of two-layers structure, i.e., topcoat Al-Mn alloy layer and tongue-like intermetallic compound, and the coating layer is about 800 μm thick. The adhesion of the Al-Mn alloy coatings were characterized by Lc value and were found to be about ~30N. The adhesion gradually decrease with the increase of the Mn contents in alloy coatings.
The Design of a Compact Cable System for Bridge
Authors: Zhu Wan Xu , Qin Xin Yu , Huang Ying , Zhu Xing
Published: October 2011

This paper presented a new kind of strand cable system, which cable body was composed by the strands isolated by HDPE sheath. The isolation extrusion method were used in anchoring the bundle of strands on the anchorage of both cable ends. The type of the cable-stayed structure, features, test and engineering design and application were described. The result shows that the cable system has compact anchorage structure and small diameter, which can be more stable to reach the correlative standards requirement on static load and fatigue performance. The cable system provides a new choice in the bridge construction and had been widely applied in China since 2005.
Property Investigation on a Precious Ceramic Alloy
Authors: Zhang Heng Jin , Liu Ke Fu , Miao Wei Dong
Published: October 2011

Experiment investigation of mechanical, physical, and biological properties on a dental precious alloy was performed. The density of the alloy is 12.04 g/cm3, the solidus temperature is 1144.5 °C and the liquidus temperature is 1283.5 °C. The coefficient of thermal expansion of the alloy is 14.84×10-6 /°C between 25 °C to 500 °C. The average 0.2% yield strength is greater than 400MPa, and the average percentage elongation after fracture is greater than 4%. The average bonding strength of the metal-ceramic is 41.93 MPa, much greater than the standard requirement. The biocompatibility of the alloy is excellent, there are no cytotoxicity reactivity, sensitization, irritation, mutagenicity and short-term systemic toxicity. The alloy is a superior dental alloy with excellent mechanical, physical and biological performance.
Mechanical Performances of Concrete Made with Manganese Slag
Authors: Liang Duo Qiang , Qin Feng , Li Xu Guang , Jiang Ji Bo
Published: October 2011

It is of great importance to innocuity, minimization and reutilization of manganese slag generated in manganese product by electric furnace process. In the paper, ordinary Portland cement was replaced partly by manganese slag to then evaluate manganese slag’ effect on mechanical performances of them. The experimental results obtained show that ordinary Portland cement added less than 30% by manganese slag was improved in mechanical performances and the cement concrete added less than 30% by manganese slag was not changed significantly. To lower economic cost and achieve enhanced mechanical performances, manganese slag can be substituted partly to cement concrete.
Hemicellulose Extraction from Coconut Shell
Authors: Li Ling , Chen Yong , Xu Hui
Published: October 2011

Hemicelluloses were extracted from coconut shell by ultrasound-assisted alkaline solution of hydrogen peroxide method. Chemical composition and physicochemical properties of the hemicelluloses obtained were elucidated by FT-IR spectra analysis and molecular determination. The results show that the yield of hemicelluloses from coconut shell is highly dependent on the pH-solution, reaction time, and H2O2 concentration.
Thermal Bridges in Building Envelope in Hot Summer and Cold Winter Areas of Thinking
Authors: Zhang Xin Hua , Liu Jian Xin , Chen Zi Rong , Wang Xin Sheng , Wang Meng Yun , Ning Li Qing
Published: October 2011

Because of the requirements of building palisade structure, reinforced concrete members on the wall outside form thermal bridge. According to in hot summer and cold winter climate characteristics, and analysis of the exterior insulation system properties, thermal bridge from heat preservation material selection, construction technology and construction indoor maintenance in prevention and control measures proposed thermal bridge.
Effect of the Duty Cycle on Boronized Layer Formed by Pulse Electrodeposition
Authors: Yang Hai Li , Tang Guo Zhang , Li Yun Gang , He Ning , Zhang Yu Zhu
Published: October 2011

Boronized layer on silicon steel substrate was fabricated using pulse electrodeposition technique with different duty cycle in KCl-NaCl-NaF-Na2B4O7 molten salts. The effect of the duty cycle on composition and microstructure of obtained layer was investigated. The boronized layer was analyzed by X-ray diffraction analysis (XRD), optical microscopy (OM), glow discharge spectrometry (GDS), and atomic force microscopy (AFM). The results showed that in the range of 10-50%, duty cycle almost had no effect on composition and thickness of the layer. The boronized layers in this range exhibited FeB phase on the surface of silicon steel. However, duty cycle had great effect on the microstructure of the boronized layer. A fine grain size boronized layer can be obtained at a duty cycle of 20%.
Surface Modification for Porous Artificial Lightweight Aggregate and Mechanical Properties of the Resulting Concrete
Authors: Liao Ning , Cui Hong Zhi
Published: October 2011

This research is one part of preliminary work for integrated structural-functional energy storage concrete by using porous artificial lightweight aggregate and phase change material. Lightweight aggregate concrete (LWAC) has been applied more and more extensively in recent years, but high water absorption of porous artificial lightweight aggregate (LWA) is inconvenient for LWAC production. In order to improve LWA application, in this paper, two aspects of lightweight aggregate (LWA) study have been carried out, namely, a) LWA surface modification. The effects of different concentration of surface modifier on water absorption of modified LWA were studied. b) Mechanical properties of lightweight aggregate concrete made of the unmodified and modified LWAs Through comparing the water absorption of unmodified and modified LWAs, it can be known that the surface modification for LWA can reduce the water absorption obviously. The three kinds of lightweight concrete possess nearly same strength at 7-day and, at 28-day, the strength of LWAC using 1:20 modified LWA is highest and that of LWAC using 1:5 modified LWA is lowest. 28 days compressive strength of LWAC using 1:20 modified LWA could be up to 46.1MPa.
The Research on Technology of Electroless Ni-W-P Ternary Alloys Plating on the Aluminium Alloy
Authors: Yao Huai , Zhu Guang Lin , Du Meng
Published: October 2011

To improve the surface hardness，corrosion resistance and wear resistance of the coating substrate, the ternary Ni-W-P alloy coatings were deposited on H12 aluminium alloy by electroless plating. The microstructure, phase transformation, plating velocity and hardness were investigated with X-ray diffraction technique, scanning electron microscope and differential thermal analysis. The results showed that when the PH value of electroless plating solution was 9.0 and the temperature of solution was 85°C, after 3h electroless plating, the substrate was completely covered by Ni-W-P plating, the surface was composed of uniform crystalline grains, their average diameter was about 7μm and they had no obvious defects, the contents of W reached up to 9.60%, and the hardness attained 610HV. In the temperature range of 75-90 °C, the plating rate has been increasing with temperature, when the temperature reached 90 °C, the plating rate reached as high as 13μm / h. When the temperature of heat treatment reached 336°Cfor 1h, the crystallization of Ni3P on the surface began to come into being. The maximum hardness of Ni-W-P plating was up to 920HV after heat treatment at 380 °Cfor 1h.
A Contrastive Study between Chinese Traditional and Western Classical Column within Style Decoration
Authors: Yao Gui Yang , Hu Wei Ping , Tian Huan Huan
Published: October 2011

Compared with the column style of Chinese traditional and Western classical from chapiter, trunk, column base in detail. Analysis of the column of the Eastern and Western Art Deco and shape differences. By comparing ,absorb the essence of both for the theoretical and practical of modern style column type decoration.
Study on the Effect of Surface Coating on Thermal Manikin's Repeatability
Authors: Yang Kai , Jiao Ming Li
Published: October 2011

Thermal manikin is a system of simulating figures and heat states of human body. Present thermal manikin is always enclosed by hard materials, and not covered with surface coating. So the surface condition of thermal manikin is very different with real body, which reduces thermal manikin's repeatability. Therefore the research on thermal manikin's surface coating and its effect on thermal manikin's repeatability are necessary. In this paper, an appropriate material was selected to be thermal manikin's surface coating and the satisfying result in improving the repeatability of thermal manikin was achieved. Firstly, five kinds of candidate surface coating materials were selected, which were HTV, EVA, TPU, natural rubber latex and cotton fabric. To evaluate the synthetic performance of these materials, parameters characterizing material's mechanical and thermodynamic properties were achieved by series of experiments. Meanwhile, fuzzy mathematic theory was employed to do data analysis, which showed that HTV had satisfying optimization performance and can be used as thermal manikin's surface coating. Finally, to verify the function of HTV surface coating in improving thermal manikin's repeatability, comparative repeated experiments were performed in climate chamber when thermal manikin covered with HTV surface coating and did not cover with HTV surface coating. Results show that HTV surface coating can improve the repeatability of thermal manikin obviously.
Study on Processing Technology for Mold Cavity Parts
Authors: Liu Xiao Juan , Huang Xin Bing , Qiu Shu Qin
Published: October 2011

A case study of typical mold parts, combining the Structure characteristics of the parts and considering various phenomena that may occur during the processing of the parts, we finally worked out a reasonable scheme. In addition, according to optimize processing technology, we select Mastercam software for auto-programming and machining simulation, achieving high precision and high efficiency machining of the parts and improving economic efficiency of enterprises. Conclusions in this paper give a valuable reference to machine mold parts.
Prediction of Edgewise Compressive and Side Tensile Elastic Modulus of Core Materials of Ripple Structure Sandwich Composites
Authors: Zhang Jian She , Li Di Hong , Zhang Dong Xing , Tian Ye , Xiao Hai Ying , Jia Jin
Published: October 2011

Edgewise compressive elastic modulus, side tensile elastic modulus and poisson’s ratio model of ripple structure sandwich composites were built in this paper, and the predictions of these mechanical properties were also conducted.
Review of Research on Special Load and Vibration Behavior of Shaft Tower Structure
Authors: Hou Jun Feng , Su San Qing , Wang She Liang , Cheng Kai Feng
Published: October 2011

Shaft tower has the characteristics of long service time and once the damage will affect the normal production, thus ensuring the normal use is particularly important. Vibration made by the Multi rope friction hoist operation will lead to floor resonance, thus" card tank" and" rolls over" loads determining the hoist layer structure arrangement become very critical. Through the analysis of existing data, the shaft tower vibration characteristics and seismic behavior research is analysed and forecasted.
Optimization of Cutting Parameters on Turning Process Based on Surface Roughness Using Response Surface Methodology
Authors: Yusuf Muhammad , Ariffin Mohd Khairol Anuar , Ismail N. , Sulaiman S.
Published: October 2011

This paper describes effect of cutting parameters on surface roughness for turning of aluminium alloy 7050 using carbide cutting tool with dry cutting condition. The model is developed based on cutting speed, feed rate and depth of cut as the parameters of cutting process. The selection of cutting process was based on the design of experiments Response Surface Methodology (RSM). The objective of this research is finding the optimum cutting parameters based on surface roughness. The relation between cutting parameters and surface roughness were discussed.
Research on Design for Comforts of Modern Residence
Authors: Zhang Xun , Ling Jie Hua
Published: October 2011

With the improvement of people's awareness of the living environment, there is an increasing need for comfortable residence surroundings, and they begin to re-examine the elements of residence quality and residence comfort. From the perspective of the psychological needs of people's behavior, this article expounds residence's natural and cultural environment, traffic organization, layout design, sothat in designing residence people’s needs and comfort requirements are put in the priority, thus constantly improving the dwelling quality.
Numerical Simulation Temperature Field of Laser Cladding Titanium Alloy
Authors: Yang Guang , Wang Wei , Qin Lan Yun , Wang Xing Lang
Published: October 2011

Abstract: In order to control the thermal stress of cladding, a numerical simulation of temperature field during multi-track & multi-layer laser metal deposition (LMD) process is developed with ABAQUS based on “element birth and death” technology of FEM. The dynamic variances of temperature field and stress field of forming process are calculated with the energy compensation of interaction between molten pool-powder. The temperature field, temperature gradient, thermal stress field and distribution of residual stress are obtained. The results indicate that although the nodes on different layers are activated at different time, their temperature variations are similar. The temperature gradients of samples are larger near the molten pool area and mainly along z-direction.
Influence of Cooling Rate on the Microstructures and Properties of Q550
Authors: Li Fan , Yi Hai Long , Liu Zhen Yu , Wang Guo Dong
Published: October 2011

A Q550 high strength steel was selected at two different cooling rates through ultra-fast cooling process, and its microstructures and strengthening mechanisms were analyzed. The results show the bainite transformation temperature of the steel decreased with the increasing of cooling rate.The ultra-fast cooling process can improve the performance of Q550 compared with the conventional cooling process, and the yield strength, tensile strength and elongation are 600MPa, 755MPa and 19%, and - 20 °Cimpact energy is 253J, and good strength and toughness are obtained under ultra-fast cooling process. The microstructure of this steel is bainite and good strength and toughness are caused by the refinement of bainite and fine precipitates. Ultra-fast cooling technology improves the strength and toughness of this steel effectively.
Milling Parameters Optimization by Grey Relation Theory
Authors: Zhang Xiao Hong , Yin Guo Fu
Published: October 2011

Propose the grey relation theory for influence of electric milling on machining targets in achieving parameter optimization, when an engine cylinder head milling processing under plane milling tool. The experiment was designed via orthogonal experimental design technique. Some parameters such as machining distortion, surface roughness and machining efficiency were chosen as machining targets, and the milling speed, feed per tooth and milling depth were chosen as milling parameters, calculate and analyze the grey relational degree and relational coefficient between milling parameters and machining targets. The optimized milling parameters including milling speed of 380m/min, feed per tooth of 0.05mm, and milling depth of 1.5mm were obtained in single-object and multi-objects. Experimental results show that the machining distortion of 0.055mm, the surface roughness of 0.7964μm and the machining efficiency of 36.3 mm3/min are excellent according to the optimized designs, and the machining efficiency and the machining quality are improved greatly.
Experimental Study on Frost Resistance of the Shale Ceramsite Concrete
Authors: Yang Wei Jun , Yang Yong Da , Yang Yi
Published: October 2011

In this presented work, by freeze-thaw test for three groups of shale ceramsite concrete with different mix proportion, the experimental results show: the shale ceramsite concrete has preferable frost resistance property. After 100 times freeze-thaw cycles, its loss in weight and strength is very small; the frost resistance increases as ceramsite pre-wetting time is raised, and with the increasing of the water cement ratio, the frost resistance declines. The statement that ceramsite pre-wetting treatment is detrimental to frost resistance still deserves discussion, as it depends on the pore structure, water absorption characteristic and concrete air content of ceramsite itself. Meanwhile, freeze-thaw mechanism of the shale ceramsite concrete was analyzed in this paper. The study results provide some reference for other studies.
Critical Strain Model of Cr4 Steel for Heavy Supporting Roller
Authors: Chen Xue Wen , Zhang Qi
Published: October 2011

Critical strain is the basis to determine whether the dynamic recrystallization occurs during hot deformation process, it is important for designers to control hot forming process and microstructure of final product. In order to investigate the influence of deformation temperature and strain rate on critical strain of Cr4 steel, hot compression simulation experiment was conducted for Cr4 steel in the temperature range of 750～1200°C and strain rate of 0.002～5S-1 by means of Gleeble−1500D thermo-simulation machine. The results showed that the critical strain increase with decreasing deformation temperature and increasing strain rate. Based on the experimental data and regression analysis method, the mathematical model of the critical strain of Cr4 steel is constructed. The critical strain model provides data support to predict the dynamic recrystallization during Cr4 heavy supporting roller hot forging process.
The Boundary Element Method to Solve the 2D Elastic Stress and Displacement Problem
Authors: Yang Zhong Ping , Cong Nan
Published: October 2011

With the balance of elastic mechanics differential equation and basic solution(Kelvin solution) As the foundation introduced the boundary element method for calculating the stress and displacement of elastomer. With a numerical example of the algorithm proved. The results show that the method can be more accurate solving 2 D elastic stress and displacement problem.
Effect of Initial Particle Size on Coarsening Kinetics of γ Prime Precipitate in Nickel-Based Superalloy - A Phase Field Study
Authors: Ke Chang Bo , Xie Bao Zhong
Published: October 2011

The effect of initia gamma prime particle size on coarsening kinetics of gamma prime precipitates in Nickel-based superalloys has been studied by means of phase field method which takes into account the lattice misfit. The simulation shows that the gamma prime precipitate morphology at the late stage of coarsening is independent of initial particle size, and the rectangle-like precipitates dominate the matrix which is in good agreement with experimental studies. The coarsening exponent increases with initial size, while the coarsening rate constant exhibits no apparent regularity. Although the coarsening trend is independent of initial particle size, the precipitate size increases with initial size at a given aging time. Through precipitate size distribution calculation, it is found that the size distribution is fairly stable, which is not sensitive to the initial particle size.
A Study of Fuzzy Neural Networks Control for the Quality of Resistance Spot Welding
Authors: Guo Zheng Hua , Fang Ping , Cui Jun Hua , Wang Jie
Published: October 2011

A fuzzy neural network based system was developed to control the quality of resistance spot welding. A fuzzy neural controller (FNC) was designed to realize the memory of the fuzzy neural control bases on a back propagation (BP) network, accordingly achieve the mapping of fuzzy input and output. The experiment results show that this method can compensate the multi-crossfire’s influence on the welding currency, keep a high control precision, and fulfill the demand of high precision quality monitoring to the resistance spot welding.
Seismic Control Research of Longitudinal Floating Bridge Based on MR Damper
Authors: Yang Meng Gang , Ouyang Kui
Published: October 2011

In order to reduce the longitudinal displacement of longitudinal floating bridge subject to earthquake excitation, seismic response reduction control strategy for longitudinal floating bridge with MR damper is developed based on the MATLAB software for numerical simulation and the vibration control algorithm of classical linear quadratic of full-state feedback. In this paper, the seismic response reduction analysis for a longitudinal floating bridge, Pingsheng Bridge which is a self-anchored suspension bridge with a single tower, is completed, and also the optimal active control force is obtained. Furthermore, the effect of time delay on seismic control is investigated. The results show that the longitudinal displacement of longitudinal floating bridge can be effectively reduced by vibration control system with MR damper, and the time delay has little influence on seismic response reduction of longitudinal floating bridge.
Microstructure and Mechanical Properties of a Rapid Directionally Solidified Ti47Al Alloy
Authors: Chen Rui Run , Ding Hong Sheng , Guo Jing Jie , Su Yan Qing , Fu Heng Zhi
Published: October 2011

The ingot of Ti47Al alloy was prepared by a newly developed rapid directional solidification, the microstructure and compressive properties of the ingot was observed and tested. The results show that the macrostructure consisted mainly of coarse columnar grains parallel to the axial direction, with the size of 0.5mm wide and 10mm in length. The direction of lamellar is almost perpendicular to the growth direction in the longitudinal section and no dendritic core is found. The average ultimate compressive strength of the specimens with grain growth parallel/perpendicular to the compressive direction is 1233.3 and 861.7 MPa respectively. The fracture mode for specimens with grain growth parallel to the compressive direction exhibits predominantly translamellar fracture, however, that for specimens with grain growth perpendicular to the compressive direction exhibits predominantly delamenation or interlamellar fracture.
An Impact Analysis of Turbine Guide Bearing Stiffness on Rotating Parts’ Transverse Vibration Characteristics
Authors: Zhu Yi , Lai Xi De , Wang Li Fa
Published: October 2011

A vibration calculation model for a large-scale hydraulic turbine group is built to act on the unbalanced force between the rotor and the runner. Take the Francis turbine group for example. Using the finite element method, the units lateral vibration characteristics of rotating components were calculated and analyzed. The paper discusses the impact of location and the guide bearing stiffness on the lateral vibration characteristics of the unit. Based on the elastic supporting models, the paper also compares the results of the guide bearing stiffness modified simultaneously and respectively. Results show that the guide bearing stiffness has a significant impact on the lateral vibration characteristics of the location of the unit, which provides a reference for the reduction of vibration and the optimization of the supporting structure of the turbine unit.
Structural Fatigue Analysis on Expansion Joints of Diversion Penstock of Hydropower Station
Authors: Dong Jia , Yan Gen Hua
Published: October 2011

Abstract: The section of diversion penstock near the powerhouse behind dam in some hydropower station is equipped with expansion joints, which is used to remedy deformation of penstock in axial and lateral due to the variation of temperature and foundation subsidence. When the hydropower station is in normal water diversion and power generation, the discharged flow generates fluctuating loads, induces structural vibration of guide cylinder of expansion joints, gives rise to cumulative fatigue damage of guide cylinder and also leads to weld joints in guide cylinder cracking to fall off. When generating unit is in the condition of load rejection, expansion joints bears not only the fluctuating pressure loads of the flow, but also undergoes the shock from water-hammer pressure as well, so this demands higher requirement for the safety and reliability of expansion joints structure. It has important engineering value for ensuring safety and reliability of water-diverting power generating system to conduct researches on dynamic effect that fluctuating loads having on expansion joints guide cylinder structure and cumulative fatigue damage of terminal weld of guide cylinder
Study on Properties of Al2O3 -CaO-CaF2 Slag System
Authors: Peng Ke Wu , Zhang Peng , Xie Jian Guo , Ma He Li
Published: October 2011

Liquidus temperature, electrical conductivity and phase composition of Al2O3 -CaO-CaF2 slag system were studied. The results showed that the liquidus temperature of the slag decreased with increasing CaF2 content, and its electrical conductivity increased with increasing CaF2 content and temperature. The liquidus temperature is 1468°C when the content of CaF2 is 20%. Its phase composition are composed of CaAl2O4、Ca2Al3O6F、Ca2AlF7 andAlF3. When the content of CaF2 is 10%, there are lots of CaAl2O4. The content of CaAl2O4 decreased with increasing CaF2, but the content of Ca2Al3O6F and Ca2AlF7 increased.
Study on Model of Thermal Crown of Single-Stand Irreversible Foil Mill
Authors: Hao Liang , Di Hong Shuang , Gong Dian Yao
Published: October 2011

Based on the principles of heat transfer, finite difference method was adopted to develop program of calculating thermal crown of single-stand irreversible foil mill. The temperature distribution and thermal crown of roll were calculated for one rolling schedule. The temperature of each layer calculated was analyzed. The computed and measured surface temperature was compared, which shows good consistence with each other. The law of thermal crown changes with time conformed to practical account.
The FOPS Design of Wheel Loader Cabin Based on Topology Optimization
Authors: Wu Xiao Ming , Li Wen Biao , Liu Chun
Published: October 2011

Abstract. It is difficult to seek an optimization design for the falling object protective structure (FOPS) of wheel loader cab. Focusing on this problem, we discuss the topology optimization with SIMP theory under impact condition and the designing parameters, response function and constrain conditions are confirmed. The proposed method is applied to wheel loader cab to get a topology structure. The numerical analysis indicate that the optimized design of wheel loader cab has light weight and can provide sufficient protect for the operator.
Aero-Elastic Active Control Modeling via Improved POD Method
Authors: Wang Xiao Juan , Xu Min
Published: October 2011

The main goal of present paper is to construct an efficient reduced order model (ROM) for aerodynamic system modeling. Proper Orthogonal Decomposition (POD) is presented to address the problem. First, the snapshots are collected to form the POD kernel, and then Singular Values Decomposition (SVD) is used to obtain POD modes, finally POD-ROM can be constructed by projecting full order aerodynamic system to POD modes subspace. However, the robustness of ROM constructed via conventional POD method is not guaranteed. To improve the robustness of conventional POD method, balanced truncation modification was introduced. Aero-elastic active control case was chosen for this new method validation. The results demonstrate POD method with balanced modification is efficient and accurate enough for aeroelastic system analysis.
The Noise-Induced Chaotic Transition in a Vibro-Impact Oscillator
Authors: Feng Jin Qian , Wang Tao , Xu Wei
Published: October 2011

The influences of noise on chaotic dynamics in a vibro-impact oscillator, modeled as Duffing Van der Pol (DVP) system with unilateral rigid barrier, are investigated. An interpolation strategy is introduced to locate the impact instants, and effective numerical method is proposed to improve the computational precision in the vibro-impact oscillator. Near the boundary crisis, the phenomenon of noise-induced chaotic transition occurs. Our studies reveal that the escape of oscillator from the boundary is responsible for this chaotic transition. The increase of noise can aggravate this escape.
Numerical Simulation of the Reverse Plugging of a Thin Plate Irradiated by Long Pulsed Laser
Authors: Yan Yi Xia , Yin Yi Hui , Chen Yu Ze
Published: October 2011

Based on the axisymmetric thermal elastoplasticity theory, the reverse plugging of a Cu thin plate irradiated by ms-degree long pulsed laser is calculated by FEM. The temperature and stress data on typical position of the thin plate are obtained, and the space distribution of the all parameters is given. The FEM results, theoretical and experimental results are in good accordance with each other.
Reinforcement Phase of Situ TiC with the Laser Surface Alloying on Steel C1045
Authors: Wang Wen Yan , Wang Pei , Xie Jing Pei , Lu Gao , Dong Xiao Ming , Yu Hui Wu
Published: October 2011

In this study, Nd: CW CO2laser were used in LSA experiment on Steel C1045 with four different systems alloyed by Sub-Micron Ceramics, namely Ti+C, TiO2+C, TiC, Ti+V+C. The high hardness alloyed coating was prepared on the surface of Steel C1045 adopting laser alloying process for the ideal reinforced effect of surface that we expect. The microstructures of the four different alloy systems were analyzed by SEM. The microhardness and the friction coefficient of these laser alloying layers were examined, then the abrasion resistance and the main wear mechanism were summarized. According to the experimental results, comprehensive properties of Ti+V+C system were the most excellent in all systems.
Research on Parametric Design Platform of Gear Based on Pro/E
Authors: Qi Xiang Yang , Lin Shu Zhong , Wang Quan Jing , He Qian , Wang Peng
Published: October 2011

A development system on gear parametric design and check based on Pro/E4.0 and Visual C++ was built in the paper. The system included three modules: the standard spur gear, helical gear and bevel gear. According to the human-machine interface, the 3D parameterization model and 2D engineering drawing of the gear were achieved. And according to the actual situation of the load, the gear was automatically calculated, checked and output results. The system was adjusted successfully
Experiment of Temperature Field for High Speed Orthogonal Turning
Authors: Wang Mu Lan , Feng Yong , Li Xiao Xia , Wang Bao Sheng
Published: October 2011

An experimental system used for temperature measurement is designed by the K-type thermocouple thermometry to achieve a direct measurement of cutting temperature in high speed orthogonal turning. The general regularity of temperature distribution is concluded, and the corresponding influences of cutting speed and cutting depth on the maximum temperature value are discussed in detail. Experimental data and simulating results are comparative analyzed to demonstrate the feasibility and correctness of Finite Element Method (FEM) model simulation and analytical solution. The verified model of temperature field can be applied to develop an effective non-contact soft-sensing method for high speed cutting temperature.
Preparation and Characterization of Novel Lithium Tantalate Target
Authors: Wu Xu Yong , Zhang De Yin , Li Kun
Published: October 2011

The novel lithium enriched lithium tantalate (LiTaO3) targets were papered by employing the sol-gel process and the high temperature sintered process. The sol of LiTaO3 was firstly prepared through reacting lithium ethoxide with tantalum ethoxide. The LiTaO3 powder was fabricated by presintered LiTaO3 dry gel 4 hour, at 800°C. The 11cm13cm1cm lithium enriched LiTaO3 target samples were prepared by sintered the pressed LiTaO3 powder billet 4 hour in the 850°C muffle furnace. The density of the 5% overdose lithium enriched LiTaO3 target is measured 5.96g/cm3. The XRD measured results show that the ion beam enhanced deposited (IBED) thin film samples using the prepared 5% overdose lithium enriched LiTaO3 target have the polycrystal structure of LiTaO3, but there has remanent Ta2O5 existed in the IBED thin film samples. The main reason for the remanent Ta2O5 growth was due to the stoichiometric proportion mismatch between Li and Ta in the IBED thin film samples during the high temperature annealed process, which caused the lithium oxide evaporation loss from the IBED thin film samples and made the proportion of Ta2O5 increase. After multipule repeated target prepared experiments, the 8.76% overdose lithium enriched LiTaO3 target is suitable for fabricating the 550°C annealed IBED LiTaO3 thin film. After the repeated process experiments, the suitable deposited process parameters of the IBED-C600M instrument for the 8.76% overdose lithium enriched LiTaO3 target were obtained. The SEM micrographs of the 550°C annealed IBED LiTaO3 thin films prepared by the 8.76% overdose lithium enriched LiTaO3 target reveal the prepared thin films are uniform, smooth and crack-free on the surface, and the perfect adhesion between the thin film and the substrate. The successfully fabricated LiTaO3 thin film samples verify the prepared processes of novel LiTaO3 sputtering target are effective.
Numerical Study on Adhesive Interface Reinforcement of Piezoelectric Composite under Impact Load
Authors: Bai Rui Xiang , Wang Liang
Published: October 2011

The interfacial reinforcement with interlaminar chopped fibers of piezoelectric composite under impact electro-mechanical load was studied using nonlinear finite element method. A meso- mechanical model based on the main toughness reinforcement mechanism of single fiber bridging and pull out was adopted, and then a tri-linear bridging law was obtained, while the interface chopped fibers by defining nonlinear bidirectional spring elements between coincident nodes on the two crack surfaces within bridging zone and the energy release rate was calculated using the virtual crack closure technique. The numerical investigation indicates that the interlaminar chopped fiber can effectively reduce the crack tip energy release rate whether the applied voltage is positive or negative, which was an effective technique improve the interfacial toughness of the piezoelectric composite adhesive structure.
Experimental Investigations of Shear Lag Effect in a Simply Supported [0o ∕±45o2 ∕ 0o]T Laminated Box Beam
Authors: Wu Ya Ping , Zha Zhi Xiang , Wang Li Xia , Wang Yin Hui
Published: October 2011

With the features of high efficiency, low consumption and good mechanical characteristic, thin-walled composite box beams have been broadly adopted in structural engineering, and its mechanical behavior has became an active research area. As shear lag effect can bring an uneven normal stress distribution on the flanges, it would remarkably affect the strength design of thin-walled beams. This paper focuses on the experimental investigations of shear lag effects in [0o∕±45o2∕ 0o]T laminated box beam under concentrated loads, and test results indicates that the shear lag effect in this composite box beam can be simulated by the two parabola.
Crystallization Kinetics of Amorphous Finemet Modified with Co
Authors: Ding Yan Hong , Li Ming Ji , Yang Bao He , Ma Xu
Published: October 2011

The aim of this work is to present experimental results of investigation on crystallization process of Co-containing Finemet-type alloys. To different Finemet alloys, there exist different changing trends of the initial crystallization temperature after Co addition. Addition of Co in Fe73.5Cu1Nb3Si13.5B9 alloy reduces the stability of the amorphous phase, and leads to the formation of nanocrystallites at lower temperature. While adding Co increases the stability of Fe76.9Cu0.6Nb2.5Si11B9 amorphous phase, and results in higher nanocrystallites temperature. Using the method of Kissinger, possible reasons were analyzed for the variation of the apparent activation energy of crystallization determined from DSC thermograms.
Study on Electrical Sliding Wear Property of Cu/MoS2/Mo Composites
Authors: Ma Dou Qin , Xie Jing Pei , Li Ji Wen , Wang Ai Qin , Wang Wen Yan , Zhang Zhi Chao , Wang Ya Jun
Published: October 2011

In this paper, the Cu/MoS2/Mo composites were prepared by the powder metallurgy technology. The friction wear test was tested by the HST-100 High Speed Electric-tribometer. The microstructure and wearing surface morphology were examined by SEM and EDS. The electrical sliding wear behavior of the composites was discussed. The results indicated that the dense composites are obtained; the wear mechanisms of Cu/MoS2/Mo are mainly abrasive wear and adhesive wear with arc erosion; the effects of current intensity and sliding velocity on the wear property of the composites are complicated, and the composites show the best property when the current intensity is 60A and the sliding velocity is 40m/s.
Simulation Analysis of the Tensile Process on Sheet Sample
Authors: Bai Yin Lan , You Da Yong , Lu Guo Qing , Liu Chen Xin
Published: October 2011

Stress-strain is commonly used in engineering; however the real stress-strain is more used in the test and exploitation of new product. ANSYS finite element software is adopted in this study, stress-strain of the tensile sample of the sheet in different stage is calculated under the 10mm displacement load, stress-strain curve is obtained, and the engineering and the real stress-strain are analyzed. The results show that simulation data are in accordance with the measured ones, the error is less than 3%, which proves that the model is the rational.
Study on the Effect of Different Joints Material on GRP Jacking Pipe
Authors: Chen Jian Zhong , Li Zhuo Qiu
Published: October 2011

GRP (Glass fiber reinforced plastics) jacking pipe has many advantages, such as lightweight, high strength, corrosion resistance, long life, good hydraulic and so on. The key of GRP jacking pipe is the joints problem. There are two different joints material in GRP jacking pipe: GRP ring and steel ring. The effect of different joints material on the GRP jacking pipe is analyzed by ABAQUS. When the jacking pipe with jacking force, the deflection angle of the pipeline has significant effect on joints force, even if the 0.05° of deflection, the pipe axial compression stress will double. When the jacking pipe without jacking force, joints force related to free deflection angle of the joints. Through comparison the steel ring and GRP ring shows that GRP ring better than steel ring on the ability to withstand deflection.
Cultural Product Design Using a TRIZ Based Methodology
Authors: Liu Elim , Wang Wei
Published: October 2011

The cultural and creative industry is an emerging industry globally. However, due to the intangible nature of cultual content, few systematic design methods have been sucessfully applied to the area of cultural product design. This study demonstrates the applicability of the theory of inventive problem solving (TRIZ) to design cultual products. Traditionally, cultual product design largely relies on designer inspiration and experience. By integrating TRIZ problem-solving tools and its knowledge base, this work proposes a novel TRIZ based approach to address this weakness in cultual product design. The proposed method is verified using two case studies. Proven to show that this methodology could help designers integrating culture features in design process, thence it has a high practical value.
Study on Microstructure Defects of High-Carbon Wire Rod SWRH82B Drawing Fracture
Authors: Chen Yong Li , Qian Cheng , Zha Xian Wen , Chen Jian Hua , Yan Hui , Wu Ming Quan , Chen Li Qing
Published: October 2011

In this paper,SWRH82B steel as the object of study,analysis of several typical drawing fracture tpyes to explore the reasons for fracture by SEM testing.The results show that:the type of slope-type fracture mainly due to cracks defects generated in surface of the wire rod;the Pen-shaped type fracture due to central segregation in the continuous casting process;whole flat brittle fracture mainly due to a serious slag in the continuous casting process.
Comparison of Dimensional Accuracy for Different Investment Casting Shells and Binders Based on Selective Laser Sintering
Authors: Yan Qing Song , Xiong Xu , Lu Gang , Wan Hong , Liu Can Cheng , Wang Fang , Zou Xun
Published: October 2011

The dimensional accuracy of shells and binders of investment casting which incorporation with selective laser sintering is investigated. The results show that the dimensional accuracy of colloidal silica is higher than that of ethyl silicate, and the dimensional variation rate of investment casting shells produced with colloidal silica is much lower than ethyl silicate shells. Moreover, colloidal silica possesses better performance on environmental protection and production cost control. These indicate that the comprehensive properties of colloidal silica are better than that of ethyl silicate. Meanwhile, the average dimensional variation rate of the single colloidal silica shell and the ethyl silicate-colloidal silica alteration shell was almost identical and it was much lower than that of the other shells which were produced in this study. This means two kinds of shells are optimized in all five types of shells studied in the aspect of dimensional accuracy. The unique properties of two shells show clearly direction to choose the type of shell.
Discussion Scanning Mode of Direct Laser Fabrication Quality Influence
Authors: Wang Fu Yu , Liu Wei Jun , Bian Hong You , Kong Yuan , Zhao Yu Hui
Published: October 2011

Abstract The titanium alloy direct laser fabrication process, the collapse of a side issue has interference and preventing the forming quality and forming precision. This thesis mainly contain with of temperature field analysis and actual observation, by changing the scanning mode to solve this issue. The new scanning mode, dam-type, has a good property and proves that the direct laser fabrication parameters can be complete without change through the whole forming process, and puts the process of control simply.
Thermal Design of a Sealed Air Cooling Local Environment Control System for Precision Instruments In-Vehicle
Authors: Li Hong Cai , Chen Fei Fan , Dong Yong Gui
Published: October 2011

Local environment control system (LECS) has been widely used in many areas as the necessary guarantee for most precision instruments. A sealed air cooling constant temperature box with dual-chamber structure that can provide constant working condition for precision instruments in-vehicle was developed. According to the heat transfer analysis of the double plate-fins heatsink, the heat radiation area and dimensions were determined based on electrical analogy. The air flow rate and temperature distribution of the system in heat steady-state was simulated by CFD software, and the results are consistent with that of experimental test. In different conditions, the thermal test results indicate that when the heat flow rate in the inner chamber is about 170 W, the temperature difference between inner chamber and environment is no more than 6.5 °C. The thermal design and test methods can be as the reference for the design of other precision instruments in-vehicle.