bluuebunny/crossref_metadata_2025 huggingface dataset:
Formation of the Cast Iron Coatings Plasma-Sprayed at Different Substrate Temperatures
Authors: Xing Ya Zhe , Jiang Chao Ping , Chen Hong , Hao Jian Min
Published: December 2010

In this work, three cast iron coatings were produced by atmospheric plasma spraying. During spraying, the surface temperature of three coatings (substrate temperature) was controlled to be averagely 50oC, 180oC and 240oC by changing the processing parameters. X-ray diffraction (XRD) was employed to analyze the phase structure of the starting powder and the coatings. The results showed that the powder was mainly composed of (Fe,Cr)7C3 and martensite and both the spraying processing and the substrate temperature exerted no influence on coating phase structure. An optical microscope (OM) was used to characterize the microstructure of the cross-section and surface of the coatings. It was found that the cross sectional hardness increased with the increase of the substrate temperature due to the improvement in interlamellar bonding.
Wear and Breakage Features of Multi-Coated Tools in Turning Hardened Steel
Authors: Hou Zhi Gang , Zhao Jun , Xu Li Qiang , Guo Zhong
Published: December 2010

The wear and breakage features of TP1000 multi-coated tool were investigated through a series of cutting experiments. These experiments were performed for turning hardened 45 and T10A steel by orthogonal experimental method. SEM and XRD analysis were conducted on cutting tools. The results show that both wear and breakage occur when turning hardened 45 steel. The major wear mechanism is abrasion and oxidation, and the major breakage mechanism is surface spall. When turning hardened T10A steel, the main disability is breakage, and the major breakage mechanism include surface crack, spall and tipping.
Weighted Cost Rate-Based Heuristic Scheduling Method for Semiconductor Furnaces
Authors: Lu Zhi Qiang , Zhou Bing Hai
Published: December 2010

In semiconductor wafer manufacturing, furnaces are mainly used for diffusion and deposition operations. During operations, wherever a furnace becomes available, scheduling the next batch deals with decisions on a batch which operation to process next and how many wafer lots to group the batch. To resolve the mentioned scheduling problem of the furnace where existing multi-products and different due dates, a heuristic dynamic scheduling algorithm called WCRHA (weighted cost rate heuristic algorithm) is presented to minimize the objective value of the waiting cost per unit time based on due date constraints. Simulation results show that the proposed algorithm is valid and feasible. Compared with the previous dynamic scheduling algorithms, it is more efficient in ensuring delivery and reducing completion time.
Characterization of Polyvinyl Alcohol-Polyaniline Blend Films
Authors: Zhang Wang Xi
Published: December 2010

In this study a solution-blend method is adopted to prepare conductive polyvinyl alcohol (PVA) and polyaniline doped with dodecyl benzene sulfonic acid (PVA/PANI-DBSA) blend films. Emeraldine base (EB)-type polyaniline (PANI) is dissolved in N-methyl-2-pyrrolidinone (NMP) and then blended with PVA/dodecyl benzene sulfonic acid (DBSA) solution by various amounts. The morphological structures and characterized of the films were observed via scanning electronic microscopy (SEM), thermogravimetric analysis (TGA) and X-ray powder diffraction (XRD). Electrical properties of the blends were characterized by means of electrical conductivity measurements. It is found that the electrical conductivity and the thermal degradation onset temperature of the PVA/PANI-DBSA blend film are increased as the amount of PANI-DBSA is increased.
Thermal Analysis of Concentrated Photovoltaic System
Authors: Zhang Hai Tao , Wang Zi Long , Zhang Hua
Published: December 2010

Studying the thermal process of concentrating system could help us better understand how photovoltaic system works and seek ways to increase electricity production so as to reduce the cost of power generation. Energy transfer of concentrating photovoltaic system includes the process of light to electricity and the process of direct current to alternating current. This paper presents the factors that affect the energy transfer efficiency of the former one. And at last author points out that the key factor to increase the power production of photovoltaic system is controlling the temperatu- re of solar cell.
The Constrained Stress-Induced ε Reverse Martensitic Transformation Characteristic of Fe-Mn-Si Alloy Embedded in Cement Matrix
Authors: Liu Lin Lin , Lin Cheng Xin , Zhou Chao Yu
Published: December 2010

The constrained stress-induced ε reverse martensitic transformation characteristic of Fe-17Mn-5Si-10Cr-5Ni shape memory alloy wire embedded in cement matrix was studied by X-Ray Diffraction (XRD) and metallographical. The results show that the finish temperature (Af) of the constrained reverse transformation of Fe-17Mn-5Si-10Cr-5Ni shape memory alloy in cement matrix, compared with the unconstrained alloy, is elevated. With increasing the pre-strain, the Af is higher, and reverse transformation temperature zone is broadened. The main result which causes martensitic reverse transformation harder is that Fe-Mn-Si alloy deformation coordination is limited by cement matrix constrained.
Effect of Mn Doping on the Photocatalytic Photodegradation Properties of Zn1−xMnxO Nanomaterials
Authors: Men Chuan Ling , Li Hong Qin , Zhang Hua
Published: December 2010

We study the effect of Mn doping on the photocatalytic photodegradation properties of Zn1−xMnxO nanomaterials to the methyl orange. The Zn1−xMnxO powders and thin films were synthesized by the sol-gel, spin coating and high temperature annealing processes. UV-visible (UV-Vis) spectroscopy was used to examine the radiated and non-radiated samples to study their photocatalytic photodegradation property of the methyl orange. Our results showed that Mn doping can enhance the decolorization efficiency of methyl orange at optimal Mn doping levels, and there exists an optimum Mn doping (x~0.18) at which photodegradation efficiency is nearly optimized.
Mould Design of Self-Healing Composite Gear
Authors: Zhang Li , Bu Xiao Yuan , Gong Yan Jue
Published: December 2010

According to the characteristics of the self-healing composite gear, the mould for gear is designed elaborately in this paper including the selection of mould type and material, the structure design of injection mould and gating system, the verification of injection parameters and the design of the demoulding mechanism. It provides good foundation for further manufacture and property analysis of the self-healing composite gear.
Investigation on the Effect of Crack Length on Mechanical Properties of Functionally Graded Materials
Authors: Chen Gang , Zhao Xi Yu , Zhai Peng Cheng
Published: December 2010

In this article, the thermo-mechanical responses of ceramic/metal functionally graded thermal barrier coating(TBC) in work environment are analyzed by a finite element method. Both the crack-tip field and the stress intensity factor of functionally graded TBC are analyzed and calculated. It is discussed that the effect of crack length on mechanical properties of functionally graded TBC in the condition creep and no creep of pure metal. The numerical results indicate that the effect of crack length(a/t) is negligible to temperature distributions and the maximum displacements of whole model but remarkable to the 1st principal stress and stress intensity factor of crack region. Moreover, creep phenomenon of pure metal can relax the value of displacement, stress and stress intensity factor but do not alter their distribution.
Structure and Electrochemical Properties of Li1-XNi0.5Mn0.5O2 Thin Film Using Different Raw Material by Sol-Gel Method
Authors: Liang Hai Xia , Jiang Run Xia , Xiao Liang , Liu Han Xing
Published: December 2010

Lithium-deficient thin films Li1-xNi0.5Mn0.5O2 were synthesized by sol-gel method using metal lithium, manganese and nickel acetate salts and acetylacetonate salts as started materials, respectively. The microstructures and electrochemical performance of Li1-xNi0.5Mn0.5O2 thin films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and galvanostatic charge–discharge measurements. Lithium-deficient was due to the formation of spinel LiNi0.5Mn1.5O4 impurities. The lithium-deficient was more seriously for SB film due to contain crystal water in the acetate salts. The raw material had great influence on the morphology of the films. The SA film had better electrochemical properties than that of SB film. The first discharge capacity was about 51 μAh/cm2-μm. After 40 cycles, 76% of its discharge capacity can be retained. The metal acetylacetonate salts without crystal water are more suitable for the preparation of LiNi0.5Mn0.5O2 film by sol-gel method.
Poly (Lactic Acid)/Wood Fibers Biodegradable Composites
Authors: Guo Ming Hui , Yuan Yuan
Published: December 2010

In our research, a commercial poly (lactic acid) (PLA) film was used in combination with wood fiber matrix to generate biodegradable composites by a film stacking technique and hot-press. The results showed the flexural properties and water resistance increased with the increasing of PLA addition. Silane-treated wood fiber composites significantly improved the flexural properties compared to untreated composites. In experiment range, the physical and mechanical properties of composites were better in higher hot-press temperature. The optimal parameters are determined by PLA addition 20%, silane addition 3%, the hot-press temperature 190°C, the hot-press time 10min.Under these parameters, the flexural properties of composites exceeded the requirement of the outdoor boards’ standard, but the water resistance was a little low.
Surface Roughness Prediction in Precision Surface Grinding of Nano-Ceramic Coating Based on Improved ANFIS
Authors: Guo Xiong Hua , Liu Mao Fu , Zhao Chang Rong
Published: December 2010

For improving surface integrity and machining quality after precision grinding of the parts of nano-ceramic coating, and investigating its prediction technique of surface roughness, the prediction model of surface roughness in precision surface grinding of nano-ceramic coating based on adaptive network-based fuzzy inference system (ANFIS) was proposed in this paper. Then, the proposed prediction model was improved by hybrid Taguchi genetic algorithm (HTGA). At last, by comparative analysis of prediction results from traditional BP neural network model, simple ANFIS model and improved ANFIS model, the effectiveness of the proposed model was verified using grinding parameters and measured surface roughness in grinding tests as training and testing samples. It showed that the prediction accuracy of the improved ANFIS model proposed in this paper was higher, and it was an effective prediction method of surface roughness in precision grinding of nano-ceramic coating.
Residual Stress in Powder Metallurgy Green Compact
Authors: Zhou Rui , Zhang Lian Hong , Liu Yu Hong
Published: December 2010

Residual stress in green compact is an important factor to influence the quality of the compact and corresponding powder metallurgy product. To understand the residual stress, a finite element model is set up to simulate the single and double action pressing, unloading and ejecting of powder compacting process. Results show that compaction type has significant influence on the rule of residual stress state and the double action pressing is more helpful to reduce the risk of cracking than the single action pressing. Also better lubricant condition is beneficial to improve residual stress in the green compact.
Temperature and Rate-Dependent Constitutive Relationship for Vanadium Alloy V-5Cr-5Ti and Failure Modes
Authors: Huang Xi Cheng , Hu Wen Jun , Yan Yi Xia , Xie Ruo Ze , Zhang Fang Ju , Chen Yong Mei , Mei Jun
Published: December 2010

In this work the static and dynamic properties of vanadium alloy V-5Cr-5Ti over a wide range of temperature from 20 to 1000 degree at strain rates ranged from 10-4/s~103/s were studied experimentally under uniaxial quasi-static tension with MTS universal testing machine, uniaxial dynamic compression and tension with split Hopkinson bar system with temperature control. The stress-strain curves of V-5Cr-5Ti at various temperatures and various strain rates were obtained. Experimental data show that V-5Cr-5Ti behaves strain-rate sensitive and temperature dependent, for instance the material parameters yield stress, tensile strength and failure strain. And fracture mode of the material is also dependent on strain-rate and temperature. Based on experimental data the temperature-rate-dependent constitutive relations were established in the form of Johnson-Cook and Cowper-Symonds models which are widely used in numerical simulation of dynamic processes of structures under impact loading. The material microstructures and failure modes were analyzed using optical microscope, TEM etc, and results shows that the yield stress and strength are increased with strain rate. The brittle-ductile transition strain-rate is from 101/s to102/s.
Numerical Simulation on Drop Test of the Conical Shell
Authors: Yan Yi Xia , Xu Wei Fang , Huang Xi Cheng , Chen Gang , Hao Zhi Ming
Published: December 2010

The drop test for the thin 2A12 conical shells was developed on a drop hammer. The dynamical responses, typical deformation histories and failure mode of the shells were presented. The drop impact response of the thin conical shells were numerically simulated and analyzed in detail by using the explicit, nonlinear transient dynamic code, LS-DYNA. In the calculation, the material plastic behavior of the conical shells was described by Johnson-Cook constitutive relationship, which includes the effects of the strain rate, strains harden and temperatures soften. The deformation and failure model of the conical shell obtained from the numerical simulation were consistent well with the experiment. It was shown that the calculation method, material model and the failure criterion were available. The test and numerical simulation results were all shown that the failure mode was different because of the different drop height.
Durability of Concrete Structure Research and Development Direction
Authors: Jiang Lei , Yao Ji Tao , Xin Ren , Li Wei
Published: December 2010

Currently, durability of concrete structures is a hot area of civil engineering. This paper reviews the background to the study of concrete and the current international research developments. Recent accomplishments in the world are summarized on four levels—environment, materials, components, structure. Finally, directions of future research are also proposed.
Static and Dynamic Behavior of Granite in Split Tension
Authors: Chen Gang , Kuang Yu Chun , He Peng , Xu Ai Ming
Published: December 2010

Tensile strength is one of the most important mechanical properties of granite. It is a key parameter for strength design, safety analysis of granite structures. In the present paper, experimental investigation on static and dynamic splitting tensile behavior of granite is carried out with Brazilian disc (BD) test. The incident wave of SHPB for the dynamic BD test was designed with pulse shaper. The results show that the dynamic tensile strength of granite is heightened with increasing strain rate.
Influence of Heat Treatment for the Microstructure in GCr15 Bearing Steel
Authors: Xie Fei Ming , Wang Yan Lin , Xiang You Yang , Zhang Qing
Published: December 2010

The influence of microstructure in GCr15 bearing steel by the different heat treatment conditions was studied, and the influence regular pattern of recrystallization percentage in GCr15 bearing steel by the different deformation amount, deformation temperature and dwell time after rolling was also analyzed. The research results show that when the deformation temperature and deformation amount under certain conditions, the recrystallization percentage of deformed austenite in GCr15 bearing steel increases as the dwell time after rolling increases, and the austenitic grain is also grow up; The uniformity of deformed austenite organization is influenced greatly by the different deformation amount, deformation temperature and dwell time after rolling, when the deformation temperature is 950 °C, the deformation amount is 45% and the dwell time after rolling is 100 S, the recrystallization percentage can up to 84.57%.
Erosion Wear Behavior of TiAlCrN Coating on Hard Metal Impacted by Solid Particles
Authors: Wu Feng Fang , Deng Jian Xin
Published: December 2010

The erosion wear resistance of TiAlCrN coating on a hard metal deposited using unbalanced magnetron sputtering technique was investigated by comparison with that of the TiN coating deposited by filtered vacuum arc deposition. SEM was used for observing the surface morphologies of coatings both the un-eroded and eroded. Scratch test was used to evaluate the adhesion of the coatings. The erosion wear was tested with a gas blast apparatus at room temperature. In the test, the coatings were impacted at an impingement angle of 90° by angular SiC solid particles with an average diameter of 124um. The maximum depth of the erosion scar measured by the optical profiler was used to evaluate the erosion wear loss of the coatings. TiAlCrN coating proved to have much lower erosion rate than TiN coating. Different from the typical brittle erosion behavior of TiN coating, the TiAlCrN coating behaved like a semi-brittle material.
Homogenization Analysis of Effective Mechanical Properties of Nano-Composites with Non-Linear Material Components
Authors: Zhou Ying Long , Luo Dong Mei
Published: December 2010

Combining the cohesive zone model into the homogenization method, the effective mechanical properties of nano-composites with debonding interface and the non-linear matrix phase are analyzed. The matrix phase is considered as bilinear material satisfying the von Mises conditions in the presented algorithm, and a simple elastic–plastic constitutive model is established for a periodic microscopic representative volume element (RVE) to study the longitudinal Young’s modulus and shear modulus of nano-composites. The results show that the non-linearity of material components can degenerate the effective materials properties, and the shear modulus is more sensitive to the debonding length of interface and the change of yield stress of matrix phase.
Optimization of Channel Dimensions in the Flow-Field for PEMFC
Authors: Wang Le Ping , Zhang Lian Hong , Jiang Jun Peng
Published: December 2010

This paper focuses on the improvement of the distribution uniformity and consumption rate of the hydrogen (H2) in proton exchange membrane (PEM) fuel cells via optimization of the channel dimensions in the flow-field of bipolar plates. Based on the half-cell model for the anode side numerical simulation is carried out with computational fluid dynamics software Fluent. The method of DOE (Design of Experiment) is used in the simulation, and the results show that channel depth is the most influential factor to H2 consumption rate, channel width comes second, and land width has the least influence.
Simulation of the Effects of Boundary Energy on Microstructure Evolution in Nanocomposite Ceramic Tool Material
Authors: Cheng Hong Mei , Huang Chuan Zhen , Liu Han Lian , Zou Bin , Zhu Hong Tao , Zhao Jun
Published: December 2010

A Monte Carlo Potts′ model with different ratios of grain boundary energy is proposed for the sintering process of two-phase nanocomposite ceramic materials. The grain growth process is successfully investigated, and the effect of grain boundary energy on the microstructure is discussed. The simulation results show that the competition between grain boundary and interfacial energies can affect the pinning effect of nano-particles, lead to various microstructure. The simulation results are in accordance with the experiments.
Study on the Effect of WC-Co Macro Interface Structure on PDC Performance
Authors: Fan Wen Jie , Liu Fang
Published: December 2010

This paper focuses on the research for the performances of 5 typical macroscopic interfaces at normal temperature and after heating, such as, planar structure, v-groove, u-groove, and ring groove and ring claw-tooth. With SEM, we study on different impact resistance for PDC due to these 5 typical macroscopic interfaces, analyze the reason why PDC performance varies with macro interface changes of WC-CO alloy, and find it greatly eliminates PDC internal defect and improves impact resistance if the macro interface of WC-CO alloy is multi-plane shape (e.g. ring claw-tooth).
Mechanism of the Effect of Interface Structure on the Thermal Stability of Polycrystalline Diamond Compact
Authors: Fan Wen Jie , Liu Fang
Published: December 2010

Thermal stability is an important performance parameter of polycrystalline diamond compact. This paper focuses on the research for test method of PDC thermal stability performance. With the improvement method, the thermal stability performance of PDC with five typical macroscopic interface structure such as planar structure, v-groove, u-groove, ring groove, ring claw-tooth are tested at normal temperature and after heating, With SEM, we study on its mechanism of thermal stability performance due to different macroscopic interfaces structure, analyze the reason why PDC thermal stability performance is different with the changing of PDC macroscopic interface structure. The research result shows that the temperature influenced the wear property and the anti-impact property of PDC obviously. And it has great influence on the anti-impact property. The thermal stability of the vessel-shaped interface structure is better than the flat interface structure.
Texture Based Infrared Military Target Extraction
Authors: Jia Yong Jiang , Gao Tao , Zhao Jian Tao
Published: December 2010

The innovation of this paper is that it forwards a new algorithm of target extraction form military infrared images with texture background according to the Mean-shift smooth and segmentation method combined with eight directions difference clustering. According to the texture characteristics of background image, smoothing and clustering are both carried out to extract the characteristics of target. The method is relatively simple making it easy for practical applications. The experimental results show that the algorithm is able to extract the target information form complex military infrared texture background with better self-adapting and robustness.
The Biaxial Stress-Strain Curves of Sheet Metals
Authors: Wang Hai Bo , Wan Min , Yan Yu , Wu Xiang Dong
Published: December 2010

Biaxial tensile tests of 5754O aluminum alloy sheet and B170P1 steel sheet were performed under linear loading paths with cruciform specimens and a biaxial loading testing machine. The stress-strain curves under different loading paths were obtained. It is found that the loading path has a significant influence on the stress-strain curves, i.e., the stress-strain curves vary with the loading path. The stress-strain curves in the rolling direction become higher with the decrease of the loading ratio (the ratio of the load along the rolling direction to that along the transverse direction) from 4:0 to 4:4. Meanwhile the stress-strain curves in the transverse direction become lower with the decrease of the loading ratio from 4:4 to 0:4. Based on Yld2000-2d yield criterion, the experimental phenomena of the two kinds of sheet metals under biaxial tension were explained theoretically.
Influence of Structural Sealant on Mechanical Behavior of Hidden Frame Curtain Wall
Authors: Wang Na , Ma Juan Rong , Liu Hai Bo
Published: December 2010

The influence of structural sealant on mechanical behavior of hidden frame curtain wall was analyzed by using uniform negative pressure tests. The glass panel used in hidden frame curtain specimen is monolithic toughened glass. The dimension of the glass panel is 1000mm×1000mm and its thickness is 6mm. The dimensions of structural sealant in the three specimens are 9mm×8mm, 12mm×8mm and 15mm×8mm respectively. Test results indicated that the maximal principle stress and deflection of every test point increased linearly with the increasing of the uniform load from 0.5kPa to 2.0kPa. The variable regulation of maximal principle stress and deflection was not linear relation with the increasing of adhesive width. Through test and result discussion, the size effect of structural sealant on the hidden frame curtain wall system was summarized.
Design of a Flexible Bending Biomimetic Octopus Arm Unit with Embedded SMA Wires
Authors: Wang Yu Kui , Guo Cheng , Li Jian , Wang Zhen Long
Published: December 2010

This paper discusses a design of a flexible bending biomimetic octopus arm unit. Firstly, bending function of the octopus arm is analyzed. Secondly, the structure of the arm unit driven by shape memory alloy (SMA) is presented which can realize flexible bending. Meanwhile, mechanical model of the arm unit is established to find the proper parameters of the arm unit. Finally, experiments are carried out to demonstrate the feasibility of the structure.
Determination of Mercury Ions by Using Nano Gold Plate Electrode Based on Amino Thiol Self-Assembled Film
Authors: Cao Zhong , Long Shu , Shi Xiang , Zeng Ju Lan , Sun Li Xian , Yang Rong Hua
Published: December 2010

The electrochemical behaviors and sensing application of 100nm-gold plate electrode based on 6-amino-1-hexanethiol (6-AHT) self-assembled monolayer (SAM) have been investigated in this paper. The 6-AHT assembled nano gold plate electrode exhibited a nice linear potential performance of responding to Hg2+ in the range of 1.0×10-8—1.0×10-6 mol/L with a slope of 42.57 mV/-pC (25°C) in Tris-HCl buffer solution (pH=5.0). No obvious interferences were observed from Na+, K+, Ba2+, Mg2+, Ca2+, and Cr3+. The detection limit can be evaluated to 8.0×10-9 mol/L. In addition, the electrode possessed good stability and reproducibility with a recovery rate of 96.50-103.67%, indicating that it can be used for the determination of Hg2+ content in environmental waste water samples. The sensing mechanism of 6-AHT monolayer has also been discussed by the formation of coordination structure between amino groups of the thiol molecules and the mercury ions.
Fatigue Test Research for SPR Aluminum Alloy Sheet
Authors: Zhao Jing Hua , Wan Shu Min , Li Shuang Yi , Liu Feng
Published: December 2010

In this paper, the fatigue behavior of self-piercing riveting (SPR) joints is compared with resistance spot welding (RSW) joints for the same A6063 aluminum alloy sheets. The fatigue test, where every specimen is tested under different load, is conducted on MTS810.23M testing machine, and the results show that SPR joints have superior fatigue performances. Next S-N curve of every specimen is deduced after regression analyses of test data and the fatigue damage rule of SPR aluminum alloy sheets is summarized. Finally the effect of test parameters and errors on fatigue life of RSW and SPR joints is evaluated with two-factor and multiple factor analyses of variance.
Research on Fiber-Optic Strain Signal Processing Based on Demodulation Technique
Authors: Du Xiao Wei , Li Li Rong
Published: December 2010

A higher performance signal processing module is demanded because of the high sensitivity of fiber-optic sensor probe. Excellent signal processing module is expected have the function of restore the sensor signal and very little to the introduction of noise. In this paper, improved demodulation algorithm is proposed based on the general demodulation algorithm through changing certain parameters of the algorithm aimed to improve the quality of the signal after demodulation. The output signals of scene sensor probe is sampling, sampling data through filtering. By using the improved fiber optic sensor signal demodulation algorithm, the system can fully improve the quality of the signal after demodulation under the premise of maintains the minimum sampling rate.
Simulation of Electrolytic Cleaning for Cold Rolled Strip
Authors: Jia Xiao Fang , Nie Chao Yin , Liu Xiao Kui , Zeng Zhi Jun , Gao Peng Fei
Published: December 2010

The electrolytic cleaning process was studied in view of simulation. It is supposed that remaining dirt on surface of strip is evenly distributed before electrolytic cleaning with thickness of d, a bubble (radius of r) generated from strip can remove dirt with the volume of 4πr2d, and in the process of a bubble generated the thickness of the dirt (d) keeps invariant. Under the premise of simplified conditions, taking Faraday’s Law as a starting point main model had been built. And so expressions of the relations between process parameters and decontamination ratio were obtained. The results of experiment accord with those of simulation. Based on the model, using mixed program of Matlab and Visual C++, the simulation program software was developed. The results show that the way to simulate original electrolytic cleaning process of cold rolled strip is feasible.
Design of Thermal Transferring of Plane Mould for Low Pressure Sheet Molding Compound
Authors: Li Jian , Huang Zhi Xiong
Published: December 2010

Mathematical simulation of mold flow of glass fibers and design of heat transferring of plane mould for low pressure sheet molding compound were analyzed and optimized by MATLAB software in this article. The flexural properties of specimens molded in conventional and thermal-deign optimized mould were compared. The fracture surfaces of specimens were carefully investigated by SEM, too. The results show that the surface temperature of the mould was highly uniform during the process of curing when the distribution of the heating pipes in the plane mould was optimized. The flexural strengths of the specimens, cut from the center and the corner of the parts molded by thermal optimized mould, are almost the same and can reach about 170MPa. And the distribution of glass fiber with high weight content adhering well with resin is uniform in the fracture area.
Automatic Inspection of Typical Microstructure Defects Based on Image Processing Techniques
Authors: Chen Xiao Hui , Liu Xiao Jun
Published: December 2010

Micro-structural defects influence the performance of MEMS devices. For effective quality monitoring and assurance in mass-production of MEMS devices, it is necessary to conduct automatic defect inspection. In this paper, an approach based on image processing for automatic microstructure defect inspection is presented. In the approach, an Influence Region Template is built based on a reference microstructure image while it preserves the framework and restrains the tiny distortion of the reference, then the test microstructure image is compared with the Influencing Region Template for quality evaluation. By the approach, typical defects such as blocks in trenches or channels, transfixions between trenches or channels and missing of some part and so on, are detected and classified automatically, while some distortions which do not affect the function of the microstructures are ignored. Testing results show that the approach can conduct a high quality assurance while it can endure a given distortion tolerance of microstructures.
Fracture Test on High Strength Steel Plates with Elliptical Hole
Authors: Wang Wan Zhen , Huang You Qian , Su Ren Quan , Wang Xin Tang
Published: December 2010

In order to study fracture mechanics of high strength steel with the moderate thickness, fracture tests were performed on 10 plates with elliptical hole fabricated from high strength steel Q345 with the thickness of 16mm. The effect of the notch sharpness (the ratio of the length of short axis to that of long axis of elliptic hole, b/a) and the notch depth (the ratio of the length of long axis of the elliptic hole to the width of plate, 2a/w) on fracture model of high strength steel was examined. Test results show that the first crack initiates at the notch edge. The fracture ductility is lower for the specimens with the sharper notch (a smaller ratio b/a) and the deeper notch (a larger ratio 2a/w), and the point of crack load lies in hardening phase of load-displacement curve. The fracture ductility is higher for the specimens with the obtuse notch (a larger ratio b/a), and the point of fracture load lies in necking phase of load-displacement curve. The ultimate strength of notched plates is independent of the notch sharpness (b/a) and the notch depth (2a/w).
QFD-Based Analysis of Quality Functional Requirements of Wooden Acoustic Panels
Authors: Guo He Miao , Yu Hai Peng , Zhang Bin
Published: December 2010

As the WAP (Wooden Acoustic Panel) is a kind of newly-emerged functional and decorative building material, this dissertation conducted a scientific analysis on its qualitative and functional design requirements. The method of QFD (Quality Function Deployment) was introduced in this dissertation. Through market survey, voice of customer about qualitative requirements on the WAP was obtained, while a customer needs deployment table was gained based on requirement transformation and clustering. Then a technical requirement deployment table was prepared corresponding to the customers’ requirements. Finally, the quality house for product plan and location of components were acquired. The result indicates that the quality and function requirement of WAP obviously cover the following perspectives: firstly attaching great importance to improvement in acoustic absorption and price reduction, specifically paying attention to material selection of core materials, panel thickness, punching rate and aperture; secondly taking environmental protection and decorative function into consideration which means to concern surface material selection, decorative function and glue joint technique, and finally thinking about the sizes of panels and convenience in installation.
Galloping of Transmission Tower-Line System and Anti-Galloping Research
Authors: Li Li , Jiang Wei , Cao Hua Jin
Published: December 2010

A nonlinear finite element model of transmission tower-line coupling system including transmissions, towers and insulators is established based on ANSYS in this paper. The restarting technology is proposed to solve the vertical, horizontal and torsional galloping of the transmission conductors. Under the condition of different wind velocity, galloping of tower line system is performed to get amplitude of the transmissions and internal forces of the transmission towers. Based on the typical case, the galloping control measures of using interphase spacers and multi-point weighting are performed. Various layouts projects of the galloping control measures are carried out and the effective ones are attained.
Comparative Research on Stochastic Resonance of Piecewise-Linear Model and Bi-Stable Model
Authors: Wang Lin Ze , Zhao Wen Li , Xia Bei Bei
Published: December 2010

A new piecewise-linear stochastic resonance model was proposed in this paper. Using numerical simulation, the model was compared with nonlinear one-dimensional continuous bi-stable system on response to period signals under both noisy and non-noisy circumstances. Comparing with contrasting model, there is no output response saturation phenomenon, and the output will increase greatly with the increasing of input signal. To input signal with noise, there is larger applicability to noise intense, especially to weak signal with large additive noise, still there is stochastic resonance. It is superior to contrasting model.
Multiple Performance Optimization for the Best Injection Molding Process of Ti-6Al-4V Green Compact
Authors: Muhamad Norhamidi , Mohamad Nor Nor Hafiez , Ahmad Sufizar , Ibrahim Mohd Halim Irwan , Harun Mohd Ruzi
Published: December 2010

The L27 (313) Taguchi orthogonal array is used in the experiment while the injection pressure, injection temperature, powder loading, mold temperature, holding pressure and injection speed are optimized in this study. A grey relational grade (GRG) obtained from the grey relational analysis (GRA) is used to solve the titanium alloy powder injection molding operations with the multiple performance characteristics such as strength and density. From the analysis of variance (ANOVA), the injection temperature has the highest contribution at confidence level 90% to the quality of green part followed by powder loading. The others factor such as mold temperature, holding pressure, injection pressure and injection rate and all the interactions are not significant even though it give contribution during injection molding but the confidence level are less than 90%.
Research on Dynamic Characteristic Testing Method for Large-Scale Rolling Mill Servo Cylinder
Authors: Liang Yuan Yuan , Huang Fu Xuan , Chen Kui Sheng , Chen Xin Yuan , Fu Shu Guang , Huang Zhi Wu
Published: December 2010

Through the analysis of the current researches on servo cylinder dynamic characteristic testing methods, this paper puts forward a new testing method of dynamic characteristic on large scale rolling mill servo cylinder, and elucidates the composition and testing method of the hydraulic system. It introduces the process of computer aided testing system and analyzes the dynamic characteristic of the frame. The testing system has been to realization in a test bench developed for a company.
Study on the Fatigue Reliability Model Based on Probability Distribution of Fatigue Life under Spectrum Loading
Authors: Wu Ying , Xie Li Yang
Published: December 2010

Under variable amplitude load history the exact distribution of fatigue strength corresponding to a specified number of life cycles cannot be obtained exactly by test, fatigue strength distribution can be obtained from fatigue life distribution. According to statistical property analysis of Miner cumulative damage rule, probability distribution of fatigue life under variable amplitude load history is predicted based-on constant amplitude median Sa-Sm-N surface. In the end, a fatigue reliability model is established to calculate fatigue reliability according to stress distribution as well as fatigue life distribution function. The model is applicable to calculate fatigue reliability under stochastic load environments.
Stress Calculation of Fillet Rolled Crankshaft in Bending Fatigue Tests
Authors: Bao Ke , Liao Ri Dong , Zuo Zheng Xing
Published: December 2010

The stresses around the fillet of fillet rolled crankshaft section in bending fatigue test are quite complicated, which include the residual stresses induced by fillet rolling process and bending stresses caused by bending fatigue test loads. In this paper, the corresponding three dimensional finite element models of roller- shaft are created and the residual stresses near the fillet of crankshaft section are obtained by flexible-flexible contact computation. Then the transient analysis of bending fatigue test based on modal superposition method is carried out and the bending stresses are got. The results of stress can be used to the bending fatigue design of crankshafts.
Epoxy Specimen Fabricated by Rapid Prototyping Method for Photo-Elastic Technique
Authors: Liou Chiou Lin , Tsai Hsi Hsun
Published: December 2010

Stress concentration due to the circular hole within the mechanical part is concerned during design phase. The stress concentration of the circular hole within the mechanical mart can easily derived by the photo-elastic technique if the testing specimen is sufficiently developed. The testing specimen using the characteristic of the photo-elastic coefficient, with actual form like the mechanical part by rapid prototyping forming is thus used in this paper. The rapid mold for prototype is made by the RTV-2 silicone gel associated with the vacuum chamber to remove the air within it. Totally twelve specimens divided into two sets, the first set with the machined holes by milling at the centroid of the specimens with diameters of 5, 8, 10, and 12 mm. The second set with the formed holes by molding with the previous diameters. The testing scheme is by way of the simply supported beam where the load is imposed on the middle of the specimen. Results show that the smaller diameter of hole on specimen provides a larger stress concentration effect. When the diameter of the hole is small, the stress concentration effects caused by the machined hole and the forming hole have almost no difference. However, the stress concentration effects of the larger diameter of the machined hole and of the formed hole give significant difference, the stress concentration caused by the machined hole is much greater than one of the formed hole. In this paper, the actual shape of the specimen which is as same as the original mechanical components can be quickly obtained by the rapid prototyping technology for the photoelastic technique to reveal the experimental mechanics of real applications.
The Study of Chemistry Precipitation Method Extraction Magnetic Ferric Oxide from Chromium Dregs
Authors: Li Xiao Yan , Hu Hong Wei
Published: December 2010

In view of chromium dregs is deleteriousness, harms humanity's health, this article uses chemistry precipitation method to carry on the disintoxicating for it, and prepares the magnetic Ferro ferric oxide. The feeling coupling plasma atomic emission spectrum method to analysis purity and yield of magnetite Ferro ferric oxide, and then discussed the concentration, temperature and concentration of precipitation agent yield and purity.
A Design in the Optimal Precision Forging Process about Transmission Shaft Flange Yoke
Authors: Tong Ying
Published: December 2010

The rigid-visco-plastic finite element model for the hot forging process of transmission shaft flange yoke was established, and two forging schemes of different male die shapes were simulated. As for the present forming process, the forming defects were indentified and analyzed. Based on the simulating results the decision-making process was obtained, and a preforming die and a final forming die with proper structures and longer life were designed. The transmission shaft flange yoke part produced by this process is excellent in dimension tolerance and mechanical property. This process is profitable reference for producing the similar type of forks with complex shape.
The Kinetics Model Study of Al-Fe In Situ Composites and Applications
Authors: Liu Jiang
Published: December 2010

Through the reaction model of Fe powder in liquid Al melt, constructed the dynamic model of Al-Fe reaction and analyzed it’s forming kinetics of in-situ Al composites manufactured by reaction synthesis. The results showed that the time of Fe and Al complete response to forming strengthening phase has a square relation with the Fe powder original size in Al melt. According the kinetics model to improve the powder add method, and decrease the initial group size of Fe powder in the melt, can significantly accelerate the reaction. Then optimize stirring equipments and parameters to improve the microstructure and mechanical properties of composites.
Experimental Studies on Cold Extrusion of Thin Wall Ultra-Deep Blind Hole about 7A04 Recoil Spring Tube
Authors: Yang Shao Kui , Wang Long , Ma Yue Xin
Published: December 2010

This document introduces tentative designs of the cold extruding of thin wall ultra-deep blind hole about 7A04 recoil spring tube, its technical process and experimental result and analyses the existed problems and the reasons. These experimental studies have reference value for taking cold extrusion shape of 7A04 and ultra-deep hole.
The Effect of Splicing Shape and Interval Length on the Failure Mode of Laminated Composites under Tensile Condition
Authors: Zhang Guo Li , Wang Fu You , Li Jia Lu , Chen Guang Wei , Chen Li
Published: December 2010

This paper presents an experimental investigation on the failure modes of glass fiber reinforced 2D woven fabric with ladder splicing laminate composites. On the basis of [0/0/+45/90/-45/90]s ply sequence, six kinds of laminated performs with different splicing interval lengths which were 4mm, 8mm, 12mm respectively and two different splicing shape which were ladder splicing and double vertical line splicing, and a kind of laminated perform with continuous laminates of 2D glass fiber woven fabric were made. By means of RTM molding technology, the technological parameters of RTM processing were designed as follows: injection temperature was 25°C, injection duration time was 180min and injection pressure was 0.4MPa, the epoxy resin based 2D glass fiber woven fabric RTM laminated specimen were prepared. According to the GB/T 1447-2005 and GB/T 1449-2005standard test method, the failure modes of 2D glass fiber woven fabric laminated RTM specimen were tested. Results show that the failure modes of laminate composites manifest as rapid damage in the form of line inlay mode and wedge shape mode at 4mm interval length condition, and accumulating failure in the form of inlay layer slippage - fiber pulled out mode and fiber fracture - splicing layer deboning mode at 12mm interval length. Otherwise, all fracture position of splicing laminates occurs at the site of splicing line because of the concentration of tensile stress.
Experimentally Investigation of Curing Shrinkage of Extra Low Dilated Epoxy by Fiber Bragg Gratings
Authors: Cheng Chun Der , Tsai Hsi Hsun , Feng Hui Ping
Published: December 2010

The bonding adhesion with low shrinkage and coefficient of thermal expansion is really important for packaging of the photonic and optoelectronic elements. Lots of the thermoset glue is thus developed for this packaging. however, the curing shrinkage of the adhesion is relatively large. The silica filler is usually mixed into the epoxy for lowering the curing shrinkage and the CTE. In this study, the filler with negative CTE is derived to decrease the CTE and shrinkage of the composite epoxy. The fiber Bragg gratings is built in the composite of epoxy/filler. The adhesive composite is then put into the temperature cycle chamber for curing. At the meanwhile the FBGs during curing is on-line monitored by the Optical Oscillation Analyzer. Measuring the variation of the central wavelength of FBGs, the curing shrinkage of the composite epoxy with NCTE filler can be is derived. The results show that axial stress is increased drastically during the chemical curing stage. By application of this NCTE filler/epoxy adhesion, the property of the lower shrinkage is expected.
The Experiment for the Fracture Toughness of the Compound Bioceramic and the Analysis for the Confidence Level of its Reliability
Authors: Xu Shi Lian , Wang Rui Hong , Li Ruo Qi , Xu Ren Ping
Published: December 2010

The brittle is crippling the application of bioceramic. The compound bioceramic is a new biomaterial being widely applied in medical treatments and its fracture toughness is an important mechanical behaviors. In this paper, we introduce the manufacturing method of the compound bioceramic and experiment facilities for its fracture toughness, investigate its probability distribution for the experimental data and conduct the test for fit. We conclude that the experimental data for the toughness fracture of the compound bioceramic obey the two-parameter Weibull distribution, introduce the analyzing method for the upper confidence limit curve and lower confidence limit curve and study the reliability and confidence level of the fracture toughness of the compound bioceramic.