The eigenvalue is an important parameter to represent the stress singularity on the singular point of dissimilar linear elastic material wedges. An Airy stress function method has been used to calculate eigenvalues of the bi-material and trimaterial junctions by varying an interface angle 1 from 0-180°...

The flame used in combustion flame spraying is typical of a high-temperature free jet. The flow fields of free jets are multi-phase flows that couple the mass and heat transfer. This work develops an analytical method to describe free combustion spray jets. The aim of the research is to develop a fully...

The thickness of decarburization layer of crankshaft of JB36-400 press was simulated by the DEFORM-3D software. The results indicated that the minimum decarburization layer was obtained at 830°C and holding for 120min and the mechanical properties and performance can be met the requirements. The experiment...

We have researched the relationship between the luminescence properties, concentration changes, particle size of fluorescent particles and the additional scattering particles, and the random lasing threshold of a new disorder media. Maxwell equations and the rate equations are solved by using the finite...

In this paper, a new way to prepare controlled nano- MgO with different morphology facilely by using modified attapulgite as hard template was found. The morphology details were investigated by scanning electron microscopy (SEM). It was found that the morphology of nano-MgO particles was induced by the...

An effective parameterization method is proposed to optimize transition arc's shape between blot head and blot bar for minimum stress concentration. This method adopts super circular curve equation to describe transition arc’s shape, then selecting equation’s parameters as the design variables. Thus...

A numerical method is developed for the application of three-dimensional progressive damage analyses in composite laminates containing an open hole with arbitrary geometry and stacking sequence subjected to static compressive loading. The method developed is included in the three-dimensional FEM stress...

This paper has analyzed the basic theory and material constitutive relation of crashworthiness simulation. The finite element model for vehicle side crash has been built and the side crash simulation with an initial velocity of 50km/h has been conducted. Though the structure deformations analysis of...

This work investigates the forming behavior of polymer metal laminate (PML) in stamp forming through both experiment and finite element modeling. The effect of blank holder force on the PML forming was determined by comparing the strain evolution under different blank holder forces. A finite element...

Ni-nanoSiO2 composite coating was electrodeposited under ultrasound conditions, and the effect of ultrasound power on its microstructure, microhardness and acid resistance was investigated. SEM and XRD characterization show that ultrasound power has evident influence on the morphology, while shows hardly...

The influence of heat treatment on microstructure and mechanical properties of 3.5Ni steel has been studied in this paper. The experiment results showed that the microstructure and grain of the normalized and tempered steel exhibited a low uniformity, which deteriorated toughness. The grain could be...

The pilot wheel vane is one of important parts of hydraulic transmission. Its construction, processing precision and assembly can influence the function of the transmission directly. Since the shape of pilot wheel vane is very complicated, its modeling, processing and measure are the difficult points...

Concrete beams fatigue damage is mainly a problem in practical engineering , the fatigue failure mechanism than the destruction of the static bearing capacity mechanism is complex and influenced by many factors , a large number of experimental data shows that the fatigue life of the concrete beam is...

Bolt connection is one of the common connection methods in diesel engine. The purpose of this study is to verify the difference of considering the bolt connection or not in the shock response calculation. The methods applying in the study as following: first design the comparison test of welding connection...

In this study, Super fine magnesium hydroxide was synthesized by direct precipitation method. The influence of factors, such as reaction time, reaction temperature, solution concentration and the additive amount of dispersing agent on the particle size of MH were investigated. The properties of prepared...

In this paper, use the fuzzy AHP by the experimental filter, use polyalkylene glycol (PAG) as a base oil and additive blending. Likely to cause oil pollution in the cross-use of different lubricants for machining centers, resulting in the decline of the integrated performance of the machining center,...

Mechanical impurity and iron in particular of lubricating oil will increase, if transmission system in mechanical devices is worn. Therefore, it is particularly important to measure iron content of lubricating oil. There are several methods for detecting lubricating oil at present, but these methods...

As one of the main factors of lubricant contamination, moisture can cause the failures and life reduction of mechanical devices. For the purpose of replacing the polluted oil timely, a method of rapid detection of the moisture content is needed. By studying the measurement conditions including perturbation...

A major problem associated with the process of slowing down a body moving with high speed, such as during reentry of a space craft, is the extreme heat generated. Sink and ablation cooling are commonly used but the cost of such heat protection systems is very high. Thus heat dissipation has been an area...

Experiments have indicated that when brittle materials are under indentation, various forms of cracks including median crack, ring crack, Hertzian crack and side (lateral) crack nucleate leading to the fragmentation. The lateral cracking under indentation can be attributed to unloading and plays a crucial...

Micro-milling is emerging as a promising fabrication process to serve the increasing needs in making miniature parts with complex three-dimensional 3D features. The prediction model of cutting force is important in a correct choice of cutting parameters, reasonable design of micro tools and accurate...

In order to achieve rapid injection of micro-nano satellites, based on the analysis of latest related research result, a conception that truss structure is applied to the modular structure design of micro-nano satellite is presented, and a detailed approach using ball joint and rod as load-carrying structure...

The basic mechanical properties of the perlite air-entrained concrete (PAC) material were measured using DIC method in this paper, and the deformation behavior and failure mechanism of the material was also researched. The experiment results show that using DIC method could not only exactly measure the...

The thermal stress was generated in sputtered TiB2 films during the films cooled down due to the mismatch of thermal expansion coefficient. As a considerable distinction in the physical and thermal properties of films-substrate system was existed, the thermal stress was still important despite of sputtering...

Formation and propagation of crack in quenching+tempering(QT) and quenching+ intercritical quenching+ tempering (QLT) treated Fe-9%Ni-C alloys were investigated by means of in-situ scanning electron microscope (SEM) and transmission electron microscopy (TEM).The sample treated by QLT showed better cryogenic...

The experimental platform designed in this paper can simulate process of the ATL machine, including variable rates and forces the composite prepreg tape laid up. Thanks to the closed loops, the platform is able to ensure the accuracy of the rate and force. As the control unit of the apparatus, PLC has...

A new terbium ( ) complex of the Schiff base (HL) derived from1-phenyl-3-furyl-4-benzoyl-4, 5-dihydropyrazol-5- one (PFBP) and 2-aminobenzimidazole (2-AB) has been synthesized and investigated by photolum-inescence spectroscopy. The molecular structure was characterized by IR spectra, UV spectra and...

The composite material of Carbon Fiber and steel plate is a new strengthening material. CFRB and steel plate can be seen as a kind of composite material, the force performance changes with the result of the content. The minimum content of CFRB in different CFRB and different steel plate rehabilitation...

Light-guide plate (LGP) is a key component of back-light modules in liquid crystal displays; warpage is one of the factors that affect the quality of LGP. Orthogonal simulation and experiment are used in this paper to study the effect of the injection compression molding (ICM) parameters, such as the...

In order to effectively use the waste oil-tea camellia seed shell and reduce environmental pollution, this paper presented a tea saponin extraction method by using tap water as the extraction agent and precipitation method from oil-tea camellia seed shell.The best extraction conditions and parameterize...

Based on the photo-elastic method, four groups of different ratio light elastic-plastic material were prepared by changing the epoxy resin, the firming agent, the plasticizer mass ratio; and the light elastic-plasticity material stress-strain curve and its elastic modulus E and Poisson's ratio were obtained...

Two parts of TRIP590 steel were formed by single point incremental forming (SPIF), which wall thicknesses are theoretically incrassate and reduced respectively. The wall thicknesses of the parts along the depth were measured. The experimental results show that SPIF can be employed to process TRIP steel...

Combustion and emissions characteristics were investigated on a common rail turbocharged diesel engine operating in the composite combustion mode of Homogeneous charge of DME and diesel fuel injection. The results indicate that under a certain amount of premixing of DME with intake air, the maximum of...

By using a homemade Iron Oxide Coated Sands filtration medium (for short: IOCS), start-up behaviors of compound biofilm formation on the surface of IOCS were investigated with the help of a series of experiments, and its removal efficiencies to Ammonia-Nitrogen contained in micropollution raw water were...

The process to manufacture microfluidic chip using quartz glass or Pyrex 7740 glass is expensive and complex. In order to overcome these, save production costs, simplify the process, and shorten the production cycle, soda-lime glass was designed as substrate carrier; positive photoresist AZ 4620 was...

In the present work, the behavior of un-coagulable CO was experimentally investigated during the condensation process of carbothermic reduction of magnesia at condensing zone temperatures ranging from 923 K to 1223 K. Magnesium powders and magnesium lump condensates were produced under different conditions...

This paper presents the concept of multi-layered porous media salt gradient solar pond (MP-SGSP). The thermal behavior has been analyzed and compared with the single-layer porous media solar pond. The experiments show that: the heat storage layer (LCZ) temperature rising rate of MP-SGSP with slag plus...

The numerical simulation of the heavy automobile front axles precision roll forging-die forging forming process was carried out by the DEFORM-3D. The temperature field, stress field, strain field, velocity field and metal flow condition in the forming process have been analyzed. The simulation results...

This article has designed a new sample pool for online measures the optical properties of oil compounds which contains in water impurity. The sample pool adopt unique circulation type of sampling technology to makes the continuous on-line detection, the sample pool design including light source, optical...

The effects of heat treatment on microstructures and mechanical properties of MgZnZr alloy have been investigated through the preparation of alloy, analysis of microstructure and test of mechanical properties. The results show that, the microstructures and mechanical properties of Mg-5.5%Zn- 0.5%Zr alloy...

In light of the application research of aluminum alloy rheological forming,it introduces the application of Rheoforming with several aluminum alloys based on Rheoforming applied research of Key Lab of Near Net Forming in Jiangxi Province in recent years, there are mainly LAO and LSPSF semi-solid slurry...

A convex polyhedron collision detection algorithm based on the shortest distance is proposed, which uses convex Bounding Volume Hierarchies to express convex polyhedron. Thus the distance problem of two convex polyhedrons is come down to a non-linear programming problem with constraints. The non-linear...

The moisture of green sand mainly refers to the water that can be got rid of at the temperature of 105 -110 , and it is affecting sand quality, one of the most important and sensitive parameters that affect the quality of green sand. At present, the methods for measuring the moisture content can be divided...

A large amount of radioactive substances have been discharged into the sea during the Fukushima nuclear accident, which did tremendous harm to the marine ecological environment. The progress in study of relocation diffusion and transformation of radionuclide in water from coastal nuclear power plant...

Fiber placement is an important processing technology for fabricating complex composite structures which offer many advantages over traditional structural material. In this paper, a novel path planning algorithm for closed surface is proposed, which take midline and edge of tows as placement curves alternatively...

The microstructure and mechanical properties of AZ61- 1Sm magnesium alloy with Sb addition were analyzed by X-ray diffraction (XRD), light optical microscopy (OM), and scanning electron microscopy(SEM). The results demonstrate that addition of 0.5wt.%Sb to the AZ61-1Sm alloy obtains the highest ultimate...

Aero-engine alloys (also as known as superalloys)are known as difficult-to-machine materials, especially at higher cutting speeds, due to their several inherent properties such as low thermal conductivity and their high reactivity with cutting tool materials. In this paper a finite element analysis (FEA)...

The capacitance method is one of the commonly-used methods for measuring the moisture content of green sand. However, due to the influence of the plate structure, the contact resistance and the parasitic capacitance and so on, there is a big non-linear problem. On the basis of briefly introducing the...

Conductive ink formulation is designed by changing the proportion between resin and conductive filler. Making rectangular sample which have different formulation and lengthwidth ratio through silk screen printing .Then testing and analyzing sample surface resistivity, sample surface temperature and sample...

A novel ionic polymer based on crosslinked poly(vinyl alcohol) - succinic acid -5-Sulfoisophthalic acid sodium salt (PVASS) was prepared using solution casting method and the electromechanical performance was studied for the first time. The PVASS membranes were characterized using Fourier transform infrared(FT-IR)...

Under considering the interaction of the factors, the effects of the clay content, moisture content and coal content on the compactibility, permeability, green compressive strength and shatter index of green sand for high density moulding have been studied according to the orthogonal experimental method....

Anatase N, F and Sm codoped TiO2 sol (N-F-Sm-TiO2) catalysts were prepared by a modified sol-gel hydrothermal method, using tetra butyl titanate as precursor. The morphology, particle size and the present forms of F, N and Sm atoms of as-prepared N-F-Sm-TiO2 sol were characterized by XRD TEM UV-Vis-DRS...

Tool wear/tool life of PVD cemented coated carbide material in machining superalloy In718 has been studied by different methods. Self-organization theory is one of the effective ways to explain tool wear/tool life. In this paper, worn and fractured surfaces of the cutting tools were characterized by...

After deeply analyzing the relation between reason and symptom of rotor fault, the sample entropy was introduced into the fault diagnosis field of rotating machinery. Combined with rank-order morphological filtering and sample entropy, a novel feature extraction method was proposed for rotor. Firstly,...

Analytical equations are presented herein to predict the penetration of semi-infinite metallic targets struck normally by long rods at high velocities. The analysis is based on energy balance where the kinetic energy loss of a long rod is related to the energy dissipated by the plastic deformations in...

The special processing method of paraffin was introduced, which was processed by a special cutting tool——Hot-Knife. This paper adopted this method for processing paraffin, proposed the implementation requirements for conditions of paraffin, structure of the cutting tool and working principle of the machine,...

Ammonium aluminum carbonate hydroxide (AACH) can be obtained from different anions of aluminum sources by a solid-state reaction. Anions play a crucial role on the properties of AACH. It is observed that best-crystallized AACH can be obtained from Al2(SO4)3. Depending on the nature of anion present during...

The low cycle fatigue fracture properties are studied based on notch and smooth specimens fatigue tests in this work. The relationship between strain and life and that between stress and energy are observated under different load conditions. The -N curve in double logarithmic coordinates for different...

Mesostructured -Al2O3 has been successfully synthesized via an ionic liquid-assisted solvent evaporation process. The results show that ionic liquid [Omim]+Cl- plays an important role in the formation of the mesostructure due to its strong interactions with reaction particles.The synthesized porous -Al2O3...

Considering the characteristics of fire in the cabin of Civil Aviation, a new method is introduced to do the fire simulation by using computer simulation. Some basic theories, computational models and practical problems are given about the fire dynamics simulation software FDS and evacuation software...

Base on the study and analysis of existing ordinary nozzle and their atomization mechanism, the water mist fire extinguishing nozzle is developed and experimentally studied with Laser Doppler Velocimetry (LDV) and Phase Doppler Particle Analyzer (PDPA). The characteristics of flow coefficient K, atomizing...

Attapulgite (ATP) reinforced poly(butylene succinateco- butylene adipate) (PBSA) nanocomposites were prepared by melt mixing in a HAAKE mixer. The fracture surfaces of PBSA/ATP nanocomposites showed superior interfacial linkage between ATP and PBSA matrix. The dynamic rheology properties of PBSA and...

The input and output torque of different shafts are important parameters in the design of vertical mixer’s transmission agent. However, the calculation of the torque is so difficult because of the complex structure. In order to solve this problem, a relationship between input and output torque, number...

Here a simple method for fabrication of the microfluidic device with micro- and nanochannels was developed. The microchannels in micro and nano scales were fabricated on a glass substrate during a two- step process respectively. And then the glass substrate with the microchannels was bonded with another...

In the process of fire of rapid firing rate 30 mm guns, it was not only difficult to guarantee firing accuracy and mobility but also had high requirements on the carriage strength because of large recoil force, therefore this design provided a scheme about hydraulic spring buffer mechanism to reduce...

This report details the thermodynamic analysis on zinc reduction of silicon tetrachloride. The diagrams of rGm -T and Kp -T for the Zinc production reaction were plotted. The reasonable temperature range was obtained by the thermodynamic analysis. The theoretical basis of improvements of the equipment...

It is a difficult problem to reduce the low-frequency vibration and radiation noise of underwater structure by decoupling coating. Assuming decoupling coating as viscoelastic fluid, a vibroacoustic model of a simply supported rectangular plate covered by decoupling coating is presented. The model simulates...

NH4Al(OH)2CO3 precursors were prepared using Al(NO3)3 and NH4HCO3 as raw materials. The structural, morphological, and porous properties of the materials were investigated by BET, X-ray Diffraction (XRD), and Scanning Electron Microscope (SEM).The morphology and aspect ratios of resulting AACH nanoparticles...

Contact angle hysteresis has an important impact on liquid bridges between sphere particles. The paper studies the dynamic contact angles effect on capillary and viscous forces of liquid bridges, calculation results indicate that its effects on capillary force are significant; however, it has little...

The location of point excitation force is an important factor to influence sound radiation of underwater structure. A vibroacoustic model of a simply supported rectangular plate covered by decoupling coating is presented. The influences of the locations and the number of point excitation force to sound...

Magnesium alloys as the emerging commercial metal structure material have excellent specific properties and stability, which is more and more important for researcher. The magnesium alloy of Mg-Al series, Mg-Zn series, Mg-RE series included Mg-Y series alloy, Mg-Gd-Y series alloy, Mg-RE-Zr series alloy,...

In this study, three turbulence models k-
, standard k-  and SST Gamma Theta which all available in ANSYS CFX were used. Gamma Theta Model is the recommended transition model for general-purpose applications. The full transition model is based on two transport equations, one for the intermittency and...

Nowadays, with the greenhouse problem has been plaguing the world, the carbon footprint is also becoming an increasingly serious problem for manufacturing industry. To enable manufactures and operators of machining to take carbon footprint into their considerations in an objective way, this paper established...

Thermodynamic calculation for main reactions happening in the process of fabricating hydroxyapatite(HA) composite coating by laser cladding using the mixture of the calcium carbonate (CaCO3) and calcium hydrogen phosphate dihydrate (CaHPO4•2H2O) is carried out to obtain a high content of HA in coating....