bluuebunny/crossref_metadata_2025_split huggingface dataset:
Progressive damage analysis and failure load of ceramic matrix composite hollow-shaft
Authors: Zhang Chengcheng 
Published: November 2020

Abstract
Composite damage is one of important reasons for the destruction of engineering structures; therefore the research target is a typical engineering component – hollow shaft. Firstly, based on the continuum damage mechanics, a stiffness degradation method is proposed to simulate the progressive damage process of ceramic matrix composite hollow-shaft. Afterwards, program development using solid finite element method in ANSYS, the simulative load–displacement curves and tensile failure load of the hollow-shaft are achieved. Finally, Qualitative and quantitative analysis by computer calculation and experimental results, successfully predict the structure failure modes and bearing capacity under axial load. This work proves that the correctness and feasibility of this progressive damage analysis method for ceramic matrix composite hollow-shaft, and further deepen the understanding of damage development.
Main Components and Neuroanalysis of Automatic Steel Water Deoxygenation Alloy Ingredients
Authors: Zhang Maoyi 
Published: November 2020

Abstract
At present, how to establish a mathematical model of deoxygenation alloying link through historical data, predict and optimize the type and quantity of alloy input online, and minimize the production cost of alloy steel while ensuring the quality of steel and water. It is an important issue for major steel companies to improve their competitiveness. Based on the main component and neural network and multivariate nonlinear regression theory, based on the existing alloy historical data, this paper optimizes the ingredients scheme of "deoxygenation and alloying" of steel and water, establishes the mathematical model, calculates the historical harvest rate of the main elements, and predicts the historical harvest rate of the main elements. Combined with the price of the alloy, the automatic ingredient scheme of the steel water deoxygenated alloy is given, and the cost of the steel water deoxygenated alloy is optimized.
Comparison on Mechanical Property of PLA/PBAT Film under Simulate Weathering Tests
Authors: Guo Cheng HAN , Rui GUO , Zhao Hui YU 
Published: November 2020

Abstract
The mechanical property changes of PLA/PBAT packaging films under different weathering tests were conducted. After manufactured by plant-size equipment, the tensile strength, elongation rate and tearing strength of printed/non-printed fully-biodegradable packaging films were evaluated after eight-days testing under different weathering conditions including xenon-lamp aging, salt spraying, cooling and freezing, simulating the use of commercial fully-degradable bags in outdoor environment, ocean or coast environment, and in the ice chest of supermarkets. The results demonstrate that printing process led to a decrease of mechanical properties of the fully-biodegradable films. Moreover, the weathering tests had remarkable negative impact on the toughness of fully-biodegradable films, and had large impact on the tearing resistance of the films, while the strength of films were less influenced. Additionally, the low-temperature conditions show less influence on the mechanical properties of fully-biodegradable films, and the high salinity and high humidity environment exhibits tremendous impact on the fully-biodegradable films. The proposed research demonstrates the capability of commercial fully-biodegradable films for different application scenarios, as well as the referrible disposal treatment for fully-biodegradable films.
General Eigensolutions for 2D Viscoelastic Materials
Authors: Yan GF , Zhang WX 
Published: November 2020

Abstract
In recent years, viscoelastic materials have been widely used in industry, and the study of its mechanical properties has become the key of modern science and engineering. In this paper, based on Laplace integral transformation, a new analytical method is proposed to solve the mechanical problems related to viscoelastic materials. According to the variational principle and the method of separating variables, the governing equations of the basic problems are established, and all the eigensolutions of analytical forms are obtained. In the numerical calculation, the relationship between these eigensolutions and boundary conditions is studied systematically, and the time-dependent property of viscoelastic materials is well described.
Stability analysis and risk assessment of a landslide in southwest of China
Authors: Lv Qingchao , Zhou Heng , Di Shengjie 
Published: November 2020

Abstract
In this paper, a risk assessment method based on limit equilibrium method is proposed. It has been used to estimate the risk of forming wedge body in a landslide in southwest of China. According to the monitoring data and the result of stability analysis using limit equilibrium method and three-dimensional finite element method, we find that due to the rising of water table, the landslide tends to limit-equilibrium state. The displacement under normal condition is consistency with that of monitoring. It is possible to slide under dynamic condition, but the landslide cannot block the river totally. The research achievements have been used to make contingency planning and are of great significance.
Preparation and Flame Retardancy of Hydrotalcite/Montmorillonite Nanocomposite
Authors: Wang Han , Huang Wuji , Yang Lang 
Published: November 2020

Abstract
Layered nanocomposite hydrotalcite/montmorillonite (LDH/MMT) was obtained though in-situ synthesis of nickel-magnesium-aluminum hydrotalcite (Ni-Mg-Al LDH) on the surface of montmorillonite nanosheets (MMTNS) by one-step hydrothermal method. X-ray diffractometer (XRD), Fourier Transform Infrared Spectrometer (FTIR), Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM) were used to characterize the composite material. The flame retardancy property of the composite was investigated by thermogravimetry (TG) and cone calorimeter (Cone). The results show that both the hydrotalcite and montmorillonite nanosheets have a lamellar structure; LDH/MMT composite has better thermal stability than that of hydrotalcite or montmorillonite alone, and the flame retardant effect of LDH/MMT on polystyrene (PS) is more obvious. The composite material can reduce the maximum heat release rate of polystyrene during combustion by 14.8%.
Catalytic Oxidation of Toluene over Manganese and Cerium Complex Oxide Supported on Zeolite
Authors: Wang Keliang , Liu Xiuzhen , Tu Shunheng , Zhang Le , Jiang Chan , Li Wen , Ye Daiqi 
Published: November 2020

Abstract
The air pollution caused by VOCs emssions has drawn considerable attention in recent years. Many catalyst systems with excellent activity were studied for the catalytic oxidation of VOCs. In this work, using air containing toluene as the simulation of industrial emissions, MnOx-CeO2/Powder zeolite and MnOx-CeO2/Honeycomb zeolite catalyst samples prepared by the isometric impregnation method were studied for catalytic performance of toluene. The catalysts were characterized by SEM, BET, XRD, SEM, H2-TPR and O2-TPD. The research results obtained showed that MnOx-CeO2/Powder zeolite catalysts exhibited better activity than MnOx-CeO2/Honeycomb zeolite catalyst at lower temperatures, the MnOx-CeO2/Powder zeolite catalyst presented better catalytic performance with T50=223°Cand T99=275°Cunder the condition of GHSV of 15000h−1 and toluene concentration of 100ppm, which is 23°Cand 47°Clower than MnOx-CeO2/Honeycomb zeolite, respectively. The characterization results also indicated that the catalytic activity was relavant closely with specific surface area, active oxygen species, catalyst morphology and valence of manganese and cerium oxides. Also, the catalyst has an excellent stability in the catalytic combustion towards toluene.
Study on seismic performance of frame structure with viscous damping staircase
Authors: Changren Ke , Hanqin Wang 
Published: November 2020

Abstract
Based on the significant energy dissipation performance of the viscous damper, the force-displacement hysteresis curve is full and the Maxwell mechanical model has a weak dependence on vibration frequency. Combining the failure mode of the staircase damage with the Maxwell mechanical model, this paper proposes an earthquake-resistant frame staircase model with damped bearings. A finite element analysis of a nine-story reinforced concrete structure is performed using SAP2000. By setting three different connection methods on the staircase structure, the similarities and differences of different staircase structures to the input seismic wave feedback are analyzed to compare the advantages and disadvantages of its seismic performance.
Effect of Thermodynamic Factors on Colloid Stability
Authors: Chen Zhengxian 
Published: November 2020

Abstract
Colloid is more and more widely used in daily life. No matter medical application, or food additive in the food industry, or electrolyte in the lead battery, all are deeply connected with it. Among them, the stability of colloid is an important direction for people to explore. According to DLVO theory, the stability of colloid is determined by the height of energy barrier. In this paper, the effect of temperature on colloid aggregation or sedimentation will be discussed by calculating and observing the settling process of colloid. This paper will also put forward the optimum temperature position to keep the highest energy barrier height and the way to estimate the value of energy barrier by reaction, which gives new possibilities for controlling colloid stability.
Research on Application of RPC Materials in Urban Pedestrian Bridge Reconstruction
Authors: Lyu Ping , Long Peiheng 
Published: November 2020

Abstract
Aiming at the characteristics of poor corrosion resistance, high maintenance frequency and high cost of steel box girder pedestrian bridge structure, and the traditional concrete is thick and moderate in strength, this paper proposes a method to apply reactive powder concrete RPC to the existing pedestrian bridge deck and uses steel-RPC composite box girder as the bridge superstructure. Based on the research on the RPC material and the related performance of its components, the feasibility and reliability of RPC applied to beam-slab composite members are verified. By comparing steel-RPC composite box girder, steel box girder, and steel-general concrete composite box girder, it is found that steel-RPC composite box girder is superior in terms of mechanical performance, economic evaluation, and aesthetics. The research shows that the steel-RPC composite box girder is more suitable for the steel box girder pedestrian bridge reconstruction project and the new pedestrian bridge project across urban roads.
Design of rotor profile of a new roots vacuum pump
Authors: Liu Linlin , Chen Peijun , Du Jinqiao 
Published: November 2020

Abstract
This paper presents a new rotor profile of roots vacuum pump composed of arc, involute and cycloid.It’ s whole tooth profile which is described exactly by combining the meshing principle of gears with parameter equation. The performance of meshing of two rotors is improved without profile interference and packet gas, which are the problems of conventional involute profiles. The work provides new theoretical basis for digital design of new rotor profile, its meshing analysis, dynamic emulation, kinematics and dynamics analysis.
Coupling Analysis of Temperature Field and Stress Field of Laser Cladding Die Steel
Authors: Yao Shihang , Zhao Changlong , Liu Jun , Wang Xuxu , Lv Qiyin , Wang Kuo 
Published: November 2020

Abstract
A 3D parametric model was established for the die steel whose matrix material was H13. Ni60 alloy powder was used to cladding the matrix, and a single-layer multichannel finite element model of heat-force coupled laser was established. The laser power P=600W, scan rate v=20mm/s, laser spot radius R=1mm were selected as simulation parameters. The temperature field and stress field in the process of laser cladding are analyzed by finite element method.
Demand Forecast of Restoring Air Material of Helicopter Based on NHPP and Weibull Model
Authors: Niu Penghui , Wang Zhen , Liu Suyong , Jia Ke 
Published: November 2020

Abstract
The demand forecast of spare parts for helicopter air material is one of the key links in the supply and guarantee of helicopter air material. In order to forecast the demand of helicopter restoring air material effectively, a method based on NHPP (non-homogeneous Poisson process) and Weibull model is proposed in this paper. In this method, the reparability of air material is fully considered, and the repaired air materials are divided into two categories: basically repairable and completely repairable. Then, reliability assessment is carried out based on NHPP and Weibull model, and the demand of spare parts for air material is predicted on this basis. The effectiveness is proved by an example.
Effects of deep cryogenic treatment on the microstructure and friction performance of M35 high-speed steel
Authors: Liao Jingwen , Li Liejun , Peng Jihua , Gao Jixiang 
Published: November 2020

Abstract
The tempered M35 samples were deep-cryogenically treated (DCT) at temperature - 240°C for a long time. The microstructure and hardness were characterized by SEM, and Rockwell together with Vicker’s indenter respectively. The wear resistance was tested by a ball-on-disc friction and wear testing against Si3N4 balls. Comparing to high-speed steel without further treatment, the size of grains was reduced to 9.94 μm and promoted the formation of carbides after DCT. However, it was found that the hardness of the samples before and after DCT kept almost the same. Under high load, the wear resistance was slightly improved. This was probably responsible for carbides precipitation and Co precipitated from the α-Fe matrix during DCT.
Effect of sintering temperature and solution treatment on microstructure and mechanical properties of high-N Ni-free austenitic stainless steel prepared by metal injection molding
Authors: Huang Chengcheng , Li Liejun , Ngai Tungwai , Zhang Weipeng , Ngai Sieglind 
Published: November 2020

Abstract
High-N austenitic stainless steel was prepared by injection molding and sintering under nitrogen atmosphere by using gas atomized Cr-Mn-Mo-N duplex stainless steel powders. The powders and binder were mixed, injected, debinded and sintered. Effect of sintering temperature and solution treatment on microstructure and mechanical properties were studied. It shows that sintering temperature has significant effect on N content and density. With the increase of sintering temperature, the sample density was increased, but the N content was decreased. Samples sintered at 1200 °C was composed of austenite and Cr2N, while only austenite can be detected by XRD for samples sintered at 1250 and 1300 °C. The fracture mode of the samples sintered at 1200 and 1250 °C is brittle fracture, along the 45° direction and stress axis, but samples sintered at 1300 °C did not fractured at the maximum load (21 kN) and showed ductility during compression. After solution treatment, the Cr2N was disappeared and samples sintered at 1250 °C did not fractured during compression.
Ultra-fast luminescence of nano-gold film structure
Authors: Shen Fang , Zhou Guyu 
Published: November 2020

Abstract
The Fermi level of gold is not in the band gap, but in the sp band. Therefore, macroscopic gold is usually a non-luminescent material. Unlike gold bulk materials, frequency down-conversion photoluminescence and enhanced photoluminescence from gold nanoparticles have been studied, and the intensity of their photoluminescence is affected by the size, shape and plasmon resonance of the gold nanoparticles. In particular, plasmon resonance helps to increase the photoluminescence intensity by several times than the intensity in the macroscopic gold structure. Gold nanoparticles can also produce photoluminescence including second harmonic and third harmonic under intense photo excitation. Here, in order to study the luminescence properties of gold nanostructures under femtosecond laser, we applied a 5 nm gold film on a Si3N4 substrate by magnetron sputtering. The nano-gold film was excited using a femtosecond laser with an incident peak power density of 2.3 × 109 W/cm2 and 4.5 × 109 W/cm2. We explained that by studying the excitation spectra of nano-gold structures, we can see that SHG occurs at high power density and frequency shift occurs.
Structural Design and Impact Simulation of Glass Fiber Fragile Cover of Rocket
Authors: Huifang Wang , Chenying Zhou , Changfang Zhao , Jie Ren , Jianlin Zhong 
Published: November 2020

Abstract
The fragile cover of rocket not only has the characteristics of sealing and high-temperature resistance, but also can break according to preset scratches when hited by the rocket’s head. In this paper, a penetrating glass fiber fragile cover with scratches is designed, and six structural types are set up with the number of layers laid by glass fiber as independent variables. Based on Hashin failure criterion and damage evolution law, the finite element method is used to simulate the process of rocket breaking through fragile cover and gas flow impinging fragile cover. The results show that the fragile cover will break along the preset scratches, which does not produce debris to interfere with rocket launch. As the number of glass fiber cloth layers increases, the Mises stress of the rocket’s head increased when the fragile cover broken. The impact of the gas flow on the fragile cover of the adjacent pipe is not uniformly distributed, and the maximum value of the Mises stress appears at the scratches of the cover body. As the number of glass layers decreases, the failure index value of the fragile cover under the impact of gas flow increases. The research provides a reference for the design of rocket glass fiber fragile cover.
Experimental study on dynamic mechanical properties of TiB-whisker-reinforced Ti-6Al-4V Alloy
Authors: Hao WANG , Zhaohui ZHANG , Qi SONG , Shipan YIN , Zhengyang HU , Xianyu Li 
Published: November 2020

Abstract
In this study, the titanium matrix composites (TMCs) reinforced by TiB whiskers (TiBw) were fabricated by spark plasma sintering (SPS) technique. The dynamic compression test was carried out to study the effect of TiBw content on dynamic mechanical properties of TiBw/TMCs. Results showed that the TiBw content (0.76vol%~6.84vol%) correspond to specific microstructure which affect the dynamic mechanical properties of the composites. Under high strain-rate (3100s−1), the 4.56 vol.% TiBw/TMCs showed the highest flow stress (~1968MPa) and strain (~15%). The absorbed energy increased first and then decreased with increase of TiB2 content, and the highest absorbed energy of 275.8 MJ.m−3 was achieve by TMC2. Besides, the analysis of fracture appearance indicated that TiBw dominates the failure of the TMCs, fractography of composites varies by the TiBw content of TMCs.
Properties of Friction Stir Welded 3003-H17 Aluminum Alloy at High Travel Speeds
Authors: Xu Anlian 
Published: November 2020

AbstractAs a new-type technology of solid state welding, friction stir welding (FSW) has a very good prospect for application. However, the welding speed is low in the practical application, and most of the time the welding speed is less than 500 mm/min, which hinders the large-scale commercial application of FSW. In this paper, 3003-H17 aluminum alloy plates of 5 mm thickness were butt welded by high speed FSW with travel speed at 1500 and 3000 mm/min and a constant tool rotation speed. The results show that 3003-H17 aluminum alloy can be successfully butt welded by high travel speed. And the UTS of weld joint decreases when the travel speed increases from 1500 mm/min to 3000 mm/min at a constant tool rotation speed of 2000 rpm and shoulder plunge depth of 0.2 mm. The joint efficiency reaches 87% at travel speed of 1500 mm/min, tool rotation speed of 2000 rpm and shoulder plunge depth of 0.2 mm.
Design method of compression-bending arches with web openings considering local buckling of web
Authors: Xi Kuantang , Zhang Yi 
Published: November 2020

Abstract
This paper studies the in-plane stability design method of two-hinged steel arches with web openings I-shaped cross sections when local web buckling is allowed. The paper compares two types of failure mechanisms, namely, global buckling and local buckling. Based on the analogy of calculation formula of beam bending, the author proposes a formula for calculating the bearing capacity when web buckling is taken into consideration.
An Eigen Expansion Method for Elastic Boundary Conditions
Authors: Zhang WX , Yang LM 
Published: November 2020

Abstract
With the aid of symplectic system, the mechanical problems related to elastic plates are studied. Using this method, displacement and stress components are taken as basic variables, so it is no longer necessary to make assumptions like the semi inverse method, and thus a set of concrete methods for dealing with non-homogeneous equations and boundary conditions are given. The mechanical response of elastic plates under external forces is discussed.
Research on the Characteristics of Greases of Nano - Modified MoS2 Additive on the Basis of CTAB
Authors: Sheng feng XIONG , Xiu xiang CHU 
Published: November 2020

Abstract
The effects of nano-MoS2 as additive and CTAB modified MOS2 as additive on the properties and mechanism of Lithium Grease were investigated. The maximum bite-free load (PB), sintering load (PD), cone penetration, Shear Stability, drop point and Steel Mesh separation of grease were tested according to the performance test standard of Grease Quality Index. The effects of nano-MoS2 and CTAB on the physical and chemical properties of lithium-based Grease were studied by comparing the physical and chemical data of three samples: lithium-based Grease without additives, lithium-based grease with nano-MoS2 and lithium-based grease with CTAB. The surface structure of nano-MoS2 modified by CTAB was analyzed by Scanning electron microscope method. The results showed that CTAB was uniformly adhered to the surface of nano-MoS2, and the surface energy of nano-MoS2 was decreased, it helps to disperse the grease more evenly and stably. The results show that CTAB can modify the surface of MOS2 and reduce the surface energy of MOS2, and the surface energy of MOS2 can be decreased by using Fourier infrared scanner. Combining the physical and chemical properties of the Lithium Grease with the SEM and Fourier infrared scanning data, the nano-MoS2 modified by CTAB as additive can improve the performance of lubricating grease better than nano-MoS2 without surface modification, and disperse in lubricating grease more evenly and stably, thus, the colloidal structure of the lubricating grease is more stable.
Experimental Study on the Influence of Preheated Air and Air-fuel Ratio on the Combustion Temperature of Natural Gas Cupola
Authors: Li Guangpeng , Zhou Hengchao , Wang Qi 
Published: November 2020

Abstract
In order to improve the combustion temperature, this paper took 2t/h natural gas cupola as an example, designed the performance experimental systems, discussed and analyzed the influence of critical factors such as air-fuel ratio and preheated air temperature on the combustion temperature in the furnace. The results showed that the combustion temperature can reach the highest value by controlling the air-fuel ratio around 9. 8. The increase or decrease of air-fuel ratio can reduce the temperature, increasing the amount of air decreased the amount of smoke and taking away a lot of the heat, and decreasing the amount of air resulted in incomplete combustion. The combustion temperature can be increased by increasing the temperature of preheated air. The temperature rise rate is about 35°C for every 100°C increase below 200°C, and 55°C for every 100°C increase after 200°C.