bluuebunny/crossref_metadata_2025_split huggingface dataset:
Research on The ECM of Inner Copper Alloy of Bimetal Composite Part Based on Flow Field Simulation
Authors: Chen Yuanlong , Xu Peng , Cheng Zhuangzhuang , Lin Hua 
Published: June 2021

Abstract
The high efficiency electrochemical machining (ECM) of inner copper alloy in bimetal composite part composed of copper and tungsten was taken as the research object. The cathodes with positive flow, reverse flow and side flow electrolyte flow were designed. The flow field simulation geometric model was established, and the flow field simulation and flow field uniformity analysis were carried out by COMSOL Multiphysics, the general structure of tool cathode was designed based on side flow type. The results show that the uniformity of the flow field in the side flow machining area is better, and the stability of the machining process can be improved by using the structure design of the front and rear positioning plates.
Production line optimization based on Man-Machine collaborative improvement
Authors: Fan Wei , Yang Lei , Chen Xin , Jing Lizhen 
Published: June 2021

Abstract
In many cases industrial companies’ efficiency is limited by bad man-machine collaboration. In the time of intelligent manufacturing, more data can be collected and help companies to improve their efficiency. Therefore, a production line optimization method based on Man-Machine collaboration with the help of big data tools and sensors is introduced. At first, the production line will be analyzed and main data as machine cycle time, personnel operation time, task distribution etc. will be collected. Then based on these data, a simulation model will be made in plant simulation. After that, the performance of the production line will be evaluated considering the man-machine collaboration, work task distribution etc. and the optimization will be made. Afterwords, the machine cycle time, operator motion track and labor operation time in real production situation will be collected to compare and validate the optimization model.
Extraction of Droplets for Bioanalysis Based on Superhydrophobic Hole
Authors: Liu Rui , Chen Yang , Pan Weihao , Song Jinlong 
Published: June 2021

Abstract
Superhydrophobic surfaces, which have the excellent characteristics of self-cleaning, low-adhesion and non-wetting, have been widely used in the field of biochemical analysis by limiting sample loss. In this paper, a method to generate droplets of appropriate volume by superhydrophobic holes was proposed. First, the super-hydrophobic surface with super-hydrophobic holes was fabricated by laser etching and low surface energy modification. Then, the possible states of droplets were analyzed. In addition, the effect of droplets size and hole size on the states of droplets were studied comprehensively. This method of droplets generation based on superhydrophobic holes has great potential applications in step-by-step biological experiments.
Stability Analysis of Half-rotating Walking Mechanism with Self-balancing Configuration
Authors: Wang Yongming , Zhang Guoli , Xu Xuetan 
Published: June 2021

Abstract
Aiming at the problem of dynamic stability of half-rotating walking mechanism, a walking mechanism with self-balancing configuration is proposed. Using D-H method, the transformation matrix between coordinate systems is obtained. Based on the structural and kinematic characteristics of the half-rotating walking mechanism, a new evaluation method for the kinematic stability of the half-rotating walking mechanism is proposed: the stable triangle method. A stable walking strategy of half-rotating walking mechanism is proposed to keep the minimum stable angle as the maximum in the process of motion. Adams motion simulation shows the strategy adopted is reasonable and effective. The stability analysis based on the minimum stability angle shows that the half-rotating walking mechanism can walk stably, and the faster the speed of the half-rotating mechanism is, the weaker the stability of the mechanism is.
Study on the Applicability of Phase Change Energy Storage Materials in Asphalt Pavement
Authors: Lu Yong , Liu Linlin , Wu Chunying , Liu Aihua , Li Yali , Guo Ruyong 
Published: June 2021

Abstract
In order to optimize the phase-change energy storage materials for asphalt pavement and analyze the feasibility and applicability of phase-change energy storage materials for asphalt pavement, the experimental methods of thermogravimetric analysis (TG) and Fourier infrared spectroscopy (FT-IR) were adopted. The thermal stability, chemical stability and chemical compatibility of various phase change energy storage materials were tested and analyzed. The results show that the fatty acids, stearic acids and fatty alcohols showed significant weight loss at 200°C. PEG and DTC phase change materials showed no mass loss at 200°C and had good thermal stability. PEG2000 and DTC have no chemical changes after high temperature treatment, and PEG2000, DTC and SBS modified asphalt are physical blend, and the chemical compatibility with asphalt is good. Crystalline hydrated salts, paraffin, fatty acid, stearic acid, fatty alcohol phase change materials are not suitable for asphalt pavement, PEG organic phase change materials and DTC composite phase change materials can be used for intelligent temperature control asphalt pavement research.
Synergistic regulation mechanism of bionic structure and poly (vinylsulfonic acid) sodium (PVSNa) coating for high load bearing lubrication
Authors: Liu Mengmeng , Liu Zhifeng , Zhang Caixia , Hou Kexin 
Published: June 2021

Abstract
A low friction coefficient and high bearing capacity can improve the service life of implants in the human body. In this study, the surface performance was improved by coupling the structure with the material. The bionic structure was obtained on the titanium alloy (Ti6Al4V) surface by chemical etching. The mechanical properties of Ti6Al4V with bionic structure were investigated by tribological experiments with different stresses. An interesting phenomenon was found that the friction coefficient of etched surface decreased with the increase of the stress, indicating that bionic structure can effectively improve the stability of Ti6Al4V surface bearing capacity. A poly (vinylsulfonic acid) sodium (PVSNa) coating was further fabricated on etched Ti6Al4V to obtain low friction. During the sliding process, PVSNA molecules were continuously added from the bionic structure to the surface through friction force for lubrication. The synergistic regulation of bionic structure and PVSNa coating made Ti6Al4V surface obtain low friction and high bearing capacity stability. This study can serve as a guide for the design of low friction and high bearing capacity stability.
Numerical Simulation on Jet Forming and Penetration Performance of Several Amorphous Energetic Alloy Liner with Typical Structures
Authors: Cui Ping , Shi Dongmei , Xu Jingqing , Wang Tianci , Zhang Xingze , Li Zhuang , Wang Deshi 
Published: June 2021

Abstract
The structure and material of the liner are the key factors that affect the forming and penetration ability of the jet. In order to study the influence of new energetic materials and typical liner shapes on jet forming and penetration behavior, this paper takes ZrCuNiAlAg amorphous alloy as the liner material and establishes four shaped charge (SC) models with conical, sub-hemispherical, eccentric sub-hemispherical and hypercumulative liners respectively. The jet forming law and its penetration process against the concrete target plates under different liner shapes are studied based on the AUTODYN numerical simulation software. The results show that a stable jet can be formed from ZrCuNiAlAg amorphous alloy liner under the Mohaupt effect, but the jets produced by liners with different structures differs quite a lot. Under the same conditions including charge diameter, charge length diameter ratio and wall thickness, the tip velocity, the tip-tail velocity difference and the length of the jet formed by conical and hypercumulative liners are significantly higher than those of sub-hemispherical and eccentric sub-hemispherical liners. The jet length of the hypercumulative liner is the longest while that of the eccentric sub-hemispherical liner is the shortest. The hypercumulative jet can penetrate a concrete target plate with 400mm thickness at 250μs, and the jets formed by conical, sub-hemispherical and eccentric sub-hemispherical liners basically stops the penetration ability at 300μs. In terms of penetration depth, the hypercumulative liner is the largest and the sub-hemispherical liner is the smallest. The sub-hemispherical liner gets the largest perforation aperture. The eccentric sub-hemispherical liner gets the best comprehensive effect of penetration and expansion against the concrete target. The results of this paper can be used for reference in the structural design of the amorphous alloy liner.
Process and performance of ultra-high-speed laser cladding corrosion-resistant layer on the surface of tungsten cathode
Authors: Zhang Mingyi , Gao Ping , Wang Hao , Jia Xiaobin 
Published: June 2021

Abstract
Ultra-high-speed laser cladding technology is used to clad the surface anti-corrosion layer of tungsten cathode for molten salt electrolysis. Using MSC. Marc finite element simulation software, optical microscope (OM), scanning electron microscope (SEM), energy spectrum (EDS), X-ray diffractometer (XRD) and microhardness tester and other analytical testing methods, respectively, the cladding process, the cladding layer microstructure morphology, phase composition, phase distribution and microhardness are simulated, and the structure is observed and analyzed. The simulation results show that the preheating process before cladding for the tungsten substrate can effectively avoid the cracking phenomenon caused by internal stress; the structure and performance observation results show that the cladding layer has a dense structure and no cracks, forming a good metallurgical bond with the substrate, the difference in the structure of the cladding layer affects the hardness of the cladding layer.
The preparation of PVDF-BTO composite film and the influence of polarization intensity on the piezoelectric properties of composite film
Authors: Li-zhu Wei , Chang-song Zhang , Chu Wang , Ru-peng Wang 
Published: June 2021

Abstract
In this study, the PVDF-BTO composite film was prepared by the casting method. Through FTIR, SEM and other phase structure and microstructure analysis of the composite film, it was found that the introduction of BTO can promote the growth of β-PVDF. The relative content of β-PVDF in PVDF-BTO composite film reached 62.7%, indicating that BTO acts as a nucleating agent in PVDF. PVDF-BTO composite piezoelectric film is obtained after high temperature stretching and field polarization. After testing the electrical properties of the composite piezoelectric film, it is found that the piezoelectric performance of the PVDF-BTO composite film is higher than that of the pure PVDF film. It shows that the blending of BTO and PVDF to prepare the film promotes the deflection of the electrical properties of the film to the inherent electrical properties of BTO. The influence of different polarization intensities on the piezoelectric properties of composite materials was studied. The results show that the optimal polarization intensity of the PVDF-BTO composite piezoelectric film is 30 KV/mm, and the highest piezoelectric constant d33 is 13 pC/N.
Research on the Influence of Different Oxide Particles on Properties of AgCdO Contact Material
Authors: Yangfang Chen , Xiaofang Yan , Xiaoping Bai , Mingjiang Zhang , Jie Li , Changlin Yang , Xiufang Zhang 
Published: June 2021

Abstract
AgCdO electric contact material is widely used in low voltage industries, such as contactors, electric relays, switches and miniature circuit breaker, therefore it is called “the universal material”. This material is mainly prepared by internal oxidization and it has good machining properties and ani-welding resistance. In this paper, AgCdO(12) electrical contact materials with different oxide particle sizes (0.8, 1.2, 1μm) will be prepared. Besides, the microstructure, mechanical properties and electrical properties of different AgCdO(12) materials will be investigated. It is expected to provide reference for research and design of electrical contact materials.
Microstructure and tensile property of a BCC-structured high entropy alloy fabricated by laser melting deposition
Authors: Yang Min , Sun Shi-Hai , Wang Benpeng , Liang Yaojian , Wang Lu , Xue Yunfei 
Published: June 2021

Abstract
The microstructure and tensile property of a BCC-structured high entropy alloy fabricated by laser melting deposition was investigated in this paper. The microstructure of as-deposited specimens was equiaxed grain and consisted of BCC phase and Zr rich precipitate. Due to the in-situ aging effect, the precipitate content in the as-deposited specimen increased with the increase of the distance from the last build plane, which can be weakened by decreasing the input power. With a heat treatment at 950°C for 1h, the precipitate can be completely removed. The strength and ductility of the heat treated specimen were much higher than those of the as-deposited specimen, which may be owing to the increased solution strengthening effect through the dissolution of the precipitates.
Study on the properties of electrospun fiber for wound healing
Authors: Bo Yuan , Xianyun He , Tao Zhang 
Published: June 2021

Abstract
Electrospinning is a kind of technology which can efficiently prepare wound healing materials. In the application process of materials, it is very important to study the biological and mechanical properties of fiber materials. In this paper, Polycaprolactone fiber was prepared by controlling the process parameters of electrospinning process. The surface structure of the fiber was observed by scanning electron microscope and atomic force microscope. The results of electron microscope showed that there were cross stripes on the fiber surface, which would affect the mechanical properties of the fiber. The mechanical properties of fiber under two kinds of deformation conditions were measured by using high precision drawing equipment and self-made bending device. The experimental data show that the elastic modulus of the fiber under tensile load presents discrete distribution characteristics, and the elastic modulus of the fiber has nothing to do with the diameter; while in the bending experiment, the elastic modulus of the fiber increases significantly with the decrease of the fiber diameter, and the mechanical properties of the fiber show scale effect related to the fiber diameter. The reason for the different mechanical properties of the two groups of fibers may be related to the crystal morphology of the fiber surface and interior.
Comparing Properties of the Warp-knitted spacer fabric instead of sponge for automobile seat fabric
Authors: Guo Yan , Chen Lin , Qiang Sheng , Qian Xian , Xue Tao , He Fang 
Published: June 2021

Abstract
The warp-knitted spacer fabric is a new material for automobile seat fabric that can replace sponge in recent years. But its properties of the strength and recovery are very important in laminated car seat fabric. In this paper, the breaking and tearing strength, stress-strain relation was tested and compared. It could be seen that the warp-knitted spacer fabric had excellent performances in strength of breaking and tearing, better air permeability than same thickness sponge. Therefore, it is a good material to replace sponge. Meanwhile, when its thickness was 6mm, the warp-knitted spacer fabric had better ability in the breaking strength, tearing strength, air permeability and the elastic recovery, so it could be used to instead of sponge in lamination car seat fabric for middle layer.
Research on the microwave absorbing properties of ferrite/acetylene carbon black composites with different structures
Authors: Xianyun He , Bo Yuan , Xinghua Zhang 
Published: June 2021

Abstract
This experimental study was aimed to investigate the microwave absorbing properties of composites with different structures prepared by filling nitrile rubber (NBR) with ferrite and acetylene carbon black (CB). The results show that the input impedance of the ferrite-filled composite was smaller than that of the CB-filled composites. The ferrite filled composite also matched the free space better than the CB filled composite. The two-layer and four-layer composites performed significantly better than the single-layer structure composites in absorbing microwaves. The maximum absorption attenuation of the four-layer NBR/CB composites reached 11.38dB.
Surface roughness of PLA parts by FDM with chemical treatment
Authors: Li Bin , Yang Jiawei , Gu Hai , Jiang Jie , Zhang Jie , Sun Jianhua 
Published: June 2021

Abstract
Chemical treatment can effectively reduce the surface roughness of fused deposition modeling (FDM) parts. An effort is made in this study to appraise the surface finish of poly lactic acid (PLA) parts by FDM with hot vapor smoothing treatment. The tests were designed as per the Taguchi L16 orthogonal array based factorial design of experimentation while varying process parameters such as time, temperature and solution concentration of hot vapor smoothing. The surface roughness of PLA parts after chemical treatment reduces in different degrees compared with FDM prototypes. The results of the statistical study indicate that the surface roughness is affected by treatment temperature. The optimum parameters that have been verified by performing the experiments may provide a theoretical basis for FDM parts in practical application.
Influence of stone powder content in machine-made sand on mortar concrete
Authors: Wen Hongping 
Published: June 2021

Abstract
The paper mainly studies that Influence of stone powder content in machine-made sand on mortar concrete. By changing the amount of stone powder in the machine-made sand, the ratio of cement to water and sand to grout, the change in the tensile value of the steel bar in concrete can be found. After a lot of test data to prove that the content of stone powder is 6%, the mortar ratio is 1: 2.5, the water-cement ratio is 0.40, the content of water-absorbent resin is 0.20, and the performance of the C40 concrete is good.
Research on Effect of Cryogenic Coolants on Machinability Characteristics in Machining Ti-6Al-4V
Authors: Yousuf Yusuf Abudllahi , Wang Zhenda , Fu Xiuli , Chen Liwen , Fang Jitao 
Published: June 2021

Abstract
In this research, Ti-6Al-4V was machined under dry cutting conditions and cryogenic cooling environment, on cutting tool and workpiece material, surface performance, and cutting force were studied. However, all cases observed a positive influence of cryogenic machining on selected aspects after turning Ti-6Al-4V. Turning process is carried out for five different cutting speeds (35, 40, 55, 70, 80 m/min) while 0.15 mm/rev cutting feed out and 0.5 mm cutting depth are to be constant. It was found that Cryogenic cooling can decrease cutting temperatures, increase tool life, improve the roughness of the cutting surface and the residual stress of the surface, improve the wear resistance and corrosion resistance of the cutting surface.
Microstructure and wear properties of high manganese steel by V-Ti alloying elements
Authors: Zhang Piao , Zhuang Weiwen , Wan Wenfeng , Peng Wei 
Published: June 2021

Abstract
High manganese steel was prepared by adjusting the components of the alloys by adding V-Ti. The investigation was carried out to study the effect of V-Ti elements alloying on the microstructure and wear properties of high manganese steel through metallographic microscope, scanning electron microscopy, mechanical machine and abrasive wear tests. The test results showed that V-Ti alloying improved the properties of high manganese steel. The grains are refined, size of impurities are reduced, the form and distribution of impurities are also ameliorated. In addition, the hardness was increased by 23.7%~84.6% and tensile strength can be increased up to 31.3%.
Preparation and characterization of flame retardant automobile fabric
Authors: Guo Yan , Chen Lin , Qiang Sheng , Qian Xian , Xue Tao , He Fang 
Published: June 2021

Abstract
The flame retardant polyester fiber used in seat cover of automobile is very important, because it has excellent function of safety when a car spontaneously ignites. In order to reduce material cost, several fabrics were designed and developed using flame retardant polyester fiber and ordinary polyester fiber interweave in this work. After test weaving and testing, the 8 fabric samples of the flame retardancy were all up to the national standard in flame-retardant function. The 1# fabric sample was 76.32% in ratio of flame-retardant polyester and the small jacquard stitching double weave, it was not only reached flame retardant best but also better decoration function. Meanwhile, flame retardant performance would be improved with coverage ratio of flame-retardant polyester on fabric surface. So, this conclusion can be useful to development of flame retardant fabric in automobile seat cover. The new product of development will be security, comfortable and beautiful and will adapt to needs of automobile industry.
Study on the dynamic fatigue performance of shot blasting machine’s blades based on modal analysis
Authors: Zhang Tianyi , Wang Shuai , Yousuf Yusuf Abdullahi , Jiang Zhenfeng , Fang Jitao , Fu Xiuli , Men Xiuhua 
Published: June 2021

Abstract
Shot blasting is an important means of metal surface treatment, and the fracture of rotating blade is the main reason for the abnormal operation of shot blasting machine. In order to prolong the service life of the equipment, the dynamic fatigue characteristics of the blade are studied in this paper. A three-dimensional model of the blade is established and its constraint modal are analyzed by both simulation and experiment. The results show that the deformation of blade is proportional with the increase of natural frequency, and the stress concentration is easy to occur at the root of blade. Meanwhile, the dynamic fatigue test of the blade is carried out, and it can be found that the root of the blade breaks at the rotational speed of 750r/min, which verifies the correctness of simulation results. Therefore, it is necessary to effectively adjust the control speed to ensure the normal rotation of the blades and reliable operation of the machine.
Numerical simulation of oil droplets spreading on solid surface in water
Authors: Chen Zhiwen , Yang Xiaoyong , Wang Bingjie , Dai Jian , Bai Zhishan 
Published: June 2021

Abstract
Plate separators are widely used for oil-water separation in the petrochemical industry. The spreading process of oil droplets at the solid surface is the key to understanding the oil-water separation mechanism in the plate separator. This study uses VOF method to capture oil-water phase interface change and sets up a two-dimensional model of oil droplets spreading on solid surface in water. The influences of droplet diameter, oil-water interfacial tension and viscosity are studied. The numerical simulation results show that the maximum spreading length of oil droplets increases with the increase of droplet size and interfacial tension. The average spreading speed of oil droplets decreases with the increase of oil droplet size, and increases with the increase of surface tension. The maximum spreading length and average spreading speed of oil droplets decrease with the increase of the dynamic viscosity of the oil droplets.