bluuebunny/crossref_metadata_2025_split huggingface dataset:
Printed hydrogels with orderly distributed nanowire
Authors: Gao Tinghao , Zhao Weiwei , Chen Lijin , Hu Sanming 
Published: July 2021

Abstract
Nanocomposite hydrogels have diverse properties and considerable advantages in biomedical applications when compared with pure hydrogels. In this work, a CNT-pHEMA hydrogel composite is constructed using 3d printing. CNTs are distributed in an orderly manner inside the hydrogel matrix. The mechanical properties of this hydrogel have been characterized in terms of their anisotropic tensile modulus, which thereby proves the orderliness of embedded CNTs. The reported 3D printing method on manipulating the directions of nanowires inside the hydrogel can help the development of flexible smart components with complex characteristics in various applications.
Extreme High Speed Laser Cladding 316L Coating
Authors: Qiulin Wang , Yong Li , Jinbo Zhu , Mingfu Li , Zhengxing Men 
Published: July 2021

Abstract
Using extreme high speed laser cladding technology, 316L coating was prepared on 45 steel shaft. The microstructure of the coating was observed by scanning electron microscope (SEM), and the wear resistance and corrosion resistance of the coating were tested. The results show that the coating prepared by the extreme high speed laser cladding technology has high surface flatness, no obvious cracks, voids and other defects, high density, good combination with the substrate, and fine grains. The middle and lower crystal grains are dendritic, which grows perpendicularly to the surface preferentially, and no obvious secondary dendrites are seen. The size of the dendrites in the lower part of the coating gradually decreases from the bottom to the top of the molten pool, and the top layer transforms to equiaxed grains. The dilution rate is 4.4%. The fine-grain strengthening mechanism improves the wear resistance of the coating, and the wear resistance is increased by about 31.8%. The wear mechanism is mainly abrasive wear. A stable chromium-rich oxide film is formed on the surface of the coating, and its corrosion resistance is greatly improved, but this film will be destroyed by highly concentration of Cl-.
Effect of laser heat input on the properties of cladding layer
Authors: Che Pengcheng , Dai Haiyan , He Huaizhi , Cheng Guangfu , Zhou Jingchao , Ren Zhiyuan 
Published: July 2021

Abstract
By means of optical microscope, SEM and EDS, the microstructure of laser cladding layer under 1200W laser heat input was analyzed. Through the research, the relationship between precipitate characteristics and properties of the cladding layer was studied, and failure reason was found. The results show that Co, Cr and W elements have the tendency of short-range diffusion in the surface region in Stellite 6 alloy with a jagged shape. In this area, Co-Cr-W-Fe precipitated and hardened layer formed with high hardness and abrasive resistance but a lower ductility. Meanwhile, intergranular phase M23C6 precipitated. Some parts the big temperature gradient and overheat accelerated the precipitation process, led to the incomplete fusion of dendritic crystal, crack initiation and propagation on account of the integrated factors. Some solutions were put forward to reduce the failure risk.
Research on Repair of the Damaged Circular Parts Based on the Deterministic Electrochemical Deposition Method
Authors: Li Dan , Yuan Jianhu , Shen Xinmin , Yang Fei , Zhang Xiaonan 
Published: July 2021

Abstract
Deterministic electrochemical deposition method are proposed and developed for the repair of the damaged circular parts, shape accuracy of which is not up to standard due to wear. The surface profiler is used to determine the morphology of the damaged parts to be repaired. On the basis of deterministic surface forming theory, the proposed electrochemical deposition technology is used to perform deterministic repair of the parts to be repaired. The repaired shaft parts are measured with a surface profiler. The experimental results show that the deterministic electrochemical deposition repair can obtain high shape accuracy and smooth surface quality, and it has strong reliability. It is effective and promising in the precise repair of the damaged circular parts. The proposed method has important application significance.
Optimization of vibration performance of range extender based on structural parameters
Authors: Yi-fan Chen , Hui-hua Feng 
Published: July 2021

Abstract
In this paper, the simulation model of the range extender system is established to calculate the torsional vibration performance of the shafting system, and the calculation results of the speed nonuniformity and torsional vibration amplitude are obtained. After analyzing the influence of shafting structural parameters on vibration results, the design parameters of torsional damper, flywheel, generator rotor and coupling are optimized through grouping calculation and neural network model based on optimization, so as to improve the vibration performance of shafting.
Fatigue performance test of exoskeleton leg component based on composite materials
Authors: Peng Xuefeng , Dai Zongmiao , Liu Jiasheng , Liu Huabin 
Published: July 2021

Abstract

In order to meet the requirements of lightweight structure design of exoskeleton robot, this paper proposes a T700 carbon fiber exoskeleton leg component based on composite material. By analyzing the function and characteristic of the leg component, a new kind of leg component combined with titanium alloy and T700 carbon fiber was designed. The fatigue performance of the new leg component was tested. The results show that no fatigue failure occurs when the leg component are repeatedly loaded 50 times in the direction of 90° and 45° and the loading force is 2000N. The failure tensile test shows that when the loading load reaches 1700N, fracture failure occurs and the connection interface is destroyed.
Parameter optimization of 7050 aluminum alloy drilling based on ABAQUS
Authors: Li Shuiping , Xu Kaifeng 
Published: July 2021

Abstract
For the drilling of 7050-T7450 aluminum alloy commonly used in the aerospace field, this article uses ABAQUS finite element software to establish a drilling simulation model of 7050-T7450 aluminum alloy. A simplified cutting model is created based on the actual cutting model, combined with the Johnson-Cook material constitutive equation, and then the actual drilling process is simulated. At the same time, through the use of orthogonal experiment analysis method, the influence of the four factors of tool diameter, drilling speed, feed rate and tool tip angle on the axial force and moment of twist drill is analyzed. The extremely poor method is used to determine the best cutting combination plan. According to the results of the orthogonal experiment, a multiple linear regression was performed using MATLABLE software, and a drilling model was established to obtain an empirical formula. The accuracy of the empirical formula is verified by comparing the calculation of the empirical formula with the simulation result, and it provides a reference for the actual processing.
Susceptibility to Surface Hot Shortness of a Cu-containing Steel
Authors: Wang Lei , Gu Huaizhang , Li Quan 
Published: July 2021

Abstract
The susceptibility to surface hot shortness of a Cu-containing low alloy steel has been investigated using high temperature treatment tests in air. The grain boundary oxidation of this steel is very serious after soaking at 1100°C for 60 minutes. The oxidation rate of grain boundary was faster than that of internal oxidation at 1100°C but the opposite phenomenon was occurred when the soaking temperature is 1200°C. The phenomenon has an important impact on the susceptibility to surface hot shortness of this steel.
Vibration transmission characteristics of complex lubricating oil pipeline system
Authors: Xingsheng Lao , Xian Gong , Lu Dai , Weijian Lyu , Wei Zhang 
Published: July 2021

Abstract
Considering the axial, lateral and torsional vibrations and considering the effect of Poisson coupling in the axial vibration, ignoring the effect of friction, based on the Timoshenko beam model, a dynamic model of the lubricating oil pipeline system with force and speed as variables is established. Using lubricating oil pumps and valves as vibration sources, the vibration characteristics of multi-branch lubricating oil pipeline systems including elbows are studied. The results show that due to the coupling of lubricating oil and pipeline structure, the vibration peak and peak frequency of pipeline system are significantly reduced, but the frequency lateral vibration response amplitude increases significantly at some characteristic frequency; when the pipeline support stiffness increases, the natural frequency of the pipeline increases, causing the peak frequency of pipeline vibration to shift to high frequency, and the peak frequency resolution increases.
Design of the Muzzle Coil Structure of the Missile-borne Speed Test System
Authors: Liu Bingnan , Fang Liqing , Guo Deqing 
Published: July 2021

Abstract
The muzzle coil structure of the missile-borne self-velocity testing system for small-caliber grenade weapons was designed, and the wire selection, current-carrying calculation and actual testing were completed. Different from the traditional external speed measurement method, the self-test speed device changes the external induction coil into an energized coil, and uses the principle of electromagnetic induction to complete the self-test speed of the missile.
Influence of composition and microstructure on the properties of PTFE/Mg reactive materials
Authors: Wu Zhouyang , Liu Jinxu , Guo Yunshu , Feng Xinya , He Chuan 
Published: July 2021

Abstract
To investigate the effect of composition and microstructure on the properties of PTFE/Mg reactive materials, four composition ratios were designed and eight kinds of PTFE/Mg reactive powders were prepared by ball-milling mixing and ultrasonic mixing. Subsequently, the bulk PTFE/Mg materials were obtained via cold isostatic pressing of the PTFE/Mg powders followed by vacuum sintering. The morphologies, heat of reaction and burning rates of the PTFE/Mg powders, as well as the microstructure and impact-initiated reaction characteristics of the bulk PTFE/Mg materials were comprehensively characterized. The results show that with the increase of Mg content, the properties of the materials prepared by the two mixing processes show different trends. In addition, compared to the PTFE/Mg materials prepared by ball-milling mixing, the PTFE/Mg materials prepared by ultrasonic mixing show higher heat of reaction and burning rate, and the corresponding bulk PTFE/Mg materials have more uniform microstructures and demonstrate enhanced impact-initiated reaction characteristics.
Research on the Influence of Different Paint Film Thickness Combination on Corrosion Resistance of Sandblasting Steel Plate
Authors: Zhang Huayuan , Xue Bing , Wang Can , Yue Yongyong , Luo Jing , Yan Ran 
Published: July 2021

Abstract
To guide the selection of paint film thickness scheme with high cost performance when spraying sandblasting steel plate. In this paper, we sprayed different film thickness with the combination of primer and topcoat on the sandblasting steel plate. The corrosion resistance was evaluated by neutral salt spray test and electrochemical test of different film thickness combinations. In addition, the corrosion morphology was analyzed by automatic inverted metallographic microscope. Furthermore, potentiodynamic polarization and electrochemical impedance (EIS) curves were used to analyze the corrosion mechanism. The self-corrosive current density (Icorr) is 1.999 × 10-12 A·cm-2 with the combination of primer and topcoat thickness (20 μm+20 μm) and the self-corrosive current density (Icorr) of low carbon steel matrix is 1.855 × 10-5 A·cm-2 from the analysis of polarization curves from kinetic potential. The impedance value on 0.01 Hz (|Z|0.01Hz) (4.56 × 1010 Ω·cm2) of the combination of primer and topcoat thickness (20 μm+20 μm) after immersing in 3.5 wt. % NaCl for 2 hours was more than eight orders of magnitude higher than the value (|Z|0.01Hz 6.52 × 102 Ω·cm2) of the low carbon steel plate after immersing for 0.5 hours. Even dipping in 3.5 wt. % NaCl for 168 hours, the |Z|0.01Hz value of the combination of primer and topcoat thickness (20 μm+20 μm) was still three order of magnitude higher than the low carbon steel plate with 0.5 hours immersion. Increasing the film thickness of the topcoat can improve the anticorrosion performance under the condition of a certain thickness of the primer. However, too thick coating will generally bring greater internal stress, which leads to the cracking of the coating in the process of use because of the change of external force and temperature, thus affecting the anticorrosion performance. When the total film thickness is certain, with the increase of the proportion of primer increase of the proportion of primer film.
Springback behaviors of tube numerical control bending under different geometrical parameters
Authors: Fang Jun , Lu Shiqiang , Wang Kelu , Liang Chuang , Min Xuguang 
Published: July 2021

Abstract
To realize the accuracy forming of diverse bent tubular components, the influences of geometrical parameters including the bending angle θ, the relative bending radius R/D, the outside diameter of tube D and the wall thickness of tube t on springback behaviors of high strength TA18 tube in numerical control (NC) bending are explored by finite element (FE) numerical simulation method. The results show that with increasing the θ or the R/D, the springback angle linearly increases, which can be described as a linear equation. With increasing the t, the springback angle first reduces and then increases, while the springback angle fluctuates mildly with increasing the D. Under the same D/t, the springback angle declines with increasing the D and t proportionally.
Preparation and Characterization of Laser Clad NiCrBSi Coating Reinforced with WC
Authors: Wang Dongsheng , Chu Jiaqing , Qu Guang , Zhou Xinhua 
Published: July 2021

Abstract
NiCrBSi coating reinforced with WC was prepared on the steel substrate surface of 42CrMo alloy structure based on coaxial powder-feeding laser cladding technology by using the YLS-6000 fiber laser. Phase composition, microstructure, microhardness and wear resistance of specimens were discussed by the X-ray diffractometer (XRD), scanning electron microscope (SEM), microhardness meter and ring-block friction wear testing machine. Results demonstrated that the composite coating is mainly composed of γ-Ni solid solution and WC, accompanied with phases like FeNi3, B2Co3, CoCx, FeCr0.29Ni0.16C0.06, W3C and Co3W3C6. The top, middle and bottom of the cladding layer are occupied by tiny dendrites, coarse columnar dendrites and cellular crystals perpendicular to the interface. Moreover, good metallurgical bonding is formed between the coating and base. Hardness and wear resistance of the composite coating are far higher than those of the 42CrMo base. According to west test, the base presents typical adhesive wearing characteristics, while the composite coating mainly shows abrasive wearing performances.
The influence of SLA process parameters on the property of alumina
Authors: Chen Haida , Chen Bin , Li Jie , Yan Hengfeng , Cheng Liying , Chen Jimin , Zeng Yong 
Published: July 2021

Abstract
Ceramic stereolithography (SLA) was used to fabricate a ceramic. A ceramic 3D printer based on the SLA method was manufactured. In order to systematically and effectively evaluate the role of the parameters in the ceramic green body, the orthogonal test method is introduced. The placement position of the parts, the laser repetition frequency, and scanning speed are used as independent variables to be studied. The final result shows that when laser power is set, the relationship between the hardness of the part and the position of the part is not evident. The speed of laser scanning greatly influences the mechanical properties of the parts. Alumina parts with smooth surface and dense microstructure were obtained after debinding and sintering processes.
Effect of brazing parameters on microstructure and mechanical properties of TMC/Si3N4 joint
Authors: Shi Kangqiao , Li Min , Zhu Dongdong , Dong Duo , Xie Lei , Zhang Tong 
Published: July 2021

Abstract
A multilayered filler made up of Cu foam and Ag-28Cu foils was used to successfully braze (TiB+Y2O3)/titanium matrix composites (TMC) and silicon nitride ceramics (Si3N4). The microstructure of the TMC/Si3N4 joints obtained at different brazing parameters was investigated. The results showed the interfacial structure of the joints is composed of TiCu, TiCu2, Ag (s, s), Cu (s, s), TiN and Ti5Si3 phases. The growth equation of the TiN layer was established and its thickness was increased with respect to the brazing time and brazing temperature. Optimal shear strength of approximately 180 MPa was achieved when the joint was brazed for 10 min.
Influence of pad under rail on the mode of fastener clip
Authors: Huan Liu , Qiutong Li , Yan Liu , Xiujie Jiang 
Published: July 2021

Abstract
To explore the influence the rail pad structure of the DT-III fastener system on the clip modal analysis, the finite element model of the DT-III fastener system was established. By adjusting the width and depth of the rail pad groove, the clip assembly modal responses with different rail pad structures are obtained. The results show that the groove depth and width of the rail pad have great influence on the fastener system stiffness. In the assembly state of the clip, with the increase of the groove depth and width of the rail pad, the first-order mode frequency of the clip decreases gradually, and the frequency range is 850Hz-930Hz. Therefore, the rail pad structure can be reasonably designed based on the rail corrugation and train speed.
Study on A New Deformation Resistance Model and High Temperature Flow Behaviour of High Cr N80 Steel
Authors: Li Jingwei , Yu Wanhua , Lv Juan , Jia Li 
Published: July 2021

Abstract
The purpose of this paper is to discuss a new deformation resistance model and high temperature flow behaviour of high Cr N80 steel. Through the single-hit hot compression test with true strain 0.7 at strain rate 0.1s-1,1s-1,10s-1,40s-1 from deformation temperature 700°C to 1200°C by Gleeble-3500 thermomechanical simulator, the flow stress curves of the dynamic recovery type are obtained. The influence of deformation temperature, strain rate on the flow stress is systematically analysed. Furthermore, a new and highly precise Zhou Jihua-Guan Kezhi deformation resistance model of high Cr N80 steel is established through the test data. The calculated results of the model are in good agreement with actual test results. The correlation coefficient (R) is 0.993. Most of residual errors between the measured values and the predicted values by the model are within ±30MPa.
Study on the effect of hot working parameters on deformation resistance of duplex stainless steel
Authors: Qi Peng , Ren Facai , Xu Jinsha 
Published: July 2021

Abstract
Duplex stainless steel is widely used in petrochemical industry because of its good comprehensive mechanical properties. In this paper, hot compression tests of UNS S32760 duplex stainless steel at different strain rates and temperatures were carried out. The influence of strain rate and deformation temperature on deformation resistance of duplex stainless steel is analyzed.
Research and application on an embedded cabin non-contact detection and precision docking technology
Authors: Li ChangXun , Tang Laiying , Feng Wei , Wang ChenXing , Sun Wei , Zhao Kai 
Published: July 2021

Abstract
In the assembly missions of spacecraft, the cabins docking are the final part of the product assembly to form the probe into a whole, which is one of the most critical parts of the assembly task. The spacecraft of Insertion and Containment in cabin docking faces difficulties such as eccentricity of mass, small safety spacing, and non-visibility. In this paper, interference detection method based on reverse engineering non-contact virtual assembly and precision docking process method with tiny spacing of cabin eccentricity were proposed, and a large eccentric inline cabin docking device was developed to solve the problem of inline cabin precision docking. The above-mentioned method was applied to achieve nearly 100 successful dockings during the AIT process, which ensured the success of the spacecraft mission.
Research on the layout problem of typical ship cabins considering maintainability
Authors: ao Cui , jin-e Huang , shao-song Min , jie Jiang , xiang-bing Huang , ran-ran Zhang 
Published: July 2021

Abstract
With the rapid development of the technology of ship manufacturing and computer-aided design, the application of computer intelligent algorithm to study ship cabin layout problems has been widely used. However, the main consideration to solve the problem is to meet the functional requirements and the maintainability of the equipment hardly can be considered. Furthermore, while maintainability indexes are taken into considered, accessibility is the main consideration index, and other design indexes of maintainability couldn’t be considered enough. Considering this case, this paper established a mathematical model of ship cabin layout considering maintainability throughout analyzing the maintainability design indexes firstly. Secondly, it combined with the characteristics of ship cabin and the requirements of relevant specifications to build the mathematical model. Finally, this paper selected a certain type of fishing vessel and optimized it by using genetic algorithm. Under the condition of meeting the relevant specifications of ship construction, the maintainability design level of cabin equipment is improved. The research results could provide a preliminary reference for the layout and design of ship cabin equipment.
Analysis of Abnormal Tank Volume Curve in Calibration Process of Horizontal Metal Tank Volume Comparison Method
Authors: Yong Wan , Jiamin Lu , Yizai Liu 
Published: July 2021

Abstract
This paper introduces the works, calibration process and data treating method of the horizontal metal tank system calibration by the volume comparison method. Nine typical abnormal tank volume curves are analyzed in this paper, which not only helps to improves the operating skills and work efficiency of the industry technicians, but also ensures the accuracy of the calibration results of the volume comparison method.
Analysis on safety status of special purpose motor vehicles in defined fields
Authors: Luo Hongqi , Liu Xia , Wang Po 
Published: July 2021

Abstract
Special purpose motor vehicles in defined fields have the characteristics of low speed and strong mobility. From the motor vehicle accidents in the field over the years, the causes of the accidents are mostly the weak safety awareness of the users, improper management, illegal operation or improper operation of the drivers, etc. This paper analyzes the annual change trend of the ownership of special motor vehicles, the number of accidents and illegal operation in the field (factory). The results show that the ownership of vehicles increases rapidly, the number of accidents and illegal operation data does not increase significantly, but the proportion of illegal operation shows a downward trend.
Truss optimization using genetic algorithm and FEA
Authors: Li Wenrui , Yao Qi , Cao Siting , Qiu Jiyuan , Wei Haolin 
Published: July 2021

Abstract
How to optimize the quality of the truss so that the truss meets the load-bearing requirements has always been a key issue of research. In this paper, a genetic algorithm (GA) and finite element analysis (FEA) based optimization method is proposed for the size and topology of a space truss. According to the results of space truss, four kinds of components are divided and their cross-sectional areas are optimized respectively. The coded value on the chromosome in GA is used to represent the truss topology, and the adjacent value represents the adjacent truss structure. The nodal displacement and member stress of the truss are solved by finite element method to ensure the safety of the truss. All work is done using python.