bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of Variable Wheelset Steering Stiffness and Yaw Damper Damping on Hunting Stability
Authors: Zhang Lixin , Wang Qi , Yu Yunhai 
Published: November 2020

Abstract
Due to the track curvature and irregularities difference, a high-speed dedicated railway vehicle running on a high-speed railway cannot achieve a good dynamics performance when it is operated on an existing railway for conventional low-speed railway vehicle. Then an adaptive bogie which can adjust its suspension parameters, like the steering stiffness of wheelset and the damping of yaw damper, is regarded as a solution to make the high-speed train be operated on an existing railways. In this investigation, a highly nonlinear dynamics model of the adaptive bogie vehicle multi-body system is built to study the effects of wheelset steering stiffness and yaw damper damping on the vehicle dynamics. Both a straight track passing and curved tracks negotiating scenarios are considered to examine the expected range of stiffness and damping when the bogie was operated those two kinds of railways. It shows that reducing the steering stiffness of wheelset leads to a significant decrease in the critical speed of vehicle, and the critical speed of vehicle decreases significantly when the yaw damper damping is less than 500 kN⋅s/m. In case of wheel wear, the smaller the wheelset steering stiffness or the yaw damper damping is, the lower the critical speed of vehicle is. Through the analysis, the limit values of wheelset steering stiffness and yaw damper damping are proposed. When the adaptive bogie vehicle operates on the existing track, the lower limit values of wheelset steering stiffness and yaw damper damping are 12 MN/m and 200 kN⋅s/m respectively.
Shape Memory Characteristics in Welded SMA Alloys
Authors: Wang Wei 
Published: November 2020

Abstract
This paper mainly studies the laser welding properties of shape memory alloys. Phase transformation of the laser welded SMA alloys was investigated through XRD and DSC. The stress-strain behaviors and shape memory effects of the laser weld joints were investigated with tensile tests at room temperature or variable temperature, respectively. DSC test project is the result of the effect and influence of the test welding process on the heat affected zone. The results show that laser welding alloy is beneficial to the refinement of weld structure and improves the mechanical properties and shape memory of weld.
Research on Innovative Application Technology of Thin-layer Rapid Repairing Materials in Damaged Passageways of Yard Cranes
Authors: Yanyan Dai , Jiahuan Yu , Qianting Yang 
Published: November 2020

Abstract
The number and severity of the damaged yard crane passageways on the wharfs are increasing year by year. Based on the research results of thin-layer repairing of the damaged passageways of yard cranes at home and abroad in recent years, this paper analyzes the characteristics and hazards of thin-layer disease of concrete pavement and measures the mechanical properties and durability of thin-layer rapid repair materials through setting time test, mechanical test, abrasion resistance test and frictional coefficient test. It is concluded that its properties can meet the requirements of thin-layer repairing technology, and some engineering examples of thin-layer rapid repair are listed in this paper.
Study on the Application of Graphene Polymer Material in Sports Equipment
Authors: Fu Baoyan , Gao Jianxin 
Published: November 2020

Abstract
With the continuous development of science and the level of modern sports, scientists and sports workers all over the world have realized the importance of the application of new materials in sports equipment. Through the analysis of graphene rubber and graphene fiber, we have found the function of graphene rubber and graphene fiber in some fields. These materials include graphene rubber composites, graphene fiber composites and graphene magnesium matrix composites which can be used in the field of sports equipment. So we should further explore the application prospect of graphene polymer materials in sports equipment. By using the methods of literature, comparison and qualitative analysis, this paper takes the graphene rubber composite polymer material and the graphene fiber composite polymer material as the research object, and applies the graphene technology to the sports equipment such as shoes, rackets, bicycles, etc. The analysis of existing graphene technology can theoretically explore the application of graphene technology in sports equipment, realize the organic combination of graphene field and sports field at the theoretical level, and promote the application of graphene technology in sports field.
Study on Synthesis and Performance of Low-bleeding Polycarboxylate Superplasticizer
Authors: Guangxing Lai , Jianli Yin , Yunhui Fang , Shuyi Lai 
Published: November 2020

Abstract
A low-bleeding polycarboxylate superplasticizer was synthesized by using 4-hydroxybutyl vinyl polyoxyethylene ether (VPEG) as the macromonomer and unsaturated polyhydroxy compound (BD) as the functional monomer. The synthesis conditions were optimized by single factor method. The structure of the polymer was characterized by infrared spectroscopy (FTIR) and gel permeation chromatography (GPC), and the properties of the synthesized samples were examined using paste, mortar and concrete. The results showed that when the BD content was 2.0%, the polycarboxylate superplasticizer PCE-HR had better comprehensive properties. Compared with the standard polycarboxylate superplasticizer PCE-S, PCE-HR had excellent performance in water retention, slump protection and reinforcement.
Application of Poly(N-isopropylacrylamide) As Thermosensitive Smart Materials
Authors: He Wen , Ma Yefei , Gao Xing , Wang Xiaoxia , Dai Xia , Song Jibing 
Published: November 2020

Abstract
Drug delivery systems refer to a technical system capable of comprehensively regulating the distribution of drugs in a living body in terms of time, space and dose. As thermosensitive smart materials, Poly(N-isopropylacrylamide) (PNIPAM) is an ideal treatment platform for the development of drug delivery systems. This article focuses on the application of various thermally sensitive smart materials such as nanoparticles, nanofibers, hydrogels, and self-assembled micelles in drug delivery systems prepared by PNIPAM in recent years. The future development of PNIPAM thermosensitive smart materials is also discussed.
Preparation and Properties of Solvent-induced Discoloration Polydiacetylene Sensors
Authors: Wang Hui , Yu Jiaxin , Li Yancheng , He Wen , Han Li , Gong Weijuan 
Published: November 2020

Abstract
Polydiacetylene (PDA) films were prepared from 10, 12-pentacosadiynoic acid monomers by 1, 4-addition polymerization. The PDA sensors had different discoloration properties for different solvents. With the increase of time, the appearance color of the sensor changed from blue to red. The fluorescence properties of the films were studied by fluorescence spectra. There was no fluorescence phenomenon in blue-phase PDA, but there was fluorescence phenomenon in red-phase PDA film. The fluorescence signal peak appeared at 570 nm. In addition, the PDA polyvinyl alcohol (PVA) film and PDA test paper were prepared with PVA and filter paper as substrates, and their properties were studied. The PDA test paper shows a better tendency to change color from blue to red to the solvent, and the discoloration can complete in 1 s.
Elastic Region of Continuous Medium
Authors: Wang Huanyou , Tan Qiaolai , Jin Gui 
Published: November 2020

Abstract
In this paper, the elastic region model of continuous medium is established, and their constitutive relations are determined in mathematical form. The geometric properties of the deformation of the continuous medium are studied, and the spatial position and direction of each part of the continuous medium caused by the deformation are determined. We emphasize that the thermodynamic basis of the displacement concept is a finite size equilibrium region and a quasi-static process. Just from the macro point of view, the main mechanical problem of continuous medium should be how to find out its stress-strain relationship reasonably within the framework of the ancient elastic theory. This complex mesoscopic analysis will help to understand the size and constitutive relation of materials parameters, but it will not change the basic structure of elastic theory.
The Application of Silicon Carbide in PCU
Authors: Li Jiangheng 
Published: November 2020

Abstract
The development of new energy vehicles has brought unlimited possibilities for the development of the automotive industry. One of the critical components is the Power Control Unit (PCU) in the motor. Nowadays, silicon-based power semiconductors no longer meet the needs of today’s new energy vehicles, so siliconized synthetic materials has become the development direction. This paper briefly introduces the vital role of PCU in EV / HEV and analyzes the significance of new materials in this field.
Flow Stress Modeling using the Material Constitutive Model of Modified Zerilli-Armstrong
Authors: Yu Hong , Shao Zhenzhen , Ren Facai 
Published: November 2020

Abstract
The high temperature compression tests of 2Cr13 martensitic stainless steel under the deformation conditions at the temperatures between 1000°C and 1150°C with strain rates between 0.01s−1 and 10s−1 were carried out by using the Gleeble simulator. A new material constitutive model of modified Zerilli-Armstrong to predict 2Cr13 martensitic stainless steel flow stress behavior was developed.
Residual stress and deformation analysis on thermal shrink-fitted joint in the semi built-up marine crankshaft
Authors: Duan Jianguo , Long Xintao , Zhang Qinglei 
Published: November 2020

Abstract
Interference and deformation of the shrink fitting connection have a significant influence on the local stress state at the contact area. To improve its assembly quality, an optimized induction heating method with an arc-shaped frame coil and a cylinder type coil was developed. The effects of shrink fitting parameters such as residual contact stress and dimensional deformation were researched using finite element analysis (FEA). A thermal-structure coupling model of crankshaft shrink fitting was built, and contact stress evaluations of the measurement points in the shrinkage were obtained by numerical simulation. In addition, contact stress and deformation analysis under different interferences were also carried out to determine the range of values. The simulation and comparative analysis results show that the optimized multiple induction heating method with an arc-shaped frame coil and a cylinder type coil would be helpful to improve the uniformity and sustainability of contact.
Microstructure and mechanical properties of B4C ceramics by spark plasma sintering
Authors: Song Qi , Zhang Zhaohui , Liu Luojin , Hu Zhengyang , Wang Hao 
Published: November 2020

Abstract
B4C ceramics with the addition of (2.5 % (Ti3SiC2+Si) +2.5 % CeO2+5 % ZrO2) and (2.5 % (Ti3SiC2+Si) +2.5 % La2O3+5 % ZrO2) as sintering aid were fabricated by spark plasma sintering process at 1650 °C by applying 80 MPa pressure. The second phases produced by chemical reaction and the mechanical properties of these two ceramics were analysed detailed. The as-sintered ceramics exhibited good comprehensive mechanical properties, including the flexural strength of 485.8 MPa and 493.4 MPa, the fracture toughness of 4.9 MPa⋅m0.5 and 5.4 MPa⋅m0.5 as well as the Vickers hardness of 34.2 GPa and 34.8 GPa, due to the reduction of grain sizes, the formation of second phases and the energy dissipation resulted from the intergranular fracture.
Stress and Strain of Plant Polysaccharides Aerogels and Their Effects on Mechanical Properties
Authors: Zheng Han , Wang Hao , Tian Yuan , Wang Xu , Tian Yongfeng , Zhan Jianbo , Fu Rongrong 
Published: November 2020

Abstract
In order to verify the mechanical properties of plant polysaccharides aerogels, the polysaccharide aerogels were prepared by freeze-drying method. The aerogels were screened by raw material selection and mass ratio, and their mechanical properties were tested. The experimental results show that with the increase of starch content, the compression modulus increases gradually, and the elasticity decreases linearly with the increase of starch content. The main effect on the mechanical properties is that after the addition of polysaccharide macromolecules, they are entangled with KGM and gelatin skeleton molecules. The increase of concentration increases the interaction sites, and the intermolecular force increases.
Tribology performance analysis of oil for wet drive axle
Authors: Penghou Zhen , Yuexing Wang , Haizhen An , Li Chen 
Published: November 2020

Abstract
In order to solve the problems caused by the use of common gear oil in the wet drive axle, such as abnormal braking noise, excessive braking distance and severe wear of components, the special oil for the wet drive axle is developed in accordance with the new requirements for lubricating oil after the technical upgrade of the drive axle. Based on the actual braking condition of the wet brake, the oil tribology performance of the wet drive axle is tested and studied by using the brake test bench and increasing the energy density to improve the harshness of the braking condition. The results show that the method can distinguish oil with different tribology performance. The developed oil is superior to the reference oil in formulating smoothness, stability and mechanical transmission efficiency, providing better friction retention over long periods of use.
Study on martensitic transformation of Fe - based alloys with low relaxation based on constant strain constraint
Authors: Liu Linlin , Wang Xinyi , Du Jinqiao 
Published: November 2020

Abstract
The paper analyzed the martensite transformation characteristic of Fe-Mn-Si alloy by XRD analysis and tensile test under different deformation condition. In this study, the amount of ε martensite of Fe-17Mn-5Si-10Cr-5Ni alloy was lower than that of Fe-17Mn-5Si-2Cr-2Ni-1V alloy under the same deformation condition, but the change rate of ε martensite was much higher than that of Fe-17Mn-5Si-2Cr-2Ni-1V alloy, and the stress relaxation rate of the both alloys increased with the increase of the stop loading time, and the relaxation rate of the Fe-17Mn-5Si-10Cr-5Ni alloy was obviously higher than that of Fe-17Mn-5Si-2Cr-2Ni-1V alloy. (Abstract)
Effect of Different Molding Process on Mechanical Properties of 316L Stainless Steel
Authors: Zong Xue-wen , Liu Wen-jie , Yang Yu-meng 
Published: November 2020

Abstract
The effects of laser selective melting (SLM) and rolling on the mechanical properties of 316L stainless steel were studied. The morphology and fracture characteristics after impact were characterized by means of an optical microscope (OM) and scanning electron microscope (SEM), Meanwhile, tensile strength, hardness, and impact toughness are characterized. The results show that compared with the roll forming, the 316L stainless steel group formed by laser selective melting has surface holes, cracks and spheroidization, and the grains are smaller, the dimples are smaller and shallower, and the strength and hardness are higher than the roll forming. Plastic toughness is much lower than that of rolling.
Research on the welding performance of X70 longitudinal submerged arc welding ultra-abyssal pipeline steel
Authors: Gao Jixiang , Liao Daobiao , Li Liejun , Zhou Feng 
Published: November 2020

Abstract
In this paper, Gleeble 3800 was used to simulate the changes in microstructure and properties of X70 ultra-abyssal pipeline steel at room temperature under different welding line energies. The industrial welding test of X70 pipeline steel was also conducted by adopting the 4-wire Longitudinal Submerged Arc Welded process. By optimizing welding process parameters, a reasonable welding specification process was developed. The results show that at different welding line energies, when the cooling time t8/5 is 12 ~50s, the microstructure of the welding coarse crystal zone is mainly lambellar bainite and granular bainite, and the uniform distribution of granular bainite exists in the austenite, obtaining better impact toughness. Ultra-abyssal longitudinal submerged arc welding steel producing by the optimized 4 - wire energy welding process has excellent mechanical properties and crack propagation resistance.
Research on Design and Performance of Optic-thermal Coupling Effect Evaluation System for Aerospace Material
Authors: Junwei Wang , Lei Zhang , Pengsong Zhang , Bing Bai 
Published: November 2020

Abstract
The optic-thermal coupling effect evaluation system for aerospace materials is mainly used to simulate the environment of solar radiation with different intensities in a constant-pressure and temperature-varying environment to test the photochemical effect and optic-thermal effect tolerance of aerospace materials. This paper introduces the key design and numerical simulation results of the system. The results show that the temperature and radiation intensity range of system is sufficient to meet the test requirements of the national military standard. The deviation between the temperature setting value and the measured value is within 0.5°C, and the light deviation is less than 5%.
Study on Self-piercing Rivet and Mechanical Properties of Aluminum Alloy Joint
Authors: Feng Bo , Huang Lu , He Hongyan , Cao Can , Zhang Suqiang 
Published: November 2020

Abstract
In this work, the self-piercing rivet (SPR) experiments were carried out and the mechanical properties tests under different SPR process were taken. The effects of SPR process on the geometric characteristics and strength of the joint were studied. It was found that the SPR joint under displacement-controlled process had larger interlocking value, higher mechanical properties, more stable geometric characteristics, and better mechanical properties. The failure mode of SPR joints was mainly pull-off failure. And the mechanical properties of SPR joints decreased with the increase of head height of SPR, while the residual thickness has no significant effect on the mechanical properties. The mechanical properties of SPR joints were significantly improved when structural adhesive was added into SPR joints, in which the failure mode was transformed into joint drawing failure. In addition, the fatigue behavior of SPR joint was studied. It was found that there was no significant difference between displacement-control process and energy-control process in fatigue performance of SPR joint. Moreover, cracks were initiated on the surface, which meet the surface initiation mechanism.
Reliability analysis of box-shaped steel column subjected to blast loading
Authors: Xi Kuantang , Li Xiangyang 
Published: November 2020

Abstract
Structural collapse caused by explosion and terrorist attacks often occurs. Steel columns, as the main load-bearing members of steel structures, often cause continuous structural collapse due to their damage. In order to study the reliability of steel column subjected to blast loading, box-shaped steel columns are taken as the research object, with considering the uncertainties associated with blast loading and material properties. Damage is determined according to damage index based on the ratio of the overall displacement and the local displacement to the maximum displacement. In this paper, P-I curves evaluation method and Monte-Calro simulation method are utilized to obtain the failure probability and cumulative distribution functions of the damage index. The results show the importance of considering the uncertainties in assessing the damage index of the columns against explosion. Also, sensitivity analyses show that damage index has the highest sensitivity to peak reflected pressure.
An Analytical Method of Three Dimensional Elastic Solids
Authors: Hu XW , Zhang WX 
Published: November 2020

Abstract
According to the variational principle, the basic governing equations of three-dimensional elastic problems in symplectic system are established. According to the characteristics of Hamiltonian operator matrix, the boundary condition problem is transformed into eigenvalue and eigensolution. It is shown that the zero eigenvalue solutions include the solutions of tensile and bending problems in material mechanics, while the non-zero eigenvalue solution can describe the solutions of local deformation such as stress concentration caused by boundary conditions.
Symplectic Solutions in Stress Analysis of Thin Plates
Authors: Zhang WX , Zhou SQ 
Published: November 2020

Abstract
Aiming at the common elastic thin plate materials in engineering, the dual control differential equation and the complete solution space composed of zero eigensolution and non-zero eigensolution are established in the state space. On this basis, the non-homogeneous condition of the boundary and the solution method of the non-homogeneous equation are studied systematically. The stress distribution of thin plate bending problem is discussed with an example, and the stress concentration of material under special constraints is analyzed.
Study on Performance Aging of Nonmetal Low Voltage Metering Cabinet Shell in Typical Environmental Conditions
Authors: Angang Zheng , Xiangyu Yuan , Huaiying Shang , Suqin Xiong , Siyu Chen , Da Cheng , Hui Chen , Yifan Wang 
Published: November 2020

Abstract
One of the key technologies in the field of smart grid measurement is to make a breakthrough in the detection and evaluation of high availability materials in smart measurement equipment. Under the comprehensive cross action of multi environment, how to combine the nonlinear evolution and mathematical model to analyze the complex environment into the feature combination of multiple single environmental factors, and how to find the key parameter features to express the aging life of materials is the focus and difficulty of the research. On the basis of service life model, the research on protection measures and life assessment technology of smart grid measurement equipment can make the equipment realize wide area application and high availability under worse conditions.
Corrosion Analysis of Connecting Bolt Used for Terminal Block of Isolation Switch in 220kV Substation
Authors: Chen Hao , Gong Weiwei , Qiao Xin , Sun Yunfei 
Published: November 2020

Abstract
Isolation switch is mainly composed of insulation part, conductive part, supporting frame, transmission mechanism and operating mechanism, which is of great importance for the safety and stability of power grids. In this paper, the seriously corroded connecting bolts used for terminal block of isolation switch in 220kV substation was investigated by means of macro-morphology inspection, hardness testing, zinc coating thickness measurement, scanning electron microscope, microstructure analysis and energy spectrum analysis. The result showed that the poor quality of the zinc coating was the main cause of the corrosion failure of the bolting and the gap between the bolt and the aluminium terminal block provided electrolyte environment for galvanic corrosion. In addition, targeted suggestions were put forward in order to improve the corrosion resistance of the connecting bolts and avoid the similar corrosion failure.