bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dynamic characteristics of dry-type transmission tower under wind-sand load
Authors: Li Fule , Yuan Binxia , Dai Jingjing 
Published: August 2024

Abstract
The desertification in Northwest China is serious, and the transmission tower has been affected by dust storms. To investigate the harm of wind-sand load on transmission towers, the paper takes the dry-type transmission tower as the research object and uses ANSYS software to study the dynamic characteristics. The wind and sand loads are coupled and su-perimposed by MATLAB software. The dynamic characteristics of transmission towers under different wind load and sand load conditions are studied. The results show that the horizontal offset and the overall stress of the tower will increase under wind-sand coupling load, which makes the tower stability worse.
The effect of the propellant type size on combustion performance of the multi-nitro ester propellant
Authors: Wang Tao , Chen Ling , He Weidong 
Published: August 2024

Abstract
To study the effect of propellant size on the combustion performance of the propellant, the combustion performance of three propellant types and their different ratio of inner perforation to diameter were studied by using the combustion experiment and data processing method of multi-nitro ester propellant as the research object. The results showed that within the test drug size range, under different initial temperatures and filling density conditions, the larger the ratio of charge length to the diameter of single-perf, 7-perf, and 19-perf propellant is, the larger the burning rate will be under the same pressure at the initial stage of combustion. The larger the length-to-diameter ratio of 7-perf and 19-perf propellants of the same type is, the better the gradual combustion will be, and the less influence there will be on single-perf propellants. The loading density has a certain effect on the constant volume combustion performance of the propellant: the higher the loading density is, the lower the combustion rate will be, which is because the erosion combustion phenomenon of the initial combustion of the propellant decreases with the increase of the loading density.
Investigation of oxide inclusion films in cast superalloy impeller
Authors: Zhang Lihui , Chen Jun , Xing Weijie , Wu Wenjin , Guo Fengwei , Zhang Qiang , Liu Changkui 
Published: August 2024

Abstract
Oxide inclusions are commonly found in casting alloys. During vacuum investment casting of polycrystalline nickel-based superalloy, various forms of oxide inclusions can be observed, including membrane-like inclusions. These oxide inclusion films can significantly reduce the mechanical properties of nickel-based superalloys. A cast superalloy impeller that fractured due to internal oxide inclusion films was analyzed in this article. The objective of this article is to analyze the morphology and composition of oxide inclusion films and investigate their formation mechanisms. This article uses a scanning electron microscope and transmission electron microscope to characterize oxide inclusion film samples. The results show that the oxide inclusions are composed of film-like alumina, magnesium-aluminium spinel, and magnesia particles encapsulated by magnesium-aluminium spinel films. The oxide inclusion films are formed through a reaction between the liquid metal melt and the magnesia crucible. These oxide films are then floating into the nickel matrix through the scouring of the liquid metal melt and become internal inclusions.
Study on the properties of solidified materials of municipal waste incineration ash cementitious materials
Authors: Wang Ke , Weng Zhan , Zhang Jinghui , Du Jiahui , Li Mingfu , Liu Tiejun 
Published: August 2024

Abstract
MSWI FA needs to be treated effectively to prevent harmful effects on the environment and human beings. The use of different ratios of cementitious materials for the solidification of fly ash provides innovative ideas for the environmentally friendly treatment of MSWI FA. In this study, some raw materials were used to solidify fly ash, and it was revealed that the incorporation of appropriate concentrations of fly ash (20 and 30%) could improve the compressive strength, fluidity, pore structure, and rheological properties of the solidified materials, and reduce the setting time, the bleeding rate, and inhibit the phenomenon of drying shrinkage of the solidified materials. However, when the content of MSWI FA exceeded 40%, the performance of the solidified material decreased significantly due to the poor volcanic ash activity and the high water absorption capacity of MSWI FA.
Effect of process parameters on the temperature field of laser sintering of nylon PA2200 powder
Authors: Liu Kai 
Published: August 2024

Abstract
Utilizing the ANSYS finite element analysis software, a three-dimensional heat transfer finite element model for the SLS forming process of nylon PA2200 powder was constructed. The APDL parametric language was employed to control the movement of the Gaussian heat source, enabling numerical simulations of the temperature field during the single-layer, single-pass sintering process. Through numerical simulation analysis, the varying pattern of the melting width was derived. Based on the optimal overlap rate required for satisfactory SLS forming quality, the optimal parameter combination for nylon PA2200 powder sintering was determined to be a laser power of 40 W, a scanning speed of 5000 mm/s, a layer thickness of 0.12 mm, and a preheating temperature of 165°C. These findings provide valuable insights for optimizing the SLS process and enhancing the quality of the final sintering parts.
DLP 3D printing of high-resolution, temperature-responsive hydrogel microneedles with rapid customization capability
Authors: Zhou Xinmeng , Liu Huan , Li Huanjun 
Published: August 2024

Abstract
Hydrogel microneedles (MNs) are emerging as versatile transdermal drug delivery platforms for the treatment of various diseases. However, their conventional preparation method is plagued by a complex process, time-consuming nature, and low resolution. To address these challenges, we present a novel method for preparing temperature-responsive hydrogel MNs using a Digital Light Processing (DLP) strategy. The printed NIPAM-AA-AM hydrogel MNs can be rapidly customized (within 1 hour) into various shapes and heights with high resolution. The mechanical tests and H&E staining validate the ability of the MNs to penetrate the skin. In addition, the temperature-responsive drug delivery of the MNs was demonstrated through experiments and COSMOL simulations. Notably, these biocompatible microneedles showed non-toxicity in NIH-3T3 cells and low hemolysis rates, thereby indicating promising prospects for safe in vivo utilization. This study offers a simple and rapid alternative for the fabrication of smart responsive microneedles, opening up new avenues in personalized and efficient transdermal drug delivery strategies.
Preparation and performance verification of calcium silicate composite electrical fireproof materials
Authors: Wang Yin , Wang Yu , Yang Dedong , Fu Guanggang , Zheng Chong , Kong Fanfang , Nie Jingkai , Ji Jun 
Published: August 2024

Abstract
The wall bushings of the converter transformer are often sealed with rock wool for fire prevention, but the fire resistance is not enough for hydrocarbon fire for 1 h, which leads to frequent fires in the converter station. In this paper, calcium silicate-bound vermiculite lightweight materials with a density of less than 900 kg/m3 were prepared by static hydrothermal autoclaving reaction with calcium silicate-rich powder as raw material, expanded vermiculite as aggregate, and fiber reinforced. The effect of material ratio on bulk density, strength, and high temperature resistance was discussed. The results show that the micropore structure developed in the binding phase is mainly composed of Tobe mullite and xonotlite, and the interlamellar pores between Tobe mullite and vermiculite contributed to the high porosity of the material. At the same time, the combination phase and vermiculite interpenetrating combination structure, so that the material has a high strength. Low shrinkage and low thermal conductivity characteristics of the composite under electric fire.
Performance analysis of motorized axles
Authors: Yan Yan , Hang Peng , Cao Liangqiang , Huang Tao , Duan Jingjing , Wu Yahu 
Published: August 2024

Abstract
As the electric wheel requires the integration of the hub motor and brake within the hub, the integration scheme and structural parameters of each component in the electric wheel play a crucial role in the coordination with the electric wheel and its running performance. The finite element analysis is conducted on the axle of the electric wheel to judge whether the structural parameters meet the performance requirements, providing a basis for the axle design of the electric wheel. This will have a decisive role in the safety performance and life of the car, effectively improving the working stability of the electric wheel.
Research on the failure mechanism of non-metallic oil pipeline flange
Authors: Weng Yu , Li Dejun , Jiang Shuxuan , Yang Shuang , Wu Gang , Deng Zhian 
Published: August 2024

Abstract
Fiberglass flanges are gradually being applied in oil field mixed transportation pipelines due to their advantages such as corrosion resistance and easy forming. However, at the same time, the anisotropy and local discontinuity are present in glass fiber components. Starting from the discovery of cracking, leakage, and other issues in the fiberglass flange of a certain oilfield sewage export pipeline, a combination of experimental research and numerical analysis is used to study the on-site fiberglass flange joint. Considering the internal pressure, bending moment, bolt load, and other loads in actual operating conditions, mechanical performance tests are conducted on the flange substrate, and the mechanical properties and damage conditions are obtained. A finite element model including pipeline gasket flange is constructed, and the flange damage under preloading, operation, external bending moment, and other operating conditions is analyzed based on the nonlinear Hashin failure criterion and the Tserpes sudden stiffness degradation model. It is found that bolt holes are more prone to large-scale failure damage due to stress concentration. As the external bending moment increases, it will simultaneously reduce the gasket compressive stress and cause flange surface failure and damage. According to research, it is recommended that the pre-tightening force of bolts during pipeline operation should not exceed 400000 N, and the bending moment generated by factors such as wind load and soil load should not exceed 200 N·m.
Analysis of isothermal elastohydrodynamic lubrication on the rough surface of a new type of trident universal joint
Authors: Xu Yutian , Yang Yan , Wang Guowei , Niu Jiahong 
Published: August 2024

Abstract
Taking the roughness into consideration, this chapter mainly studies the isothermal elastohydrodynamic lubrication between the slider and the balls in the new three-pronged universal joint and gives the relevant equations under isothermal conditions. The Reynolds equation is the primary tool for iteration, and Matlab is used for programming and plotting. In the simulation experiment, the roughness is given as 0. Then the amplitude and frequency of the roughness are varied to observe the oil film thickness and pressure respectively. With the increase of surface fluctuation, the film thickness in the center of the contact range becomes thicker, the pressure changes more and more sharply, and the peak value of secondary pressure is basically unchanged. As the frequency of the sinusoidal roughness increases, the film thickness in the center of the contact area becomes thinner as the frequency of roughness enhances, the fluctuations become more and more frequent, the pressure fluctuates around the original curve more and more often, and the amplitude becomes larger and larger.
Multi-material optimal design of miura origami folds based on genetic algorithm
Authors: Jiang Yahong , Zhou Jinyu , Xue Yaping , Hu Haotian 
Published: August 2024

Abstract
Based on the theoretical model of Miura origami, this paper uses Python and Abaqus software to optimize the design of multi-material positions at the crease of Miura origami by using a genetic algorithm. Firstly, the parametric modeling of Miura origami is carried out; then linear cell meshing is performed at the origami crease, and polylactic acid (PLA) and thermoplastic polyurethane (TPU) are selected as the optimized materials; finally, the multi-material position distribution is optimized by the genetic algorithm according to the target value, to search for the optimal distribution of the materials. Therefore, the angular displacement of the Miura origami model under the thermal drive meets the desired target value. This method solves the problem of finding the optimal multi-material distribution design under the target deformation and provides important ideas and references for the design of space expandable mechanisms simultaneously.
Effect of boundary layer thickness and dimensionless wall distance y+ on numerical simulation of heat pipes
Authors: Zhao Wenjie , Deng Jiajia , Xue Dawen , Xu Lin 
Published: August 2024

Abstract
To consider the sway of boundary layer thickness and dimensionless wall distance y+ on the numerical simulation results of the thermo tube, taking the straight thermo tube as an example, using the continuity equation, momentum equation, energy equation, and turbulence model equation as the controlling equations, and adopting the finite volume method for the spatial discretization, the numerical simulation study of the heat pipe is carried out by controlling the changes of boundary layer thickness and dimensionless wall distance y+. Numerical simulation studies show that the boundary layer thickness and y+ have a large effect on the numerical simulation of heat pipes. Reasonably setting these two parameters within a certain range can improve the accuracy of heat pipe numerical calculations, and the results of the study can provide a reference for the security analysis of thermo tube reaction vessels.
Influence of pre-tightening force on bearing capacity of composite cylinder
Authors: Yang Bo 
Published: August 2024

Abstract
For investigating the effect of preload on the bearing capacity of the composite hydrogen storage cylinders, the FEM of fiber full-wound aluminum liner cylinder is established by ABAQUS software. Stress calculation was carried out with and without preload. The results show that under working pressure, the application of pre-tightening pressure can cause the reduction of lining stress level and increase fiber layer stress, and the application of pre-tightening pressure can improve the stress distribution of the lining and fiber layer.
Study on the effect of permanent magnet guideway surface defect on the mechanical properties of multi-surface high-temperature superconducting permanent magnet levitation system with halbach-type guideway
Authors: Peng Jiahao , Zhao Xianfeng , Guo Yulong 
Published: August 2024

Abstract
The purpose of this study is to discuss the effect of defects on the mechanical properties of halbach-type guideway surfaces in high-temperature superconducting permanent magnetic levitation systems with single-surface superconductor distribution versus multi-surface superconductor distribution. The study models the high-temperature superconducting permanent magnetic levitation system based on Maxwell’s system of equations and compares it with the experimental data to obtain the variation curve of the levitation force of the levitation system under ideal conditions. Through numerical simulation and data analysis, it is found that the levitation force and guiding force of the high-temperature superconducting permanent magnetic levitation system will regularly decrease with the expansion of the defects, which will lead to the reduction of the system’s load-carrying capacity and stability. These findings are of great significance for the design and application of high-temperature superconducting magnetic levitation systems, and provide theoretical support and technical guidance for the practical application of high-temperature superconducting magnetic levitation systems.
Study on the influence of hole shapes on the fluid and mechanical properties of perforated honeycomb sandwich structures
Authors: Xiao Pengfei , Zhou Chunping , Luo Yunfeng 
Published: August 2024

Abstract
Due to the high load and heat transfer capacity, porous honeycomb sandwich structures are widely in engineering. However, in functional requirements, mass and heat transfer should be realized which results and perforated holes being applied in sandwich structures. The shape of the holes plays a crucial role in further improving the load-bearing and flow-resistance performance of the structure. In this study, the influence of hole shape on the flow resistance, permeability, and mechanical properties of perforated honeycomb sandwich structures are systematically studied. Five different hole shapes with the same area are considered, and the flow resistance, permeability, and maximum Mises stress of the perforated honeycomb sandwich structure under the five conditions are calculated. The results show that the hole shape does have a significant influence on the flow resistance, permeability, and mechanical properties of the structure, and especially, it is especially found that the circular structure has the lowest flow resistance and the rectangular structure has the highest load-bearing capacity.
Simulation and analysis for residual stresses in anode-supported flat-plate solid oxide fuel cells for ships
Authors: Li Zhaoqiang , Wang Lingling , Yang Haijun , Ji Wendong , Zhang Yushan , Lu Baocheng 
Published: August 2024

Abstract
For investigating the distribution of residual stress in marine SOFC, this paper establishes a two-dimensional axisymmetric model of a SOFC single cell to simulate the temperature change in the cell preparation process, and the results find that: The residual stresses in the cell are mainly concentrated at the bond where the anode support layer and the electrolyte layer combine. At the outermost intersection, there is a maximum stress of 184.43 MPa. Meanwhile, we analyze the interaction of component thickness parameters for residual stresses, and the simulation results show that: The largest first principal stress of the assembly shows a straight-line decreasing trend when the thickness of the anode support layer increases; However, in the same scenario for the electrolyte layer, the maximum stress increases rapidly in the beginning and then increases slowly until it does not increase anymore; There is no effect of the variation in thickness parameters for the cathode and isolation layers on the maximum first principal stress of the module.
Study on the relationship between reflectivity and thickness of radar-absorbing material
Authors: He Song , Hu Jun , Chen Jinsong , Xi Qiushi 
Published: August 2024

Abstract
Radar-absorbing materials (RAM) have been widely used in civilian areas for electromagnetic interference shielding and in the defense sector for radar wave stealth. The thickness of radar-absorbing materials is one of the important parameters affecting their performance. This paper analyzes the relationship between the absorbing performance of radar-absorbing materials and thickness based on transmission line theory. Through theoretical derivation and simulation verification, the concepts of optimal usage thickness and cutoff thickness of materials are derived. The research results have important guiding significance for the application and optimization design of radar-absorbing materials.
Study on the effect of polypropylene fiber shape and admixture on the mechanical properties of concrete
Authors: Li Jiuyang , Fan Xinmei , Zhu Yuepeng , Luo Jingwei , Wang Xiaoyu , Guo Jinpeng , Li Fan , Zhang Zicheng 
Published: August 2024

Abstract
The effect of three different shapes of PPF on the mechanical properties of concrete at different dosages was investigated. Cubic compressive ability test, split tensile ability test, and flexural ability test were conducted on polypropylene fiber concrete to analyze the effect of PPF on compressive ability, tensile compression ratio, and flexural compression ratio. The study shows that as the shape and admixture of polypropylene fibers have an impact on the compressive strength of concrete, monofilament-type polypropylene fibers will have the worst effect on the enhancement of the effect when the choice of a mixture of 0.90% of embossed polypropylene fibers on the role of the compressive ability of the concrete has the best effect. The concrete tensile compression ratio is mainly affected by the mixing amount of polypropylene fibers, and the main factors affect the concrete folding compression ratio of the polypropylene fibers of the shape of the main factors.
Stress analysis and calculation of the inner anchor structure of pressure-type anchor
Authors: Ma Jian , Zhang Qi , Dan Hanbo , Pan Feng , Xu Gang , Guo Yong , Lü Qing 
Published: August 2024

Abstract
The pressure-type anchor transfers the load to the grouting body via the inner anchor structure at its bottom when bearing the uplift loads. In order to design the inner anchor structure reasonably, the elastic thin plate theory is used to analyze the inner anchor structure under uniformly distributed loads. Based on material properties, the calculation method and the recommended values for the size parameters of the inner anchor structure are given. A finite element model of the inner anchor structure is established with which the rationality of the proposed method and the recommended parametric values are verified by analyzing the stress situation of the internal anchor structure under ultimate load.