bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of aging heat treatment at 180 °C on cavitation erosion for aluminum alloy type 5083 in cold rolled state
Authors: Micu L M , Bordeasu I , Dionisie I , Ghiban B , Gubencu D 
Published: July 2023

Abstract
Aluminum-based alloys have wide applicability in the construction of aircraft, vehicles, and ships. Some of their components, during operation, such as the radiators and the rotors of the cooling pumps in the vehicles, and the propellers of fishing and pleasure boats are affected by the abrasive, chemical and cavitational corrosive action of the water. At certain hydrodynamic flow regimes, the most dangerous becomes the corrosion through cavitation. Operation in such regimes inevitably leads to damaging the structure, due to cyclic stresses of the micro-jets and shock waves generated by the implosion of cavitation bubbles. Although the chemical constitution and alloying with other chemical elements increase the mechanical properties, the service life is still limited when operating in high-intensity cavitation flows. Therefore, researchers are looking for solutions to improve this resistance through various treatments, such as bulk heat. Research heading the same direction, but, made on 5083 alloy, is presented in this paper. The results highlight the behavior of a modified structure compared to the semi-fabricated state (obtained by rolling), through three durations regimes (one hours, 12 hours and 24 hours) of aging heat treatment to 180 °C temperature, after hardening treatment at 450 °C. The cavitation tests were performed in the Laboratory of the Polytechnic University of Timisoara, on the standard vibrating device with piezoceramic crystals. The results were expressed by curves and parameters specific to the evaluation of cavitation resistance, and by macro and microscopic images, showing the unique aspects of the connection between the structure and the mechanical properties obtained through heat treatment regimes. Thus, comparison of the results, including with the delivery state (laminated product), shows that the highest resistance is provided by the treatment at 24 hours. At the same time, the erosion, of pitting and caverns type, and differs from one structure to another.
X-ray analysis of welding parameters influence on pressure vessel steel P355 N
Authors: Cioroagă B D , Cioată V G 
Published: July 2023

Abstract
The paper presents a study on the influence of welding parameters that is done by radiographic interpretation of the X-ray analysis results collected from welded joins that had been realized by varying the welding current intensity, tension and welding speed. The base material of the experiment is a pressure vessel steel P355 N used for constructing railway tanks for transporting liquids by train. The welding method used is flux-cored arc welding, done by a semi-automatic welding machine using welding wire as joining material. The research aims to find connections between different material welding defects and the welding parameters involved in the process of flux-cored arc welding.
An overview of methods and technologies for the production of alternative diesel fuel from used engine oil
Authors: Raţiu S A , Armioni D M 
Published: July 2023

Abstract
In the context of global efforts to transition to a circular economy and minimize environmental pollution, various methods of waste management have been developed. Among them, used engine oil is a dangerous pollutant, but also a resource with high economic value. In this sense, superior recovery is aimed, either by recycling in order to obtain base oil or by producing alternative fuels, thus minimizing the consumption of natural resources and reducing the amount of improperly managed waste. This article’s purpose is to describe the main technological processes underlying the production of alternative diesel fuel from used engine oil. International industrially applied technologies that produce diesel fuel by treating used engine oil are also exemplified, and the main benefits of this process are described.
Experimental modeling of abrasive water-jet cutting processes of Kevlar fiber-reinforced polymer composites
Authors: Gubencu D V , Lazăr C O 
Published: July 2023

Abstract
In recent decades, the use of composite materials has spread widely in a variety of industries, from consumer goods to aeronautics and automotive. This trend is mainly explained by the functional properties of these materials, such as specific strength or specific stiffness, which make them suitable for structural applications.
Kevlar fiber-reinforced polymer composites are difficult to process using conventional methods, so non-traditional ones, like abrasive water jet machining became an alternative. This process has some advantages, such as the ability to cut complicated shape parts of different size and thickness, with high precision. However, the selection of operating parameters to provide a complete database, tailored to carry out efficient and effective processes, remains a challenge.
Due to the complexity of the phenomena in the workspace, analytical modeling of the process is difficult and has limited validity by the simplified hypotheses formulated previously. On the contrary, the models developed following empirical research have proved their importance in industrial practice, leading to the estimation of processing results, with high confidence levels.
Therefore, the experimental study was performed by applying design of experiments methods, in order to test the influence and to model the action of process parameters on the material removal rate of abrasive water jet cutting. The research also focused on the precision characteristics of the cut parts. Finally, the response surfaces and contour plots were represented, useful for identifying the sets of the process parameters that provide the required values for the objective functions investigated.
Multi-Parameter Damper Optimization of Cable-Stayed Bridge Considering Energy Dissipation
Authors: Liu Qi-yang , Geng Jiang-wei , Wang Yang , Ge Yong , Bao Qi 
Published: July 2023

Abstract
The parameters optimization of a viscous damper is carried out with a cable-stayed bridge with a single cable plane and a single tower. Based on five optimization parameters and four optimization functions of damper energy dissipation and structure, the relationship between each function and damper parameters is obtained. Finally, the spatial distribution surface of the multi-parameter objective optimization function is constructed, and the final optimization result is obtained. The optimization process shows that the reasonable viscous damper parameters can effectively inhibit the vibration and structural response of the bridge under seismic excitation. At the same time, the single control target optimization function may result in non-convergence, and the optimization value cannot be obtained. The multi-parameter objective optimization function introduced considering the energy dissipation of the damper can effectively avoid this shortcoming and finally obtain reasonable damper optimization parameters.
Numerical Simulation of Welding Temperature Field, Stress Field, and Strain Field of Fillet Joint in Different Welding Sequence
Authors: Ye Zhongzhao , Liu Jianchun , Xie Chuanlu , Zhang Shijie 
Published: July 2023

Abstract
For welding temperature field, stress field, and strain field in fillet joints, using the double ellipsoid heat source, the ABAQUS software platform is used to simulate and analyze the welding process of fillet joints with four different application sequences. By setting up observation points, the study analyzed the distribution of the temperature field, stress field, and strain field of the simulated welding process for these four application cases. The results show that in the vertical weld direction, the welding sequence has a large effect on the transverse residual stress; the use of isotropic welding, butt weld first and then welded fillet weld program, the maximum total deformation and angular deformation produced are the smallest.
Strength Research Based on ABAQUS for the Fixed Plate of the Refrigerator Compressor
Authors: Xu Chen-yu , Zhang De-hai , Guo Dong-jie , Li Yan-qin , Guo Da-yong 
Published: July 2023

Abstract
The compressor fixed plate in the refrigerator plays an important role in carrying the compressor and connecting various parts, which is very important to the structure of the refrigerator. In this paper, the finite element (FE) software ABAQUS is used to check the strength of the compressor base plate of thicknesses of 1.2 mm and 1.5 mm. Firstly, the model establishment and mesh treatment method of the fixed plate of the refrigerator compressor is introduced, then the load and constraints are described. Finally, the FE analysis is carried out, and the plates of 1.2 mm and 1.5 mm thicknesses are contrasted, respectively. And the stress-strain diagrams are obtained, which provide a theoretical basis for the design and optimization of the compressor fixed plate.
Bimodular Microbeams Based on the Elastic Foundation: Free Vibration
Authors: Huang Chunlin , Peng Jianshe , Lin Fan , Yang Liu 
Published: July 2023

Abstract
The paper uses the modified couple stress theory to study the free vibration model of bimodular microbeams with an elastic foundation. Microbeams behave differently in the tension and compression zones due to the bimodular property, and the neutral layer depends on the sign of the bending moment. By figuring out the effective strain formula and applying Hamilton’s principle, the governing equation for free vibration can then be derived. The equation takes into account the size effect, the foundation parameters, and the bimodular property’s effects. Using the differential quadrature method, it is examined how the foundation parameters and the material length scale parameters affect free vibration. The findings indicate that frequency increases as parameter size increases.
Simulation Analysis of Rubber Material Constitutive Model based on Ansys
Authors: Suo Haoliang , Li Guanfeng , Qin Aizhong , Chen Zhuoyuan 
Published: July 2023

Abstract
Rubber material has a wide range of applications in engineering design because of its unique polymer material properties. Under the action of load, the corresponding relationship between stress and strain is nonlinear, so it is very difficult to make mechanical analysis and material selection in engineering applications. This paper takes butyl rubber as the research object, which obtains stress-strain data through uniaxial compression tests at different strain rates, fits material parameters through MATLAB according to three commonly used hyper-elastic constitutive models, and carries out static finite element simulation analysis based on Ansys. The analysis results are compared with the test results, to verify the practicability and accuracy of the constitutive model and provide a reference for engineering applications.
Study on the effect and mechanism of NaOH on the modification of fluorapatite: A new method of preparing fluor-hydroxyapatite
Authors: Han Huili , Yin Wanzhong , Wang Yulian , Sun Haoran , Sun Xinglong , Cao Bin 
Published: July 2023

Abstract
Fluorapatite (FA) and fluor-hydroxyapatite (FHA) have good biocompatibility to substitute for human hard tissue, whereas FA has more cytotoxic and genotoxic effects than FHA. In this study, a new method named nitric acid dissolution-recrystallization was proposed to achieve the modification of FA, and NaOH was used to introduce OH- into FA to prepare FHA in the recrystallization process. The effect and mechanism of NaOH/pH value on the modification of FA were investigated using XRD analysis, SEM detection, EDTA complexometric titration, and FT-IR measurements. XRD and SEM analyses indicated that the synthesized FHA at the pH value of 8.00 had the highest crystallinity and the largest crystal size, reaching 38.10 nm, and the crystal was in the form of short rods with a length of about 1 μm. It was found that the content of the F element in the synthesized FHA decreased as the pH value of the reaction system increased. When the pH value reached 8.00, the content of F was 0.60%, and the values of x and (2-x) in FHA [Ca10(PO4)6Fx(OH)2-x] were 0.16 and 1.84, respectively. FT-IR analysis further confirmed that the content of OH- in FHA obtained at the pH value of 8.00 was noticeably higher than that obtained at the pH value of 4.46. This work could provide a new prospect for utilizing FA to prepare FHA and be of great significance.
A new biodegradable modified PVA/AZP and PCL composite scaffold for bone repair
Authors: Chen Jinqing , Huangfu Shuxian , Huang Caihao , Yu Xiaoming 
Published: July 2023

Abstract
The regeneration and repair of bone defects require implanting artificial bone materials with excellent mechanical and biological properties similar to human bones. However, the compressive strength and bioactivities of 3D printing biodegradable materials like PVA are usually not enough for weight-bearing bone defect repair. In this study, we added AZP (amorphous zinc phosphate) nanoparticles to increase the biological properties of PVA 3D printing scaffolds and filled PCL into PVA scaffolds to improve the mechanical properties. Our results revealed that the size of AZP nanoparticles was about 63.5 ± 29.3 nm, and PVA/AZP scaffold was printed with a pore size of 600 μm. The cell experiments showed that PVA scaffolds compounded with AZP nanoparticles can effectively promote cell proliferation. Therefore, the AZP nanoparticles have good biocompatibility, and the scaffold with AZP nanoparticles has the prospect of application in bone tissue engineering.
Surface stretch forming process based on collaborative control of sheet metal deformation and die contact state
Authors: Yang Zhen , Qian Cheng , Liu Yuezhou , Li Fengtao , Wang Yuxi , Du Chengcheng 
Published: July 2023

Abstract
In this study, we propose a novel method of surface stretch forming, named the Surface Stretch Forming based on Collaborative Control of Sheet Metal Deformation and Die Contact State (SF-CCDC). By controlling the motion paths of the discrete clamps, the contact process with the die, and the deformation process of the sheet metal can be changed. The processes of conventional stretch forming (SF-C) and SF-CCDC were numerically simulated. The results show that in SF-CCDC, the shearing effect of the die edge on the sheet metal can be reduced through the collaborative control of sheet metal deformation and contact with the die. Compared to SF-C, the maximum thinning rate is reduced by 50%, and the risk of stretch cracking is lower in SF-CCDC. Furthermore, both the center and edge areas of the sheet make contact with the die simultaneously, ensuring adequate deformation constraints and preventing wrinkling defects. Experiments were conducted to demonstrate the reliability and adaptability of the SF-CCDC method for forming double-curved surfaces.
A process optimization of multi-pass multi-layer laser deposition with 316 L stainless steel wire
Authors: Luo Yuanqing , Yan Fei , Chen Chaoda 
Published: July 2023

Abstract
In this paper, the laser metal-wire deposition (LMwD) process of 316 L stainless steel was optimized through a series of systematical experiments. In the orthogonal experiment, the influence of laser power, scanning speed, and wire feed speed on average thin wall thickness (w), the standard deviation of thin wall thickness (δ), average layer height (h), and standard deviation of layer height (α) was investigated. Additionally, several experiments were conducted to determine multi-pass overlap rates affecting the forming precision which could generate an appropriate product at the highest scanning speed possible for each laser power. The result indicates that the laser power and scanning speed are the main factors affecting forming precisions of deposited samples, while the overlap rate of deposited samples can determine forming precisions. Based on the optimized parameters, a deposition product with a gold surface and high deposition quality was successfully achieved.
Performance study of CrN coatings prepared by DC magnetron sputtering
Authors: Yang Erqi , Liu He , Zhang Gang 
Published: July 2023

Abstract
Cutting edge declaration strategies and the progression of advanced troublesome coating materials are fundamental for the making of high-quality mechanical components. The point of this work is to induce prepared CrN coatings by magnetron sputtering at unmistakable nitrogen stream rates and to look at the effect of moving nitrogen stream rates on the composition, film thickness and mechanical properties of the gotten chromium nitride coatings. The outcomes appear that the nitrogen stream rate impacts the sputtering rate of the coating, i.e. the affirmation rate diminishes as the degree of nitrogen interior the plasma increments. In expansion, as the nitrogen stream rate increments, the grain gage of the coating diminishes, and the hardness modulus of the coating increments. Flexibility data illustrate that extending the N2 stream rate increases the wear resistance and flexibility of the coating.
Adjustment of the Coarse Grain Problem of the Horizontal Continuous Casting Slab by Optimizing the Crystallizer Structure
Authors: Liu Jinsong , Zhang Liangli , Wang Songwei 
Published: July 2023

Abstract
This paper mainly focuses on the problem of coarse grain on the bottom surface of the red copper horizontal continuous casting billet, and tries to thicken the bottom end of the crystallizer by combining numerical simulation and industrial experiment, and indirectly improves the cooling strength of the bottom surface of the casting billet to solve the problem of grain coarseness. The results show that the optimum diameter of the lower inlet of the copper sleeve was 14.2 mm, when the diameter of the inlet increased from 11 mm to 14.2 mm, the cooling intensity of the lower part of the casting billet gradually increased, and the grain on the lower surface was significantly refined; and with the increase of the diameter of the water inlet, the average width of the columnar grain decreased from 1.94 mm to 1.64 mm, the grain size decreased, and the number of grains increased.
The Effect of Temperature on Electrochemical Corrosion Behavior of HDR Duplex Stainless Steel
Authors: Lin Yufeng , Wang Xiaoqiang , Li Zhuying , Zhang Xiaodong 
Published: July 2023

Abstract
To study the effect of temperature on the electrochemical corrosion behavior of HDR duplex stainless steel, the corrosion resistance of HDR at different temperatures was investigated using the electrochemical test method and combined with metallographic microstructure observation and the EDS analysis based on the characteristic that the metal structure determines. The results show that the HDR contains inclusions such as silicide and nitride, mainly distributed in the ferrite phase and its boundary. The pitting of HDR occurs when the polarization potential of -0.5–1.5 V is applied at different temperatures ranging from 10 °C to 80 °C. The pitting occurs mainly in the ferrite and its boundary below 50 °C and in the austenite and ferrite tissues above 60 °C. Cl−, inclusions, and Cr oxides are the important factors affecting corrosion. The corrosion rate of HDR increases with the increase in temperature; the higher the temperature is, the more serious the corrosion is. The critical pitting temperature of HDR is between 50 °C and 60 °C. The pitting potential below 50 °C is above 0.65 V, while that above 60 °C is below 0.60 V.
Oxidation and Corrosion Resistance of Graphene-modified Silicon Oxide Coating
Authors: Liu Zitong , Xiao Xuan , Wu Yunsheng 
Published: July 2023

Abstract
The thermal corrosion resistance of nickel-based GH4413 alloy at the service temperature of 660 °C and the oxidation behavior at 600–700 °C after graphene modified silicon coating were studied. The morphologies and types of corrosion and oxidation products after thermal salt corrosion and constant temperature oxidation were analyzed by scanning electron microscopy, energy spectrum, X-ray diffraction, and X-ray photo electron spectroscopy. The resistance of thermal corrosion and oxidation of graphene-modified silicon coating was evaluated. The results show that compared with the uncoated sample, the weight loss during thermal corrosion of the coated sample at 660 °C is lower than that of the uncoated sample. The coating partially peels off after salt corrosion up to 500 h at 660 °C. The O element diffuses into the matrix to form fine oxides, and the coating still plays a protective role on the matrix. After oxidation at 600–700 °C to 3000 h, the dense layer of Al2O3 and TiO2 and a small amount of Cr2O3 appear at the interface between the coating and the matrix without loose harmful oxidation product. The addition of graphene reduces the chemical activity of the silicon coating and makes the coating denser. Therefore, the GH4413 alloy after the graphene-modified coating has excellent resistance to thermal corrosion and oxidation at its service temperature.
Thermal deformation behavior and constitutive model of 42CrMo4 steel
Authors: Zhang Yu , Zhao Hui , Liu Pengke , Wei Menghan , Gong Xun , Liu Zhanqi 
Published: July 2023

Abstract
42CrMo4 steel is a widely used high-strength alloy steel in various large-bearing manufacturing fields. The rheological stress curve of 42CrMo4 steel with the best heat treatment scheme was obtained through the thermal compression experiment. A mathematical model was established using the hyperbolic sine function to relate deformation temperature, strain rate, and flow stress during thermoplastic deformation. The flow stress curves of 42CrMo4 alloy steel show typical dynamic recovery and recrystallization characteristics.
Microstructure and Mechanical Properties of Multi-principal component FeCoCrNiMox High Entropy Alloy
Authors: Wei Menghan , Zhao Hui , Zhang Yu , Gong Xun , Liu Pengke , Li Mei 
Published: July 2023

Abstract
High entropy alloy is considered a kind of structural and functional materials with wide application prospects. In the present work, FeCrCoNiMox was prepared and used as a research object. The influence of Mo with a large atomic radius on crystal structure, microstructure, and mechanical properties was discussed and the variation of microstructure and properties with composition was clarified. The microstructure of the alloy changes gradually from single phase FCC centered cubic solid solution structure to FCC + σ phase and FCC + σ + μ phase with increasing Mo content. The microstructure of FeCrCoNiMox also gradually changes from uniaxial crystal to dendrite and the hardness of FeCrCoNiMox changes with the change of FeCrCoNiMox microstructure. FeCrCoNiMo0.6 alloy has the highest hardness, reaching 375 HV.
Research on Photoelectric Properties of ZnO-based Semiconductor Material
Authors: Shu Xinpeng 
Published: July 2023

Abstract
In recent years, many semiconductor materials have been applied to the photocatalysis technology. As a semiconductor with wide band gap (3.37 eV), ZnO has received extensive attention in the photocatalytic degradation of organic pollutants due to its rich morphology, low cost and other advantages. However, due to the wide band gap of ZnO, it can only absorb ultraviolet light (accounting for about 4% of the whole solar spectrum), which has greatly limited the application of ZnO semiconductor materials. BiOI/ZnO binary complexes were synthesized by simple hydrothermal and solvothermal methods. Their phenol degradation activities were tested under different light sources. The mechanism of photocatalytic degradation of phenol was reasonably explained by free radical trapping experiment, surface photovoltage, transient photovoltage, fluorescence and other tests.