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学者姓名：林有希
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Abstract ：
为了深入研究ADC12铝合金高速铣削中刀具前刀面磨损行为，采用细晶粒硬质合金刀片进行铣削试验，研究了不同切削速度和切削长度下的切削力变化规律以及对刀具磨损的影响，提出两种前刀面黏结程度评价方法，通过刀具磨损形貌观察及表面化学元素分析，探讨了前刀面的磨损形式，深入剖析了黏结磨损机理。结果表明：切削速度为600m/min时，刀具前刀面黏结最为严重，Al元素含量约为67.61%,这与该速度下切削力较大有关；采用黏结面积法发现，切削速度为600m/min时的刀具前刀面黏结面积同样达到最大，约为0.01286mm~2;在刀具和工件材料接触区域，由于热—力耦合冲击产生黏结磨损，并在磨粒磨损共同作用下出现月牙洼磨损。
Keyword ：
ADC12铝合金 ADC12铝合金 切削速度 切削速度 磨损形式 磨损形式 磨损机理 磨损机理 铣削力 铣削力
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| GB/T 7714 | 禹杰 , 米少伟 , 林有希 . ADC12铝合金高速铣削前刀面磨损机理研究 [J]. | 工具技术 , 2024 , 58 (01) : 42-48 . |
| MLA | 禹杰 等. "ADC12铝合金高速铣削前刀面磨损机理研究" . | 工具技术 58 . 01 (2024) : 42-48 . |
| APA | 禹杰 , 米少伟 , 林有希 . ADC12铝合金高速铣削前刀面磨损机理研究 . | 工具技术 , 2024 , 58 (01) , 42-48 . |
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Copper particles emitted from braking have become a significant source of environmental pollution. However, copper plays a crucial role in resin-based braking materials. Developing high-performance braking materials without copper has become a significant challenge. In this paper, the resin-based braking materials were filled with fly-ash cenospheres to develop copper-free braking materials. The effects of fly-ash cenospheres on the physical properties, mechanical and friction and wear properties of braking materials were studied. Furthermore, the wear mechanism of copper-free resin-based braking materials filled with fly-ash cenospheres was discussed. The results indicate that the inclusion of fly-ash cenospheres in the braking materials improved their thermal stability, hardness and impact strength, reduced their density, effectively increased the friction coefficient at medium and high temperatures, and enhanced the heat-fade resistance of the braking materials. The inclusion of fly-ash cenospheres contributed to the formation of surface friction film during the friction process of the braking materials, and facilitated the transition of form from abrasive wear to adhesive wear. At 100-350 celcius, the friction coefficient of the optimal formulation is in the range of 0.57-0.61, and the wear rate is in the range (0.29-0.65) x 10-7 cm3 center dot N-1 center dot m-1, demonstrating excellent resistance to heat-fade and stability in friction coefficient. This research proposes the use of fly-ash cenospheres as a substitute for environmentally harmful and expensive copper in brake materials, which not only improves the performance of braking materials but also reduces their costs.
Keyword ：
Braking materials Braking materials Fly-ash cenospheres Fly-ash cenospheres Friction and wear Friction and wear Heat-fade resistance Heat-fade resistance Wear form Wear form
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| GB/T 7714 | Zheng, Kaikui , Lin, Youxi , You, Shanmin et al. Copper-Free Resin-Based Braking Materials: A New Approach for Substituting Copper with Fly-Ash Cenospheres in Composites [J]. | CHINESE JOURNAL OF MECHANICAL ENGINEERING , 2024 , 37 (1) . |
| MLA | Zheng, Kaikui et al. "Copper-Free Resin-Based Braking Materials: A New Approach for Substituting Copper with Fly-Ash Cenospheres in Composites" . | CHINESE JOURNAL OF MECHANICAL ENGINEERING 37 . 1 (2024) . |
| APA | Zheng, Kaikui , Lin, Youxi , You, Shanmin , Ren, Zhiying , Huang, Jianmeng . Copper-Free Resin-Based Braking Materials: A New Approach for Substituting Copper with Fly-Ash Cenospheres in Composites . | CHINESE JOURNAL OF MECHANICAL ENGINEERING , 2024 , 37 (1) . |
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Nickel-aluminum bronze alloys are prone to tool surface bonding and wear on the tool substrate during the cutting process. The correlation between tool surface bonding morphology, rear face wear, and cutting force is analyzed in terms of the dry turning method for cutting 9442-nickel-aluminum bronze. The rational cutting parameters and the mechanism of tool wear are further discussed. The results indicate that adhesion, oxidation, and abrasive wear occur on the tool surface during turning. At a turning length of 2000 m, tool wear increases with increasing cutting speed and feed. There is a tool wear difference of 2 to 3 mu m between adjacent cutting parameters, but the wear is similar at cutting speeds of 140 and 180 m/min. By appropriately reducing the cutting speed and feed rate, it is possible to promote the formation of an adhering layer on the rear face of the tool, thereby reducing overall tool wear. The best cutting results are achieved at a chip speed of 100 m/min and a feed rate of 0.05 mm/rev. However, at higher cutting speeds, there is susceptibility to the "bonding-flaking" phenomenon where material adheres to the tool surface, leading to fluctuations in cutting forces and accelerated tool wear. Higher feed rates result in increased cutting forces, which hinder the formation of an adhering layer on the rear face, causing severe wear on the tool matrix.
Keyword ：
bonding-flaking bonding-flaking cutting forces cutting forces nickel-aluminum bronze alloy nickel-aluminum bronze alloy tool wear tool wear tool wear mechanisms tool wear mechanisms
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| GB/T 7714 | Zou, Weiqiang , Lai, Fuqiang , Yi, Dongdong et al. Variation of Cutting Forces with Different Cutting Parameters and Tool Wear during Turning of 9442-Nickel-Aluminum Bronze [J]. | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2024 . |
| MLA | Zou, Weiqiang et al. "Variation of Cutting Forces with Different Cutting Parameters and Tool Wear during Turning of 9442-Nickel-Aluminum Bronze" . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE (2024) . |
| APA | Zou, Weiqiang , Lai, Fuqiang , Yi, Dongdong , Lin, Youxi . Variation of Cutting Forces with Different Cutting Parameters and Tool Wear during Turning of 9442-Nickel-Aluminum Bronze . | JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE , 2024 . |
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The purpose of this paper is to investigate the fatigue properties of C17200 alloy under the condition of quenching aging heat treatment at high temperatures, and to provide a design reference for its application in a certain temperature range. For this purpose, the tensile and rotary bending fatigue (RBF) tests were carried out at different temperatures (25 degrees C, 150 degrees C, 350 degrees C, and 450 degrees C). The tensile strength was obtained, and relationships between the applied bending stress levels and the number of fatigue fracture cycles were fitted to the stress-life (S-N) curves, and the related equations were determined. The fractured surfaces were observed and analyzed by a scanning electron microscopy (SEM). The results show that the RBF fatigue performance of C17200 alloy specimens is decreased with the increase in test temperature. When the temperature is below 350 degrees C, the performance degradation amplitudes of mechanical properties and RBF fatigue resistance are at a low level. However, compared to the RBF fatigue strength of 1 x 10(7) cycles at 25 degrees C, it is decreased by 38.4% when the temperature reaches 450 degrees C. It is found that the fatigue failure type of C17200 alloy belongs to surface defect initiation. Below 350 degrees C, the surface roughness of the fatigue fracture is higher, which is similar to the brittle fracture, so the boundary of the fracture regions is not obvious. At 450 degrees C, due to the further increase in temperature, oxidation occurs on the fracture surface, and the boundary of typical fatigue zone is obvious.
Keyword ：
beryllium copper alloy beryllium copper alloy elevated temperatures elevated temperatures fatigue strength fatigue strength performance degradation performance degradation rotating bending fatigue rotating bending fatigue
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| GB/T 7714 | Lai, Fuqiang , Mao, Kun , Cao, Changsheng et al. Rotating Bending Fatigue Behaviors of C17200 Beryllium Copper Alloy at High Temperatures [J]. | MATERIALS , 2023 , 16 (2) . |
| MLA | Lai, Fuqiang et al. "Rotating Bending Fatigue Behaviors of C17200 Beryllium Copper Alloy at High Temperatures" . | MATERIALS 16 . 2 (2023) . |
| APA | Lai, Fuqiang , Mao, Kun , Cao, Changsheng , Hu, Anqiong , Tu, Junxiang , Lin, Youxi . Rotating Bending Fatigue Behaviors of C17200 Beryllium Copper Alloy at High Temperatures . | MATERIALS , 2023 , 16 (2) . |
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In this paper, the responses of machined surface roughness and milling tool cutting forces under the different milling processing parameters (cutting speed v, feed rate f, and axial cutting depth a(p)) are experimentally investigated to meet the increasing requirements for the mechanical machining of T2 pure copper. The effects of different milling processing parameters on cutting force and tool displacement acceleration are studied based on orthogonal and single-factor milling experiments. The three-dimensional morphologies of the workpieces are observed, and a white-light topography instrument measures the surface roughness. The results show that the degree of influence on S-a (surface arithmetic mean deviation) and S-q (surface root mean square deviation) from high to low level is the v, the f, and the a(p). When v = 600 m/min, a(p) = 0.5 mm, f = 0.1 mm/r, S-a and S-q are 1.80 mu m and 2.25 mu m, respectively. The cutting forces in the three directions negatively correlate with increased cutting speed; when v = 600 m/min, F-x reaches its lowest value. In contrast, an increase in the feed rate and the axial cutting depth significantly increases F-x. The tool displacement acceleration amplitudes demonstrate a positive relationship. Variation of the tool displacement acceleration states leads to the different microstructure of the machined surfaces. Therefore, selecting the appropriate milling processing parameters has a positive effect on reducing the tool displacement acceleration, improving the machined surface quality of T2 pure copper, and extending the tool's life. The optimal milling processing parameters in this paper are the v = 600 m/min, a(p) = 0.5 mm, and f = 0.1 mm/r.
Keyword ：
cutting force cutting force machining parameters optimization machining parameters optimization surface roughness surface roughness T2 pure copper T2 pure copper tool displacement acceleration tool displacement acceleration
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| GB/T 7714 | Lai, Fuqiang , Hu, Anqiong , Mao, Kun et al. Effect of Milling Processing Parameters on the Surface Roughness and Tool Cutting Forces of T2 Pure Copper [J]. | MICROMACHINES , 2023 , 14 (1) . |
| MLA | Lai, Fuqiang et al. "Effect of Milling Processing Parameters on the Surface Roughness and Tool Cutting Forces of T2 Pure Copper" . | MICROMACHINES 14 . 1 (2023) . |
| APA | Lai, Fuqiang , Hu, Anqiong , Mao, Kun , Wu, Zhangbin , Lin, Youxi . Effect of Milling Processing Parameters on the Surface Roughness and Tool Cutting Forces of T2 Pure Copper . | MICROMACHINES , 2023 , 14 (1) . |
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Smart surfaces with responsive wettability are unstable, and depend upon continuous external stimuli, which limits their widespread application in switchable oil/water emulsions separations. In this study, a Ti-based 3D porous structure (SLM-3DTi) is printed using advanced selective laser melting (SLM) technology for the switchable separation of oil/water emulsion. With the assistance of the computer program, porous structure and re-entrant texture can be easily designed and printed in one step. Without any continuous external stimulus, the wettability of SLM-3DTi can be reversibly switched between underwater superoleophobicity and underoil superhydrophobicity simply by drying and washing cycles. The SLM-3DTi achieves switchable surfactant-stabilized oil-in-water emulsion (SSE(o/w)) and surfactants-stabilized water-in-oil emulsion (SSE(w/o)) separation with purity above 99.8% at a flux of more than 2000 L m(-2) h(-1). In addition, the re-entrant texture of the SLM-3DTi surface is formed with the partially melting powder particles on the part contour, which has much stronger mechanical durability than any binder. Furthermore, SLM-3DTi has excellent corrosion resistance due to the material properties of Ti. More importantly, based on the visualization analysis of the simulation, the mechanism of SLM-3DTi emulsion separation is further elucidated. Therefore, SLM-3DTi has broad practical application potential for high-flux, high-purity, and switchable oil/water emulsion separation.
Keyword ：
3D porous structures 3D porous structures durability durability emulsion separation emulsion separation SLM SLM switchable wettability switchable wettability
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| GB/T 7714 | Yang, Yu , Ren, Zhiying , Zhou, Chunhui et al. 3D-Printed Robust Dual Superlyophobic Ti-Based Porous Structure for Switchable Oil/Water Emulsion Separations [J]. | ADVANCED FUNCTIONAL MATERIALS , 2023 , 33 (15) . |
| MLA | Yang, Yu et al. "3D-Printed Robust Dual Superlyophobic Ti-Based Porous Structure for Switchable Oil/Water Emulsion Separations" . | ADVANCED FUNCTIONAL MATERIALS 33 . 15 (2023) . |
| APA | Yang, Yu , Ren, Zhiying , Zhou, Chunhui , Lin, Youxi , Hou, Linxi , Shi, Linwei et al. 3D-Printed Robust Dual Superlyophobic Ti-Based Porous Structure for Switchable Oil/Water Emulsion Separations . | ADVANCED FUNCTIONAL MATERIALS , 2023 , 33 (15) . |
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Superhydrophobic materials have been extensively investigated for their ability to separate oil/water mixtures, but their fragile durability has limited further development in this field. In this study, a durable superhydrophobic wire-cotton-based material (SWCM) was prepared by weaving metal wire and cotton fiber and modifying it with a mixed poly(vinyl phenol) (PVPh)/1,3-phenylene bisoxazoline (PBO) solution, which exhibits both macro-frame and micro-aperture. The SWCM demonstrates remarkable separation efficiency (greater than99.98 %) for a variety of water-in-oil emulsions using only gravity drive. More importantly, computational fluid dynamics (CFD) simulations were conducted to investigate the separation mechanism of SWCM, revealing dynamic trajectory and volume changes of water droplets in real-time. Moreover, the micro-aperture, protected by the macro-frame, can withstand hundreds of impacts and abrasions and still maintain reliable separation efficiency. Under the encapsulation of micro-apertures, the macro-frame exhibits excellent corrosion resistance and can maintain stable superhydrophobicity even after long-term immersion in different harsh solutions. Due to its excellent durability, the SWCM can maintain a long service life in oil-water separation in complex environments. Therefore, the presented SWCM has great potential in the development of durable and efficient materials for emulsion separation.
Keyword ：
CFD simulation CFD simulation Durability Durability Emulsion separation Emulsion separation Superhydrophobic Superhydrophobic Wear resistance Wear resistance
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| GB/T 7714 | Yang, Yu , Ren, Zhiying , Chen, Weiping et al. Superhydrophobic wire-cotton woven porous material with excellent durability for emulsion separation [J]. | SEPARATION AND PURIFICATION TECHNOLOGY , 2023 , 320 . |
| MLA | Yang, Yu et al. "Superhydrophobic wire-cotton woven porous material with excellent durability for emulsion separation" . | SEPARATION AND PURIFICATION TECHNOLOGY 320 (2023) . |
| APA | Yang, Yu , Ren, Zhiying , Chen, Weiping , Fan, Mingzhi , Lin, Youxi , Guo, Zhiguang . Superhydrophobic wire-cotton woven porous material with excellent durability for emulsion separation . | SEPARATION AND PURIFICATION TECHNOLOGY , 2023 , 320 . |
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Metal rubber (MR) is a kind of porous and highly elastic pure metal damping material, but its strong nonlinear hysteresis characteristics are the main factors limiting its engineering applica-tion. In this paper, a high-order nonlinear friction (HNF) model was proposed for the first time according to the inclination angle and contact form of the spatial distribution of metal wires in MR. At the same time, combined with nonlinear elastic restoring force, nonlinear damping force, and coulomb hysteresis friction force, a general hysteresis dynamic model of MR was constructed. In order to verify the accuracy of the model, three kinds of MR with different densities were prepared and tested. The results show that the HNF hysteresis dynamic model has a very high prediction accuracy (R2 = 0.9999) and a high signal-to-noise ratio (SNR > 700). The hyster-esis curve of the HNF hysteresis dynamic model was highly consistent with the experimental hysteresis curve, while the accuracy and versatility of the traditional dynamic model decreased with the change of density. It is because the HNF term includes the influence factors that can characterize the contact form of the metal wire inside MR and the material properties. These influence factors will be adjusted in real-time to reduce the error of the model according to the changes in the preparation process parameters or material properties. Therefore, the HNF hys-teresis dynamic model could effectively demonstrate the nonlinear hysteresis characteristics of MR and had the adaptive ability to change process parameters. This paper provided a new theoretical model for the dynamic system of MR materials with a complex network structure.
Keyword ：
Dynamic modeling Dynamic modeling High -order nonlinear friction (HNF) High -order nonlinear friction (HNF) Metal Rubber Metal Rubber Parameter Identification Parameter Identification
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| GB/T 7714 | Zhou, Chunhui , Ren, Zhiying , Lin, Youxi et al. Hysteresis dynamic model of metal rubber based on higher-order nonlinear friction (HNF) [J]. | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2023 , 189 . |
| MLA | Zhou, Chunhui et al. "Hysteresis dynamic model of metal rubber based on higher-order nonlinear friction (HNF)" . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING 189 (2023) . |
| APA | Zhou, Chunhui , Ren, Zhiying , Lin, Youxi , Huang, Zihao , Shi, Linwei , Yang, Yu et al. Hysteresis dynamic model of metal rubber based on higher-order nonlinear friction (HNF) . | MECHANICAL SYSTEMS AND SIGNAL PROCESSING , 2023 , 189 . |
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为了满足高精密铍铜件表面的加工要求，研究刀具表面黏附过程对切削系统和已加工表面的影响，有利于提高加工质量和加工效率。通过建立二自由度切削颤振系统，结合工件材料特性、黏结过程和断续切削过程，采用单因素高速铣削实验方法，解析刀具损伤、切削颤振和已加工表面的内在联系，并通过电镜扫描和白光干涉对刀具表面和已加工表面进行对比分析。切削速度和黏附程度的差异性，极大地影响了切削过程的稳定性，导致已加工表面缺陷的产生。不同黏附环境往往导致了不同的切削状态，尤其是高黏附率环境下的刀具表面黏附有利于维持切削刃形态和减缓加工颤振现象。
Keyword ：
切削颤振 切削颤振 加工质量 加工质量 稳定性 稳定性 表面黏附 表面黏附 高速铣削 高速铣削
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| GB/T 7714 | 禹杰 , 刘添亿 , 林有希 . 铍铜合金铣削过程刀具黏附现象对切削颤振影响分析 [J]. | 机床与液压 , 2023 , 51 (07) : 26-33 . |
| MLA | 禹杰 et al. "铍铜合金铣削过程刀具黏附现象对切削颤振影响分析" . | 机床与液压 51 . 07 (2023) : 26-33 . |
| APA | 禹杰 , 刘添亿 , 林有希 . 铍铜合金铣削过程刀具黏附现象对切削颤振影响分析 . | 机床与液压 , 2023 , 51 (07) , 26-33 . |
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Graphene aerogels possess unique advantages for treating oil-water mixtures, but their fragile mechanical properties hinder further development, and their separation mechanisms remain unclear. Herein, a superhydrophobic silane-crosslinked graphene oxide/polyvinyl alcohol aerogel (Si-GPA) was prepared by directional freeze-drying of a graphene oxide/polyvinyl alcohol (GO/PVA) suspension and vapor-phase deposition of methyltriethoxysilane (MTES) for efficient on-demand oil-water separation, and its separation mechanism was revealed through computational fluid dynamics (CFD) simulations. With the binding of PVA polymer chains and the cross-linking of MTES monomers, the Si-GPA exhibits excellent anisotropy, radial superelasticity (over 50 000 cycles at 50% strain), and axial superstiffness (freezing direction) (more than 20 000 times its own weight), which are the best-known results to date. The Si-GPA utilizes its superelasticity to adsorb floating oil on the sea surface and oil droplets in oil-in-water emulsions, while employing its superstiffness to filter water-in-oil emulsions in pipelines for on-demand oil-water separation. More importantly, the Si-GPA overcomes the trade-off between flux and efficiency, enabling the separation of water-in-oil emulsions with water droplet sizes several times smaller than its pore size under gravity alone, and with ultra-high flux (4350 L m-2 h-2) and ultra-high purity (99.9%), 1-2 times higher than those of 2D superwetting separation membranes that require external pressure. Additionally, visualization analysis based on simulation modeling reveals the emulsion coalescence filtration mechanism of the Si-GPA. Therefore, mechanically robust superhydrophobic graphene aerogels have enormous potential in oil-water separation applications. Graphene aerogels possess unique advantages for treating oil-water mixtures, but their fragile mechanical properties hinder further development, and their separation mechanisms remain unclear.
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| GB/T 7714 | Yang, Yu , Ren, Zhiying , Zhou, Chunhui et al. Anisotropic superhydrophobic graphene aerogel with radial superelasticity and axial superstiffness for efficient on-demand oil-water separation [J]. | JOURNAL OF MATERIALS CHEMISTRY A , 2023 , 11 (36) : 19524-19535 . |
| MLA | Yang, Yu et al. "Anisotropic superhydrophobic graphene aerogel with radial superelasticity and axial superstiffness for efficient on-demand oil-water separation" . | JOURNAL OF MATERIALS CHEMISTRY A 11 . 36 (2023) : 19524-19535 . |
| APA | Yang, Yu , Ren, Zhiying , Zhou, Chunhui , Lin, Youxi , Shi, Linwei , Hou, Linxi . Anisotropic superhydrophobic graphene aerogel with radial superelasticity and axial superstiffness for efficient on-demand oil-water separation . | JOURNAL OF MATERIALS CHEMISTRY A , 2023 , 11 (36) , 19524-19535 . |
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