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Defect suppression mechanism of ultrasonic vibration-assisted drilling carbon fiber/bismaleimide composite

Chinese Journal of Aeronautics 2023年第8期36卷 366-380页

作者： Shengguo ZHANG Wenhu WANG yifeng xiong Bo HUANG Ruisong JIANG Key Laboratory of High Performance Manufacturing for Aero Engine Ministry of Industry and Information TechnologySchool of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine Ministry of EducationSchool of Mechanical EngineeringNorthwestern Polytechnical UniversityXi’an 710072China School of Mechanical Engineering Sichuan UniversityChengdu 610207China

Ultrasonic vibration-assisted drilling(UVAD)has recently been successfully applied in the drilling of carbon fiber reinforced polymer/plastic(CFRP)due to its high *** defects have been observed in the CFRP drilling process which negatively affects the quality of the *** carbon fiber/bismaleimide(BMI)composites is an advanced kind of CFRPs with greater strength and heat resistance,having been rapidly applied in lightweight and high temperature resistant structures in the aerospace *** suppress the defect during the drilling of carbon fiber/BMI composites,it is necessary to comprehensively understand the defect formation and suppression mechanism at different *** this study,the defects formation in both conventional drilling(CD)and UVAD were observed and *** variation trend in the defect factor and thrust force with the spindle speed and feed rate were *** results revealed that the UVAD could significantly enhance the hole’s quality with no delamination and ***,the defect suppression mechanism and thrust force in UVAD were analyzed and verified,where the method of rod chip removal affected the exit defect *** summary,UVAD can be considered a promising and competitive technique for drilling carbon fiber/BMI composites.

关键词： CFRP Defect suppression Rod chip Thrust force UVAD

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Analytical model of cutting force in axial ultrasonic vibration-assisted milling in-situ TiB_(2)/7050Al PRMMCs

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Chinese Journal of Aeronautics 2021年第4期34卷 160-173页

作者： Xiaofen LIU Wenhu WANG Ruisong JIANG yifeng xiong Kunyang LIN Junchen LI Chenwei SHAN Key Laboratory of High Performance Manufacturing for Aero Engine Ministry of Industry and Information TechnologySchool of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an 710072China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine Ministry of EducationSchool of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an 710072China School of Aeronautics and Astronautics Sichuan UniversityChengdu 610065China

Ultrasonic vibration-assisted milling has been widely applied in machining the difficultto-cut materials owing to the remarkable improvements in reducing the cutting ***,analytical models to reveal the mechanism and predict the cutting force of ultrasonic vibrationassisted milling metal matrix composites are still needed to be *** this paper,an analytical model of cutting force was established for ultrasonic vibration-assisted milling in-situ TiB_(2)/7050 Al metal matrix *** modeling,change of motion of the cutting tool,contact of toolchip-workpiece and acceleration of the chip caused by ultrasonic vibration was considered based on equivalent oblique cutting ***,material properties,tool geometry,cutting parameters and vibration parameters were taken into ***,the developed analytical force model was validated with and without ultrasonic vibration milling experiments on in-situ TiB_(2)/7050 Al metal matrix *** predicted cutting forces show to be consistent well with the measured cutting ***,the relative error of instantaneous maximum forces between the predicted and measured data is from 0.4%to 15.1%.The analytical model is significant for cutting force prediction not only in ultrasonic-vibration assisted milling but also in conventional milling in-situ TiB_(2)/7050 Al metal matrix composites,which was proved with general applicability.

关键词： Al-MMCs Analytical model Cutting force In-situ Milling TiB_(2)particles Ultrasonic vibration

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Investigation on surface roughness,residual stress and fatigue property of milling in-situ TiB_2/7050Al metal matrix composites

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Chinese Journal of Aeronautics 2021年第4期34卷 451-464页

作者： yifeng xiong Wenhu WANG Yaoyao SHI Ruisong JIANG Chenwei SHAN Xiaofen LIU Kunyang LIN Key Laboratory of High Performance Manufacturing for Aero Engine Ministry of Industry and Information TechnologySchool of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an 710072China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine Ministry of EducationSchool of Mechanical EngineeringNorthwestern Polytechnical UniversityXi'an 710072China School of Aeronautics and Astronautics Sichuan UniversityChengdu 610065China

For higher efficiency and precision manufacturing,more and more attentions are focused on the surface roughness and residual stress of machined parts to obtain a good fatigue *** present,the in-situ TiB_2/7050 Al metal matrix composites are widely researched due to its attractive properties such as low density,good wear resistance and improved *** is of great significance to investigate the machined surface roughness,residual stress and fatigue life for higher efficiency and precision manufacturing of this new kind *** this study,the surface roughness including two-dimensional and three-dimensional roughness,residual stress and fatigue life of milling in-situ TiB_2/7050 Al metal matrix composites were *** was found from comparative investigation that the three-dimensional surface roughness would be more appropriate to represent the machined surface profile of milling particle reinforced metal matrix *** cutting temperature played a great role on the residual ***,the effect of increasing cutting force could slow down the transformation from compressive stress to tensile stress under 270°*** exponential relationship between three-dimensional roughness and fatigue life was established and the main fracture mechanism was brittle fracture with observation of obvious shellfish veins,river pattern veins and wave shaped veins in fracture surface.

关键词： Fatigue life Metal matrix composite Residual stress Three-dimensional surface roughness TiB_2 particle Two-dimensional surface roughness

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Multifunctional integration on optical fiber tips: challenges and opportunities

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Advanced Photonics 2020年第6期2卷 23-46页

作者： yifeng xiong Fei Xu Nanjing University College of Engineering and Applied SciencesNanjingChina

.The flat endface of an optical fiber tip is an emerging light-coupled microscopic platform that combines fiber optics with planar micro-and *** different materials and structures are integrated onto the endfaces,optical fiber tip devices have miniature sizes,diverse integrated functions,and low insertion losses,making them suitable for all-optical *** recent decades,the increasing demand for multifunctional optical fibers has created opportunities to develop various structures on fiber ***,the unconventional shape of optical fibers presents challenges involving the adaptation of standard planar micro-and nanostructure preparation strategies for fiber *** this context,researchers are committed to exploring and optimizing fiber tip manufacturing techniques,thereby paving the way for future integrated all-fiber devices with multifunctional ***,we present a broad overview of current fabrication technologies,classified as“top-down,”“bottom-up,”and“material transfer”methods,for patterning optical fiber ***,we review typical structures integrated on fiber tips and their known and potential applications,categorized with respect to functional structure configurations,including“optical functionalization”and“electrical integration.”Finally,we discuss the prospects for future opportunities involving multifunctional integrated fiber tips.

关键词： optical fibers fiber tips optical devices nanotechnology micro-optics nano-optics.

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Seeing at a distance with multicore fibers

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Opto-Electronic Advances 2024年第7期7卷 39-49页

作者： Haogong Feng Xi Chen Runze Zhu yifeng xiong Ye Chen Yanqing Lu Fei Xu National Laboratory of Solid State Microstructures College of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China College of Physics MIIT Key Laboratory of Aerospace Information Materials and PhysicsState Key Laboratory of Mechanics and Control for Aerospace StructuresNanjing University of Aeronautics and AstronauticsNanjing 211106China

Images and videos provide a wealth of information for people in production and *** most digital information is transmitted via optical fiber,the image acquisition and transmission processes still rely heavily on electronic *** development of all-optical transmission networks and optical computing frameworks has pointed to the direction for the next generation of data transmission and information ***,we propose a high-speed,low-cost,multiplexed parallel and one-piece all-fiber architecture for image acquisition,encoding,and transmission,called the Multicore Fiber Acquisition and Transmission Image System(MFAT).Based on different spatial and modal channels of the multicore fiber,fiber-coupled self-encoding,and digital aperture decoding technology,scenes can be observed directly from up to 1 km *** expansion of capacity provides the possibility of parallel coded transmission of multimodal high-quality *** requires no additional signal transmitting and receiving *** all-fiber processing saves the time traditionally spent on signal conversion and image pre-processing(compression,encoding,and modulation).Additionally,it provides an effective solution for 2D information acquisition and transmission tasks in extreme environments such as high temperatures and electromagnetic interference.

关键词： long-distance fiber imaging image transmission parallel transmission all-optical encoding multicore fiber

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搅拌摩擦加工Al-Pb表面复合材料的微结构和织构

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稀有金属材料与工程 2021年第3期50卷 957-962页

作者：许峰杨莉熊义峰刘坡张尧成常熟理工学院汽车工程学院江苏常熟215500 桂林航天工业学院机械工程学院广西桂林541004

采用搅拌摩擦加工(FSP)方法制备Al-Pb表面复合材料,以提高其减摩抗磨性能,使用SEM、EBSD、纳米压痕仪和显微硬度计等分析其微观组织、织构和硬度分布。结果表明:使用FSP方法制备Al-Pb表面复合材料,Pb颗粒受到重力和搅拌作用,主要分布于... 详细信息

采用搅拌摩擦加工(FSP)方法制备Al-Pb表面复合材料,以提高其减摩抗磨性能,使用SEM、EBSD、纳米压痕仪和显微硬度计等分析其微观组织、织构和硬度分布。结果表明:使用FSP方法制备Al-Pb表面复合材料,Pb颗粒受到重力和搅拌作用,主要分布于盆状搅拌加工区的底部。塑性金属对流形成的洋葱环结构中,存在富Pb片层和形变铝基体片层。富Pb片层内的Pb颗粒,起到了良好的细化晶粒作用。形变铝基体片层分布有少量直径约100 nm的新生Pb粒。受到细晶强化作用影响,富Pb颗粒区的硬度显著高于形变铝基体。加工区底部的SZ-AS区形成强Cube再结晶织构;SZ-RS区形成Cube织构和少量Brass织构;CSZ区的Cube织构较少,{111}织构增强;上部的AS区形成强Goss织构,RS区织构相对随机。

关键词：搅拌摩擦加工电子背散射衍射(EBSD) 微结构织构

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Label-free fiber nanograting sensor for real-time in situ early monitoring of cellular apoptosis

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Advanced Photonics 2022年第1期4卷 62-68页

作者： Danran Li Nina Wang Tianyang Zhang Guangxing Wu yifeng xiong Qianqian Du Yunfei Tian Weiwei Zhao Jiandong Ye Shulin Gu Yanqing Lu Dechen Jiang Fei Xu Nanjing University College of Engineering and Applied SciencesNanjingChina Nanjing University National Laboratory of Solid State MicrostructuresCollaborative Innovation Center of Advanced MicrostructuresNanjingChina Nanjing University School of Chemistry and Chemical EngineeringNanjingChina Nanjing University School of Electronic Science and EngineeringNanjingChina

The achievement of functional nanomodules for subcellular label-free measurement has long been pursued in order to fully understand cellular ***,a compact label-free nanosensor based on a fiber taper and zinc oxide nanogratings is designed and applied for the early monitoring of apoptosis in individual living *** of its nanoscale dimensions,mechanical flexibility,and minimal cytotoxicity to cells,the sensing module can be loaded in cells for long term in situ tracking with high sensitivity.A gradual increase in the nuclear refractive index during the apoptosis process is observed,revealing the increase in molecular density and the decrease in cell *** strategy used in our study not only contributes to the understanding of internal environmental variations during cellular apoptosis but also provides a new platform for nonfluorescent fiber devices for investigation of cellular events and understanding fundamental cell biochemical engineering.

关键词： fiber nanogratings label-free sensor apoptosis monitoring

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BIM技术在门式刚架轻钢结构厂房设计中的应用探讨

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山西建筑 2018年第24期44卷 34-35页

作者：熊逸丰华南理工大学广州学院广东广州510800

以某石材储存仓库为应用实例,构建优越于传统模型的BIM三维模型,重点探究门式刚架仓库设计中BIM技术在前期准备阶段、设计阶段、施工阶段的具体应用,以便为门式刚架轻钢结构厂房实际施工提供参考。

关键词： BIM技术门式刚架轻钢结构厂房

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压气机叶片辊轧模具型腔前滑补偿方法

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航空学报 2017年第1期38卷 323-332页

作者：靳淇超汪文虎蒋睿嵩赵德中崔康熊一峰西北工业大学现代设计与集成制造技术教育部重点实验室西安710072

辊轧模腔是叶片无余量辊轧成形的关键,然而压气机叶片辊轧成形过程中存在前滑现象,造成叶片沿辊轧方向精度偏差,需要在模具型腔设计过程中补偿前滑量,以实现叶片沿积叠高度的精确成形。针对叶片辊轧前滑现象,本文提出并研究了基于辊轧... 详细信息

辊轧模腔是叶片无余量辊轧成形的关键,然而压气机叶片辊轧成形过程中存在前滑现象,造成叶片沿辊轧方向精度偏差,需要在模具型腔设计过程中补偿前滑量,以实现叶片沿积叠高度的精确成形。针对叶片辊轧前滑现象,本文提出并研究了基于辊轧前滑补偿的压气机叶片辊轧模具型腔优化设计方法。首先,在分析前滑成因及叶片截面前滑表征模型的基础上,研究了前滑补偿机理并建立了前滑补偿模型,即型腔中心角与叶片积叠高度的对应关系。在此基础上,通过提取表征叶片的工艺模型截面线族,顺次计算截面前滑值并基于前滑补偿模型对辊轧模具型腔中心角进行修正。然后,基于修正后的型腔中心角,建立叶片工艺模型截面线族到型腔截面线族的空间扇态映射法则并进行截面线映射变换,进而基于型腔截面线重构了基于前滑补偿的叶片辊轧模具型腔。最后,通过高置信度数值计算方法比较了前滑补偿模腔和直接空间几何映射模腔辊轧成形叶片的积叠高度。结果表明,优化后的模具型腔能够有效提高叶片积叠轴方向上的成形精度。

关键词：压气机叶片辊轧前滑补偿模腔优化设计积叠高度

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一种改进的压气机叶片辊轧成型前滑计算模型

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航空学报 2016年第10期37卷 3178-3185页

作者：靳淇超汪文虎蒋睿嵩赵德中崔康熊一峰西北工业大学现代设计与集成制造技术教育部重点实验室西安710072

航空发动机压气机叶片在辊轧过程中,由于辊轧出口处构件速度大于轧辊速度,存在前滑现象,从而影响叶片辊轧成形精度。针对此问题,为实现叶片无余量辊轧成型,在分析对称辊轧前滑计算模型的基础上,提出并研究了叶片辊轧前滑,建立了叶片辊... 详细信息

航空发动机压气机叶片在辊轧过程中,由于辊轧出口处构件速度大于轧辊速度,存在前滑现象,从而影响叶片辊轧成形精度。针对此问题,为实现叶片无余量辊轧成型,在分析对称辊轧前滑计算模型的基础上,提出并研究了叶片辊轧前滑,建立了叶片辊轧前滑计算模型。为验证前滑计算模型精度,设计了薄板件、V形板件和叶片这3类典型构件CAD模型,基于DEFORM-3D对其辊轧成型过程进行数值计算分析。结果表明,该模型能够精确表达截面不规则类构件辊轧前滑量,为截面变化类构件辊轧前滑研究奠定基础。

关键词：压气机叶片辊轧成型截面线前滑模型有限元

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