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Experimental Study on Wear and Spalling Behaviors of Railway Wheel

Chinese Journal of Mechanical Engineering 2013年第6期26卷 1243-1249页

作者： WANG Wenjian GUO Jun liu qiyue Tribology Research Institute Southwest Jiaotong University

The current researches of the wear and spalling behaviors of wheel/rail materials focus on the field investigation rather than the mechanism. However, it is necessary and significant for clarifying the mechanism and relationship between the wear and spalling damage of railway wheel to test and reproduce the wheel damages in laboratory. The objective of this paper is to investigate the wear and spalling damage behaviors of railway wheel using a JD-1 wheel/rail simulation facility, which consists of a small wheel serving as rolling stock wheel, and a larger wheel serving as rail. The damage process of wheel roller is explored in terms of the creep ratio, axle load, and carbon content by means of various microscopic examinations. The experimental results show that the wear volume growth of wheel roller is proved to be proportional to the increase of the creep ratio and normal load between simulating wheel and rail. The increase of carbon content of wheel material causes a linear reduction in the wear volume. The microscopic examinations indicate that the rolling wear mechanism transfers from abrasive wear to adhesive and fatigue wear with an increase of tangential friction force, which results in the initiation of fatigue crack, and then aggravates spalling damage on the wheel roller surface. The surface hardness of material depends strongly upon its carbon content. The decrease of the carbon content of wheel material may alleviate spalling damage, but can cause a significant growth in the wear volume of wheel roller. Therefore, there is a competitive relationship between the wear and spalling damage of wheel material. This research proposes an important measure for alleviating or preventing the wear and spalling damage of railway wheel material.

关键词： wear spalling content carbon railway wheel wear mechanism

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激光表面淬火对车轮多边形萌生及发展影响试验研究

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摩擦学学报（中英文） 2024年第2期44卷 154-166页

作者：黄金伟王文健丁昊昊郭俊刘启跃祝毅齐欢西南交通大学轨道交通运载系统全国重点实验室摩擦学研究所四川成都610031 浙江大学流体动力与机电系统国家重点实验室浙江杭州310027 成都青石激光科技有限公司四川成都610031

车轮多边形磨损是影响列车服役可靠性的常见异常磨损形式,而激光淬火是提高金属材料耐磨性能的新型技术,但目前关于激光淬火对车轮多边形的影响尚未深入研究.因此,本文中将研究激光淬火对车轮多边形萌生与发展的影响规律,探讨利用激光... 详细信息

车轮多边形磨损是影响列车服役可靠性的常见异常磨损形式,而激光淬火是提高金属材料耐磨性能的新型技术,但目前关于激光淬火对车轮多边形的影响尚未深入研究.因此,本文中将研究激光淬火对车轮多边形萌生与发展的影响规律,探讨利用激光淬火技术抑制车轮多边形的可行性.首先利用激光器对车轮试样进行点状淬火和全表面淬火,利用MMS-2A微机控制摩擦磨损试验机进行轮轨滚动磨损试验,分析轮轨系统振动频率、车轮试样磨损表面宏观形貌、廓形、多边形阶数以及材料损伤等,探明激光淬火对车轮多边形形成的影响.结果表明:在车轮试样表面沿圆周方向均匀地进行12个和16个点状淬火时,滚动磨损试验中车轮试样分别萌生出12阶和16阶多边形,并激发出严重的轮轨系统振动,最终在15万转时产生较大波深的车轮多边形.对车轮表面进行全表面淬火处理时,滚动磨损试验过程中始终无车轮多边形产生.在此基础之上,本文作者对未淬火车轮试样进行6万转滚动磨损试验以形成多边形磨损,然后对多边形车轮试样进行点状淬火(波谷处淬火)和全表面淬火,继而进行轮轨滚动磨损试验.研究表明:对多边形车轮试样波谷区进行淬火强化后,多边形发展表现出先放缓后加快的现象,波谷逐渐转变为波峰;对多边形车轮试样进行全表面淬火强化后,多边形继续发展,运行15万转后多边形波深呈轻微下降趋势.研究结果对车轮多边形磨损控制技术研究具有理论指导意义.

关键词：车轮多边形激光表面淬火磨损硬度塑性变形

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硬度匹配对轮轨滚动接触疲劳损伤行为的影响规律研究

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材料导报 2024年第S1期38卷 415-421页

作者：贾劭飞李英奇周韶博刘佳朋王泓豪丁昊昊刘启跃王文健西南交通大学轨道交通运载系统全国重点实验室摩擦学研究所成都610031 中国铁道科学研究院集团有限公司金属及化学研究所北京100081

随着我国铁路的高速发展,轮轨在服役过程中的疲劳损伤问题愈加突出,因此,本工作利用MJP-30A滚动磨损与接触疲劳试验机研究轮轨滑差率、轮轨硬度比对滚动接触疲劳裂纹发展的影响。结果表明:滑差率较小时,疲劳裂纹较短,且裂纹沿着表面小... 详细信息

随着我国铁路的高速发展,轮轨在服役过程中的疲劳损伤问题愈加突出,因此,本工作利用MJP-30A滚动磨损与接触疲劳试验机研究轮轨滑差率、轮轨硬度比对滚动接触疲劳裂纹发展的影响。结果表明:滑差率较小时,疲劳裂纹较短,且裂纹沿着表面小角度扩展;滑差率大时,切向力增大,表层裂纹会被磨掉。循环转数小时,裂纹均停留在试样表层,扩展不明显;循环转数过大时,枝裂纹扩展相互连接形成网状。对比不同硬度材料的裂纹扩展试验发现:不同硬度匹配对裂纹扩展有着较大影响,硬度高的材料表面塑性变形较小,裂纹扩展速度慢,裂纹长度、宽度以及深度都较小;硬度低的材料裂纹扩展速度快,裂纹长度、宽度以及深度都有所增加。裂纹在试样中不同深度处的扩展速度有着较大差异,在靠近试样表面的裂纹需要克服的扩展阻力较大,故大多裂纹都停留在塑性变形层区域;一旦裂纹突破至基体区域,裂纹的扩展速度就会急剧增加。

关键词：疲劳裂纹硬度匹配滑差塑性变形微观组织

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Superhydrophilic Polydopamine‑Modified Carbon‑Fiber Membrane with Rapid Seawater‑Transferring Ability for Constructing Efficient Hanging‑Model Evaporator

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Advanced Fiber Materials 2023年第3期5卷 1063-1075页

作者： Wenmei Chong Ruru Meng Zixiao liu qiyue liu Jinjing Hu Bo Zhu Daniel KMacharia Zhigang Chen Lisha Zhang State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua UniversityShanghai 201620China College of Environmental Science and Engineering Donghua UniversityShanghai 201620China

Solar-driven seawater desalination has attracted much attention for alleviating global freshwater shortage,but the practical application is often limited by complicated fabrication processes,unsatisfactory seawater-transferring and severe salt accu-mulation on the photothermal *** solve these problems,hydrophobic industrial-grade carbon fiber membrane(CFM)with good photoabsorption was surface-modified with polydopamine(PDA)to prepare superhydrophilic CFM@PDA for the construction of efficient hanging-model evaporators without salt *** coating of PDA on CFM is realized by simple self-polymerization of dopamine,and the as-prepared CFM@PDA exhibits high solar absorption effi-ciency of 96.7%,good photothermal effect and ***,when CFM@PDA is hanging between two water tanks(one contains seawater and the other is empty)in a flat hanging-model evaporator,it can transport seawater at a high rate(26.35 g/h)which is 3.6 times that(7.28 g/h)of commercial cotton *** simulated sunlight(1.0 kW m^(-2))irradiation,CFM@PDA shows a high evaporation rate of 1.79 kg m^(-2) h^(-1) with a solar evaporation efficiency of 92.6%.Even if NaCl solution with a high concentration(21.0 wt%)is used for the evaporation,the hanging CFM@PDA can retain a high evaporation rate(~1.80 kg m^(-2) h^(-1))without salt accumulation during the long-time test(8 h),which is significantly better than that of the tradition floating ***,this study not only demonstrates the simple preparation of super-hydrophilic CFM@PDA,but also promotes the further practical applications of hanging-model evaporators for continuous salt-free desalination.

关键词： Carbon fiber membrane Polydopamine Superhydrophilicity Hanging-model evaporator Solar-driven seawater desalination

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Effects of solid friction modifier on friction and rolling contact fatigue damage of wheel-rail surfaces

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Friction 2022年第4期10卷 597-607页

作者： Jingdong SONG Lubing SHI Haohao DING Radovan GALAS Milan OMASTA Wenjian WANG Jun GUO qiyue liu Martin HARTL Tribology Research Institute State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengdu 610031China School of Mechanical Engineering Xi’an Jiaotong UniversityXi’an 710049China Faculty of Mechanical Engineering Brno University of TechnologyBrno 61669Czech Republic

In railway network,friction is an important factor to consider in terms of the service behaviors of wheel-rail *** objective of this study was to investigate the effect of a solid friction modifier(FM)in a railway *** was achieved by studying the friction,wear,and rolling contact fatigue(RCF)damage on the wheel-rail materials at different slip *** results showed that when a solid FM was applied,the friction coefficient *** the solid FM was separated from the wheel-rail interface,the friction coefficient gradually increased to its original *** the application of the solid FM,the wear rates of the wheel-rail *** addition,the thickness and hardness of the plastic deformation layers of the wheel-rail materials were *** worn surfaces of the wheel-rail were dominated by pits and RCF *** the FM,RCF cracks ranged from 84 to 120μm,and subsurface cracks were ***,with the FM,RCF cracks ranged from 17 to 97μm and no subsurface cracks were *** findings indicate possible methods of improving the performance of railway rolling stock by managing friction,and reducing wear and permanent RCF damage affecting both the wheels and rails.

关键词： wheel-rail solid friction modifier(FM) friction wear rolling contact fatigue(RCF)damage

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Gaps,challenges and possible solution for prediction of wheel-rail rolling contact fatigue crack initiation

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Railway Engineering Science 2023年第3期31卷 207-232页

作者： Shuyue Zhang qiyue liu Maksym Spiryagin Qing Wu Haohao Ding Zefeng Wen Wenjian Wang State Key Laboratory of Traction Power Tribology Research InstituteSouthwest Jiaotong UniversityChengdu 610031China Centre for Railway Engineering Central Queensland UniversityRockhamptonQLDAustralia

The prediction of wheel/rail rolling contact fatigue(RCF)crack initiation during railway operations is an important *** RCF crack evolution is influenced by many factors,its prediction process is *** paper reviews the existing approaches to predict RCF crack *** crack initiation region is predicted by the shakedown *** combining the shakedown map with various initiation criteria and the critical plane method,the crack initiation life is *** classification,methodologies,theories and applications of these approaches are included in this *** advantages and limitations of these methods are analyzed to provide recommendation for RCF crack initiation *** review highlights that wheel/rail dynamic characteristic,complex working conditions,surface defects and wear all affect the RCF crack *** optimal selection of criteria is essential in the crack initiation *** on the research gap regarding the challenging process of crack initiation prediction detailed in this review,a proposed prediction process of RCF crack initiation is proposed to achieve a more accurate result.

关键词： RCF Crack initiation prediction Shakedown map Criteria Wheel-rail contact

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基于双目视觉的列车轮对表面缺陷及型面参数检测方法

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中国测试 2024年第8期50卷 101-108页

作者：胡成放丁昊昊陈德君张岩刘启跃王文健郭俊林强西南交通大学唐山研究院河北唐山063000 西南交通大学轨道交通运载系统全国重点实验室摩擦学研究所四川成都610031 唐山百川智能机器股份有限公司河北唐山063000 浙江师范大学浙江省城市轨道交通智能运维技术与装备重点实验室浙江金华321004

列车轮对表面缺陷及磨耗后的车轮轮型参数对列车安全行驶具有重要影响。搭建一种基于结构光与双目立体视觉相结合的非接触式列车轮对型面检测系统,设计针对车轮滚动圆直径、轮缘高度、轮缘厚度以及车轮擦伤的双目视觉无损检测方法。首... 详细信息

列车轮对表面缺陷及磨耗后的车轮轮型参数对列车安全行驶具有重要影响。搭建一种基于结构光与双目立体视觉相结合的非接触式列车轮对型面检测系统,设计针对车轮滚动圆直径、轮缘高度、轮缘厚度以及车轮擦伤的双目视觉无损检测方法。首先基于迭代最近点(iterative closest point,ICP)算法将各相机采集的车轮型面数据拼接为整体车轮点云三维模型;然后,从该三维模型中提取出滚动圆与轮缘顶点圆,基于最小二乘拟合法分别计算滚动圆直径、轮缘高度、轮缘厚度参数;最后,基于模式匹配方法检测车轮型面是否出现擦伤缺陷,并计算得到擦伤深度。检测结果表明:该列车轮对型面检测系统及表征方法对于滚动圆直径检测误差为0.22 mm,对于轮缘高度与轮缘厚度检测误差分别为–0.08 mm及0.07 mm,最大擦伤深度检测误差为0.18 mm。研究成果可有效检测列车车轮型面参数及擦伤缺陷,具有较强的工程应用价值。

关键词：双目立体视觉迭代最近点型面参数车轮擦伤模式匹配

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A novel deep learning framework with variational auto-encoder for indoor air quality prediction

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Frontiers of Environmental Science & Engineering 2024年第1期18卷 97-109页

作者： qiyue Wu Yun Geng Xinyuan Wang Dongsheng Wang ChangKyoo Yoo Hongbin liu Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing Forestry UniversityNanjing 210037China College of Automation&College of Artificial Intelligence Nanjing University of Posts and TelecommunicationsNanjing 210023China Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control College of Light Industry and Food EngineeringGuangxi UniversityNanning 530004China Laboratory for Comprehensive Utilization of Paper Waste of Shandong Province Shandong Huatai Paper Co.Ltd.Dongying 257335China Department of Environmental Science and Engineering College of EngineeringKyung Hee UniversityYongin 446701Republic of Korea

Exposure to poor indoor air conditions poses significant risks to human health, increasing morbidity and mortality rates. Soft measurement modeling is suitable for stable and accurate monitoring of air pollutants and improving air quality. Based on partial least squares (PLS), we propose an indoor air quality prediction model that utilizes variational auto-encoder regression (VAER) algorithm. To reduce the negative effects of noise, latent variables in the original data are extracted by PLS in the first step. Then, the extracted variables are used as inputs to VAER, which improve the accuracy and robustness of the model. Through comparative analysis with traditional methods, we demonstrate the superior performance of our PLS-VAER model, which exhibits improved prediction performance and stability. The root mean square error (RMSE) of PLS-VAER is reduced by 14.71%, 26.47%, and 12.50% compared to single VAER, PLS-SVR, and PLS-ANN, respectively. Additionally, the coefficient of determination (R2) of PLS-VAER improves by 13.70%, 30.09%, and 11.25% compared to single VAER, PLS-SVR, and PLS-ANN, respectively. This research offers an innovative and environmentally-friendly approach to monitor and improve indoor air quality.

关键词： Indoor air quality PM_(2.5)concentration Variational auto-encoder Latent variable Soft measurement modeling

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Experimental and numerical analyses of the effect of fibre content on the close-in blast performance of a UHPFRC beam

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Defence Technology（防务技术） 2024年第1期31卷 242-261页

作者： Junbo Yan qiyue Zhang Yan liu Yingliang Xu Zhenqing Shi Fan Bai Fenglei Huang State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China Beijing Institute of Technology Chongqing Innovation Center Chongqing 401120China

Limited research has been conducted on the influences of fiber content on close-in blasting characteristics for ultrahigh-performance fiber-reinforced concrete(UHPFRC)*** paper aims to address this knowledge gap through experimental and mesoscale numerical *** were conducted on ten UHPFRC beams built with varying steel fiber volumetric fractions subjected to close-in explosive ***,this study considered other parameters,such as the longitudinal reinforcement type and *** the case of UHPFRC beams featuring normal-strength longitudinal reinforcement of diametersΦ12,Φ16,andΦ20,a reduction in maximum displacement by magnitudes of19.6%,19.5%,and 17.4%was observed,respectively,as the volumetric fractions of fiber increased from1.0%to 2.5%.In addition,increasing the longitudinal reinforcement ratio and using high-strength steel longitudinal reinforcement both significantly reduced the deformation characteristics and increase the blasting resistances of UHPFRC ***,the effects on the local crushing and spalling damage were not significant.A mesoscale finite element model,which considers the impacts of fiber parameters on UHPFRC beam behaviors,was also established and well correlated with the test ***,parametric analyses were further conducted to examine the impacts of the steel fiber content and length and the hybrid effects of various types of microfibers and steel fibers on the blasting performance of UHPFRC beams.

关键词： Blast performance Close-in blast Fiber content Mesoscale approach UHPFRC beams

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Ablative behavior and mechanism of SiC_(f) /SiBCZr composites prepared by PIP process

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Journal of Advanced Ceramics 2024年第1期13卷 124-134页

作者： Mingwei Chen Yuliang Zhao Haipeng Qiu Shijian liu Weijie Xie Yi Chen qiyue Zhang AVIC Manufacturing Technology Institute Beijing 100130China

SiC_(f)/SiBCZr composites were prepared by polymer precursor impregnation and pyrolysis process with near stoichiometric ratio SiC fiber preform as reinforcement phase and SiBCZr multiphase ceramic precursor as impregnating *** results highlighted that the SiC_(f)/SiBCZr composites exhibited excellent ablative properties after ablative tests at 1200℃/3600 s and 1400℃/3600 s,and the strength retention rates of the composites reached 90%and 85%,*** was mainly due to the liquid sealing effect of the ablative products represented by B2O_(3) and SiO_(2)∙B_(2)O_(3),which inhibited the ablative reaction by reducing the diffusion rate of the oxidation medium,and the solid pinning effect of the substances represented by SiO_(2),ZrO_(2),and ZrSiO_(4),which could play high viscosity and high strength characteristics to improve anti-erosion *** above-mentioned SiC_(f)/SiBCZr composites with corrosion resistance,oxidation resistance,and ablative resistance provided a solid material foundation and technical support for the development of reusable spacecraft hot-end components.

关键词： near stoichiometric ratio SiC fiber SiC_(f)/SiBCZr composite liquid sealing effect solid pinning effect

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