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Effect of fatigue load on the bending tribo-corrosion-fatigue behaviors between the main cable wires

Friction 2024年第7期12卷 1512-1531页

作者： Bo WANG Dagang WANG Jihong YE Liang TANG Hailang CHONG Wei XU Xinxin ZHANG Jianhao CHEN Haiyan DENG Jie ZHANG Guowen YAO magd Abdel WAHAB School of Mechatronic Engineering China University of Mining and TechnologyXuzhou 221116China Xuzhou Key Laboratory for Fire Safety of Engineering Structures China University of Mining and TechnologyXuzhou 221116China National Wire Rope Quality Inspection Center Nantong Product Quality Supervision and Inspection InstituteNantong 226011China Jiangsu Langshan Wire Rope Co. Ltd.Nantong 226003China School of Mechatronic Engineering Southwest Petroleum UniversityChengdu 610500China School of Civil Engineering Chongqing Jiaotong UniversityChongqing 400074China Soete Laboratory Faculty of Engineering and ArchitectureGhent UniversityZwijnaarde B-9052Belgium

The main cable bent around the saddle of the suspension bridge is subjected to the wind,the vehicle,the bridge’s own weight and the corrosive *** coupling of the three loads and the environments causes the friction,the corrosion,and the fatigue(tribo-corrosion-fatigue)among the wires inside the main *** this paper,a wire bending tribo-corrosion-fatigue test rig was designed and *** effect of fatigue load on the bending friction behaviors between the cable wires in ultrapure water and 3.5%NaCl solution was *** tribological properties and electrochemical corrosion behaviors under different fatigue loading ranges were *** tribo-corrosion-fatigue interaction between the cable wires was quantitatively characterized,and the mechanism of the interaction was *** results demonstrate that the increasing fatigue load exacerbates the coupling damage of the cable wires attributed to the enhanced *** findings carry theoretical importance when assessing the main cable’s deterioration and the load-bearing safety of a suspension bridge.

关键词： bending tribo-corrosion-fatigue interaction parallel steel wires fatigue load

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Highly sensitive flexible strain sensor based on the two-dimensional semiconductor tellurium with a negative gauge factor

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Science China(Information Sciences) 2024年第7期67卷 295-304页

作者： Jiarui HE Yusong QU Shengyao CHEN Cong WANG lena DU Xiaoshan DU Yuanyuan ZHENG Guozhong ZHAO He TIAN College of Mathematics and Physics Beijing University of Chemical Technology School of Integrated Circuits Tsinghua University Beijing China & The Beijing National Research Center for Information Science and Technology (BNRist)Tsinghua University CAS Center for Excellence in Nanoscience National Center for Nanoscience and Technology &University of Chinese Academy of Sciences Beijing Key Lab of Terahertz Spectroscopy and Imaging Key Lab of Terahertz OptoelectronicsMinistry of Education Department of Physics Capital Normal University

Research on flexible strain sensors has advanced rapidly in recent years, with particular attention being devoted to two-dimensional(2D) semiconductor materials owing to their exceptional mechanical and electrical properties that are conducive to sophisticated sensing performance. However, resistive strain sensors based on 2D semiconductor materials typically exhibit positive gauge factors(GF), while materials for strain sensors with a negative GF remain elusive. We have identified a trend of reduction in the band gap of the emerging 2D semiconductor material tellurium(Te) under strain in simulations reported in past research,and have observed a negative GF in the Te-based strain sensor. In this study, we combined Te with a flexible polyethylene terephthalate(PET) substrate to manufacture a flexible strain sensor with a significantly negative GF. The results of tests revealed that the Te-based strain sensor achieved an impressive maximum sensitivity of-139.7 within a small range of bending-induced strain(< 1%). Furthermore, it exhibited excellent linearity and good cyclic stability, and was successfully applied to monitor limb movements. The work here verifies the significant potential for the use of Te-based strain sensors in next-generation flexible electronics.

关键词： 2D semiconductor materials 2D tellurium flexibleelectronics strain sensors negative gauge factor high sensitivity

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The Channel Branches & Network Vessels on the Tianhui Lacquered Meridian Figurine——Taking the Heart-Regulated Channel as an Example

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Chinese Medicine and Culture 2024年第3期7卷 222-232页

作者： ZHOU Qi lena Springer Institute for the History of Chinese Medicine and Medical Literature China Academy of Chinese Medical SciencesBeijing 100700China Department for Theology and Religious Studies King’s College LondonLondon WC2B 6NRUnited Kingdom Institute of Chinese Su Folk Culture Studies Sichuan UniversityChengdu 610065China

Along with the surge of unearthed medical literature and cultural relics in recent years,a network of channels in the system of medical conduit vessels(meridians) during the early Western Han dynasty has become much clearer *** it,the increasing number of channel branches,network vessels and needle insertion holes(acupoints) is an important feature of the development of channel medicine during the Western Han *** is not only a reflection of the expanding requirements of the theoretical system of the main trunk channels and other vessels,but also an inevitable result of the continuous enrichment and accumulation of clinical *** article integrates the information about channel branches,network vessels,inscriptions,dots and further relics on the Tianhui(天回) Lacquered Meridian Figurine to compare the unearthed literature of the channel genre with the transmitted classical literature about *** “Heart-Regulated Channel” in Medical Manuscripts on Bamboo Slips from Tianhui(《天回医简》) serves as an example to explain the occurrence,development and changes of the channel branches and network vessels in the early system of medical channels.

关键词： Tianhui Lacquered Meridian Figurine(天回髹漆经脉人像) Tianhui Medicine Slips Heart-Regulated Channel(心主之脉) Channel branches Network channels

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Understanding Behavioral Manifestations of Obsessive-Compulsive Disorder in People with Intellectual Disabilities—A Qualitative Study

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Open Journal of Psychiatry 2024年第2期14卷 67-90页

作者： lena Grüter Matthias Grünke Department of Rehabilitation and Special Education University of Cologne Cologne Germany

Background: There is limited knowledge about obsessive-compulsive disorder (OCD) in people with intellectual disabilities (IDs). This paper describes the manifestation of compulsive behaviors associated with OCD at the behavioral level in people with ID in institutionalized settings. The aim was to gain nuanced insight into appropriate understanding and classification in this specific context, and derive implications for research and practice. Methods: Individual cases of people with ID (n = 7) were studied to assess compulsive symptoms through two days of on-site observation of the person with ID within the institution, guided group discussions (n = 28), and semi-structured interviews with key informants and caregivers of the person with ID (n = 20). Caregiver ratings of the compulsive behavior checklist were compiled. Data were analyzed using qualitative content analysis. Results: All forms of OCD were present. Characteristics of compulsive behaviors in people with ID at the behavioral level included less complex and more obvious compulsive acts, immediate responses, signs of tension, motor restlessness, facial expression changes, repetition, need for predictability, time-consuming behaviors, and aggressive reactions when these acts were interrupted. Some of the compulsive behaviors corresponded to the ICD-11 OCD code 6B20, and others to compulsions as a psychological symptom (MB23.4). Conclusions: OCD may manifest atypically at the behavioral level in people with ID, posing significant challenges for accurate classification due to symptom ambiguity. Follow-up differential diagnostic studies are needed to more accurately identify and differentiate OCD symptoms in people with ID. Further, disorder-specific guidelines for recognizing OCD in people with ID are needed for institutionalized settings without psychiatric-psychotherapeutic expertise.

关键词： People with Intellectual Disabilities Obsessive-Compulsive Disorder Compulsive Behavior Diagnostics Differential Diagnosis

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Memristive feature and mechanism induced by laser-doping in defect-free 2D semiconductor materials

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Journal of Semiconductors 2024年第7期45卷 85-91页

作者： Xiaoshan Du Shu Wang Qiaoxuan Zhang Shengyao Chen Fengyou Yang Zhenzhou Liu Zhengwei Fan Lijun Ma Lei Wang lena Du Zhongchang Wang Cong Wang Bing Chen Qian Liu College of Electronic and Information Engineering Shandong University of Science and TechnologyQingdao 266590China National Center for Nanoscience and Technology&University of Chinese Academy of Sciences Beijing 100190China Hebei University of Water Resources and Electric Engineering Electrical Automation Department Cangzhou 061001China The MOE Key Laboratory of Weak-Light Nonlinear Photonics and International Sino-Slovenian Join Re-search Center on Liquid Crystal Pho-tonics TEDA Institute of Applied Physics and School of PhysicsNankai UniversityTianjin 300457China College of Mathematics and Physics Shandong Advanced Optoelectronic Materials and Technologies Engineering LaboratoryQingdao Uni-versity of Science and TechnologyQingdao 266061China Department of Physics Capital Normal UniversityBeijing 100048China Department of Advanced Materials and Computing International Iberian Nanotechnology Laboratory(INL)4715-330 BragaPortugal College of Mathematics and Physics Beijing University of Chemical TechnologyBeijing 100029China

Memristors as non-volatile memory devices have gained numerous attentions owing to their advantages in storage,in-memory computing, synaptic applications, etc. In recent years, two-dimensional(2D) materials with moderate defects have been discovered to exist memristive feature. However, it is very difficult to obtain moderate defect degree in 2D materials, and studied on modulation means and mechanism becomes urgent and essential. In this work, we realized memristive feature with a bipolar switching and a configurable on/off ratio in a two-terminal MoS_(2) device(on/off ratio ~100), for the first time, from absent to present using laser-modulation to few-layer defect-free MoS_(2)(about 10 layers), and its retention time in both high resistance state and low resistance state can reach 2×10^(4) s. The mechanism of the laser-induced memristive feature has been cleared by dynamic Monte Carlo simulations and first-principles calculations. Furthermore, we verified the universality of the laser-modulation by investigating other 2D materials of TMDs. Our work will open a route to modulate and optimize the performance of 2D semiconductor memristive devices.

关键词： 2D-material memristor laser doping laser direct writing memristive mechanism

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Multi-Scale Analysis of Fretting Fatigue in Heterogeneous Materials Using Computational Homogenization

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Computers, Materials & Continua 2020年第1期62卷 79-97页

作者： Dimitra Papagianni magd Abdel Wahab Department of Materials Science and Engineering University of IoanninaIoanninaGreece Soete Laboratory Faculty of Engineering and ArchitectureGhent UniversityTechnologiepark Zwijnaarde 903Zwijnaarde B-9052Belgium Division of Computational Mechanics Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityVietnam

This paper deals with modeling of the phenomenon of fretting fatigue in heterogeneous materials using the multi-scale computational homogenization technique and finite element analysis(FEA).The heterogeneous material for the specimens consists of a single hole model(25% void/cell,16% void/cell and 10% void/cell)and a four-hole model(25%void/cell).Using a representative volume element(RVE),we try to produce the equivalent homogenized properties and work on a homogeneous specimen for the study of fretting ***,the fretting fatigue contact problem is performed for 3 new cases of models that consist of a homogeneous and a heterogeneous part(single hole cell)in the contact *** aim is to analyze the normal and shear stresses of these models and compare them with the results of the corresponding heterogeneous models based on the Direct Numerical Simulation(DNS)***,by comparing the computational time and%deviations,we draw conclusions about the reliability and effectiveness of the proposed method.

关键词： Fretting fatigue multi-scale analysis computational homogenization heterogeneous materials stress analysis finite element analysis

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A Review on Fretting Wear Mechanisms,Models and Numerical Analyses

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Computers, Materials & Continua 2019年第5期59卷 405-432页

作者： Tongyan Yue magd Abdel Wahab State Grid Xinyuan Maintenance Branch BeijingChina Department of Electrical Energy MetalsMechanical Constructions&SystemsSoete LaboratoryFaculty of Engineering and ArchitectureGhent UniversityGhentBelgium Division of Computational Mechanics Ton Duc Thang UniversityHo Chi Minh CityVietnam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi Minh CityVietnam

Fretting wear is a material damage in contact surfaces due to micro relative displacement between *** causes some general problems in industrial applications,such as loosening of fasteners or sticking in components supposed to move relative to each *** wear is a complicated problem involving material properties of tribosystem and working conditions of *** to these various factors,researchers have studied the process of fretting wear by experiments and numerical modelling *** paper reviews recent literature on the numerical modelling method of fretting *** a briefly introduction on the mechanism of fretting wear,numerical models,which are critical issues for fretting wear modelling,are *** paper is concluded by highlighting possible research topics for future work.

关键词： Fretting wear wear models wear mechanisms numerical modelling

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Effect of wear debris on fretting fatigue crack initiation

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Friction 2022年第6期10卷 927-943页

作者： Shengjie WANG Tongyan YUE Dagang WANG magd ABDEL WAHAB Soete Laboratory Department of Electrical EnergyMetalsMechanical Construction&SystemsFaculty of Engineering and ArchitectureGhent UniversityGhent 9052Belgium State Grid Xinyuan Maintenance Branch Beijing 100000China School of Mechatronic Engineering China University of Mining and TechnologyXuzhou 221116China Faculty of Engineering Van Lang UniversityHo Chi Minh City 700000Vietnam Soete Laboratory Ghent UniversityGhent 9052Belgium

Both wear and fatigue occur in fretting condition,and they interact with one another during the whole *** fatigue is commonly analysed without considering the effect of wear in partial slip regime,although wear affects the lifetime of crack *** paper investigates,for the first time,the effect of wear debris on fretting fatigue crack *** investigate the effect of debris,first fretting wear characteristics in partial slip regime are analysed for loading ***,the effect of wear on fretting fatigue crack initiation is investigated using Ruiz parameters and critical plane methods without considering the debris *** the results,we can see that loading conditions affect the wear profiles in different ***,wear has a significant effect on the fatigue in partial slip regime without considering debris especially on the crack initiation ***,considering wear debris in the analysis,its effect on critical plane parameters is *** is found that by considering the wear debris effect,the frtting fatigue crack initiation location is shifted towards the trailing *** predictions of both crack initiation location and lifetime show a good agreement with the experimental data.

关键词： fretting wear fretting fatigue critical plane Ruiz parameter debris

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Gottfried Konecny:the influence in the global development of the three geosciences

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Geo-Spatial Information Science 2021年第1期24卷 22-26,I0005页

作者： lena Halounová Department of Geomatics Faculty of Civil EngineeringCzech Technical University(CTU)PragueGzech Republic

The paper contains a brief overview of the professional activities of Professor Gottfried Konecny,Professor Emeritus at the Institute of Photogrammetry and GeoInformation,Leibniz University Hannover,Germany,and his influence on photogrammetry,remote sensing and geospatial information science during his time at the University of New Brunswick,Canada,and at the Leibniz *** work can be divided into educational,scientific,application,organizational,and work in international *** activities comprised of giving courses in various languages,consultancy activities,and various other cooperations which took place in many South American countries,in Africa and Asia,for organizations such as the World Bank,United Nations,German Space Agency DLR,to name only a *** in connection with international societies mainly took place during ***’s engagement in the Council of the International Society for Photogrammetry(ISP),renamed the International Society for Photogrammetry and Remote Sensing(ISPRS),and the European Association of Remote Sensing Laboratories(EARSeL)*** was a key figure in bringing many countries and organizations to ISPRS as Ordinary and Sustaining *** Konecny has always been aware of the importance of international cooperation at various levels,also with sister societies such as the International Cartographic Association and the United Nations-Global Geospatial Information Management(UN-GGIM).His application activities span from the photogrammetry-oriented projects he was awarded in Canada,to remote sensing topics and geospatial sciences,combined with cartography during his Hannover *** vision and endless effort are exemplary for a person who has always been devoted to the three geosciences mentioned *** Konecny is the author of a number of books,journal papers and papers presented at international and national *** has been a recognized keynote speaker at many conferences t

关键词： Photogrammetry remote sensing spatial information sciences International Society for Photogrammetry and Remote Sensing research publication project cooperation

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Review on the Prediction of Residual Stress in Welded Steel Components

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Computers, Materials & Continua 2020年第2期62卷 495-523页

作者： Junyan Ni Xincun Zhuang magd Abdel Wahab Soete Laboratory Faculty of Engineering and ArchitectureGhent UniversityGhentBelgium Institute of Forming Technology and Equipment School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghaiChina National Engineering Research Center of Die&Mold CAD Shanghai Jiao Tong UniversityShanghaiChina Division of Computational Mechanics Ton Duc Thang UniversityHo Chi MinhVietnam Faculty of Civil Engineering Ton Duc Thang UniversityHo Chi MinhVietnam

Residual stress after welding has negative effects on the service life of welded steel components or *** work reviews three most commonly used methods for predicting residual stress,namely,empirical,semi-empirical and process simulation *** principles adopted by these methods are *** features and limitations of each method are discussed as *** empirical method is the most practical but its accuracy relies heavily on *** theories are employed in the semi-empirical method,while other aspects,such as temperature variation and phase transformation,are simply *** process simulation method has been widely used due to its capability of handling with large and complex *** improve its accuracy and efficiency,several improvements need to be done for each simulation aspect of this method.

关键词： Computational simulation steel welding residual stress

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