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Ratcheting Behavior of SA508-3 Steel at Elevated Temperature:Experimental Observation and Simulation

Acta Metallurgica Sinica(English Letters) 2017年第9期30卷 822-828页

作者： Jun Tian Yu Yang Li-Ping Zhang Xue-Jiao Shao Juan Du Qian-Hua Kan Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong University

A series of monotonic uniaxial tensile tests, strain-controlled and stress-controlled cyclic tests of SA508-3 steel were conducted from 25 to 350℃. Results showed that the steel exhibited temperature-dependent cyclic softening characteristic and obvious ratcheting behavior, and dynamic strain aging was observed in the range of 250-350℃. Based on experimental observations, a temperature-dependent cyclic plastic constitutive model was proposed by introducing the nonlinear cyclic softening and kinematic hardening rules, and the dynamic strain aging was also considered into the constitutive model. Comparisons between experiments and simulations were carded out to validate the proposed model at elevated temperature.

关键词： Ratcheting Constitutive model Dynamic strain aging Cyclic loading Elevated temperature

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Mapping essential urban land use categories in china(EULUC-china):preliminary results for 2018

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Science Bulletin 2020年第3期65卷 182-187页

作者： Peng Gong Bin Chen Xuecao Li Han Liu Jie Wang Yuqi Bai Jingming Chen Xi Chen Lei Fang Shuailong Feng Yongjiu Feng Yali Gong Hao Gu Huabing Huang Xiaochun Huang Hongzan Jiao Yingdong Kang Guangbin Lei Ainong Li Xiaoting Li Xun Li Yuechen Li Zhilin Li Zhongde Li Chong Liu Chunxia Liu Maochou Liu Shuguang Liu Wanliu Mao Changhong Miao Hao Ni Qisheng Pan Shuhua Qi Zhehao Ren Zhuoran Shan Shaoqing Shen Minjun Shi Yimeng Song Mo Su Hoi Ping Suen Bo Sun Fangdi Sun Jian Sun Lin Sun Wenyao Sun Tian Tian Xiaohua Tong Yihsing Tseng Ying Tu Hong Wang Lan Wang Xi Wan Zongming Wang Tinghai Wu Yaowen Xie Jian Yang Jun Yang Man Yuan Wenze Yue Hongda Zeng Kuo Zhang Neng Zhang Tao Zhang Yu Zhang Feng Zhao Yichen Zheng Qiming Zhou Nicholas Clinton Zhiliang Zhu Bing Xu Ministry of Education Key Laboratory for Earth System Modeling Department of Earth System ScienceTsinghua UniversityBeijing 100084China Tsinghua Urban Institute Tsinghua UniversityBeijing 100084China Center for Healthy Cities Institute for China Sustainable UrbanizationTsinghua UniversityBeijing 100084China Department of Land Air and Water ResourcesUniversity of CaliforniaDavisCA 95616-8627USA Department of Geological and Atmospheric Sciences Iowa State UniversityAmesIA 50011USA State Key Laboratory of Remote Sensing Science Institute of Remote Sensing and Digital EarthChinese Academy of SciencesBeijing 100101China AI for Earth Laboratory Cross-Strait InstituteTsinghua UniversityBeijing 100084China International Institute for Earth System Sciences Nanjing UniversityNanjing 210093China Research Center for Ecology and Environment of Central Asia Chinese Academy of SciencesUrumchi 830011China Key Laboratory of Forest Ecology and Management Institute of Applied EcologyChinese Academy of SciencesShenyang 110016China National Engineering Laboratory for Applied Technology in Forestry&Ecology in South China College of Life Science and TechnologyCentral South University of Forestry and TechnologyChangsha 410004China College of Surveying&Geo-Informatics Tongji UniversityShanghai 200092China Department of Urban Planning College of Architecture and Urban PlanningTongji UniversityShanghai 200092China Beijing Institute of Urban Planning Beijing 100045China Department of Urban Planning School of Urban DesignWuhan UniversityWuhan 430072China College of Earth Sciences Jilin UniversityChangchun 130061China Research Center for Digital Mountain and Remote Sensing Application Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610041China Institute of Remote Sensing and Geographic Information System School of Earth and Space SciencesPeking UniversityBeijing 100871China Department of Urban and Regional Planning School of Geography and PlanningSun Yat-sen Univ

Land use reflects human activities on *** land use is the highest level human alteration on Earth,and it is rapidly changing due to population increase and *** areas have widespread effects on local hydrology,climate,biodiversity,and food production[1,2].However,maps,that contain knowledge on the distribution,pattern and composition of various land use types in urban areas,are limited to city *** mapping standard on data sources,methods,land use classification schemes varies from city to city,due to differences in financial input and skills of mapping *** address various national and global environmental challenges caused by urbanization,it is important to have urban land uses at the national and global scales that are derived from the same or consistent data sources with the same or compatible classification systems and mapping *** is because,only with urban land use maps produced with similar criteria,consistent environmental policies can be made,and action efforts can be compared and assessed for large scale environmental ***,despite of the fact that a number of urban-extent maps exist at global scales[3,4],more detailed urban land use maps do not exist at the same *** at big country or regional levels such as for the United states,china and European Union,consistent land use mapping efforts are rare[5,6](e.g.,https://***/open_land_use/).

关键词： EULUC-china 土地利用类型

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Transparent Electrodes: Templateless, Plating-Free Fabrication of Flexible Transparent Electrodes with Embedded Silver Mesh by Electric-Field-Driven Microscale 3D Printing and Hybrid Hot Embossing (Adv. Mater. 21/2021)

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Advanced Materials 2021年第21期33卷

作者： Xiaoyang Zhu Mingyang Liu Ximeng Qi Hongke Li Yuan-Fang Zhang Zhenghao Li Zilong Peng Jianjun Yang Lei Qian Quan Xu Nairui Gou Jiankang He Dichen Li Hongbo Lan Shandong Engineering Research Center for Additive Manufacturing Qingdao University of Technology Qingdao 266520 China Digital Manufacturing and Design Centre Singapore University of Technology and Design Singapore 487372 Singapore College of Engineering The Ohio State University Columbus OH 43210 USA Department of Industrial and Systems Engineering The Hong Kong Polytechnic University Hung Hom Hong Kong 999077 China State Key Laboratory for Manufacturing System Engineering Xi'an Jiaotong University Xi'an 710049 China

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Temperature Field Simulation and Ampacity Calculation of Multi-loop Cable Tunnel with Ventilation

Temperature Field Simulation and Ampacity Calculation of Mul...

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IEEE Advanced Information technology, Electronic and Automation Control Conference (IAEAC)

作者： Luo Chujun Liu Heng Li Jian Yang Hao Yang Fan Si Zhanchao Li Jinxian China Power Engineering Consulting Group Central Southern China Electric Power Design Institute Co. Ltd. Wuhan China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China

The number of cable loops in the tunnel is the main factor that causes the cable temperature rise and limits the cable ampacity. In order to improve the cable ampacity of multi-loop cable tunnel, the electromagnetic - thermal - flow coupling calculation model of cable tunnel was established based on ANSYS finite element simulation software. The influence of tunnel ventilation speed and ventilation distance on cable temperature distribution was studied, and the ampacity was calculated according to temperature distribution. The results show that the temperature of the cable conductor decreases by less than 1°C for each 2m/s increase of wind speed when the speed is more than 6m/s. The larger the wind speed, the smaller the temperature difference of cable conductor between the air inlet and outlet. The longer the ventilation distance, the larger the temperature difference of cable conductor between the air inlet and outlet. The ampacity of 110kV, 220kV and 500kV cables is respectively 1645A, 2031A and 2238A when the wind speed is 6m/s. The ampacity of 110kV, 220kV and 500kV cables is 1141A, 1517A and 1678A respectively when the ventilation length is 4m.

关键词： Power cables Ventilation Conductors Temperature distribution Mathematical model Wind speed Heating systems

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Electromagnetic Safety Assessment of Low-voltage Distribution system Buildings in Thermal Power Plants in Case of Lightning Strike

Electromagnetic Safety Assessment of Low-voltage Distributio...

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IEEE International Conference on Power, Intelligent Computing and systems (ICPICS)

作者： Zhenxing Hu Wei Ding Tao Yang Xiaokang Luo Yaqin Tao Zeliang Shen Southwest Electric Power Design Institute Co. Ltd. Of China Power Engineering Consulting Group Chengdu China State Grid Chongqing Jangbei Power Supply Company Chongqing China The State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China

ISBN: (纸本)9781728137216

The low-voltage distribution system of thermal power plants has a large auxiliary power load and is vulnerable to electromagnetic influence, so its lightning protection is relatively complex. This paper takes Xishui Substation as the research object, and uses CDEGS software to build its buildings and grounding grid model, and calculates the shunt of lightning current in branch conductors, indoor magnetic field distribution and grounding grid potential distribution of thermal power plants when lightning strikes buildings. The results show that the shunt coefficient of the thermal power plant buildings basically meets the specification requirements. The lightning that strikes buildings will not cause harm to indoor equipment near the middle. Lightning flowing through buildings and leaking into the ground will threaten its low-voltage distribution system with ground potential counterattack. This provides data basis for electromagnetic safety assessment of low-voltage distribution system in thermal power plants, and is of great significance for improving reliable operation of low-voltage distribution system in thermal power plants.

关键词： Buildings Lightning Grounding Magnetic fields Power generation Conductors Electromagnetics

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Study of Electromagnetic Influence on the Low-voltage Secondary Cables when Lightning Strikes Thermal Power Plants

Study of Electromagnetic Influence on the Low-voltage Second...

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IEEE International Conference on Power, Intelligent Computing and systems (ICPICS)

作者： Zhenxing Hu Wei Ding Tao Yang Xiaokang Luo Yaqin Tao Zeliang Shen Southwest Electric Power Design Institute Co. Ltd. Of China Power Engineering Consulting Group Chengdu China State Grid Chongqing Jiangbei Power Supply Company Chongqing China The State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China

ISBN: (纸本)9781728137216

When solving the electromagnetic compatibility problem of low-voltage distribution system in thermal power plants, it is found that the current protection specifications for secondary cables in some conventional substations and common civil buildings are not suitable for thermal power plants, and there is a lack of reference standards for lightning protection data of secondary cables in thermal power plants. Therefore, this paper takes Xishui Substation as the research object, uses CDEGS software to build a three-phase low-voltage distribution system combined with the structural characteristics of large-scale ground screen, overhead cable bridge, building group and others of thermal power plants, and completes the modeling of its buildings, grounding grid, transformer and secondary overhead cable bridge. According to the layout of two buildings in the low-voltage distribution system, the overvoltage of the secondary power cable generated when the buildings are struck by lightning is calculated. The results show that the lightning strike will cause great electromagnetic influence on the secondary equipment. This provides data support for the layout design and protection of secondary cables in thermal power plants, and is of great significance for improving the insulation coordination capability of secondary systems.

关键词： Power cables Buildings Lightning Grounding Bridge circuits Electromagnetics Power generation

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Shape-Memory Polymers: Mechanically Robust and UV-Curable Shape-Memory Polymers for Digital Light Processing Based 4D Printing (Adv. Mater. 27/2021)

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Advanced Materials 2021年第27期33卷

作者： Biao Zhang Honggeng Li Jianxiang Cheng Haitao Ye Amir Hosein Sakhaei Chao Yuan Ping Rao Yuan-Fang Zhang Zhe Chen Rong Wang Xiangnan He Ji Liu Rui Xiao Shaoxing Qu Qi Ge Frontiers Science Center for Flexible Electronics (FSCFE) Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials and Engineering (IBME) Northwestern Polytechnical University 127 West Youyi Road Xi'an 710072 China Shenzhen Key Laboratory of Biomimetic Robotics and Intelligent Systems Department of Mechanical and Energy Engineering Southern University of Science and Technology Shenzhen 518055 China Guangdong Provincial Key Laboratory of Human-Augmentation and Rehabilitation Robotics in Universities Southern University of Science and Technology Shenzhen 518055 China School of Engineering and Digital Arts University of Kent Canterbury Kent CT2 7NT UK State Key Laboratory for Strength and Vibration of Mechanical Structures Department of Engineering Mechanics Xi'an Jiaotong University Xi'an 710049 China Department of Mechanics and Aerospace Engineering Southern University of Science and Technology Shenzhen 518055 China Digital Manufacturing and Design Centre Singapore University of Technology and Design Singapore 487372 Singapore State Key Laboratory of Fluid Power and Mechatronic System Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Department of Engineering Mechanics Zhejiang University Hangzhou 310027 China

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Structural design and strength analysis of multi-ring packed flywheel with heavy metal alloy segments

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IOP Conference Series: Materials Science and Engineering 2019年第1期657卷

作者： L Jiang W Zhang C W Wu L P Zhang Y X Zhang Z Y Liu National Key Laboratory of Science and Technology on Reactor System Design Technology Nuclear Power Institute of China Chengdu 610041 China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian 116024 China

Flywheel, as a kinetic energy storage and conversion device, has promising applications due to its high efficiency, no pollution and long lifetime. In particular, with a three-layer structure packed with heavy metal alloy middle layer, a flywheel can achieve both a large rotational inertia and a high energy density. To guarantee structural strength safety of this type of multi-ring packed flywheel operating at high temperature, structural and thermal stress analysis for a flywheel with a tungsten alloy layer sandwiched between two stainless steel layers is carried out using finite element method (FEM). Based on plane stress assumption, flywheel stress characteristic along radius under assembly force, centrifugal force and thermal loading is demonstrated. The results show that, the rise of temperature causes inconsistent thermal expansion between neighbouring layers and results in a large thermal stress. Particularly, a high circumferential tensile stress occurs in the middle layer. It is also found that, the segments of the middle tungsten alloy layer can efficiently relieve the inconsistent thermal expansion and lower the thermal stress. Moreover, the number of segments significantly influences the efficiency of thermal stress releasing and the reserved gap between adjacent segments significantly improves the contact pressure between inner hub and tungsten alloy layer. This work may provide reference for structural design of the multi-ring packed flywheels under thermal loading.

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Noble Metal Dichalcogenides: A Noble Metal Dichalcogenide for High‐Performance Field‐Effect Transistors and Broadband Photodetectors (Adv. Funct. Mater. 5/2020)

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Advanced Functional Materials 2020年第5期30卷

作者： Zhen Wang Peng Wang Fang Wang Jiafu Ye Ting He Feng Wu Meng Peng Peisong Wu Yunfeng Chen Fang Zhong Runzhang Xie Zhuangzhuang Cui Liang Shen Qinghua Zhang Lin Gu Man Luo Yang Wang Huawei Chen Peng Zhou Anlian Pan Xiaohao Zhou Lili Zhang Weida Hu State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China University of Chinese Academy of Sciences Beijing 100049 China Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou 310024 China State Key Laboratory of Integrated Optoelectronics College of Electronic Science and Engineering Jilin University Changchun 130012 China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Jiangsu Key Laboratory of ASIC Design Nantong University Nantong Jiangsu 226019 China State Key Laboratory of ASIC and System Department of Microelectronics Fudan University Shanghai 200433 China Key Laboratory for Micro‐Nano Physics and Technology of Hunan Province College of Materials Science and Engineering Hunan University Changsha 410082 China

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Real-time Estimation of Angular Vibration Motion using Gyroscope for Long Distance Targeting Applications

Real-time Estimation of Angular Vibration Motion using Gyros...

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IEEE International Conference on Robotics and Biomimetics

作者： Yichang He Yunfeng Fan Dingguo Zhang U-Xuan Tan Pillar of Engineering Product Development Singapore University of Technology and Design Singapore State Key Laboratory of Mechanical System and Vibration Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9781728103785;9781728103778

Sensing angular vibration motion using only self-referencing sensors has been gaining interest in various mobile applications. An example is long distance communication and tracking tasks on motorized vehicles. There is a lack of availability of infrastructure and externally referenced sensors like position sensitive detectors are not suitable. Hence, such applications can only rely on self-referencing sensors. Gyroscope is a good candidate for such applications. However, the drawback of gyroscope is the drift after integration. Most of the conventional filtering techniques introduce phase difference and is not ideal for real-time compensation applications. Several novel band-pass that do not introduce phase difference have since been introduced. However, such zero-phase band-pass filter works well for the velocity domain, but not in the displacement whereby there is significant drift after the numerical integration. To address this, a near zero-phase filtering algorithm is proposed. The proposed method first filter the drift or voluntary motion signal in the low frequency domain with recursive least square (RLS) based adaptive modeling. Weighted Fourier linear combiner (WFLC) is then used as zero-phase band-pass filter to estimate the angular displacement. Real experimental data is collected and the results demonstrated that the proposed method out-performs several other filtering techniques.

关键词： Sensors Band-pass filters Adaptation models Vibrations Gyroscopes Filtering algorithms Real-time systems

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