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Study on the Basic Mechanical Behaviors of High Density Polyethylene Electrofusion Welded Joints at Different Temperature

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Journal of materials science & Technology 2003年第6期19卷 603-606页

作者： lixing huo, Fangjuan QI, yufeng ZHANG, hongyang jing and Xinqi YANGSchool of materials science and eng.neering, tianjin university, tianjin 300072, china Sch. of Mat. Sci. and eng. Tianjin Univ. Tianjin 300072 China

The basic mechanical behaviors of high density polyethylene electrofusion welded joint at different temperatures were studied by using differently designed specimens in this paper. The results show that the strength of weld bonding plane is higher than that of the pipe and socket materials at room temperature. In order to get the shear strength of electrofusion welded joint, the effective bond lengths were reduced by cutting artificial groove through the socket. The effective bonding length of welded joint to get the shear strength is decreased with decreasing testing temperature. The shear strength and the sensibility to sharp notch of HDPE material increased with decreasing temperature.

关键词： Basic mechanical behaviors High density polyethylene Electrofusion welded joint

New Developed Welding Electrode for Improving the Fatigue Strength of Welded Joints

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Journal of materials science & Technology 2002年第6期18卷 527-531页

作者： Wenxian WANG, lixing huo, yufeng ZHANG, Dongpo WANG and hongyang jingCollege of Material science and eng.neering, tianjin university, tianjin 300072, china Coll. of Mat. Sci. and eng. Tianjin Univ. Tianjin 300072 China

A new welding electrode, low transformation temperature electrode (LTTE), was introduced in this paper. It was described in design principle, mechanics, chemical compositions of their deposited metal and manufacturing methods. It was proved that the best transformation starting temperature from austenite to martensite of the deposited metal of LTTE was at about 191℃ and it was obtained by adding alloying elements such as Cr, Ni, Mn and Mo. The microstructure of the weld metal of the LTTE was low carbon martensite and residual austenite. The compressive residual stress was induced around the weld of the LTTE and the -145 MPa in compression could be obtained in middle of weld metal. The fatigue tests showed that the fatigue strength of the longitudinal welded joints welded with the LTTE at 2×106 cycles was improved by 59% compared with that of the same type of welded joints welded with conventional E5015 and the fatigue life was increased by 47 times at 162 MPa. It is a very valuable method to improve the fatigue performance of welded joints.

关键词： Low transformation temperature electrode Compressive residual stress Fatigue strength Welded joints

Highly efficient and stable electrocatalyst for hydrogen evolution by molybdenum doped Ni-Co phosphide nanoneedles at high current density

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Nano Research 2024年第3期17卷 1066-1074页

作者： Chengyu Huang Zhonghong Xia jing Wang jing Zhang Chenfei Zhao Xingli Zou Shichun Mu Jiujun Zhang Xionggang Lu Hong Jin Fan Shengjuan huo yufeng Zhao College of sciences&Institute for Sustainable Energy Shanghai UniversityShanghai 200444China State Key Laboratory of Metastable materials science and Technology Hebei Key Laboratory of Heavy Metal Deep-Remediation in Water and Resource ReuseYanshan UniversityQinhuangdao 066004China State Key Laboratory of Advanced Special Steel and Shanghai Key Laboratory of Advanced Ferrometallurgy School of Materials Science and EngineeringShanghai UniversityShanghai 200444China State Key Laboratory of Advanced Technology for materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China School of Physical and Mathematical sciences Nanyang Technological UniversitySingapore639798

There is an increasingly urgent need to develop cost-effective electrocatalysts with high catalytic activity and stability as alternatives to the traditional Pt/C in catalysts in water *** this study,microspheres composed of Mo-doped NiCoP nanoneedles supported on nickel foam were prepared to address this *** results show that the nanoneedles provide sufficient active sites for efficient electron transfer;the small-sized effect and the micro-scale roughness enhance the entry of reactants and the release of hydrogen bubbles;the Mo doping effectively improves the electrocatalytic performance of NiCoP in alkaline *** catalyst exhibits low hydrogen evolution overpotentials of 38.5 and 217.5 mV at a current density of 10 mA·cm^(-2) and high current density of 500 mA·cm^(-2),respectively,and only 1.978 V is required to achieve a current density of 1000 mA·cm^(-2) for overall water *** functional theory(DFT)calculations show that the improved hydrogen evolution performance can be explained as a result of the Mo doping,which serves to reduce the interaction between NiCoP and intermediates,optimize the Gibbs free energy of hydrogen adsorption(△G_(*H)),and accelerate the desorption rate of **** study provides a promising solution to the ongoing challenge of designing efficient electrocatalysts for high-current-density hydrogen production.

关键词： transition metal phosphides Mo-doped NiCoP hydrogen evolution reaction gradient hydrothermal water splitting

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复合钢管强度设计准则

天津大学学报 1996年第1期29卷 138-141页

作者：荆洪阳霍立兴张玉凤

采用“混合原则”（ｌａｗｏｆｍｉｘｔｕｒｅ）分析复合钢管中内层防腐材料对复合钢管强度的影响，提出新的复合钢管强度设计准则，并采用蒙特卡罗方法证明了其在管线强度设计中应用的可靠性．

关键词：复合钢管强度可靠性

Application of the local approach to the fatigue assessment for welded joints

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china Welding 2003年第2期12卷 116-121页

作者：王东坡张玉凤霍立兴陈俊梅王文先 College of materials science and eng.neering Tianjin University Tianjin 300072

The fatigue behavior of welded structures is currently determined by means of recommendations defined in terms of S-N curve corresponding to the detail classes of welded joints without taking account of the actual geometry of the weld. A new fatigue strength assessment method based on Dang Van multiaxial fatigue limit criterion was introduced, which is named the local approach and presented by Institut de Soudure recently. The local approach has advantages in taking welding residual stresses and the geometry of the weld toe and weld root into consideration. The application of the local approach to the fatigue strength assessment of low carbon steel Q235B welded joints was studied. The fatigue tests and finite element analysis results show that the local approach parameters recommended by Institut de Soudure were incorrectly for low carbon steel Q235B welded joints. With aluminum alloy welded joints being used widely, the parameters of the local approach used for aluminum alloy welded joints were obtained and verified on bases of the fatigue tests and finite element analysis.

关键词： fatigue strength local approach local stresses residual stresses

Microstructure and fatigue crack growth behaviour of electron beam welding in 30CrMnSiNi2A steel

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china Welding 2003年第2期12卷 128-132页

作者：陈芙蓉霍立兴张玉凤张莉刘方军陈刚 College of Material science and eng.neering Tianjin University Tianjin 300072 Aviation Technique Institute of Beijing Beijing 100024

The effects of two post-weld heat treatment processes on the microstructure and fatigue properties of the electron beam welded joints of 30CrMnSiNi2A steel were studied. Electron beam local post-weld heat treatment (EBLPWHT), in a vacuum chamber, immediately after welding and a traditional furnace whole post-weld heat treatment (FWPWHT) were accepted. The experimental results show that, after EBLPWHT, the main microstructure of weld is changed from coarse acicular martensite into lath martensite, and base metal is changed from ferrite and perlite into upper bainite and residual austenite, however the microstructures of different zones of joints in FWPWHT conditions are tempered sorbite. The fatigue crack growth rate da/dN of welds and base metal are not obviously changed among EBLPWHT, FWPWHT test and as-welded (AW) test, as the mechanical properties of materials have a certain but not large effect on the da/dN of welded joints. The resistance to near threshold fatigue crack growth data of welded joints can be largely improved by EBLPWHT and it is related to microstructure and crack closure effect.

关键词： electron beam local heat treatment electron beam welding microstructure fatigue properties

Inheritance factor on the physical properties in metallic glasses

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materials Futures 2022年第3期1卷 185-194页

作者： Weiming Yang Jiawei Li hongyang Li Haishun Liu Jinyong Mo Si Lan Maozhi Li xun-Li Wang Jürgen Eckert Juntao huo School of Mechanics and Civil eng.neering State Key Laboratory for Geomechanics and Deep Underground EngineeringChina University of Mining and TechnologyXuzhou 221116People’s Republic of China CAS Key Laboratory of Magnetic materials and Devices Zhejiang Province Key Laboratory of Magnetic Materials and Application TechnologyNingbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingboZhejiang 315201People’s Republic of China School of materials and Physics China University of Mining and TechnologyXuzhou 221116People’s Republic of China Herbert Gleiter Institute of Nanoscience Nanjing University of Science and Technology200 Xiaolingwei AvenueNanjing 210094People’s Republic of China Department of Physics City University of Hong Kong83 Tat Chee AvenueHong KongPeople’s Republic of China Department of Physics Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano DevicesRenmin University of ChinaBeijing 100872People’s Republic of China Center for Neutron Scattering City University of Hong Kong Shenzhen Research Institute8 Yuexing 1st RoadShenzhen Hi-Tech Industrial ParkShenzhen 518057People’s Republic of China Erich Schmid Institute of materials science Austrian Academy of Science8700 LeobenAustria Department of materials science Chair of Materials PhysicsMontanuniversität Leoben8700 LeobenAustria

Material genetic eng.neering can significantly accelerate the development of new *** an important topic in material science and condensed matter physics,the development of metallic glasses(MGs)with specific properties has largely been the result of trial and error since their discovery in ***,property design based on the physical parameters of constituent elements of MGs remains a huge challenge owing to the lack of an understanding of the property inheritance from constitute elements to the resultant *** this work,we report the inherent relationships of the yield strengthσ_(y),Young’s modulus E,and shear Modulus G with the valence electron *** importantly,we reveal that the electronic density of states(EDOSs)at the Fermi surface(E_(F))is an inheritance factor for the physical properties of *** physical properties of MGs are inherited from the specific element with the largest coefficient of electronic specific heat(γ_(i)),which dominates the value of the EDOS at E_(F).This work not only contributes to the understanding of property inheritances but also guides the design of novel MGs with specific properties based on material genetic eng.neering.

关键词： metallic glasses inheritance factor mechanical properties electronic density of state

CEPC Technical Design Report

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Radiation Detection Technology and Methods 2024年第1期8卷 I0003-I0016,1-1091页

作者： Waleed Abdallah Tiago Carlos Adorno de Freitas Konstantin Afanaciev Shakeel Ahmad Ijaz Ahmed Xiaocong Ai Abid Aleem Wolfgang Altmannshofer Fabio Alves Weiming An Rui An Daniele Paolo Anderle Stefan Antusch Yasuo Arai Andrej Arbuzov Abdesslam Arhrib Mustafa Ashry Sha Bai Yu Bai Yang Bai Vipul Bairathi Csaba Balazs Philip Bambade Yong Ban Tripamo Bandyopadhyay Shou-Shan Bao Desmond P.Barber Ayse Bat Varvara Batozskaya Subash Chandra Behera Alexander Belyaev Michele Bertucci Xiao-Jun Bi Yuanjie Bi Tianjian Bian Fabrizio Bianchi Thomas Biekotter Michela Biglietti Shalva Bilanishvili Deng Binglin Denis Bodrov Anton Bogomyagkov Serge Bondarenko Stewart Boogert Maarten Boonekamp Marcello Borri Angelo Bosotti Vincent Boudry Mohammed Boukidi Igor Boyko Ivanka Bozovic Giuseppe Bozzi Jean-Claude Brient Anastasiia Budzinskaya Masroor Bukhari Vladimir Bytev Giacomo Cacciapaglia Hua Cai Wenyong Cai Wujun Cai Yijian Cai Yizhou Cai Yuchen Cai Haiying Cai Huacheng Cai Lorenzo Calibbi Junsong Cang Guofu Cao Jianshe Cao Antoine Chance xuejun Chang Yue Chang Zhe Chang Xinyuan Chang Wei Chao Auttakit Chatrabhuti Yimin Che Yuzhi Che Bin Chen Danping Chen Fuqing Chen Fusan Chen Gang Chen Guoming Chen Hua-Xing Chen Huirun Chen Jinhui Chen Ji-Yuan Chen Kai Chen Mali Chen Mingjun Chen Mingshui Chen Ning Chen Shanhong Chen Shanzhen Chen Shao-Long Chen Shaomin Chen Shiqiang Chen Tianlu Chen Wei Chen Xiang Chen Xiaoyu Chen Xin Chen xun Chen xurong Chen Ye Chen Ying Chen Yukai Chen Zelin Chen Zilin Chen Gang Chen Boping Chen Chunhui Chen Hok Chuen Cheng Huajie Cheng Shan Cheng Tongguang Cheng Yunlong Chi Pietro Chimenti Wen Han Chiu Guk Cho Ming-Chung Chu Xiaotong Chu Ziliang Chu Guglielmo Coloretti Andreas Crivellin Hanhua Cui Xiaohao Cui Zhaoyuan Cui Brunella D'Anzi Ling-Yun Dai Xinchen Dai xuwen Dai Antonio De Maria Nicola De Filippis Christophe De La Taille Francesca De Mori Chiara De Sio Elisa Del Core Shuangxue Deng Wei-Tian Deng Zhi Deng Ziyan Deng Bhupal Dev Tang Dewen Biagio Di Micco Ran Ding Siqin Dingl Yadong Ding Haiyi Dong Jianin AGH university of science and Technology Faculty of Physics and Applied Computer ScienceKrakow Anhui university HefeiAnhui Applied Physics Department Federal Urdu University of ArtsScience and TechnologyIslamabad Banaras Hindu university Institute of ScienceVaranasi Bandirma Onyedi Eylul university Bandirma Beihang university Beijing Beijing Computational science Research Center Beijing Beijing Conveyi LTD Beijing Beijing Glass Research Institute Co. LtdBeijing Beijing Institute of Technology Beijing Beijing Normal university Beijing Brown university ProvidenceRI Budker Institute of Nuclear Physics Novosibirsk Cadi Ayyad university Laboratory of Fundamental and Applied PhysicsPolydisciplinary FacultyMarrakech Cairo university Giza Center for Theory and Computation National Tsing Hua UniversityHsinchu Central china Normal university WuhanHubei Central South university ChangshaHunan Centro de Fisica Teorica de Particulas Universidade Tecnica de LisboaLisboa Chengdu KaitengSifang Digital Radio&TV Equipment Co. LtdChengduSichuan china academy of eng.neering physics MianyangSichuan china building materials academy Beijing china Center of Advanced science and Technology Beijing china Institute of Atomic Energy Beijing china Jiliang university HangzhouZhejiang china Nuclear Instrument CO. LTDBeijing china university of Geosciences Beijing china university of Geosciences WuhanHubei china university of Mining and Technology XuzhouJiangsu china West Normal university NanchongSichuan Chongqing university Department of PhysicsChongqing Chulalongkorn university Bangkok City university of Hong Kong Department of PhysicsHong Kong Cockcroft Institute Daresbury Cornell university IthacaNY CPPM(AMU/IPhU&CNRS/INP) Marseille Dalian Minzu university DalianLiaoning Dalian university of Technology Department of PhysicsDalian Deutsches Elektronen-Synchrotron DESY Hamburg Dzhelepov Laboratory of Nuclear Problems of Joint Institute for Nuclear Research(DLNP JINR) Dubna East china university Of science And Technol

The Circular Electron Positron Collider(CEPC)is a large scientific project initiated and hosted by china,fostered through extensive collaboration with international *** complex comprises four accelerators:a 30 GeV Linac,a 1.1 GeV Damping Ring,a Booster capable of achieving energies up to 180 GeV,and a Collider operating at varying energy modes(Z,W,H,and tt).The Linac and Damping Ring are situated on the surface,while the subterranean Booster and Collider are housed in a 100 km circumference underground tunnel,strategically accommodating future expansion with provisions for a potential Super Proton Proton Collider(SPPC).The CEPC primarily serves as a Higgs *** its baseline design with synchrotron radiation(SR)power of 30 MW per beam,it can achieve a luminosity of 5×10^(34)cm^(-2)s^(-1)per interaction point(IP),resulting in an integrated luminosity of 13 ab^(-1)for two IPs over a decade,producing 2.6 million Higgs *** the SR power to 50 MW per beam expands the CEPC's capability to generate 4.3 million Higgs bosons,facilitating precise measurements of Higgs coupling at sub-percent levels,exceeding the precision expected from the HL-LHC by an order of *** Technical Design Report(TDR)follows the Preliminary Conceptual Design Report(Pre-CDR,2015)and the Conceptual Design Report(CDR,2018),comprehensively detailing the machine's layout,performance metrics,physical design and analysis,technical systems design,R&D and prototyping efforts,and associated civil eng.neering ***,it includes a cost estimate and a preliminary construction timeline,establishing a framework for forthcoming eng.neering design phase and site selection *** is anticipated to begin around 2027-2028,pending government approval,with an estimated duration of 8 *** commencement of experiments and data collection could potentially be initiated in the mid-2030s.

关键词： initiated exceeding precise

基于顶空气相色谱-离子迁移谱对不同品种猕猴桃果汁的香气指纹表征

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食品与发酵工业 2023年第1期49卷 279-287页

作者：田真张萌王银刘永萍岳田利霍羽佳西北大学食品科学与工程学院陕西西安710069 山东海能科学仪器有限公司济南山东251500

以美味、中华和软枣3大种系8种猕猴桃为原料,通过测定基础理化指标,结合顶空气相离子迁移谱(headspace-gas chromatography-ion mobility spectrometry,HS-GC-IMS)与描述性感官分析(descriptive sensory analysis,DSA),探究了不同品种猕猴桃汁的理化品质特性和优势香气组分。结果表明,美味猕猴桃中亚特的糖酸比、翠香的维生素C含量均显著高于其他品种;HS-GC-IMS共定性出64种挥发性成分,包括酯类23种,醛类19种,酮类9种,醇类10种,萜烯类1种,其他类2种;美味猕猴桃汁中优势香气组分为酯类,以己酸甲酯、丙酸乙酯、丁酸乙酯、乙酸丁酯、2-甲基丙酸乙酯、2-甲基丁酸乙酯为主,中华猕猴桃中金艳的香气特征与美味猕猴桃比较接近,软枣猕猴桃果汁中优势香气组分主要为酮醇类,2-甲基丁醇、3-甲基丁醇(二聚体)、乙偶姻单体及二聚体为关键香气物质;DSA表明,样品中青草香、水果香、酸味的得分偏高,其中亚特的甜味、水果香丰富,红阳的酸度、辛辣度、柑橘香、青草香突出,龙成二号的烟熏味明显。综上,HS-GC-IMS结合DSA可以实现对不同品种猕猴桃果汁的识别鉴定。

关键词：猕猴桃果汁顶空气相色谱-离子迁移谱香气表征描述性感官分析