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Enhancement of shear stability of a Fe-based amorphous alloy using electrodeposited Ni layers

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Journal of Materials Science & Technology 2018年第12期34卷 2283-2289页

作者： y.c.wang X.M.Luo L.J.chen H.W.yang B.Zhang G.P.Zhang School of Materials Science and Engineering Shenyang University of Technology Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of Sciences Key Laboratory for Anisotropy and Texture of Materials Ministry of EducationSchool of Materials Science and EngineeringNortheastern University

Tensile and fracture behaviors of sandwich-structured composites consisting of a Fe-based amorphous layer with a constant thickness and ultrafine-grained Ni layers with different thicknesses were investigated. The results indicate that the initiation and the stable propagation of the shear band in the amorphous layer was dominated by the Ni layers due to their strong constraint role. The catastrophic fracture of the amorphous layer was postponed in the sandwich composites through properly increasing the constrained Ni layer thickness, which effectively decreased the shear stress on the shear fracture planes of the amorphous layer, and thus led to stable propagation of the primary SB characterized by the increase in the smooth region size of the shear band.

关键词： Sandwich-structured composites Amorphous alloy Shear stability Plasticity Fracture

Solid-state alloying of Al-Mg alloys by accumulative roll-bonding:Microstructure and properties

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Journal of Materials Science & Technology 2022年第30期125卷 238-251页

作者： X.M.Mei Q.S.Mei J.y.Li c.L.Li L.Wan F.chen Z.H.chen T.Xu y.c.wang y.y.Tan School of Power and Mechanical Engineering Wuhan UniversityWuhan 430072China Key Laboratory of Hydraulic Machinery Transients(Wuhan University) Ministry of EducationWuhan 430072China School of Mechanical Engineering Wuhan Polytechnic UniversityWuhan 430023China

In this study,a novel solid-state alloying approach was adopted to fabricate Al-Mg alloys with high Mg contents(c_(Mg)) by accumulative roll-bonding(ARB)of Al and Mg elemental materials to ultrahigh *** results showed that the degree of alloying increased with the increase of ARB cycles and a supersaturatedα-Al solid solution accompanied with nanoprecipitates was formed in the Al-Mg alloys by ARB to 70 *** as-prepared Al-Mg alloys exhibited enhanced mechanical properties,with a maximum tensile strength of∼615 MPa and a tensile elongation of∼10%at c_(Mg)=13 wt.%.The high strength can be attributed to different mechanisms,namely solid solution strengthening,grain boundary strengthening,dislocation strengthening,and precipitation *** Al-Mg alloys showed increased work hardening with increasing c_(Mg),due to the enhanced formation of ***,no obvious drop in the intergranular corrosion(IGc)resistance was found in the Al-Mg alloys with c_(Mg) up to 13 wt.%.Moreover,sensitization treatment was found to induce little decrease in the IGc resistance of the Al-Mg alloys with c_(Mg)≤13 wt.%.We found that the excellent IGc resistance was due to the suppression of grain boundary precipitation by the preferred formation of precipitates within the grains that were induced by *** study indicated the novelty of the present solid-state alloying approach to achieving a superior combination of high mechanical properties and IGc resistance in Al-Mg alloys.

关键词： Solid-state alloying Al-Mg alloys Mechanical properties IGc resistance ARB

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超薄膨胀型钢结构防火涂层的耐湿热性能

建筑材料学报 2011年第1期14卷 36-40页

作者：王玲玲李国强 y.c.wang 同济大学土木工程学院上海200092 曼彻斯特大学土木、力学与航空学院曼彻斯特M139PL

为考察超薄膨胀型钢结构防火涂层的防火隔热性能在某一特定环境下随使用时间的变化规律,对36个试件进行了人工加速老化试验和隔热性能试验.结果表明:高湿度环境下,涂层阻燃体系中的亲水性物质(如APP)会迁移到涂层表面而被溶解,使阻燃体... 详细信息

为考察超薄膨胀型钢结构防火涂层的防火隔热性能在某一特定环境下随使用时间的变化规律,对36个试件进行了人工加速老化试验和隔热性能试验.结果表明:高湿度环境下,涂层阻燃体系中的亲水性物质(如APP)会迁移到涂层表面而被溶解,使阻燃体系的组分和配比发生变化,导致高温下阻燃体系的膨胀受阻,从而影响到膨胀倍率和膨胀层内部结构,最终导致膨胀层等效导热系数变大;1,2 mm涂层试件的等效导热系数随老化时间总体上呈现出相同的变化规律,与0次循环试件相比,2,4次循环试件涂层的λ仅增大了1.0%左右,21次循环试件涂层的λ增大了30.0%,与21次循环试件相比,42次循环试件涂层的λ仅增大了3.0%左右,表明经过21次循环以后,涂层已达到一个稳定状态.

关键词：超薄膨胀型钢结构防火涂层老化隔热性能人工加速老化试验等效导热系数

THERMAL STRUcTURAL DISORDER AND MELTING TRANSITION IN HIGH-ANGLE GRAIN-BOUNDARy: A MOLEcULAR-DyNAMIcS STUDy

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Acta Metallurgica Sinica(English Letters) 1998年第5期11卷 365-375页

作者： S.J.Zhao y.c.wang J.Q.you Q.B.yang L.G.Zhou H.Q.ye Xiangtan Univ Xiangtan China

A structural transition in the fcc ∑=5 (120)/[001] high-angle tilt grain-boundary(GB)is investigated by molecular-dynamics simulation. The calculations have been performed at various temperutures and the thermodynamic melting point Tm of the model system is determined by using a many-body potential fitted to copper. A thermal disorder transition in the GB region occurs well below the melting point. Our results indicate that such a transition is a continuous process and there is no evidence of premelting, which is entirely in accord with experiment results and theoretical *** we also observed that melting initiated at the interface and then propagated into the bulk quickly at or above Tm.

关键词： moleculandynamics grainboundary structural transition

模拟引潮力作用下岩石破坏前兆的实验研究——加卸载响应比(LURR)理论和能量加速释放(AER)

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岩石力学与工程学报 2005年第17期24卷 3172-3179页

作者：张晖辉尹祥础梁乃刚李世愚余怀忠 y.c.wang c.yin Victor Kukshenko Nikita Tomiline Surguei Elizarov 中国科学院力学研究所非线性力学国家重点实验室中国地震局地球物理研究所北京100081 昆士兰大学QUAKES地球科学系俄罗斯科学院Ioffe物理技术研究所 Interunis公司

大地震前加卸载响应比升高和能量加速释放这2种现象可以用来对地震进行中期预报。同时,加卸载响应比升高和能量加速释放有相同的物理机制。实验对于揭示地壳岩石的变形和破坏规律是非常重要的。在三轴应力条件下进行了岩石破坏声发射实... 详细信息

大地震前加卸载响应比升高和能量加速释放这2种现象可以用来对地震进行中期预报。同时,加卸载响应比升高和能量加速释放有相同的物理机制。实验对于揭示地壳岩石的变形和破坏规律是非常重要的。在三轴应力条件下进行了岩石破坏声发射实验,声发射技术是研究岩石变形破坏微观机理的重要手段。为了模拟日月引潮力对地球的加载和卸载作用,在一常数加载率的轴向压力作用下,叠加上微小的正弦扰动,力求能够模拟地下岩石复杂的受力状态。实验过程中记录到大量的声发射信息,声发射记录包括声发射发生的时间、空间坐标和振幅,它能够反映岩石试件内部每一个损伤(微裂纹)发生的时间、地点和强度。利用声发射记录系统地分析了岩石试件破坏前能量释放及加卸载响应比的演化情况,结果显示,岩石试件宏观破坏前出现了能量加速释放及加卸载响应比剧增这2种前兆现象,从而对地震临界点理论给予了实验支持,同时也为地震预测提供了实验依据。

关键词：岩石力学加卸载响应比能量加速释放声发射循环载荷临界点理论

应用BOLD MRI无创性评价小鼠不同程度心肌梗死模型肾缺氧情况试验性研究

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国际医学放射学杂志 2018年第2期 215-216页

作者： D.chang y.c.wang T.T.Xu X.G.Peng y.cai L.wang 俞翔 Jiangsu Key Laboratory of Molecular and Functional Imaging Department of Radiology Zhongda Hospital Medical School of Southeast University

摘要目的评价应用血氧水平依赖(BOLD)MRI测量小鼠不同程度心肌梗死(MI)后肾脏氧合能力的可行性。材料与方法本研究经当地动物伦理委员会批准。对189只雄性

关键词： BOLD MRI MI 不同程度 MRI 手术组无创性

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冷弯薄壁钢短柱在均匀高温下的性能

建筑钢结构进展 2004年第3期6卷 37-44页

作者： M.Feng y.c.wang J.M.Davis 周宏宇 Manchester School of Engineering The University of Manchester 同济大学

本篇文章对常温及均匀高温条件下的冷成型薄壁短槽钢的轴向强度进行了初步研究。对常温及均匀高温下的一系列卷边的或非卷边的槽钢进行了试验研究。应用一系列的设计方法和商业化的有限元软件ABAQUS( 1998)对试验进行了分析。本文中涉... 详细信息

本篇文章对常温及均匀高温条件下的冷成型薄壁短槽钢的轴向强度进行了初步研究。对常温及均匀高温下的一系列卷边的或非卷边的槽钢进行了试验研究。应用一系列的设计方法和商业化的有限元软件ABAQUS( 1998)对试验进行了分析。本文中涉及的设计方法包括 :英国规范BS5 95 0 ( 1987)、欧洲规范Eurocode 3Part1.3 (cEN1996)和美国规范AISI( 1996) ,在有限元分析中 ,考虑了几何非线性和材料非线性。高温下钢材的应力 -应变曲线根据欧洲规范Eurocode 3Part 1.2(cEN1995 )和Qutinen ( 2 0 0 1)采用。在某些试验中发现扭转屈曲 ,为了扩展针对这种破坏模式的设计方法 ,在这些规范中引用了yong和Hancock( 1992 )考虑扭转屈曲的方法。对设计规范BS5 95 0Part 5 ( 1987)、欧洲规范Eurocode 3Part 1.3(cEN1996)和美国规范AISI( 1996)中常温下薄壁柱的设计方法加以修改 ,来考虑钢材高温下的强度和刚度的变化。从试验结果、规范预期的结果和数值分析的比较可见。

关键词：冷弯薄壁钢短柱扭转屈曲有效宽度极限荷载高温试验

Mechanism of Primary Frequency Regulation for Battery Hybridization in Hydropower Plant

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cSEE Journal of Power and Energy Systems 2024年第5期10卷 2127-2137页

作者： yiwen Liao Weijia yang Zhecheng wang yifan Huang c.y.chung State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan UniversityWuhan 430072China Department of Electrical Engineering The Hong Kong Polytechnic UniversityHong KongChina

Battery hybridization in hydropower plants is a hydropower flexibility enhancement technology innovation that can potentially expand hydropower’s contributions to the grid,but its fundamental characteristics and influencing mechanisms are still *** this paper,primary frequency regulation(PFR)performance and the mechanism of this new technology are studied.A battery hybridized hydropower plant(BH-HPP)model,based on a field-measured-data-based hydropower plant(HPP)model and a verified battery simplified model,is *** of system stability and dynamics is undertaken for three different battery control strategies by root locus and participation factor *** to conventional HPPs,analysis results theoretically reveal BH-HPP can not only accelerate system regulation rapidity but also effectively enlarge HPP stability region during PFR *** domain simulation verifies the results and further shows synthetic control has better performance among introduced ***,initial design ranges of control parameters considering battery capacity and a renewable energy source scenario case are also *** work could provide theoretical support for flexibility enhancement solutions for hydropower systems.

关键词： Battery hybridization dynamic response hydropower plant primary frequency regulation stability

Investigations of nuclear chirality at iThemba LABS

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Frontiers of physics 2024年第2期19卷 7-38页

作者： R.A.Bark E.A.Lawrie c.Liu S.y.wang iThemba Laboratory for Accelerator Based Sciences National Research FoundationP.O.Box 722Somerset-West 7129South Africa Department of Physics University of the Western CapePrivate Bag X177535BellvilleSouth Africa Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment Institute of Space SciencesShandong UniversityWeihai 264209China

Progress in the studies of chirality in atomic nuclei at iThemba LABS is *** regions of chirality,around mass 80 and 190 have been discovered using the AFRODITE array,specifically in the nuclei^(74)As,^(78,80,82)Br,^(81)Kr,and^(193,194,198)*** phenomena have been observed,including multiple chiral bands in the same nucleus,the coexistence of octupole correlations and nuclear chirality,and the coexistence of pseudo spin and nuclear *** best example of chiral degeneracy to date was found in ^(194)*** level scheme of ^(106)Ag has been revisited and interpreted in terms of two-and four-quasiparticle *** using the particle-rotor model have shown that the fingerprints of chirality in the two-quasiparticle system only can occur in an idealised model *** systems with a higher number of quasiparticles,the calculations showed that nuclear chirality can persist.

关键词： chirality high-spin states particle-rotor model