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Molecular dynamics study on mechanical behaviors of Ti/Ni nanolaminate with a pre-existing void

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Nano Materials Science 2022年第2期4卷 113-125页

作者： Mengjia Su Qiong Deng Lanting Liu Lianyang Chen He He yinggang miao Joint International Research Laboratory of Impact Dynamics and Its Engineering Applications School of AeronauticsNorthwestern Polytechnical UniversityXi'anShaanxi 710072China

Metallic nanolaminated materials possess excellent mechanical properties due to their unique modulation structures and interfacial ***,how microdefects affect their mechanical properties is still *** evaluate the influences of void location(in the crystalline layer and the Ti/Ni interface),void diameter(d)and thickness of the intermediate layer(h)on overall tensile behaviors,various types of defective Ti/Ni nanolaminates with pre-existing void are established by the molecular dynamics method in this *** results indicate that the strength and plastic deformation mechanisms are strongly dependent on those *** stresses of Ti/Ni nanolaminates decrease distinctly with increasing void diameter,while peak stresses with a void in the crystalline layer decrease with increasing d/*** void locations lead eventually to disparate initial plastic deformation carriers around the void,and various evolutions in the microstructure of the defective Ti/Ni *** Ti/Ni interface plays a significant role in the tensile *** semi-coherent interface impedes new grains and lattice dislocations from passing across the interface,while the incoherent interface facilitates dislocations generating and sliding along the interface,and absorbs the dislocations moving to the *** results also indicate that the strain rate significantly affects the evolution of the microstructure and the tensile properties of defective Ti/Ni nanolaminates.

关键词： Defective Ti/Ni nanolaminate Pre-existing void Interface Tensile behaviors Molecular dynamics

Mechanical behavior of nanorubber reinforced epoxy over a wide strain rate loading

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航空轮胎用橡胶弹性体Mullins效应动态加载方法

纳米材料科学 2024年第1期 106页

作者： yinggang miao Jianping Yin Wenxuan Du Lianyang Chen

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国防科技大学学报 2023年第4期45卷 109-114页

作者：苗应刚殷建平杜文轩西北工业大学航空学院陕西西安710072

航空轮胎用橡胶弹性体在服役过程中遭受严苛的动态循环工况。为了研究弹性体在此工况下的力学响应特征和损伤机理,提出基于应力波作用的Mullins效应动态加载实验方法。根据应力波传导与作用特征,采用Hopkinson压杆加载思路,设计和配置... 详细信息

航空轮胎用橡胶弹性体在服役过程中遭受严苛的动态循环工况。为了研究弹性体在此工况下的力学响应特征和损伤机理,提出基于应力波作用的Mullins效应动态加载实验方法。根据应力波传导与作用特征,采用Hopkinson压杆加载思路,设计和配置了各单元尺寸参数,进而搭建可用于橡胶弹性体材料动态循环加载的实验系统,并开展了航空轮胎用丁苯橡胶的动态循环加载试验。基于试验信号分析发现:加载系统实现了弹性体材料Mullins效应动态应变递增的试验加载。最后开展加载测试参数的影响因素分析,结果表明通过优化系统各单元可实现Mullins效应的动态加、卸载参数的控制。

关键词：动态加载应力波弹性体 Mullins效应 Hopkinson杆

Ultrahigh performance passive radiative cooling by hybrid polar dielectric metasurface thermal emitters

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Opto-Electronic Advances 2024年第4期7卷 17-25页

作者： Yinan Zhang yinggang Chen Tong Wang Qian Zhu Min Gu Institute of Photonic Chips University of Shanghai for Science and TechnologyShanghai 200093China Centre for Artificial-Intelligence Nanophotonics School of Optical-Electrical and Computer EngineeringUniversity of Shanghai for Science and TechnologyShanghai 200093China

Real-world passive radiative cooling requires highly emissive,selective,and omnidirectional thermal emitters to maintain the radiative cooler at a certain temperature below the ambient temperature while maximizing the net cooling *** various selective thermal emitters have been demonstrated,it is still challenging to achieve these conditions sim-ultaneously because of the extreme difficulty in controlling thermal emission of photonic structures in *** we demonstrated hybrid polar dielectric metasurface thermal emitters with machine learning inverse design,en-abling a high emissivity of~0.92 within the atmospheric transparency window 8-13μm,a large spectral selectivity of~1.8 and a wide emission angle up to 80 degrees,*** selective and omnidirectional thermal emitter has led to a new record of temperature reduction as large as~15.4°C under strong solar irradiation of~800 W/m2,signific-antly surpassing the state-of-the-art *** designed structures also show great potential in tackling the urban heat island effect,with modelling results suggesting a large energy saving and deployment area *** research will make significant impact on passive radiative cooling,thermal energy photonics and tackling global climate change.

关键词： radiative cooling dielectric metasurfaces machine learning thermal emitters

Ground settlement and tunnel response due to twin-curved shield tunnelling in soft ground with small clear distance

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3122-3135页

作者： Yao Hu Haoran Tang yinggang Xu Huayang Lei Peng Zeng Kai Yao Yabo Dong State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu610059China Research Center of Tunneling and Underground Engineering of Ministry of Education Beijing Jiaotong UniversityBeijing100044China College of Environment and Civil Engineering Chengdu University of TechnologyChengdu610059China School of Civil Engineering Tianjin UniversityTianjin300350China School of Qilu Transportation Shandong UniversityJinan250002China Power China Sinohydro Bureau 7 Co. Ltd.Chengdu610213China

Twin curved tunnels are often encountered in shield tunnelling,where significant complexities in densely exploited underground space are *** this study,the ground settlement and tunnel deformation due to twin-curved shield tunnelling in soft ground were investigated using numerical simulation and field *** curvature radii of twin curved tunnels and subsequent effects of tunnel construction were considered to reveal the tunnelling effect on ground surface settlement and tunnel *** results show that the settlement trough yields one offset towards inside of curved shield *** location of settlement trough and maximum settlement were affected by curvature radius but except for the shape and width of settlement *** parallel twin-curved shield tunnelling could increase the offset of existing settlement trough and maximum ***,an empirical prediction of surface settlement trough due to twin-curved shield tunnelling with same tunnel diameters in soft clay was proposed,which was applicable to curvature radius less than 800 ***,a minimum radius of 600 m of curvature tunnel was proposed in terms of allowable convergence deformation of *** result could provide guidance on safety evaluation for twin curved shield tunnelling construction.

关键词： Shield tunnelling Curvature radius Ground settlement Tunnel deformation Numerical simulation

Enhanced bifunctional oxygen electrochemical catalytic performance using La-doped CoFe_(2)O_(4)spinel supported by 3D-G for Zn-air batteries

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Journal of Energy Chemistry 2024年第7期94卷 778-788页

作者： yinggang Sun Tingwei Zhang Peng Sun Jigang Wang Wenjie Duan Yanqiong Zhuang Likai Wang Zhongfang Li School of Chemistry and Chemical Engineering Shandong University of TechnologyZibo 255049ShandongChina

The preparation of bifunctional catalysts for oxygen reduction(ORR)and oxygen evolution(OER)is crucial for Zn-air ***,we report a La doped CoFe_(2)O_(4) spinel catalyst supported on threedimensional graphene(3D-G),where La can facilitate electron transfer from Co to Fe,leading to increased electron cloud density in Fe and improved catalytic *** redshift of the G peak in the Raman spectra indicates the interaction between theπbond of 3D-G and d orbitals in La_(0.2)CoFe_(1.8)O_(4).La_(0.2)CoFe_(1.8)/3D-G exhibits superior ORR performance(E_(1/2)=0.86 V ***)and OER performance(E_(j=10)=1.55 V ***)to CoFe_(2)O_(4)/3D-G(E_(1/2)=0.831 V ***,E_(j=10)=1.603 V ***).Furthermore,it demonstrates excellent bifunctional oxygen catalytic performance while maintaining high power density and stability in liquid zinc-air batteries(ZABs)and flexible ZABs(F-ZABs).This work presents a viable strategy for utilizing rare earth element doped spinels to enhance oxygen catalyst and ZABs performance.

关键词： Zn-air batteries Electrocatalysts La_(0.2)CoFe_(1.8)/3D-G Electron pump Bifunctional oxygen catalytic performance

3D interlocked all-textile structured triboelectric pressure sensor for accurately measuring epidermal pulse waves in amphibious environments

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Nano Research 2024年第3期17卷 1923-1932页

作者： Shaobo Si Chenchen Sun Yufen Wu Jingjing Li Han Wang yinggang Lin Jin Yang Zhong Lin Wang Department of Optoelectronic Engineering Key Laboratory of Optoelectronic Technology and Systems Ministry of EducationChongqing UniversityChongqing 400044China College of Physics and Electronic Engineering Chongqing Normal UniversityChongqing 401331China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 100083China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

The performance degradation and even damage of the e-textiles caused by sweat,water,or submersion during all-weather health monitoring are the main reasons that e-textiles have not been commercialized and routinized so ***,we developed an amphibious,high-performance,air-permeable,and comfortable all-textile triboelectric sensor for continuous and precise measurement of epidermal pulse waves during full-day *** on the principle of preparing gas by acid-base neutralization reaction,a one-piece preparation process of amphibious conductive yarn(ACY)with densely porous structures is *** innovative three-dimensional(3D)interlocking fabric knitted from ACYs(0.6 mm in diameter)and polytetrafluoroethylene yarns exhibit high sensitivity(0.433 V·kPa^(-1)),wide bandwidth(up to 10 Hz),and stability(>30,000 cycles).With these benefits,98.8%agreement was achieved between wrist pulse waves acquired by the sensor and a high-precision laser ***,the polytetrafluoroethylene yarn with good compression resilience provides sufficient mechanical support for the contact separation of the ***,the unique skeletonized design of the 3D interlocking structure can effectively relieve the water pressure on the sensor surface to obtain stable and accurate pulse waves(underwater depth of 5 cm).This achievement represents an important step in improving the practicality of e-textiles and early diagnosis of cardiovascular diseases.

关键词： triboelectric pressure sensor amphibious fabric interlocking fabric pulse wave measurement one-piece preparation method

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筋的截面形状对薄壁结构振动疲劳性能的影响

航空工程进展 2017年第2期8卷 190-198页

作者：刘双燕涂玉倩苗应刚李玉龙西北工业大学航空学院西安710072

筋条的截面形状对薄壁结构的振动疲劳性能具有重要影响。对L型和T型加筋薄板进行振动试验,研究固支条件下L型筋和T型筋对薄板频率和振动疲劳寿命的影响,并从理论角度分析其原因;利用MSC有限元软件研究在正弦分布载荷下六种不同截面形状... 详细信息

筋条的截面形状对薄壁结构的振动疲劳性能具有重要影响。对L型和T型加筋薄板进行振动试验,研究固支条件下L型筋和T型筋对薄板频率和振动疲劳寿命的影响,并从理论角度分析其原因;利用MSC有限元软件研究在正弦分布载荷下六种不同截面形状(矩形、L型、T型、I型、Z型、∏型)的筋条在给定边界条件(固支、简支)下,对薄板的频率、应力和振动疲劳寿命的影响,并对加筋板的寿命进行预测。结果表明:六种加筋构型中,Z型加筋板的第一阶固有频率最大,加筋板Von Mises应力最大点出现在同样的位置;固支条件下,加筋板的破坏位置在板的左右两侧,Z型加筋板寿命最长;简支条件下,破坏位置出现在板的中央,L型加筋板的寿命最长。

关键词：薄壁加筋结构截面形状固有频率 Von Mises 振动疲劳寿命

Pressure Pulse Response of High Temperature Molten Salt Check Valve Hit by Crystal Particles

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Journal of Shanghai Jiaotong university(Science) 2024年第2期29卷 271-279页

作者：李树勋沈恒云刘斌才胡迎港马廷前 School of Petrochemical Engineering Lanzhou University of TechnologyLanzhou 730050China Machinery Industry Pump and Special Valve Engineering Research Center Lanzhou 730050China

In view of the problem that crystalline particles cause wall vibration at a low temperature,based on two-phase flow model,computational fuid dynamics is used to conduct the numerical simulation of internal flows when the valve openings are 20%,60%and 100%*** molten salt fow may be changed under strict conditions and produce forced vibration of the inner parts of molten salt particle shock valve *** two-phase flow model is used for different molten salt sizes to extract temporal pressure pulse information and conduct statistical data processing *** influence of the molten salt crystallization of molten salt particles on the fow and pressure pulse strength is *** results show that the crystallization of molten salt has a serious impact on the vibration of the valve body,especially in the throttle *** valve oscillation caused by the pressure pulsation mostly occurs from the small opening *** the opening increases,the pressure pulse threshold and its change trend decrease.

关键词： molten salt valve numerical simulation pressure pulsation two-phase flow crystal frozen blocking