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铜单晶循环变形饱和阶段疲劳裂纹萌生及表面区域内应力分布的模拟

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金属学报 2005年第1期41卷 9-14页

作者：杨继红张新平 y.w.mai 李勇沈阳师范大学物理科学与技术学院沈阳110034 Centre for Advanced Materials Technology(CAMT) School of AerospaceMechanical and Mechatronic EngineeringThe University of SydneyNSW 2006Australia 中国科学院金属研究所沈阳110016

利用扫描电镜电子通道衬度(SEM-ECC)技术观察了循环变形饱和阶段Cu单晶样品中近表面区域的位错微结构.在样品边缘一些条带状或斑点状呈黑色的位错组织区,利用离散位错动力学方法模拟了该区的位错微观结构,并计算了与此位错微结构相对应... 详细信息

利用扫描电镜电子通道衬度(SEM-ECC)技术观察了循环变形饱和阶段Cu单晶样品中近表面区域的位错微结构.在样品边缘一些条带状或斑点状呈黑色的位错组织区,利用离散位错动力学方法模拟了该区的位错微观结构,并计算了与此位错微结构相对应的内应力分布.模拟和计算结果表明,黑色区是内应力出现最大值区,即应力集中区,它与驻留滑移带(PSB)中的不均匀变形有关,是疲劳裂纹萌生最可能的位置.模拟和计算结果很好地解释了这一现象.

关键词： Cu单晶循环变形疲劳裂纹萌生离散位错动力学内应力分布

维普期刊数据库

带玻璃衬垫的硅泡沫薄膜压痕理论的近似解析与数值研究

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物理学报 2009年第F6期58卷 189-192页

作者：范天佑范蕾 y. w. mai 北京理工大学理学院北京100081 北京理工大学生命科学学院北京100081 Centre for Advanced Materials Technology University of Sydney Sydney 2006 Australia

基于弹性和多胞/泡沫固体理论,用近似解析和数值方法研究了带玻璃衬垫的硅多胞/泡沫薄膜压痕问题.研究的重点在于考察接触区的压力分布和压痕临界深度εc,并将计算得到的理论结果与实验结果进行了对比,两者基本一致.为了对这类薄膜结构... 详细信息

基于弹性和多胞/泡沫固体理论,用近似解析和数值方法研究了带玻璃衬垫的硅多胞/泡沫薄膜压痕问题.研究的重点在于考察接触区的压力分布和压痕临界深度εc,并将计算得到的理论结果与实验结果进行了对比,两者基本一致.为了对这类薄膜结构系统完整性作合理的评估,分析了多胞/泡沫材料变形和破损机理,由此提出了压痕能概念并给出了相应的解析表达式.

关键词：薄膜材料试验固体的力学性质

维普期刊数据库

Effects of the Substrate Materials on Fracture Toughn Measurement in Adhesive Joints

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Effects of the Substrate Materials on Fracture Toughn Measur...

Flexure Response of Stitched CFRP Laminates

第十三届国际复合材料会议

作者： C.yan Q.yuan L.ye y.w.mai J.Sun Centre of Advanced Materials Technology (CAMT Department of Mechanical and Mechatronic Engineering J07 The University of Sydney NSW 2006 Australia Centre of Advanced Materials Technology (CAMT Department of Mechanical and Mechatronic Engineering J07 The University of Sydney NSW 2006 Australia Centre of Advanced Materials Technology (CAMT Department of Mechanical and Mechatronic Engineering J07 The University of Sydney NSW 2006 Australia Centre of Advanced Materials Technology (CAMT Department of Mechanical and Mechatronic Engineering J07 The University of Sydney NSW 2006 Australia School of Materials Science and Engineering Xian Jiaotong University Xian Shanxi 710049 P.R. China

＜正＞The evaluation of failure of adhesive joints is of great importance in the use of bonding for structural application. A detailed testing procedure for adhesive joints with metal substrate has also been standardised in ASTM standard （D 3433-93） to measure the strain energy release rate （G）. More recently, the effect of substrate material on mode-Ⅰadhesive fracture energy has been investigated by Bell and Kinloch [1]. Their results indicated that high fracture energy was associated with the substrate material with a higher stiffness even though

关键词： adhesive joint fracture toughness composite material

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Flexure Response of Stitched CFRP Laminates

第十三届国际复合材料会议

作者： H.P.Zhao RobertK.y.Li Z.P.Duan J.KKim y.w.mai LNM Institute of Mechanics Chinese Academy of Sciences 100080 Beijing People’s Republic of China Department of Applied Physics and Materials Science City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong China Department of Applied Physics and Materials Science City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong China LNM Institute of Mechanics Chinese Academy of Sciences 100080 Beijing People’s Republic of China Department of Mechanical Engineering Hong Kong University of Science and technology Clear Water Bay Kowloon Hong Kong China Department of Manufacturing Engineering and Engineering Management City University of Hong Kong Tat Chee Avenue Kowloon Hong Kong China

＜正＞The flexure response of stitched CFRP composites under static and impact loading was investigated in this paper. CFRP composites laminates were lay up with 24 plies of prepreg, and were stitched with Kevlar29 yarns using three different stitching patterns （see Fig.1）. Other than the three different stitching patterns, two different stitching densities were also employed. The end-notch flexure （ENF） sample geometry was used. Typical loading-displacement curves obtained from the measurements were shown in Fig. 2.

关键词： flexural response stitching CFRP failure processes SEM

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金属多胞材料反平面应变裂纹的稳态扩展

金属多胞材料反平面应变裂纹的稳态扩展

Repeatability,interocular correlation and agreement of optic nerve head vessel density in healthy eyes:a sweptsource optical coherence tomographic angiography study

2002年中国材料研讨会

作者：郭瑞平刘官厅范天佑 y.w.mai 北京理工大学北京理工大学北京理工大学悉尼大学

本文应用奇异摄动法研究了DF模型下金属多胞材料Ⅲ型裂纹的稳态扩展,并根据裂纹尖端附近的塑性变形与弹性变形必须相平衡的观点给出了裂尖附近的最低阶渐近解。

关键词：金属多胞材料裂纹稳态扩展反平面应变 DF模型奇异摄动法

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International Journal of Ophthalmology(English edition) 2024年第5期17卷 896-903页

作者： Dan-Qi Fang Da-wei yang Xiao-Ting mai Carol y Cheung Hao-yu Chen Joint Shantou International Eye Center Shantou University&the Chinese University of Hong KongShantou 515041Guangdong ProvinceChina Department of Ophthalmology and Visual Sciences Chinese University of Hong KongHong Kong 999077China

AIM:To assess the repeatability,interocular correlation,and agreement of quantitative swept-source optical coherence tomography angiography(OCTA)optic nerve head(ONH)parameters in healthy ***:Thir ty-three healthy subjects were *** ONH of both eyes were imaged four times by a swept-source-OCTA using a 3 mm×3 mm scanning *** of the radial peripapillary capillary were analyzed by a customized Matlab program,and the vessel density,fractal dimension,and vessel diameter index were *** repeatability of the four scans was determined by the intraclass correlation coefficient(ICC).The most well-centered optic disc from the four repeated scans was then selected for the interocular correlation and agreement analysis using the Pearson correlation coefficient,ICC and Bland-Altman ***:All swept-source-OCTA ONH parameters exhibited certain repeatability,with ICC>0.760 and coefficient of variation(CoV)≤7.301%.The obvious interocular correlation was observed for papillary vessel density(ICC=0.857),vessel diameter index(ICC=0.857)and fractal dimension(ICC=0.906),while circumpapillary vessel density exhibited moderate interocular correlation(ICC=0.687).Bland-Altman plots revealed an agreement range of-5.26%to 6.21%for circumpapillary vessel ***:OCTA ONH parameters demonstrate good repeatability in healthy *** interocular correlations of papillary vessel density,fractal dimension and vessel diameter index are high,but the correlation for circumpapillary vessel density is moderate.

关键词： interocular correlation repeatability optic nerve head optical coherence tomography angiography vessel density

Dual-Porosity Apparent Permeability Models of Unconventional Gas Migration Based on Biot’s Porous Media

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Acta Mechanica Solida Sinica 2024年第3期37卷 406-415页

作者： Bin Gu Hongyuan Liu yiuwing mai Bing wang School of Manufacturing Science and Engineering Key Laboratory of Testing for Manufacturing ProcessMinistry of EducationSouthwest University of Science and TechnologyMianyang621010China School of Aerospace Mechanical and Mechatronic EngineeringThe University of SydneySydneyNSW2006Australia Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongChina

Stress-dependent permeability models are developed for the organic pores and inorganic cleats/fractures in unconventional gas reservoirs,which are modeled as Biot’s porous media of *** considering multiple flow mechanisms such as dynamic effects of gas flow and surface diffusion,apparent permeability models are obtained to investigate the characteristics of unconventional gas *** to the gas transfer in single-porosity reservoirs,the gas migration ability of cleats in dual-porosity stratums rarely changes while that of organic pores is greatly improved because cleats sustain major geomechanical shrinkage deformation when the pore pressure ***,the mass flux of reservoirs is dominated by the mass flux of cleats,which has a lower peak value,but a much longer production term than those in single-porosity reservoirs due to the interaction between organic pores and *** analysis is conducted to identify key factors significantly impacting mass flux in unconventional *** for the mass flux variation are also explored in terms of gas migration ability and pore pressure distribution.

关键词： Unconventional gas migration Apparent permeability Dual-porosity Stress dependence Multiple flow mechanisms

Integrated strategies on cobalt phosphides-based electrocatalysts for efficient hydrogen evolution reaction

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Tungsten 2024年第3期6卷 488-503页

作者： Thanh Dam mai Ha Huu Do Faculty of Mechanical Engineering and Technology Ho Chi Minh City University of Industry and Trade VKTech Research Center NTT Hi-Tech Institute Nguyen Tat Thanh University

The development of cost-effective and durable hydrogen evolution reaction(HER) electrocatalysts plays a vital role in dealing with the issues related to carbon dioxide *** phosphide-based nanomaterials are evaluated as promising advocates for HER due to high catalytic activities,good stability,and rich *** review commences with an exploration of the synthetic pathways of CoP,including solid-phase,solution-phase along with electrochemical ***,the mechanism of hydrogen formation is expressed thoroughly,after which various integrated strategies of morphology engineering with doping,assisted highly conductive materials,and construction of heterostructure were introduced for ***,burdensome tasks and possible guidance for the advancement of CoP-based nanomaterials were discussed for hydrogen production.

关键词： Cobalt phosphides Nanomaterials Electrocatalysts Hydrogen evolution reaction

Dynamic COVID Zero Strategy triggered a significant increase of chlorine-based disinfectant

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Frontiers of Environmental Science & Engineering 2024年第8期18卷 73-80页

作者： Xuhao wang mai Su Chunyan wang yi Liu School of Environment Tsinghua UniversityBeijing 100084China

Chlorine-based disinfectants(CBDs)have been widely used to prevent and control the spread of the COVID-19,which may lead to the formation of carcinogenic *** China,strict disinfection strategies by local governments/communities or volunteering by residents have been implemented to meet the Dynamic COVID Zero(DCZ)***,the amount of CBDs used has not been *** author proposed an urban-scale disinfectant consumption estimation(ALICE)model to quantify weekly CBD *** results show that the CBD consumption for the urban region of Beijing during the DCZ strategy was 3704.0 t(0.43 kg/(cap-yr)),equivalent to a monthly increase of 15 g/cap(70.5%)in CBD consumption compared with that in *** to the scenario analysis,a stricter strategy with a shorter response time toward new cases will decrease the total CBD consumption by 1.2% compared with the baseline estimation.A more precise prevention strategy with a smaller delineation of risk area and a less stringent strategy with a longer response time will lower the total CBD consumption by 0.42% and 0.35%,***,the more precise prevention strategy will reduce CBD consumption of close off and lockdown area(COLD area)by 16.9%,and the stricter strategy will reduce this consumption by 37.7%.This study highlights the impact of pandemic prevention and control strategies on chlorine-based disinfectant consumption and some implications for future environmental pollution and risk assessments.

关键词： COVID-19 Dynamic COVID Zero Strategy Disinfectants consumption Bottom-up approach Scenario analysis