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Fatigue Crack Initiation Potential from Defects in terms of Local Stress Analysis

Chinese Journal of Mechanical Engineering 2014年第3期27卷 496-503页

作者： zhu mingliang XUAN Fuzhen Key Laboratory of Pressure Systems and Safety Ministry of Education East China University of Science and Technology School of Mechanical and Power Engineering East China University of Science and Technology

The competition of surface and subsurface crack initiation induced failure is critical to understand very high cycle fatigue（VHCF） behavior, which necessitates the elucidation of the underlying mechanisms for the transition of crack initiation from surface to interior defects. Crack initiation potential in materials containing defects is investigated numerically by focusing on defect types, size, shape, location, and residual stress influences. Results show that the crack initiation potency is higher in case of serious property mismatching between matrix and defects, and higher strength materials are more sensitive to soft inclusions（elastic modulus lower than the matrix）. The stress localization around inclusions are correlated to interior crack initiation mechanisms in the VHCF regime such as inclusion-matrix debonding at soft inclusions and inclusion-cracking for hard inclusions（elastic modulus higher than the matrix）. It is easier to emanate cracks from the subsurface pores with the depth 0.7 times as large as their diameter. There exists an inclusion size independent region for crack incubation, outside which crack initiation will transfer from the subsurface soft inclusion to the interior larger one. As for elliptical inclusions, reducing the short-axis length can decrease the crack nucleation potential and promote the interior crack formation, whereas the long-axis length controls the site of peak stress concentration. The compressive residual stress at surface is helpful to shift crack initiation from surface to interior inclusions. Some relaxation of residual stress can not change the inherent crack initiation from interior inclusions in the VHCF regime. The work reveals the crack initiation potential and the transition among various defects under the influences of both intrinsic and extrinsic factors in the VHCF regime, and is helpful to understand the failure mechanism of materials containing defects under long-term cyclic loadings.

关键词： very high cycle fatigue crack initiation inclusion pore local stress

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A thriving decade: rational design, green synthesis, and cutting-edge applications of isoindigo-based conjugated polymers in organic field-effect transistors

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Science China Chemistry 2022年第7期65卷 1225-1264页

作者： mingliang zhu Yunlong Guo Yunqi Liu Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China

Recent advances in organic electronics of novel materials and optoelectronic devices spark great interest in the design and synthesis of high-performance polymer semiconductors. During the last decade, isoindigo(ⅡD) and its derivatives have sprung up as common electron-deficient building blocks and obtained extensive applications in organic field-effect transistors(OFETs).In this review, we first present the current status, basic principles, and general material design strategies for OFETs. Then,multiple ⅡD-type acceptors, mature synthetic routes to monomers, and typical ⅡDs-based conjugated polymers are *** also introduce side-chain engineering and cutting-edge applications, like stretchable transistors, sensing, active-matrix driving, etc., of the classic copolymer poly(isoindigo-co-bithiophene). Green polymerization approaches towards conjugated polymers incorporating ⅡDs are subsequently discussed for efficient polymerization. Finally, we conclude this review and propose in-depth prospects with respect to material synthesis and device applications. Undoubtedly, ⅡDs-based conjugated polymers would occupy a significant position in the future of organic electronics, due to diverse building blocks, mature synthetic pathways, tunable side chains, and unique optoelectronic properties.

关键词： isoindigos green synthesis cutting-edge applications polymer field-effect transistors

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Digital Twin for Integration of Design-Manufacturing-Maintenance:An Overview

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Chinese Journal of Mechanical Engineering 2022年第4期35卷 1-20页

作者： Yang Fu Gang zhu mingliang zhu Fuzhen Xuan Key Laboratory of Pressure Systems and Safety Ministry of EducationSchool of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China

Traditional design,manufacturing and maintenance are run and managed independently under their own rules and regulations in an increasingly time-and-cost inefective manner.A unifed platform for efcient and intelligent designmanufacturing-maintenance of mechanical equipment and systems is highly needed in this rapidly digitized *** this work,the defnition of digital twin and its research progress and associated challenges in the design,manufacturing and maintenance of engineering components and equipment were thoroughly *** is indicated that digital twin concept and associated technology provide a feasible solution for the integration of design-manufacturingmaintenance as it has behaved in the entire lifecycle of *** this aim,a framework for information-physical combination,in which a more accurate design,a defect-free manufacturing,a more intelligent maintenance,and a more advanced sensing technology,is prospected.

关键词： Digital twin Design-manufacturing-maintenance integration Artifcial intelligence Deep learning Information fusion Cyber-physical systems

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Multifunction-oriented high-mobility polymer semiconductors

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National Science Review 2024年第3期11卷 16-19页

作者： mingliang zhu Yunlong Guo Yunqi Liu Beijing National Laboratory for Molecular Sciences Organic Solids Laboratory Institute of Chemistry Chinese Academy of Sciences School of Chemical Sciences University of Chinese Academy of Sciences

The discovery of conductive polyacetylene has initiated interdisciplinary research into condensed matter physics and synthetic chemistry in organic electronics. Unlike their inorganic and small-molecule counterparts, polymer semiconductors possess the inherent advantages of facile solution processing,large-area manufacturing, excellent mechanical strength and intrinsic flexibility.

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Spatial patterns of zooplankton abundance,biovolume,and size structure in response to environmental variables:a case study in the Yellow Sea and East China Sea

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Journal of Oceanology and Limnology 2024年第1期42卷 113-127页

作者： Song SUN Haochen XIAN Xiaoxia SUN mingliang zhu Mengtan LIU Key Laboratory of Marine Ecology and Environmental Sciences Institute of OceanologyChinese Academy of SciencesQingdao 266071China Jiaozhou Bay National Marine Ecosystem Research Station Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China Laboratory for Marine Ecology and Environmental Science Laoshan LaboratoryQingdao 266237China

The Yellow Sea(YS)and East China Sea(ECS)are highly dynamic marginal seas of the northwestern Pacific *** gain an in-depth understanding of zooplankton community structure,zooplankton abundance,biovolume,and size structure in summer 2017 in the YS and ECS were assessed using ZooScan imaging *** abundance and biovolume ranged 2.94–1187.14 inds./m^(3)and 3.13–3438.51 mm^(3)/m^(3),*** on the biovolume data of the categorized size classes of 26 identified taxonomic groups,the zooplankton community was classified into five groups,and each group was coupled with distinctive oceanographic *** the influence of the Yellow Sea Cold Water Mass,the Yellow Sea offshore group featured the lowest bottom temperature(10.84±3.42℃)and the most abundant Calanoids(mainly in the 2–3 mm size class).In the Yellow Sea inshore group,Hydrozoans showed the largest biovolume and dominated in the 3–4-mm and>5-mm size *** East China Sea offshore group,which was affected by the Kuroshio Branch Current,featured high temperature and salinity,and the lowest bottom dissolved oxygen(2.58±0.5 mg/L).The lowest values of zooplankton abundance and biovolume in the East China Sea offshore group might be attributed to the bottom dissolved oxygen *** East China Sea inshore group,which was mainly influenced by the Zhejiang-Fujian Coastal Current and Changjiang Diluted Water,was characterized by high chlorophyll a and the largest biovolume of carnivorous Siphonophores(280.82±303.37 mm^(3)/m^(3)).The Changjiang River estuary offshore group showed the most abundant Cyclopoids,which might be associated with the less turbid water mass in this *** temperature was considered the most important factor in shaping the size compositions of Calanoids in different groups.

关键词： zooplankton size structure ZooScan Yellow Sea East China Sea

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Synergistic effect of diethylene triamine penta(methylene phosphonic acid) and graphene oxide barrier on anti-scaling and anti-corrosion performance of superhydrophobic coatings

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Frontiers of Materials Science 2023年第3期17卷 131-144页

作者： mingliang zhu Hongwei Li Ruixia Yuan Huijuan Qian Huaiyuan Wang College of Chemistry and Chemical Engineering Northeast Petroleum UniversityDaqing 163318China College of Chemical Engineering Daqing Normal UniversityDaqing 163712China

In this study,a novel diethylene triamine penta(methylene phosphonic acid)(DTPMPA)-and graphene oxide(GO)-modified superhydrophobic anodized aluminum(DGSAA)coating was *** obtained coatings were characterized by scan electron microscopy,X-ray diffraction,Fourier transform infrared spectroscopy,and Raman *** immersion in the supersaturated CaCO_(3) solution for 240 h,the scaling mass of the DGSAA coating is only 50%of that of the SAA *** excellent anti-scaling performance of the DGSAA coating comes from three barriers of the air layer,the DTPMPA:Ca^(2+)chelate,and the lamellar GO,as well as the further active anti-scaling of DTPMPA:Ca^(2+)at the coating–solution *** and GO at the surface of the DGSAA coating exhibit an insertion *** the electrochemical impedance spectroscopy measurement,the impedance modulus of the DGSAA coating is three orders-of-magnitude higher than that of the anodized *** synergistic effect of DTPMPA stored in the porous structure of anodized aluminum and the barrier protection of superhydrophobicity and GO contributes to the excellent comprehensive performance of the DGSAA *** research provides a new perspective for designing anti-scaling and anti-corrosion superhydrophobic bi-functional coatings.

关键词： anti-scaling anti-corrosion DTPMPA graphene oxide synergistic effect barrier

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Strain transfer behavior and crystallographic mechanism of crack initiation during cyclic deformation in zirconium

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Journal of Materials Science & Technology 2023年第31期162卷 234-246页

作者： Xiangkang Zeng Conghui Zhang Wenguang zhu mingliang zhu Tongguang Zhai Chi Ma Tingchuang Shu KangKai Song School of Metallurgical Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Key Laboratory of Pressure Systems and Safety Ministry of EducationSchool of Mechanical and Power EngineeringEast China University of Science and TechnologyShanghai 200237China School of Materials Science and Engineering Shandong Jianzhu UniversityJinan 250101China

Fully-reversed cyclic deformation of a pure Zr(a thickness of 17 mm)was conducted at two different strain amplitudes(0.4%and 0.8%)to investigate the deformation and crack initiation behaviors based on slip trace *** was found that prismaticaslip with a higher Schmid Factor(m>0.4)was the dominant deformation *** grains containing persistent slip bands(PSBs)tended to go towards[1210]pole and the Schmid Factor had a critical value of 0.4 above which prismatic and pyramidal slip were *** cracks were mainly initiated at PSBs and grain boundaries(GBs).It showed that 61.1%of the cracks were PSB cracks under a strain amplitude of 0.4%,while it decreased to 53.5%at a strain amplitude of 0.8%.PSB cracks were mainly parallel to prismaticaslip with higher Schmid Factor while some cracks tended to be initiated at GBs with higher misorientation *** interaction of PSBs with GBs would result in strain transferring to the neighboring *** transfer was more likely to occur at the condition of the higher geometrical compatibility factor m,and lower residual Burgers vectorb,which could reduce strain localization.

关键词： Fatigue crack initiation Crystallographic orientation PSBs GBs Strain transfer

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Relationship Between Zooplankton Community Characteristics and Environmental Conditions in the Surface Waters of the Western Pacific Ocean During the Winter of 2014

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Journal of Ocean University of China 2021年第3期20卷 706-720页

作者： TIAN Ziyang ZHENG Shan GUO Shujin zhu mingliang LIANG Junhua DU Juan SUN Xiaoxia Jiaozhou Bay National Marine Ecosystem Research Station Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Qingdao National Laboratory for Marine Science and TechnologyQingdao 266237China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Institute of OceanologyChinese Academy of SciencesQingdao 266071China

Understanding the effects of environmental heterogeneity on zooplankton communities has been a hot topic for several ***,relatively little is known about the responses of zooplankton communities to environmental conditions at large scales from inshore waters to the open ***,we used the abundance,biovolume,taxa and size spectra of zooplankton col-lected from the surface waters of the western Pacific Ocean during the winter of 2014 to study the relationship between zooplankton community characteristics and environmental conditions using multiple linear regression(MLR)analysis and redundancy analysis(RDA).According to a hierarchical cluster analysis based on hydrographic conditions,the study area was classified into five water *** correlations were identified between the limited nutrients and the zooplankton abundance and biovolume from inshore waters to the open ***-metric multidimensional scaling(NMDS)revealed two distinct zooplankton *** the northern inshore,Copepoda and Euphausiacea were the dominant zooplankton taxa and in other water masses,Chaetognatha and gelatinous zooplankton were the dominant zooplankton taxa in addition to *** results suggested that,on a large scale from inshore waters to the open ocean in the western Pacific Ocean,the spatial distribution of zooplankton taxa was mainly influ-enced by environmental conditions,while in the inshore waters,it was due to the top-down effect of the dominant zooplankton ***,the slope of the normalized biovolume size spectra(NBSS)was negatively correlated with chlorophyll-a(Chl-a)concentra-tion and PO_(4)^(3−)-P concentration in the inshore waters,which indicated that the higher the trophic level the dominant zooplankton taxa were,the steeper the NBSS slope was.

关键词： zooplankton western Pacific Ocean spatial variation normalized biovolume spectra

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Abundance and characteristics of microplastics in shellfi sh from Jiaozhou Bay,China

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Journal of Oceanology and Limnology 2022年第1期40卷 163-172页

作者： Kangning ZHANG Junhua LIANG Tao LIU Qingjie LI mingliang zhu Shan ZHENG Xiaoxia SUN Jiaozhou Bay National Marine Ecosystem Research Station Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Center for Ocean Mega-Science Institute of OceanologyChinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China

As an emerging pollutant,the presence of microplastics in marine organisms has been concerned *** sh,which are both economically and ecologically important,are of particular *** this study,we investigated the microplastic pollution in wild and farmed oysters(Crassostrea gigas)and clams(Ruditapes philippinarum)in the Jiaozhou Bay,China,for the fi rst *** found the microplastic pollution in shellfi sh in Jiaozhou Bay was at a moderate *** abundance of microplastics in shellfi sh ranged from 0.16 to 12.09 items/g(wet weight,ww)or 1 to 9 items/*** average abundance of the ingested microplastics was 1.21 items/g(or 2.17 items/ind.)in all shellfi sh,1.51 items/g(or 2.00 items/ind.)in clams and 0.92 items/g(or 2.34 items/ind.)in *** abundance of microplastics in clams was signifi cantly higher than that in *** microplastics(92.97%)were fi bers,followed by *** predominant color of the microplastics was black(42.97%),followed by blue,transparent,and *** and polyethylene terephthalate(PET)dominated the microplastic *** to shellfi sh consumption,it can be inferred that the average microplastic consumption through Chinese diet is 1.27×10^(3)items per capita per year.

关键词： microplastics bivalves Jiaozhou Bay risk assessment

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Spatial-temporal variation of phytoplankton community structure in Jiaozhou Bay, China

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Journal of Oceanology and Limnology 2019年第5期37卷 1611-1624页

作者： GUO Shujin zhu mingliang ZHAO Zengxia LIANG Junhua ZHAO Yongfang DU Juan SUN Xiaoxia Jiaozhou Bay National Marine Ecosystem Research Station Chinese Academy of SciencesQingdao 266071China Laboratory for Marine Ecology and Environmental Science Pilot National Laboratory for Marine Science and Technology (Qingdao)Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China University of Chinese Academy of Sciences Beijing 100049China

To better understand the spatial-temporal variation in phytoplankton community structure and its controlling factors in Jiaozhou Bay, Qingdao, North China, four seasonal sampling were carried out in 2017. The phytoplankton community structure and various environmental parameters were examined. The phytoplankton community in the bay was composed of mainly diatoms and dinofl agellates, and several other species of Chrysophyta were also observed. Diatoms were the most dominant phytoplankton group throughout the year, except in spring and winter, when Noctiluca scintillans was co-dominant. High Si/N ratios in summer and fall refl ect the high dominance of diatoms in the two seasons. Temporally, the phytoplankton cell abundance peaked in summer, due mainly to the high temperatures and nutrient concentrations in summer. Spatially, the phytoplankton cell abundance was higher in the northern part of the bay than in the other parts of the bay in four seasons. The diatom cell abundances show signifi cant positive correlations with the nutrient concentrations, while the dinofl agellate cell abundances show no correlation or a negative correlation with the nutrient concentrations but a signifi cant positive correlation with the stratifi cation index. This discrepancy was mainly due to the diff erent survival strategies between diatoms and dinofl agellates. The Shannon-Wiener diversity index ( H′) values in the bay ranged from 0.08 to 4.18, which fell in the range reported in historical studies. The distribution pattern of H′ values was quite diff erent from that of chlorophyll a , indicating that the phytoplankton community structure might have high biomass with a low diversity index. Compared with historical studies, we believe that the dominant phytoplankton species have been changed in recent years due mainly to the changing environment in the Jiaozhou Bay in recent 30 years.

关键词： phytoplankton community structure environmental parameter seasonal variation cell abundance Jiaozhou Bay

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