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Preface:Simulation of Fluid-Structure Interaction Problems

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Computer Modeling in Engineering & Sciences 2019年第4期119卷 1-3页

作者： Zhilin Li X.Sheldon Wang Lucy t.zhang Department of Mathematics 2108 SAS HallNC StateRaleighNC 27695USA McCoy School of Engineering Midwestern State University3410 Taft BoulevardWichita FallsTX 76308USA Department of Mechanical Aerospace&Nuclear EngineeringRensselaer Polytechnic Institute1108th St.TroyNY 12180USA

In recent years,there has been a major surge of interest in the development of simulation techniques and strategies for fluid-structure interaction(FSI)problems,mainly driven by a large spectrum of applications in phy... 详细信息

关键词： Structure Preface strategies

A novel package system based on an EBV replicon vector for producing high titer recombinant adeno-associated virus vector

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Chinese Science Bulletin 1997年第20期42卷 1741-1744页

作者： Yan, ZY Yao, EM zhang, t Shu, YL Hou, YD Chinese Acad Prevent Med Inst Virol State Key Lab Mol Virol & Genet Engn Beijing 100052 Peoples R China

ADENO-ASSOCIAtED virus (AAV) was a human parvovirus considered as a gene delivery vehiclefor human gene therapy. Recombinant AAV vector (rAAV) could mediate the foreign DNAintegration into chromosome and establish a stable expression in the infected cells. As a viraltransduction vector, rAAV was superior to the traditional retrovirus vector for its high *** pathogenicity, and capacity of infecting postmitosis cells. the current strategy for produc-

关键词： recombinant AAV vector EBV replicon vector package cell line.

A prediction of in vivo mechanical stresses in blood vessels using thermal expansion method and its application to hypertension and vascular stenosis

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Acta Mechanica Sinica 2018年第6期34卷 1156-1166页

作者： Shaoxiong Yang Lucy t.zhang Cheng Hua Yunqiao Liu Jingdong tang Xiaobo Gong Zonglai Jiang Shaoxiong Yan91·Lucy t.Zhan92 3·Cheng Hua4·Yunqiao Liul·Jingdong Tan95·Xiaobo Gon916.Zonglai Jian971Key Laboratory of Hydrodynamics(Ministry of Education)Department of Engineering MechanicsSchool of NavalArchitectureOcean and Civil EngineeringShanghai JiaoTong UniversityShanghai200240China Department of Mechanical Aerospace and NuclearEngineeringRensselaer Polytechnic InstituteTroyNY12180.USA School of Mechanical Engineering Tianjin University ofScience and TechnologyTianjin300222China Department of Aeronautics and Astronautics FudanUniversityShanghai200433China Vascular Surgery Department Shanghai Pudong HospitalFudan Affiliated Pudong Medical CenterShanghai200120China Collaborative Innovation Center for Advanced Ship and DeepSea Exploration School of Naval ArchitectureOcean andCivil EngineeringShanghai Jiao Tong UniversityShanghai200240China Institute of Mechanobiology and Biomedical Engineering School of Life Sciences and BiotechnologyShanghai Jiao Tong UniversityShanghai 200240China

Mechanical stimuli play critical roles in cardiovascular diseases,in which in vivo stresses in blood vessels present a great challenge to *** on the structural-thermal coupled finite element method,we propose a thermal expansion method to estimate stresses in multi-layer blood vessels under healthy and pathological *** proposed method provides a relatively simple and convenient means to predict reliable in vivo mechanical stresses with accurate residual *** method is first verified with the opening-up process and the pressure-radius responses for single and multi-layer vessel *** is then applied to study the stress variation in a human carotid artery at different hypertension stages and in a plaque of vascular *** results show that specific or optimal residual stresses exist for different blood pressures,which helps form a homogeneous stress distribution across vessel *** elastic shear stress is identified on the shoulder of the plaque,which contributes to the tearing effect in plaque *** present study indicates that the proposed numerical method is a capable and efficient in vivo stress evaluation of patient-specific blood vessels for clinical purposes.

关键词： Cardiovascular disease In vivo stress Multi-layer vessel structure Hypertension Stenosed vessel

StUDY OF PREPARAtION PROCESS OF tUNGStEN POWDER BY SHS WItH A MAGNESIUM tHERMIt StAGE

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Acta Metallurgica Sinica(English Letters) 2004年第5期17卷 719-724页

作者： t.A.zhang Y.L.Wang Z.H.Dou H.Yang SchoolofMetallurgy＆Materials NortheasternUniversityShenyang110004China InstituteofMetalResearch TheChineseAcademyofSciencesShenyang110016Ghina

tungsten powder was fabricated from the system CaWO4-Mg by self-propagating high-temperature synthesis (SHS) with a magnesium thermit stage. the physic-chemical change during heating and the effects of pressure of sample and diluents (W powder) on product have been studied. the experimental results show that the porosity of combustion product and the particle size of final tungsten powder decrease with increasing pressure of sample. Addition of diluents could increase the particle size of final tungsten powder. the purity of tungsten is improved by leaching in NaOH solution. the results of spectral analysis and particle size distribution of final tungsten powder show that the final tungsten powder has a median diameter of 0.87μm,specific surface area of 1.09m2/g and purity of above 99.0%.

关键词： self-propagating high-temperature synthesis (SHS) magnesium thermit,tungsten Powder

MICROStRUCtURE OF BINARY Mg-Al EUtECtIC ALLOY WIRES PRODUCED BY tHE OHNO CONtINUOUS CAStING PROCESS

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Acta Metallurgica Sinica(English Letters) 2008年第4期21卷 275-281页

作者： Z.M. zhang t. Lü C.J. Xu X.F. Guo School of Materials Science ＆ Engineering Xi＇an University of Technology Xi＇an 710048 China

Directionally solidified binary Mg-Al eutectic alloy wires of approximately 5 mm in diameter were produced by the Ohno continuous casting （OCC） process and the microstructure was examined. It was found that the wires possess obvious unidirectional growth characteristic along its axial direction. the microstructure consists of parallel columnar grains that resulted from the competitive growth of equiaxed grains solidified on the head of dummy bar. Each columnar grain comprises regular eutectic a-Mg and β-Mg17 Al12 phases, which grew along the axial direction of the wires. the morphology of the eutectic is mainly lamellar, meanwhile rod eutectic exists. the formation of rod eutectic was attributed to the ＂bridging effect＂ caused by incidental elements in the alloy.

关键词： Mg-Al alloy Eutectic structure Directional solidification OCC process

HREM StUDY OF tHE AUStENItE/MARtENSItE INtERFACES IN AN Fe-9Ni ALLOY

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Acta Metallurgica Sinica(English Letters) 1997年第5期10卷 386-391页

作者： Li, G.L. Meng, X.M. zhang, F.t. Wu, Y.K. Inst of Metal Research Chinese Acad of Sciences Shenyang China

the atomic level structures of fcc/bcc interfaces in an Fe-9Ni alloy have been examined by means of HREM. It has been found that the orientation of γ prime /α interface had great effects on its atomic structure. these interfaces with different orientations may be composed of only structural ledges, structural ledges with misfit dislocations, superledges with misfit dislocations or only misfit dislocations. A structural model of growth ledge was suggested. the terrace of growth ledge was composed of structural ledges or misfit dislocations. the atomic structure of the riser of growth ledge was the same as that of the side facet of γ prime lath, which is composed of superledges with misfit dislocations.

关键词： Austenite Electron microscopy Interfaces (materials) Martensite Nickel alloys

PREDICtION OF CARBON CONCENtRAtION AND FERRItE VOLUME FRACtION OF HOt-ROLLED StEEL StRIP DURING LAMINAR COOLING

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Acta Metallurgica Sinica(English Letters) 2007年第4期20卷 251-257页

作者： Y.t. zhang C.Z. Wang D.Z. Li Y.Y. Li School of Material Science and Engineering Shenyang Ligong University Shenyang 110168 China Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

A phase transformation model was presented for predicting the phase fraction transformed and the carbon concentration in austenite for austenite to ferrite transformation during laminar cooling on run-out table in hot rolling strip mill. In this model, the parameter k in Avrami equation was developed for carbon steels. the wide range of chemical composition, the primary austenite grain size, and the retained strain were taken into account. It can be used to predict the ferrite volume fraction and the carbon concentration in austenite of hot-rolled steel strip during laminar cooling on run-out table. the coiling temperature controlling model was also presented to calculate the temperature of steel strip. the transformation kinetics of austenite to ferrite and the evolution of carbon concentration in austenite at different temperatures during cooling were investigated in the hot rolled Q235B strip for thickness of 9.35, 6.4, and 3.2mm. the ferrite volume fraction along the length of the strip was also calculated. the calculated ferrite volume fraction was compared with the log data from hot strip mill and the calculated results were in agreement with the experimental ones. the present study is a part of the prediction of the mechanical properties of hot-rolled steel strip, and it has already been used on-line and off-line in the hot strip mill.

关键词： carbon concentration ferrite volume fraction laminar cooling hot rolling

Dynamic mechanical relaxation behavior of Zr_(35)Hf_(17.5)ti_(5.5)Al_(12.5)Co_(7.5)Ni_(12)Cu_(10)high entropy bulk metallic glass

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Journal of Materials Science & technology 2021年第24期83卷 248-255页

作者： L.t.zhang Y.J.Duan t.Wada H.Kato J.M.Pelletier D.Crespo E.Pineda J.C.Qiao School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an710072China Institute for Materials Research Tohoku UniversitySendai980-8577Japan Universitéde Lyon MATEISUMR CNRS5510Bat.B.PascalINSA-LyonF-69621Villeurbanne CedexFrance Department of Physics Barcelona Research Center in Multiscale Science and TechnologyInstitute of Energy TechnologiesUniversitat Politècnica de Catalunya08019BarcelonaSpain

Non-equiatomic high entropy bulk metallic glasses were reported recently and show unique mechanical and physical *** mechanical relaxation behavior of Zr_(35)Hf_(17.5)ti_(5.5)Al_(12.5)Co_(7.5)Ni_(12)Cu_(10)high entropy bulk metallic glass was investigated by dynamic mechanical analysis(DMA)and the mechanical spectra could be well described by the quasi-point defects(QPD)*** to typical metallic glasses,the intensity of theβrelaxation of Zr_(35)Hf_(17.5)ti_(5.5)Al_(12.5)Co_(7.5)Ni_(12)Cu_(10)high entropy bulk metallic glass is lower due to the sluggish *** the same time,the correlation factor is higher than that of conventional metallic glasses and this is ascribed to the high configuration *** parallel,physical aging below the glass transition temperature leads to a decrease of atomic mobility,caused by a decrease of the concentration of defects.

关键词： High entropy bulk metallic glass Mechanical relaxation Quasi-point defects Physical aging

Analysis of the anelastic deformation of high-entropy Pd_(20)Pt_(20)Cu_(20)Ni_(20)P_(20) metallic glass under stress relaxation and recovery

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Journal of Materials Science & technology 2022年第12期107卷 82-91页

作者： Y.J.Duan L.t.zhang t.Wada H.Kato E.Pineda D.Crespo J.M.Pelletier J.C.Qiao School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an 710072China Department of Physics Institute of Energy TechnologiesUniversitat Politècnica de CatalunyaBarcelona 08019Spain Institute for Materials Research Tohoku UniversitySendai 980-8577Japan Universitéde Lyon MATEISUMR CNRS5510Bat.B.PascalINSA-LyonF-69621 Villeurbanne CedexFrance

the anelastic deformation behavior of Pd_(20)Pt_(20)Cu_(20)Ni_(20)P_(20) high-entropy metallic glass was probed by monitoring the stress relaxation and recovery processes. the stress relaxation under consecutive strain steps can be described by the Kohlrausch-Williams-Watts(KWW) function. In addition, considering a hierarchy of relaxation processes related to the structural heterogeneity, a constitutive model is proposed in order to describe the whole process of stress relaxation and determine the contribution of different time scales. Moreover, a crossover from stochastic activation to percolation of flow defects with the ultimate strain can be observed during stress relaxation process. the anelastic recovery process after a strain step is studied as a function of the initial strain level and characterized by means of a direct spectrum analysis. the peaks in the recovery time-spectra revealed the evolution of flow defects in Pd_(20)Pt_(20)Cu_(20)Ni_(20)P_(20) high-entropy metallic glass. the understanding of the atomic free-volume zones effect and the anelastic deformation provides important insight into how atomic structural features affect the deformation behavior of high-entropy metallic glasses, and may provide a new avenue into the improvement of their mechanical properties.

关键词： High-entropy metallic glass Stress relaxation Anelastic deformation Flow defects Free-volume zones