■工学部_研究紹介_2017_英語版ファイル161220

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OurresearchgrouphasdevelopedtheCompressionShearingMethodatRoomTemperature(COSME-RT)whereinmetalpowderissimultaneouslyloadedbyashearingforceandacompressivestressinairatroomtemperaturetoformaplate.Usually,heatisnecessaryforpowdermetallurgyformingprocessessuchashotpressing.Incontrast,theCOSME-RTprocessesthepowderatroomtemperature,sograincoarseningdoesnotoccur.Asaresult,theCOSME-RTyieldsgoodmechanicalproperties.Ti-6Al-4Viswidelyusedinbiomechanicalapplications,suchasdentalimplantsandintramedullarynails.However,sincevanadium(V)isdetrimentaltoorganismsandisalsoarareearthelement,V-freebiomaterialsaredesired.COSME-RTcanbeusedtoproducepureTiplatesthatexhibithighstrengthandnanometergrainsizes,makingthismaterialausefulalternativetothecommonbiomaterialTi-6Al-4V.Compression Shearing Method at Room Temperature (COSME-RT): (a)Step 1: metal powder is first placed between a stationary plate and a moving plate in the apparatus. A compressive stress is then applied to the moving plate and maintained during the forming process. (b)Step 2: Finally, a shearing load is added to the moving plate and displaced in the shearing direction.A thin plate is fabricated in this step.Development of Materials Useful in the Fields of Medicine and Welfare The tensile strength of the Ti thin plate formed by the Compression Shearing Method at Room Temperature (COSME-RT) was found to be 3 times larger than that for the rolled Ti.ThegraduatesofNakayamalaboratoryareworkingactivelyinautomotiveindustriesormanufacturesandmetalprocessingfactories.NoboruNakayamaDr.Eng.AssociateProfessorResearcharea:Plasticworking(powdermetallurgy),Nondestructiveinspection3 timesNakayamaLabIn the FutureMechanical Systems EngineeringAfter GraduationInourlaboratory,complexfluidflowswithheat/masstransferarestudiedbynumericalsimulations.Owingtorecentgreatadvanceincomputers,wehavebeenabletoinvestigateso-calledmicrofluidicsmoreaccurately.Inparticular,thelatticeBoltzmannmethod(LBM)isapowerfulnumericalscheme,andmultiphasefluidflowssuchasdropletcollisiondynamicsandbubbleflowsaresimulatedbythetwo-phaseLBM.Moreover,bloodflowsaroundcerebralaneurysmarealsostudiedascollaborativeworkwithmedicaldoctors.Inmostcompanies,acommercialsoftwareisusuallyusedforquicksolutionoffluidflowproblems.Sometimes,however,actualcomplicatedphenomenaespeciallyinthemicrofluidicsarenotaccuratelysimulatedbyacommercialsoftware.Inthefuture,wehopethatourdevelopedcodebasedontheLBMwillbecomeausefultoolforsolvingcomplicatedproblemsinmultiphasefluidflows.Dr.MasatoYoshinoProfessorBachelorEng.-1994,MasterEng.-1997,DoctorEng.-2000,KyotoUniversity.Specialty:ComputationalFluidDynamics,LatticeBoltzmannSimulationUnder discussion on simulated results among professors and graduate students in our lab. (left); students working on their graduation studies (right).Numerical Simulation ofMicrofluidics (Multiphase Flow)Examples of simulated results: liquid-liquid two-phase slug flow in a microchannel (upper left); red blood cells passing through a throat (lower left); distribution of wall shear stress around a cerebral aneurysm at bifurcations (right).Studentsinourlaboratorymainlygointovariousindustries:automobileindustry,consumer-electronicsmaker,heavyindustry,precisionequipmentmaker,andsoon.Prof.Yoshinowouldlikethemtoopenanewfrontierinmanykindsofindustriesasamechanicalengineer.YoshinoLabIn the FutureMechanical Systems EngineeringAfter Graduation# These photos are cited by Sai+SpecialNo. 365:（URL：http://saiplus.jp/special/2016/03/365.php）Realization of Intelligent Sensing Systemsechanical Systems OurresearchgrouphasdevelopedtheCompressionShearingMethodatRoomTemperature(COSME-RT)whereinmetalpowderissimultaneouslyloadedbyashearingforceandacompressivestressinairatroomtemperaturetoformaplate.Usually,heatisnecessaryforpowdermetallurgyformingprocessessuchashotpressing.Incontrast,theCOSME-RTprocessesthepowderatroomtemperature,sograincoarseningdoesnotoccur.Asaresult,theCOSME-RTyieldsgoodmechanicalproperties.Ti-6Al-4Viswidelyusedinbiomechanicalapplications,suchasdentalimplantsandintramedullarynails.However,sincevanadium(V)isdetrimentaltoorganismsandisalsoarareearthelement,V-freebiomaterialsaredesired.COSME-RTcanbeusedtoproducepureTiplatesthatexhibithighstrengthandnanometergrainsizes,makingthismaterialausefulalternativetothecommonbiomaterialTi-6Al-4V.Compression Shearing Method at Room Temperature (COSME-RT): (a)Step 1: metal powder is first placed between a stationary plate and a moving plate in the apparatus. A compressive stress is then applied to the moving plate and maintained during the forming process. (b)Step 2: Finally, a shearing load is added to the moving plate and displaced in the shearing direction.A thin plate is fabricated in this step.Development of Materials Useful in the Fields of Medicine and Welfare The tensile strength of the Ti thin plate formed by the Compression Shearing Method at Room Temperature (COSME-RT) was found to be 3 times larger than that for the rolled Ti.ThegraduatesofNakayamalaboratoryareworkingactivelyinautomotiveindustriesormanufacturesandmetalprocessingfactories.NoboruNakayamaDr.Eng.AssociateProfessorResearcharea:Plasticworking(powdermetallurgy),Nondestructiveinspection3 timesNakayamaLabIn the FutureMechanical Systems EngineeringAfter Graduation52

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