Engineering-Research-Activity2015｜SHINSHU UNIV.

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Unique material processing by lasersLaserlightisspecialbecauseitsenergyisconcentratedinaverysmallareaandaveryshorttimeframeWearedevelopingsmalldrillingandmicrogroovingmethodsusinglasers.However,materialsmeltedbylaserbeamsspreadoverandadheretotheprocessingarea;therefore,byprocessingthematerialsinchemicalsolutions,wetrytoremovethespreadmaterialssimultaneously.Combininglaserwithchemicalreactions,wearedevelopinguniquematerialprocessingmethods.Sapphiresandsiliconcarbidesareknownasnext-generationsemiconductormaterials.Theyareveryhardtobecutwithconventionaltools.Lasersareexpectedtobethesolutiontocutthesehardmaterialsbecausetheycancutanymaterialswithanyhardness.Progressiveresearchonthelaserprocessingwillfacilitatethelasercuttingofthenext-generationsemiconductormaterials.Ourresearchisexperimentalandpractical.Studentsinourlablearntorealizethecomplexityofmaterialbehaviorsandmaterialprocessingmechanisms.Doyouwanttobecomeanengineerwithasolidfoundation?Thenjoinourlab.TakashiHosonoAssistantprofessorDoctorofEngineering.Research field: laser processing, lightweight metal based nano-carbon compositesPulsed Nd:YAGlaser light is invisible; however, air is plasmarizedto flash strongly because a huge amount of energy is condensed to a focal point.A laser oscillator is set on the left corner of an anti-vibration table. An experimental equipment is lbehindthe student.HosonoLabIn the FutureMechanical Systems EngineeringAfter GraduationWestudydeformationmechanismsofnanometre-scalematerialsbymoleculardynamics(MD)simulations.Itisdifficulttoexploresuchnanometre-scalematerialsexperimentallyduetotheirsize([nm]=10-9[m]).MDisoneofatomicsimulationmethodsandcansimulatethemovementofeachatominamaterial.UsingMD,weperformdeformationsimulationsofvariousmaterialssuchascarbonnanotubesandbulkmetallicglassestorevealthedeformationpropertiesinatomicscales.Inthislaboratory,westudynanometre-scalematerialsusingcomputation-simulations.Carbonnanotubesandbulkmetallicglassesarenewmaterialsdiscoveredrecently.Wehavetounderstandthepropertiesofmaterialsinordertousetheminvariousproducts.Ourstudiesrevealessentialdeformationpropertiesofthesenewmaterials.Basedonourstudies,theymaybeutilizedinvariousfields.MasaomiNoshimuraAssistant Professor2009, Ph. D., Kobe University, Graduate School of Science and Technology. Field of study: Molecular Dynamics simulation, Solid Mechanics.Compressive simulation of defective triple-walled carbon nanotube: local buckling occurs from around the defect in defective model. Solid mechanics on nanometre-scale materials using atomic simulationsDistribution of atomic strain under the indentation simulation on bulk metallic glasses: shear bands as localization of deformation are observed below the indentation point.Graduatesareworkinginbroadfieldssuchasautoandelectronicsindustries.Inthislaboratory,studentsacquirethecomputation-simulationskillandtheknowledgeinsolidmaterials,whichwillbeveryusefulinyourfuturejobs.-0.05-0.04-0.03-0.02-0.010-50-40-30-20-100Strain , zzStress , zz, GPa(a) Depth = 2nm(b) Depth = 4nm(c) Depth = 5nm50nmAtomic strain, γ 0.0 0.5Non-defectiveDefective TWCNT at buckling pointDefectiveNishimuraLabIn the FutureMechanical Systems EngineeringAfter Graduation15

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