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2024年4月13日发(作者：多态怎么实现)
SimulationoftheUltrasonicShotPeeningProcess
ler1,tzki1,e2
1MTUAeroEngines,Munich,Germany
2InstituteforMaterialsScienceandEngineeringI,UniversityofKarlsruhe,Germany
ABSTRACT
Ultrasonicshotpeening(USP)isanovelprocesssuitablefortheshotpeeningof
,unlikeconventionalshotpeening
wheretheshotispropelledbycompressedair,theshotisenergizedbyasonotrode
lreadyexistsalargebodyofliterature
emainsdifficulttodevelopthe
processforaspecificpurpose,withproblemsrangingfromchamberdesignto
,comprehensiveexperimentalinvestigationsare
,peeningresultsoncomplex
componentgeometriesrevealthatthemotionoftheshotandhencethewaythe
osetoclosethatgapbydeveloping
appreciablyreducetheexperimentaleffortrequiredfortheoptimizationof
inengineconstruction,optimizationoftheprocessvariableswill
afforddistinctadvantages,consideringforinstancethatpeeningintensity,a
characteristicusedforprocesscontrol,canbedeterminedinadvanceacrossthe
ulationwillalsopermittoestimatecomponent
peeningtime.
KEYWORDS
Ultrasonicshotpeening(USP),numericalsimulation,shotvelocity,peeningintensity,
peeningtime
INTRODUCTION
Conventionalshotpeeningisaverypopularmechanicalwork-hardeningprocessand
cecomponentgeometriesare
growingevermorethin-walledandcomplex,theymakework-hardeningby
where,providedallcomponentareasare
accessibleinthefirstplace,thehigh,localenergydensityinputoftheshotstream
wingnumberofsuchdifficult-to-
peencomponents,whichinservicearesubjecttohighthermomechanicalstresses,
explainstheneedforpeeningtechniquestosupplementconventionalshotpeening.
Inthissituation,ultrasonicshotpeeningholdsgreatpromiseofnovelavenuesin
engineconstruction.
thistime,neithertheexactphenomenaappearingduringtheprocessnortheeffects
entificanalysisofwhether
thistechniqueissuitableforlargeorverycomplexcomponentgeometriessuchas
blisks(integrallybladeddiscs)wasalsoentirelyneglected,ands,ittakes
elaborateexperimentingtolearnwhetherthedesiredpeeningresultscanbe
obtainedoncomponentsurfacesofcomplexshapes.
Inafirststep,throughanexperimentalanalysisoftheeffectofallpotential
influencingfactorsonthepeeningresult,abasicunderstandingoftheUSPprocess
sofpeeningintensity,whichisacommonmeasurefor
monitoringpeeningprocesses,theactionofthework-hardeningprocesscanbe
describedinasimplifiedmanner.
Representationofshotmotioninanumericsimulationmakesitpossibletopredict
viatestheneedfor
comprehensivepreliminarystudiestobeconductedespeciallyoncomplex
ralleffortexpendedinthedevelopmentofpeening
processescanappreciablybereducedbyacquiringanin-depthunderstandingofthe
onally,fortheindustrial
applicationoftheprocess,itisimportantthatthetimeneededtotreatacomponent
fashion,itcanswiftlybeassessedwhethertheprocesscan
bedevelopedcost-effectivelyunderthegivencircumstances.
METHODS
Fortheexperimentalinvestigations,achamberconfigurationwasselectedthat
romthevibration
amplitudeofthesonotrode,thetypeofshot,theamountofshotinthechamberand,
forinstance,manner,it
wasinvestigatedhowvariationsinthechamberscrosssectionandthedistance
betweencomponentandsonotrodesurfaceaffectthemeasuredpeeningintensity.
Theresultsobtainedrevealthatpeeningintensityvariesverydistinctlywiththe
ering
saturationtimes,whicharedeterminedalongwithpeeningintensity,thecomponent
distance,theamountofshotandagainthevibrationamplitudeplaymajorroles.
Accordingly,fordevelopingtheprocess,aproblemdescriptionresultsthathas
severalvariables.
However,thequestion,howexactlytheshot
movesinsidethechamber,remains
definestheaimofthenumericalsimulation
software,
simulationprogramneedsinformationabout
thechamberandcomponentgeometriesto
beprovidedbydrawingsfromCAD(Figure
1).Alsothepropertiesoftheshot,the
vibrationcharacteristicsofthesonotrode
andthecoefficientsofrestitutionoftheshot
interactingwiththechamberandcomponent
aretobedefined.
Sinceinthissimulationthefocusissolelyon
describingtheshotmotion,theeffectofthe
shotimpactsonthepropertiesofthe
componentmaterialisnotaprimary
concern.
Figure1:Peeningchamberofthe
experimentalsetupfromCAD-file
mustbetransformedintoascatter-
plot.
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