简介:ThetransientresponsetolongitudinalimpactofflexiblerodswithHertzcontactiscloselyrelatedtotheextentofdeformationswithdifferentimpactparameters.BymeansofLS-DYNA,fordifferentradiusanddifferentspeeds,thelongitudinalimpactofahammerwitharoundedendonadrillrodisnumericallysimulatedinthisarticle.Simulationsdemonstratethatthereisanobviousdif-ferencebetweenanalyticalsolutionandnumericalsolutiononconditionofshortcurvatureradius.Inthecircumstancecontactpressureincreases,theboundaryoftheyieldzoneexceedsthatofthecontactzone,andthesignificantplasticdeformationreducestheintensityofcontactpressurepulse.Contactforce-timecurvesinloadingandunloadingphasesshiftdown.Thenumericalsolutionisingoodagree-mentwithanalyticalsolutiononconditionoflargecurvatureradiusandimpactspeeds.Thedeforma-tionofyieldregionisconstrainedbythesurroundingelasticregionandnosignificantplasticdeforma-tionappears.
简介:
简介:Thispaperpresentsatheoreticalmodelonthenormal(head-on)collisionbetweensoft-spheresonthebasisofelasticloadingoftheHertzcontactforcompressionprocessandanonlinearplasticunloadingforrestitutionone,inwhichtheparametersallaredeterminedintermsofthematerialandgeometriconesofthespheres,andthebehaviorsofperfectelastic,inelastic,andperfectplasticcollisionsappearedintheclassicalmechanicsarefullydescribedonceavalueofcoefficientofrestitutionisspeci...