The coefficient ofrestitution(COR)isoneofthefundamentalparticlepropertiesneededinthesetupof
discreteelementmodelling(DEM)simulations.ThemoreaccuratetheinputparametersforDEMare,the
more accuratetheresultingsimulationoutputswillbe.ThedeterminationoftheCORforspherical
particles isarelativelystraightforwardprocess,however,whenconsideringirregularshapedparticles,
the unpredictablebehaviourofparticlesafterimpactmakestheanalysisoftheCORmoreinvolved.This
paper presentsanexperimentalmethodtodeterminetheCORusinghigh-speedvideoinathree-
dimensional environmenttocapturetherandombehaviourofirregularshapedpolyethylenepellets.The
angular displacementandangularvelocityofparticlesareexperimentallydeterminedandtheprocess
used todeterminethecoefficient ofrestitutionusingvariousequationsispresented.