简介:Humanheadimpactinjuriescausedbyasuddenimpactforceareverycommoninaviationlifesaving,carcrashaccident,warorsportsactivities.Yet,anintriguingexampleofnatureiswoodpeckerwhichisfreefromheadinjuryevenitdrumstrunkcontinuallyataspeedofabout6-7m/sandadecelerationofabout1000g.Woodpeckermusthavespecialcharacteristicstoattenuaterepetitiveimpactforcetosustainrapidpeckingwithoutbraininjury.Inthisstudy,theeffectofmechanicalpropertyofcranialboneonthebrainduringimpactwasinvestigatedusingthefiniteelement(FE)approach.Itwasdemonstratedthatthepressure,Von-Misesstressesandshearstressatthesamepointontheposteriorofwoodpecker'sbrainweredecreasedgreatlycomparedwithhoopoeandlark.Itwasstatedthatthehigherstrengthofwoodpecker'scranialbonemightplayanimportantroleforpreventingwoodpecker'sheadinjury.