Designation:F1614–99AnAmericanNationalStandardStandardTestMethodforShockAttenuatingPropertiesofMaterialsSystemsforAthleticFootwear1ThisstandardisissuedunderthefixeddesignationF1614;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoversthemeasurementofcertainshockattenuatingcharacteristics,rapidrateforce-displacementrelationships,ofmaterialssystemsemployedinthemidsoleofathleticfootwearintendedforuseinnormalrunningmove-ments.Thistestmethodcoversthreedifferentproceduresforperformanceoftherapidrateforceapplication:ProcedureAforfallingweightimpactmachines,ProcedureBforcompres-sionforcecontrolledmachines,andProcedureCforcompres-siondisplacementcontrolledmachines.1.2Thematerialsystemresponseforrapidrateforceapplicationmaybedifferentforeachofthethreeproceduresofthistestmethod.1.3Thistestmethodisempiricallybasedontheuseofan8.5-kgmassdroppedfrom50mm(1.97in.)togeneratepeakcompressiveforceswhicharecomparabletothatexperiencedbyamidsoleinheelstriketestsfornormalrunningmove-ment.2,3Thisrequiresthespecimentoberigidlysupportedandtheenergytobedeliveredthrougha45-mm(1.8-in.)diameterflattup.1.4Thistestmethodimposesanimpulsetogeneratearapidratecompressiveforce-displacementhysteresiscycleandevaluatesshockattenuatingcharacteristicsofthespecimen.Themaximumenergyappliedtothespecimenoccursatpeakdisplacementandmustbewithin610%ofareferencevaluethatisusedtonormalizethedataforcomparativepurposes.1.5Shockattenuatingcharacteristics,forthistestmethod,areintermsofabsorbedenergylossduringthehysteresiscycle,peakpressure,maximumstrain,andaveragestiffness.Eachofthesecharacteristicswillhavevaryingimportance,dependingonthedesignobjectivesforthematerialsystemintheathleticfootwearproduct.1.6Testresultsobtainedbythistestmethodshallbequalifiedbythespecimenthicknessandthereferen...
