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HlAlBlplpcLnpp1poPcPmaxPmeanRtfVowWbWfWf1WfoWgWlf

APPENDIXNotationCfDDmaxDminEEkGh

maximumpermanentdeformationoffoundationatimpactlocationoutsidediameterofpipe

maximumdiameterofdeformedpipeatimpactlocation

minimumdiameterofdeformedpipeatimpactlocation

Young’smodulusofpipe

initialimpactenergy,1=2GVo2massofindenter

freedropheightofindenter

wallthicknessofpipe

totalrelativehorizontaldisplacementofpointsAshowninFig.3(a)

totalrelativehorizontaldisplacementofpipeslidingoutoftheclampsmeanplastichingelengthcriticalvalueoflp

half-distancebetweentwosupportsofpipe

numberofreboundsofindenterinternalpressure

internalpressureafterimpacttestinternalpressurebeforeimpactteststaticplasticcollapseloadforapipewithoutafoundation

maximumvalueofconcentratedimpactforce

averagevalueofconcentratedimpactforce

meanradiusofpipe

totalresponsetimein niteelementanalysiswhenthemotionceasesinitialimpactvelocity

moisturecontentofsoilfoundation

totaldisplacementofpipebottomsurfaceattheimpactlocation,WfoþDmin2Dtotalmaximumpermanenttransverseplasticdisplacementofpipeattheimpactlocation,WlþWg

valueofWfafterunclampingvalueofWfbeforeunclamping

globaldeformationofpipeatimpactlocation

localdeformationofpipeatimpactlocation

dimensionlessvalueofWf,Wf/Hmaximumaverageaxialplasticstrainacrosspipewallthickness

staticuniaxialtruerupturestraindimensionlessvalueofEk,Ek/PcHcriticalvalueofl

dimensionlesscriticalmeanlengthofplastichinge,lpc/2R

staticuniaxialtruerupturestressofpipestaticuniaxialyieldstressofpipe

circumferentialstressinpressurizedpipe,pR/H

1max

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Proc.IMechEVol.220PartE:J.ProcessMechanicalEngineering

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