modelling the performance and durability of welds with ansys and n code cutdown
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ModellingthePerformance&DurabilityofWeldswithANSYS&nCode
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Agenda• OverviewofWeldingonFaBgue
• DefiniBonofStressMeasuresforSeamWelds
• SeamWeldAnalysisMethods– Volvo/ChalmersMethod– ASMEBoiler&PressureVesselCodeVIII,Div2.– BS7608,AWS,EurocodeExamples:– Flatplatetransversefilletweld– TubularpipeintersecBonweldedjoint– VibraBonfaBgueofaweldedtransformermounBngbracket
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EffectofWeldingonDurability
Parent plate Fusion zone Heat affected zone
Weld toe
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Volvo/Chalmers/nCodemethod
E(i)
E(j)
σ⊥Α
σ⊥Β
sheet B
sheet A
tB
t A
effective throat, a
• Sheetsandweldsmodeledpredominantlywithrectangular4or8nodedshells
• Sheetsdescribedbymeansurfaces• ThicknessofweldelementsequalseffecBvethroat,or
around2xsheetthickness• Elementlengthofabout5mm• Smallradiinotmodeled
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Damageparameter(stress)definiBon
DamageparameterisusuallyeithertheAbsMaxPrincipalstressorCriBcalPlanestressatweldtoe
Stressescanbedeterminedbasedoneither:
• Forcesandmomentsatnodesalongweldtoe
• ThenodaldisplacementsandrotaBonsoftheweldtoeelements
Forces/moments > Stresses
Displacement/rotaBon>Strains > Stresses
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DamageStressCalculaBon
σtop
σbot
σtop
σbot (insamedirec@onasσtop)
AbsMaxPrincipalexample
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SN curve interpolation using bending stress ratio
“flexible”orbendingloadingcondiBons(r=1)“sBff”ormembraneloadingcondiBons(r=0)
Flexiblejointshavemorebendingatweldtoe
SBffjointshavelowerfaBguestrength
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Structural stress history and bending stress ratio calculated at weld location
• CalculatethestresstensorateachpointalongtheStressClassificaBonLine(SCL)byinterpolaBonofthefiniteelementnodalnormalstresses(σxxi,σyyi,σzzi, τxyi, τyzi, τxzi)definedintheglobalX,Y,Zaxes
• TransformthestresstensortotheweldlinereferencesystemdefinedbyVt,VeandVn.ThestresscomponentsintheplaneperpendiculartoVnareσf,σee,andτte
• Calculatemembrane(σf,m,σee,m,τte,m)andbending(σf,b,σee,b,τte,b)stressesintheVt/Veplane
• Calculatethemembraneandbendingstressesonthetopandbofomsurfaces
Top BoGom
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Tubularweldedjoint• TwocircularintersecBngpipes,solidseamweldcomparisonwith
experimentalresults
CourtesyG.MenegheO,DepartmentofMechanicalEngineering,UniversityofPadova,viaVenezia1–35131Padova(Italy)
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