A Robust structural stress method for fatigue analysis of offshore marine structures

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1、ARobustStructuralStressMethodforFatigueAnalysisofOffshore/MarineStructuresP.DongCenterforWeldedStructuresResearch,Battelle,Recentrapidadvancesindevelopingmesh-insensitivestructuralstressmethodsaresum-Columbus,OH43016-2693marizedinthispaper.Thenewstructuralstressmethodshavebeendemonstr

2、atedtobee-mail:dongp@battelle.orgeffectiveinreliablycalculatingstructuralstressesthatcanbecorrelatedwithfatiguebehaviorfromsimplewelddetailstocomplexstructures.Asaresult,amasterS±NcurveapproachhasbeendevelopedandvalidatedbyalargeamountofweldS±Ndataintheliterature.Theapplicationsofthep

3、resentstructuralstressmethodsinanumberofjointtypesinoffshore/marinestructureswillbeillustratedinthispaper.Theimplicationsonfutureapplicationsindrasticallysimplifyingfatiguedesignandevaluationforoffshore/marinestructureswillalsobediscussed,particularlyforusingverycoarse®niteelementmesh

4、designsinshipstructures.@DOI:10.1115/1.1854698#IntroductionTheNewStructuralStressMethodHotspotstressbasedfatiguedesignapproachhasbeenusedforThebasicconceptwasgiveninDongetal.@2#andsomeaddi-manyyearsinoffshoretubularstructures.Suchanapproachhastionalvariationsofthenumericalproceduresfo

5、rusingeithersolidreceivedanincreasingattentionforapplicationsinweldedplateorshellelementmodelswasrecentlydiscussedbyDongetal.jointssuchasthoseinshipstructures,sincethetraditionalweld@3±6#.Theessenceofthemethodwasbasedonthefollowingclassi®cationapproachrequiresthedeterminationofnominal

6、considerationsforfatigueevaluationsofweldedjoints:stressesforagivenjointgeometryandloadingmode,bothofa.Itwaspostulatedthatstressconcentrationatafatiguepronewhichcanbedif®culttode®neinrealisticstructures.Therepre-location,suchasaweldtoeasshowninFig.1~a!,canberepre-sentativeresearcheffo

7、rtsalongthislinecanbefoundin@1#bysentedbyanequilibrium-equivalentsimplestressstate@asshownFricke@1#forarecentevaluationoftheconventionalhotspotinFig.1~b!#andself-equilibriumstressstate@asshowninFig.stressapproachandin@2#byDongetal.forintroducinganew1~c!#.Theformerdescribesastressstate

8、corre