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1、武汉理工大学硕士学位论文AbstractAtpresent,thedevelopmentoflargescaleshiphasbecomethemainstreamtrend,inthelong-termnavigationprocess，hullsubjectedtorepeatedalternatingload,lowcyclefatiguefractureofhullstructureoccursfrequently,ithasbecomethekeyissuesdemandingpromptsolutioninthedevelopmentoflarge-s
2、caleships.Analysisshowsthatthecracktipopeningdisplacement(CTOD)canbeusedforelastic-plasticandlargescaleyieldingandgeneralyielding.Therefore,theCTODanalysisandestimationbasedonfracturemechanicscanmorerealisticallypredictthefatiguestrengthofshiphullstructures.Basedonfracturemechanics,th
3、isprojectwillcarryouttheoreticalandnumericalresearchontheCTODofshiphullstructures.Thecracktipopeningdisplacement(CTOD)willbeappliedtothetheoreticalanalysisofelastic-plasticfracture,takingtheleadinsolvingtheprobleminthefield.Theresearchfindingsoftheprojectcouldmoreaccuratelyassessthelo
4、w-cyclefatiguedamageofshiphullstructuresunderextremeseaconditions,itisthedevelopmentonthetheoryoffatiguestrengthanalysisandapplication.Theresearchworkcanprovidemoreadvancedandreliabletheoreticbaseandanalysismethodforthepredictionoflow-cyclefatigueofshiphullstructures.Thepapermainlyinc
5、ludesthefollowingaspects:1)Theexistingfatiguecrackgrowthmechanismandthetheoreticalmodelintheworldarefullyinvested,theresearchfromtheangleoffracturemechanicsarecarriedout,themathematicalandphysicalmodelofhullstructureelastic-plasticfractureisselected,inordertobreakthroughandchangethepr
6、oblemthathullstructurefatiguerarelyinvolvestheelastic-plasticanalysisforalongtime.TheCTODascontrolparameterusedinhullstructuralelastic-plasticanalysis,atheoreticalbasisandcalculationmethodformoreaccurateanalysisofthestrengthisprovided.2)Understaticload,forelastic-plasticfractureofship
7、hullstructure,basedonthetheoryoffracturemechanics,combinedwiththesuperpositionprincipleofDugdalemodel,appliedtheCassettetheorem,theCTODtheorymodelisobtained,III万方数据武汉理工大学硕士学位论文thefractureofshipstiffenedplatedamageandbearingcapacityandprovidesabasisforthefurtherresearchandanalysis.3)Nu
8、meric
