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基于内聚力模型的沥青混凝土疲劳损伤数值研究(英文).docx

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基于内聚力模型的沥青混凝土疲劳损伤数值研究(英文) ResearchonFatigueDamageNumericofAsphaltConcreteBasedonCohesionModel Abstract Fatiguedamageisacommonprobleminasphaltconcretepavements,whichcancauseseriousdamagetothepavementstructureandshortentheservicelifeofthepavement.Inordertostudythefatiguedamageofasphaltconcrete,thispaperproposesafatiguedamagenumericalmodelbasedonthecohesionmodel.Thecohesionmodelnotonlydescribesthemechanicalpropertiesoftheasphaltmixture,butalsoconsiderstheinterfacialbondingstrengthamongasphalt,aggregates,andair-filledvoids.Themodelwasverifiedbyfatigueperformancetestsofasphaltconcrete.Theresultsshowedthatthefatiguenumericalmodelbasedonthecohesionmodelcouldaccuratelypredictthefatiguelifeofasphaltconcrete. Keywords:Fatiguedamage,asphaltconcrete,cohesionmodel,interfacialbondingstrength,fatiguelife. 1Introduction Asphaltconcreteisthemostcommonlyusedpavementmaterialduetoitsexcellentperformanceintermsofweatherresistance,durability,andeaseofconstruction.However,withincreasingtrafficvolumeandloads,thefatiguedamageofasphaltconcretehasbecomeacommonprobleminpavementengineering.Fatiguedamageiscausedbyrepeatedloadingandunloadingofthepavementundertrafficloads,andcanleadtocracking,rutting,andotherformsofstructuraldamage,shorteningtheservicelifeofthepavement. Manyresearchershaveproposedfatiguemodelstopredictthefatiguedamageofasphaltconcrete.Theclassicalmodelsincludethelinearelasticmodel,thenonlinearelasticmodel,andtheviscoelasticmodel.However,thesemodelsaremostlybasedontheempiricalfittingoftestdata,anddonotconsidertherealmechanicalbehavioroftheasphaltmixture.Inordertoaccuratelypredictthefatiguelifeofasphaltconcrete,anumericalmodelbasedonthecohesionmodelisproposedinthispaper. 2Cohesionmodel 2.1Basicassumptions Thecohesionmodelassumesthatasphaltconcreteisathree-phasecompositematerialcomposedofasphalt,aggregates,andair-filledvoids.Thebasicassumptionsofthecohesionmodelare: (1)Asphaltconcreteisacompositematerialwiththreephases,andtheinteractionbetweeneachphaseisbasedontheinterfacialbondingst