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                             Studyonthecouplingeffectandfailuremechanism ofmeshfabric
                                                reinforcedpolyureacoating
                                     LIBingqi,ZHANGJilei,LIUXiaonan,MENGTianyi
                       (StateKeyLaboratoryofSimulationandRegulationofWaterCycleinRiverBasin,ChinaInstituteofWaterResources
                                           andHydropowerResearch ,Beijing 100038,China)


                  Abstract:Polyureaisanexcellentcaulk - sealingandsurfaceanti - seepagematerial.Compositecoatingcomposed
                  ofpolyureaandmeshfabriccanbefoundinsomeprojects.However ,thiscombinationisonlyasimpleimitationof
                  thetraditionalpolyurethane - mesh - fabriccompositecoatingstructure.Researchonthecouplingbehaviorand
                  failuremechanismofthiscompositecoatingcanrarelybefound.Problemssuchaspeeling,hydrolysis,andpoor
                  durabilityoccurred.Thisstudyinvestigatedthecouplingeffectbetweenthemeshfabricandpolyureasubstrate ,and
                  exploredthemechanicalbehaviorandfailurepatternofmeshfabricreinforcedpolyureacoating.Thedeformation
                  behaviorandload - carryingcapacityofdifferentmaterialcombinationswerealsoanalyzed.Themainconclusions
                  areasfollows :Fabricfiberfractureleadstoinstantaneousstresspulseinthepolyureasubstrate,fiberfracturesur
                  faceandstress - pulse - inducedmicrocracksleadtotheoverallcross - sectionpull - offfailure.Thepolyureamaterial
                  exhibitsahigherstrength.Meshfabricinduceddefectsleadstoanelongationdecreaseofmorethan75%.The
                  meshfabriccouldunderminethestrengthanddeformationcapacityofthepolyureasubstrate ,playinganegative
                  roleonthematerialperformance.Thepolyurethanematerialgenerallyexhibitsalowerstrength.Themeshfabric
                  couldincreasethetensilestrengthby14%.Themeshfabriccouldincreasethestrengthofthepolyurethanecoating
                  substrate ,bringingacertainstrengtheningeffect.However,thebreakelongationcouldalsobedecreased.Asthe
                  elongationandstrengthofthemeshfabricdominatesthatofthecompositecoating ,inpracticalengineeringapplica
                  tions,themeshfabricshouldnotbeadoptedwhenmeetingthefollowingconditions:(a)thecoatingelongationre
                  quirementsarehigherthanthatofthemeshfabric ;(b)thesubstratematerialstrengthisgreaterthanthemeshfab
                  ric ;(c)thesubstratematerialstrengthisgreaterthanthecoating - substratetangentialbondingstrength(e.g.
                  3.2MPaforconcretesubstrate ).Atpresent, thephysicalandmechanicalpropertiesintheexistingpolyurea
                  relatedstandardsandspecificationsareproposedwithoutadoptingmeshfabric.Thematerialpropertiesproposedin
                  therelatedstandardsandspecificationscanalsomeetthecorrespondingconditionsfornotusingmeshfabricpro
                  posedinthisstudy.Thus ,meshfabricshouldnotbeusedwithpolyurea.
                  Keywords:meshfabric;polyurea;meshfabricreinforcedpolyureacoating;detailedmodel;tensiletest


                                                                                    (责任编辑:韩 昆)






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