Mixed-Mode Cohesive Damage Model Applied to the Simulation of the Mechanical Be...

• Author(s): Marcelo Francisco de Sousa Ferreira de Moura ; Raul Duarte Salgueiral Gomes Campilho ; João Paulo M. Gonçalves
• Date: 2009
• Persistent ID: http://hdl.handle.net/10216/15181
• Origin: Repositório Aberto da Universidade do Porto
• Subject(s): Ciências tecnológicas; Engenharia; Engenharia mecânica
• Document Type: Article
• Language: Portuguese

Description

A studyofthemechanicalbehaviouroflaminatedcompositeadhesivejointsispresentedinthispaper. The studyconsistsofbothnumericalsimulationsandexperimentaltests.Itconcentratesonsinglelap-shear joints madeofcarbon–epoxylaminatedcompositesandanepoxyadhesive.Themainobjectiveistoverify the adequacyofcohesivedamagemodelsforthestrengthpredictionofbondedjoints.Thesemodelsare attractiveinmodellingfractureproblemssincetheydonotrequirethedefinitionofaninitialcrackandthey model damagepropagationwithoutanyuserintervention.Amixed-modecohesivedamagemodelisusedto simulate damageonsetandgrowthintheadhesivelayer.Themodelisanextensionofpuremode(IandII) trapezoidal cohesivedamagemodels.Thetrapezoidalshapeintheconstitutivelawismorevalidwhen ductile adhesivesareused.Themixed-modemodelrequiresacompletecharacterizationofthecohesive parameters inpuremodes,determinedwithaninversemethod.Tensiletestsareperformedforjointswith differentoverlaplengths.Itisshownthatthenumericalsimulationsrepresentwithareasonableaccuracy the mechanicalbehaviourofthejointstested.