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Interlaminar and intralaminar fracture characterization of composites under mod...
Marcelo Francisco de Sousa Ferreira de Moura; Raul Duarte Salgueiral Gomes Campilho; A. M. Amaro; P. N. B. ReisThe interlaminar and intralaminar fracture of laminated composites under mode i loading was studied using the double cantilever beam test. the effect of bridging on the measured fracture energy was assessed by cutting fibres during crack propagation. the fracture energy was evaluated considering a pre-viously developed data reduction scheme based on the beam theory and crack equivalent concept. the model only r...
Numerical prediction on the tensile residual strength of repaired CFRP under di...
Raul Duarte Salgueiral Gomes Campilho; Marcelo Francisco de Sousa Ferreira de Moura; Joaquim DominguesThis work presents a two-dimensional numerical analysis to assess the influence of several geometric changes on the tensile residual strength of repaired CFRP composite plates. The model was validated by comparison with previously published experimental results. Single- and double-lap repair techniques were evaluated. The geometric changes include chamfering the patch outer face, thickening the adhesive near th...
Numerical analysis of the Edge Crack Torsion test for mode III interlaminar fra...
Marcelo Francisco de Sousa Ferreira de Moura; Maria Victoria Castro Fernandez; Alfredo Balacó Morais; Raul Duarte Salgueiral Gomes CampilhoA detailed numerical analysis of the edge crack torsion test was performed to verify its adequacy for the mode iii interlaminar fracture characterization of composite laminates. a new data reduction scheme based on specimen compliance was proposed. three-dimen- sional ï¬ nite element analyses including a cohesive damage model were performed in order to evaluate the accuracy of perceived giiic values obtained wi...
Buckling Behaviour of Carbon–Epoxy Adhesively-Bonded Scarf Repairs
Raul Duarte Salgueiral Gomes Campilho; Marcelo Francisco de Sousa Ferreira de Moura; Dimitra Ramantani; J. J. L. Morais; J. Sabino DominguesThe presentworkisdedicatedtotheexperimentalandnumericalstudyofthebucklingbehaviourunderpure compression ofcarbon–epoxyadhesively-bondedscarfrepairs,withscarfanglesvaryingfrom2to45◦. The experimentalresultswereusedtovalidateanumericalmethodologyusingtheFiniteElementMethod and amixed-modecohesivedamagemodelimplementedintheABAQUS® software.Theadhesivelayer wassimulatedusingcohesiveelementswithtrapezoid...
Tensile behaviour of three-dimensional carbon-epoxy adhesively bonded single- a...
Raul Duarte Salgueiral Gomes Campilho; Marcelo Francisco de Sousa Ferreira de Moura; Dimitra Ramantani; José J. L. Morais; J. Sabino DominguesAn experimentalandnumericalstudyofthetensilebehaviourofthree-dimensionalcarbon-epoxy adhesivelybondedstraprepairsispresented.Experimentally,thefailuremode,elasticstiffnessand strength wereevaluatedfordifferentoverlaplengthsandpatchthicknesses.Thenumericalsimulations, performedinABAQUSs, allowedobtainingtheelasticstiffnessandthepatchdebondingload,usedto understandtherepairsbehaviour.Theadhesivelayerwassimulatedw...
Fracture behaviour of damaged wood beams repaired with an adhesively-bonded com...
Raul Duarte Salgueiral Gomes Campilho; Marcelo Francisco de Sousa Ferreira de Moura; Ana Maria Jacinto Pina Barreto; José J. L. MoraisAn experimental and numerical study is presented concerning the fracture behaviour of scaled specimens of wood beams repaired with a carbon–epoxy patch under four-point bending.In this work,a numerical technique is proposed to simulate the fracture behaviour of these repairs,which includes the possibility of cohesive failure in the adhesive layer,failure with in the wood beam in different planes,and inter...
Mixed-Mode Cohesive Damage Model Applied to the Simulation of the Mechanical Be...
Marcelo Francisco de Sousa Ferreira de Moura; Raul Duarte Salgueiral Gomes Campilho; João Paulo M. GonçalvesA studyofthemechanicalbehaviouroflaminatedcompositeadhesivejointsispresentedinthispaper. The studyconsistsofbothnumericalsimulationsandexperimentaltests.Itconcentratesonsinglelap-shear joints madeofcarbon–epoxylaminatedcompositesandanepoxyadhesive.Themainobjectiveistoverify the adequacyofcohesivedamagemodelsforthestrengthpredictionofbondedjoints.Thesemodelsare attractiveinmodellingfractureproblemssincethe...
Single-Lap Joints of Similar and Dissimilar Adherends Bonded with an Acrylic Ad...
Arnaldo Manuel Guedes Pinto; A. G. Magalhães; Raul Duarte Salgueiral Gomes Campilho; Marcelo Francisco de Sousa Ferreira de MouraIn this study,thetensilestrengthofsingle-lapjoints(SLJs)betweensimilarand dissimilar adherendsbondedwithanacrylicadhesivewasevaluatedexperimen- tally andnumerically.Theadherendmaterialsincludedpolyethylene(PE),poly- propylene (PP),carbon-epoxy(CFRP),andglass-polyester(GFRP)composites. The followingadherendcombinationsweretested:PE=PE, PE=PP, PE=CFRP, PE=GFRP, PP=PP, CFRP=CFRP, andGFRP=GFRP. Oneoftheobjectivesof...
Modelling the tensile fracture behaviour of CFRP scarf repairs
Raul Duarte Salgueiral Gomes Campilho; Marcelo Francisco de Sousa Ferreira de Moura; Arnaldo Manuel Guedes Pinto; José J. L. Morais; J. Sabino DominguesAn experimental and numerical study concerning the tensile behaviour of adhesively-bonded carbon-epoxy scarf repairs is presented, using scarf angles ranging from 2° to 45°. A mixed-mode cohesive damage model adequate for ductile adhesives was used to simulate the adhesive layer. The cohesive laws of the adhesive layer, composite interlaminar and composite intralaminar (in the transverse and fibre directions) i...
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