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Interlaminar and intralaminar fracture characterization of composites under mod...

The 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...

This 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...

Application of the End Loaded Split and Single-Leg Bending Tests to the Mixed-M...

The effect of hybridization on the GFRP behavior under high velocity impact

In thepresentstudy,experimentalandanalyticalinvestigationsforthebehaviorofE-glassfiberrein- forced compositehybridizedwithalayerofKevlar29fiber,underhighvelocityimpact,wereperformed. The experimentalworkincludestheplacementoftheKevlarlayeratfourdifferentlocationstoverifythe effectsofthestackingsequenceontheimpactbehavior.Threedifferentprojectilegeometries,namely, flat-ended, hemisphericalandconicalwereused.Thee...

Numerical analysis of the Edge Crack Torsion test for mode III interlaminar fra...

A 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

The 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...

An 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...

An 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...

A studyofthemechanicalbehaviouroflaminatedcompositeadhesivejointsispresentedinthispaper. The studyconsistsofbothnumericalsimulationsandexperimentaltests.Itconcentratesonsinglelap-shear joints madeofcarbon–epoxylaminatedcompositesandanepoxyadhesive.Themainobjectiveistoverify the adequacyofcohesivedamagemodelsforthestrengthpredictionofbondedjoints.Thesemodelsare attractiveinmodellingfractureproblemssincethe...

Mode III interlaminar fracture of carbon/epoxy laminates using the edge crack t...

The modeIIIinterlaminarfractureofcarbon/epoxylaminateswasevaluatedwiththeedgecracktorsion (ECT) test.Three-dimensionalfiniteelementanalyseswereperformedinordertoselecttwospecimen geometries andanexperimentaldatareductionscheme.Testresultsshowedconsiderablenon-linearity before themaximumloadpointandasignificant R-curve effect.Thesefeaturespreventedanaccurate definition oftheinitiationpoint.Nevertheless,analyseso...