Stress AnalysisandFailure Predictionof Adhesively BondedSingle-lapLaminates Joints Subjected to the Tensile Loading

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On the basis of the existing experimental results and considering five kinds of failure modes, failure prediction of adhesively bonded single-lap laminates joints with adherend thickness 3mm, adherend thickness 2mm and defect in the adhesive layer under uniaxial tensile loading is performed by progressive failure analysis method. The numerical analysis of composites adhesive joints is implemented in ANSYS Parametric Design Language (APDL) with commercial finite element codes ANSYS. The error of computaional and experimental failure loads is 3.0%. Evolution of adhesive progressive damage is simulated effectively and the initial position and reason of damage is discovered. Furthermore, a finite element simulation is carried out to analyze the stress distributions in the mid-surface of the adhesive layer and the bonding interface. It is found that stress concentration is all emerged near by 1.25mm on the overlap zone ends, that is the initial point of damage, and it is the main factor that the joint strength is affected by peel/shear stress concentrations at overlap zone ends. The computational results are in good agreement with the experimental values.