Abstract
A modified analytical model with closed-form solution is proposed in this study to investigate interfacial shear and normal stresses in adhesively bonded double-lap joints with stepped outer adherend, subjected to tensile loading. By extending some researchers' prior related works, explicit expressions for adhesive interfacial shear and normal stresses are derived, with considerations of shear deformation in the adherends and plasticity in the adhesive layer. Continuity conditions are introduced to fit the variation of the outer adherend thicknesses. To obtain unknown constants of general solutions for adhesive normal stress, some approximate boundary conditions are reconstructed and several simplifications are imposed. The adhesive stress distributions along the bondline are obtained to investigate the effects of joint's material properties and geometric parameters. Adhesive with elastic-perfect plastic behavior is also considered in the analyses. The results obtained from the present model show an excellent agreement with corresponding finite element results. The present method is applicable to implement parametric analysis and optimal design for adhesively bonded double-lap joint.
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