Delamination damage analyses of adhesively bonded

Authors: S K Panigrahi B Pradhan

Publish Date: 2008/05/16

Volume: 148, Issue: 4, Pages: 373-385

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Abstract

Threedimensional nonlinear finite ele ment analyses have been carried out to evaluate the outofplane stresses in the adhesive layer existing between the lap and the strap adherends of the Lap Shear Joint LSJ in laminated FRP composites for varied delamination lengths The delaminations are presumed to be preembedded in the thin resin rich layer existing between the first and second plies of the strap adherend Sublaminate technique has been used to model the LSJ with the delamination Contact finite element analyses have been performed in order to avoid interpenetration of delaminated surfaces The effects of varied delamination lengths on the peel and interlaminar shear stresses and the individual modes of Energy Release Rate ERR in the delamination zones are highlighted in this paper It is seen that threedimensional effects exist near the free edges of the overlap end of the joint The delamination propagation significantly affects the stress distributions in the adhesive layer existing between the lap and the strap adherends of the LSJ The variations of interlaminar stresses and ERRs on both the delamination fronts are found to be significantly different and thus indicate that the propagation of delamination does not occur at same rate at the two delamination fronts This may throw some light to the evaluation of structural integrity of the LSJ in the presence of preembedded delaminations

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