Abstract
AbstractThis study presents an interface fracture mechanics analysis of delamination failure in a multilayered beam subject to general mechanical loads and residual stresses. Analytical solutions of the energy release rate and its phase angle are obtained through a crack-tip-element analysis. Both the transverse shear and thermal residual stresses, as well as their coupling effect, are included in these solutions. Representative interface fracture specimens are analyzed using these new solutions as well as an existing one. Excellent agreement with finite-element analysis has been achieved by the present solutions, whereas the existing solution underestimates the total energy release rate significantly, because it neglects the transverse shear forces. This suggests that the present solutions can significantly enhance the accuracy of the total energy release rate and its phase angle for an interface crack in multilayered structures.
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