Summary
Arbitrarily nonlinear stress-strain behaviour in both shear and peel for adhesive are utilised to formulate two coupled nonlinear governing equations for an adhesive-adherend sandwich of single-lap type. For a balanced adhesive-adherend sandwich, the two equations can be integrated, and simple formulas for bond strength are developed for characterising pure shear, peel and mixed failure in adhesive. These formulas define the bond strength in terms of the maximum strain energy density in the adhesive. It is shown that the product of the adhesive strain energy density and the adhesive thickness is equal to the energy release rateJ of mode I, mode II and mixed fracture.
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Tong, L. Bond strength for adhesive-bonded single-lap joints. Acta Mechanica 117, 101–113 (1996). https://doi.org/10.1007/BF01181040
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DOI: https://doi.org/10.1007/BF01181040