Strength of adhesively bonded single-lap and lap-shear joints

simple solution procedure of predicting the strength of adhesively bonded single-lap and lap-shear unbalanced joints with nonlinear adhesive properties was developed by following the global/local analysis procedure developed by Goland and Reissner (1944). Simple formulas for the shear and peel strain energy rates of the joints were obtained in terms of the longitudinal membrane forces and the bending moments in the adherends after neglecting the terms related to the transverse shear forces. Two simple failure criteria were suggested and then validated by comparing to the measured failure envelopes and correlating with the measured strengths of the lap-shear and singlelap joints. It was shown that neglecting the terms related to the transverse shear forces could yield an over estimation of both energy rates for the single-lap joints with relatively stiff adhesive, c~7~ 1998 Elsevier Science Ltd. All rights reserved