In this report, adhesive strength criteria are investigated experimentally and analytically. Both the cylindrical butt joint specimen subjected to various combined tensile and torsional loadings and the round bar butt joint specimen with various angles of interface edge are used for the experiments. Temperuture dependency is also investigated. Principal stress, principal strain and von Mises stress distributions at the adhesive interface of these specimens under the critical load are obtained

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... the elasto-plastic finite element analysis using MARC. As a result, the mean value of von Mises stress distribution at the singularity area is found to be the most dominant factor of adhesive strength for the case with stress singularity area. This fact is confirmed also for the strength evaluation of the double lap joint subjected to tension through the additional examination and the corresponding three dimensional elasto-plastic FEM analysis. The critical von Mises stress can be obtained directly by a usual experimental method using a cylindrical butt joint specimen under torsion without any numerical analysis.