This paper deals with torsional free vibration analysis of single lap jointed cantilevered beams. The 20-node quadratic brick, reduced integration solid elements and the 15-node quadratic triangular prism elements are used to model the single lap jointed cantilevered beams. The finite element analyses are carried out using the ABAQUS FEA Programme. Numerical examples are provided to show the influence on the torsional natural frequencies and mode shapes of the single lap jointed cantilevered beams of different characteristics of adhesives. It is shown that the torsional natural frequencies increase significantly as the Young's modulus of the adhesive increase, but only slightly change with an increase in Poisson's ratio. The mode shapes show that there are different deformations in the adhesive layer which are not present in a cantilevered beam without a joint. These deformations may cause high stresses in the adhesive layer and may initiate local cracking and delamination failures.
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