Joining components by using adhesives is becoming more popular with the development of adhesives with high adhesion properties. These components are often subjected to dynamic loading, which may cause initiation and propagation of failure in the joint. In order to ensure the reliability of these structures, their dynamic response and its variation with the presence of defects in the bonded area, must be understood.

Dynamic response of a single lap joint subjected to an out of plane harmonic force is evaluated. The bonded joint is modeled as Euler Bernoulli beams, joined with an adhesive and constrained at one end and subjected to a harmonic force at the free end. The results show that the system response is not sensitive to a range of adhesive loss factor of 0-1. Furthermore, the system response is little affected by the presence of void in the bond area. The system response seems to be more sensitive to the void location than to its size.

Peel and shear stress in bond area are obtained and found to be confined to the edge of the overlap. For adhesive and adherents properties and geometry investigated the maximum peel and shear stress in the bond area are little affected with the presence of a central void which covers less than 60% of the over lap length for all range of frequency. However, when the frequency of the applied load is close to the natural frequency of the structure, a void increases both maximum peel and shear stress.

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