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The dynamic response of boned joint for composite beam under pulse load was studied theoretically and experimentally. In the theoretical part, the validity of the theoretical model for evaluating natural frequencies, mode shape and dynamic response of boned joint composite beams at various types of bond line configuration has been examined by utilizing of the finite element technique. The finite element results indicated that the deformation mechanism of the boned joint composite beam depends on mechanical properties of the adhesive material. The mathematical finite element model is represented by introducing unified mechanical parameters to compute efficiently the Eigen-nature for composite bonded structures. In the experimental part, the response of fiberglass-reinforced polyester composite specimens with various types of bond line configuration and five lamina orientations were measured by hammer test technique "frequency response function" (FRF). The comparison between experimental and numerical model shows the efficiency of the proposed mathematical model of the composite structural beam with bonded joints. The results show that the changes of the dynamic response provide a proper indicator for predicting the current state of adhesive bonded joint.

DYNAMIC RESPONSE OF AN ADHASIVE BONDED JOINT FOR COMPOSITE STRUCTURE