Prediction of strain energy of fiber reinforced cantilever beam structure under base excitation based on semitheoretical method

Semitheoretical method was proposed to predict the strain energy of fiber reinforced cantilever beam under base excitation. Firstly, strain energy analysis model of fiber reinforced composite beam structure was established. Then, the principle of semitheoretical method to predict strain energy of fiber reinforced cantilever beam was elaborated, and the corresponding prediction procedures of strain energy were also described. Finally, the vibration displacement responses of such composite beam structure under base excitation of certain level were measured and the correctness of strain energy analysis model was verified. It was proved that the semitheoretical method can be used to analyze and predict the strain energy of composite beams, and the predicted results were also compared with those of aluminum alloy beams with the same dimension parameters of such composite beams. It can be found that the strain energy of fiber reinforced cantilever beam was 24%-36% lower than that of aluminum alloy beam under the same excitation amplitude, and strain energy index indeed can be used to evaluate the damping capacity of composite structure compared with metal structure.