Abstract
Based on the material nonlinearity of carbon fiber reinforced composites (CFRC) obtained in previous work, including frequency and strain dependence of material parameters, the nonlinear dynamical behaviors of the bolt-connected CFRC plate are further studied in this paper. A joint parameter identification method for a bolt-connected CFRC thin-walled structure is proposed, which can accurately identify the nonlinear mechanical parameters of the joint interface while removing the influence of the CFRC-material nonlinearity. A combined nonlinear parameter tracking model is proposed to capture the CFRC-material and joint nonlinearity of a bolt-connected CFRC thin-walled structure. Specifically, a bolt-connected CFRC plate is taken as an analysis case, and the nonlinear time domain responses are solved by the Newmark method. Meanwhile, the mechanism of nonlinear mechanical behavior for the joint under different forced vibration states is further explained by obtaining the periodic variation law of joint parameters. The nonlinear dynamics analysis for the bolt-connected CFRC plate shows that: The proposed combined nonlinear parameter tracking model effectively tracks material parameters and joint parameters, and the proposed simplified joint model can effectively simulate the mechanical behavior of micro-slip and macro-slip of the joint through parameter tracking. Considering the influence of combined nonlinearity, the dynamical model of the bolt-connected CFRC plate can accurately reproduce nonlinear vibration responses observed in the experiment.
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