Nonlinear vibration analysis of carbon fiber-reinforced composites with frequency-dependence and strain-dependence: Experimental and theoretical studies

Abstract

In this paper, with 3 kinds of carbon fiber unidirectional composite beams as test specimens, a test system based on the resonance method is established to test both the frequency-dependence and strain-dependence for carbon fiber-reinforced composites. The test captures the variations of relevant mechanical parameters for carbon fiber-reinforced composites with frequency and strain under vibration load. The expressions of frequency-dependence and strain-dependence for relevant mechanical parameters obtained by testing data processing and numerical fitting are introduced into the numerical models for 2 kinds of carbon fiber-reinforced composite plates with different fiber alternating laying modes. The comparison of the results from the numerical analysis and the corresponding experimental tests verifies the correctness and applicability for the expressions describing the two dependency characteristics. Obviously, clarifying the laws of the mechanical parameters of carbon fiber-reinforced composites varying with frequency and strain has guiding significance for the design of carbon fiber-reinforced composite structures subjected to vibration loads.