Investigation of vibro-impact resistance of fiber reinforced composite plates with polyurea coating with elastic constraints

Abstract

A dynamic model for fiber reinforced composite (FRC) plates with polyurea coating (PC) under four-edge elastic constraints is proposed to investigate vibro-impact resistant performance. Firstly, based on the first order shear deformation theory together with the Rayleigh-Ritz method, Duhamel integral approach and Simpson's rule, the natural frequencies and dynamic responses of PC-FRC plates subjected to an impulse excitation load are solved, which paves the way to obtaining the key index ‘dynamic stiffness’ for evaluating anti-vibration capability. Furthermore, according to the Hamilton principle, the equilibrium equations of PC-FRC plates under low velocity impact excitations are derived. By employing the Hertz contact law to calculate the impact contact force, the delamination threshold load is defined to obtain the other key index ‘impact damage area’ for estimating the impact resistance performance. Finally, both numerical and experimental results taking into account classic and elastic constraints are employed to validate the model developed here. The parametric study is also performed to provide practical guidance for achieving a better vibro-impact resistance of such composite structures.