Effective torsional stiffness of composite shafts reinforced by functionally-graded fibres

In this paper, a fibre-reinforced composite shaft is considered, comprising functionally graded, cylindrically-orthotropic, parallel fibres embedded into a homogeneous isotropic matrix. The aim of the analysis is to determine the effective torsional stiffness of the shaft and the shear stresses at the fibre-matrix interface. In particular, the main issue is to understand how these quantities depend on the grading features of the fibres.

In questo lavoro si considera un albero a torsione in composito fibrato a matrice isotropa e fibre cilindriche parallele all’asse, in materiale a gradazione funzionale cilindricamente ortotropo. Si determina la rigidezza torsionale omogeneizzata dell’albero e l’assetto delle tensioni tangenziali all’interfaccia fibra-matrice, in funzione dei parametri di gradazione funzionale del materiale costituente le fibre.