Finite element simulation of the micromechanics of interlayered polymer/fibre composites: A study of the interactions between the reinforcing phases

Finite element analysis has been applied to study the mechanical behaviour of composites with ductile thermoplastic and rubbery interlayers between fibres and matrix. The stress distribution in the transverse direction and the interactions between fibres was investigated with particular emphasis on the effect of varying the modulus and thickness of the interlayers. The results of the analysis show that the use of interlayers is more beneficial at higher fibre volume fractions in enhancing the energy absorbing capabilities of a polymer/fibre composite. In particular, ductile interlayers are clearly shown to have a less detrimental effect than rubbery interlayers on the modulus of coated fibre composites.