Size-dependent bending modulus of fibre composite laminates comprising unidirectional plies

Heterogeneous materials can show size-dependent behaviour in which the bending modulus depends on sample size. In fibre composite interaction between and matrix lead to such a size effect.Then effective calculated by rule of mixtures either underestimate or overestimate laminate, depending fibre/matrix material mismatch, microstructural morphology (fibre distribution) laminate thickness. this work, comprising unidirectional plies is considered using Euler-Bernoulli beam theory influence investigated. The each ply used formulate overall laminate. results that number plies, fibres through thickness ply, spacing radius, mismatch properties ply. Our analysis shows accounting for microstructure radius per ply) 10% difference predicted three when there are less than four