Effect of micro-randomness on macroscopic properties and fracture of laminates

摘要: Composite materials demonstrate a considerable extent of heterogeneity. A non-uniform spatial distribution reinforcement results in variations local properties fibrous laminates. This non-uniformity not only affects effective composite but is also crucial factor initiation and development damage fracture processes that are spatially non-uniform. Such randomness microstructure failure evolution responsible for distributions stresses specimens even under externally uniform loading, resulting, instance, random matrix cracks cross-ply The paper deals with statistical features carbon fibres transversal cross-sectional area unidirectional epoxy matrix, based on various approaches used to quantify its microscopic randomness. character the fibres’ fluctuations elastic moduli composites, bounds which depend characteristic length scale. lattice model study laminates, linking macroscopic properties, discussed. An example simulations cracking fibre/epoxy laminate given.