Compressive behavior of unidirectional FRP with spacial fibre waviness and non-uniform fibre packing

摘要

Longitudinal compressive strength of common engineering FRP is known to possess large stochastic variation which highlights the importance of accurate prediction on the compressive failure behaviour. This study employs non-linear 3D FE modeling to investigate the influence of spacial fibre waviness and non-uniform fibre packing on the compressive strength of UD FRP. Cuboid shaped FE model is constructed, and a region of sinusoidal fibre waviness is introduced in the model. Fibre is considered as materially linear-elastic but geometrically non-linear, while matrix is considered as elastic perfectly plastic. The results highlight that in the fibre kinking process fibre rotation may not necessarily occur in the plane with largest preliminary fibre misalignment angle (or fibre waviness plane). The compressive strength of FRP not only depends on fibre misalignment angle but also on fibre waviness direction, while non-uniform fibre packing seems to have insignificant influence on the compressive strength.