Finite Element Analysis of Interlaminar Stresses for Composite Laminates Stitched Around a Circular Hole

摘要

An approach is proposed to numerically study the composite laminates stitched around a circular hole. The local structure of stitching region is simplified and the finite element analysis (FEA) is carried out. With this approach, the interlaminar stresses are calculated, and the effects of stitching parameters such as edge distance, stitching needle span and row spacing of yarn are discussed on the interlaminar stresses. The effect of the reinforcement can be enhanced by properly reducing the edge distance or needle span when stitching at the hole edge. Compared with unstitching, there is an evident decrease for interlaminar stresses at the hole after stitching enforcement. The distribution of the interlaminar stresses around the hole is related with layers.