Tensile Property and Influence Parameters of Bonded Repaired Composite Laminates

Bonded repair is efficient and widely-used repair technique for composite structures. Tests were conducted to study the tensile property of scarf repaired and external bonded repaired composite laminates with different repair parameters. The results show that the recovery of failure strength of scarf repaired laminates is about 66%-91% while external bonded repaired laminates is about 44%-61%.When reducing scarf ratio, repairing in double sides, curing in autoclaves, the scarf repair specimens can reach a higher recovery rate of failure strength. When repairing in double sides, enlarging the size of patches, the external bonded repaired specimens can also reach a higher recovery rate of failure strength. Based on the test results, finite element models were established to predict the failure loads and failure modes of specimens, and to analyse the stress distribution and progressive damage process of specimens, which can provide a reference to the designing in the repair projects.