Analysis of the Interaction Effect for Bonded Repairs

摘要

With the increasing use of bonded repairs to restore the structural integrity of ageing aircraft the question arises as to the interaction effects when repairs are located close together. Using the Finite Element (F.E.) method a study has been carried out for the interaction between two idealised circular repairs. The interaction involves the increase of the sheet stress just outside the patch. It has been found that the tandem orientation, with respect to the applied load, is the most severe configuration. In this case, for most practical repairs, the interaction may result in increases of the sheet stress by 40% for very close separation distances. It has also been found that certain combinations of bi-axial load can also significantly influence the interaction effect.