In this paper, a parametric finite element (FE) model has been developed to allow a broad study into
the effect of various parameters on the performance of a scarf joint. The buckling load of scarf repair composite structure
has been investigated and determined with respect to changes in scarf angle, adhesive thickness and lay-up sequence.
Furthermore,the best scarf repair model was developed. Dissimilar material joint improves the stability of scarf
repair composite structure extraordinarily. The adhesive thickness varying between 0. 15 mm and 0. 25 mm,reducing
the adhesive thickness also improves the stability of scarf repair composite structure. The scarf repair model with [03/
±45/ ±45/ 90]s has the best stability. The results of this investigation provide further insight into the failure that develops
in scarf repairs of composite structures under compressive load