Abstarct: The need of today's industry is to use structures that, in addition to high mechanical properties, have low weight and so-called high special mechanical properties. An example of these structures is sandwich composite structures, which are widely used in defense, aviation, shipbuilding, automotive, and the like industries. One of the important and researched issues in the field of sandwich composite structures is their connection to each other or to other components of the structure. Also, a numerical analysis has been done by Abaqus software, and an experimental investigation has also been done to validate its results. By reviewing the previous studies conducted by the researchers, it was observed that a lot of research has been done on the topic of mechanical joints, but the special geometry of this structure and also the examination of the compressive strength of the joints have received less attention. Considering this issue, the single-edge screw connection with double curvature geometry is made of glass fibers and epoxy resin as the shell and edge of the connection, as well as polyurethane foam as the core of the structure in the sandwich part. The numerical analysis of this structure and the prediction of the type of failure and damage in the piece, due to the special structure of this double-curved structure, which consists of a multilxayer section and a sandwich section with a foam core, has a special complexity. In the following, by building the structure and performing the buckling test by the pressure testing machine and checking the graphs extracted from this test, it was observed that the results of the numerical analysis and the experimental test are consistent with each other.