Conception d'un ancrage par collage optimisé Utilisation de la dépendance du comportement de l'adhésif vis-à-vis de la pression hydrostatique

Structural adhesive bonding is getting very popular in civil engineering either for strengthening operations involving the bonding of external reinforcements or to replace traditional assembly techniques in new structures. However adhesive bonding induces stress concentrations at the edges of the joint, and many studies were undertaken in order to reduce these phenomena and increase the capacity and service life of the assembly. A crucial issue is to optimize shear stress transfer in adhesively bonded joints. This paper investigates the role of hydrostatic pressure on the ultimate capacity of epoxy adhesives used in civil engineering. This led us to investigate a new curved joint geometry that naturally creates compressive stresses at the edge of the joint. In a first part, classical modelling is conducted to determine how the geometry affects the stress field within the joint. Then, fracture mechanics is used to investigate crack propagation. Complementary experimental investigations are finally presented, i.e., quasi-static tests which compare classical shear lap joints to curved joints. Experimental results are thus exploited using the abovementioned modelling.