Science of Friction–Adhesive Joints

This chapter addresses the fundamental properties of hybrid friction–adhesive joints which combine any form of mechanical tightening (stimulus for friction forces) with anaerobic adhesives. By filling the voids around the microareas of true metal-to-metal contact between the mating parts, anaerobic adhesives allow the full area involved by the engagement to be usefully exploited. Advantages ranging from sealing action, fretting suppression, noise reduction and enhanced strength derive from this combination. The focus of the chapter is on predicting the mechanical strength of these joints. The literature covering the static and the fatigue strength is reviewed showing that proper choice of the adhesive can increase the overall strength of the joint well above the strength of the purely mechanical joint based on friction only. Simple equations are also provided for the strength calculation of practical engineering assemblies.