Analysis of Bonded Shrink Fitted Joints Under Push-Off Forces: The Effect of Joint Size on the Joint Strength

Abstract

Abstract Shrink fitted joints have been widely used in mechanical structures. Recently, joints combining shrink fitted with an anaerobic adhesive have been developed in order to increase the joint strength. This joint is named the bonded shrink fitted joint. In this paper, push-off tests were carried out to measure the joint strength of bonded shrink fitted joints. In addition, the strength of the shrink fitted joints without the anaerobic adhesive was also measured. In the experiments, the effect of shrinking allowance, the outer diameter of the shafts, and the engagement length on the joint strength are examined. In addition, the size effect of joints is also examined in the experiments taking into account the surface roughness, and the roundness. The stress distribution of the joints subjected to a push-off load is analyzed using axisymmetrical theory of elasticity as a four-body contact problem. Using the stress distribution, the joint strength is estimated. The experimental results are in a fairly good agreement with the numerical results. It is found that the push-off strength of the bonded shrink fitted joints is greater than that of the shrink fitted joint.