AXISYMMETRICAL STRESS-ANALYSIS AND STRENGTH OF BONDED SHRINK-FITTED JOINTS SUBJECTED TO PUSH-OFF FORCES

Shrink fit has been used commonly for joining the cylindrical componen ts such as shaft and gears. It is noted recently the shrink fitted joi nt with anaerobic adhesives is adopted in order to improve it's joint strength. In a reliable design of bonded shrink fitted joints, it is n ecessary to know the contact stress distributions at the interfaces. I n this paper, the interface stress distribution of bonded shrink fitte d joint under push-off force is analyzed by using axisymmetric theory of elasticity as four-body contact problem. Analogical test is conduct ed to determine the relationship between the normal stress and the she ar stress. Using the interface stress distribution and analogical test results, a method for estimating the joint strength is proposed. In t he numerical calculations, the effect of the outer diameter and Young' s modulus of the rings and the engagement length on the contact stress distributions at the interfaces are clarified. Push-off force measure ment was carried out for bonded shrink fitted joints. In the experimen ts, the effect of shrink fit interference and the outer diameter of ri ng on the joint strength are examined. The numerical results are in a fairly good agreement with the experimental results. It is found that the strength of the bonded shrink fitted joint is greater than that of shrink fitted joint.