Mechanical properties of hub/shaft joints adhesively bonded and cured under hydrostatic pressure

Adhesively bonded hub/shaft joints show better mechanical properties when hydrostatic pressure by using press fits is applied on the adhesive layer. This paper presents a newly developed adhesively bonded hub/shaft joint that allows to cure the adhesive at defined high hydrostatic pressure. After injection into a cavity of defined width between hub and shaft hydrostatic pressure of up to 120 MPa is built up on the adhesive during the curing process. Shear strengths of the adhesive is determined after curing by quasi-statical tension and torsion of the joints as well as by fatigue tests for two different types of adhesives and two combinations of adherent materials. It was found that hydrostatic pressure on the adhesive during the curing process increases the strength of the joint significantly compared to curing under atmospheric pressure.