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Grundlagen für die Dimensionierung von schrumpfgeklebten Welle-Nabe-Verbindungen
: Fraunhofer-Institut für Betriebsfestigkeit -LBF-, Darmstadt
Combining shrunk fit with adhesive bond in shaft hub joints significantly increases strength and fatigue strength. After investigations of adhesively bonded shrunk shaft hub joints under torsion and combined statical torsion and rotating bending during the last years, now the resistance under altering torsion and rotating bending is examined. Different from former tests which generally showed failure of the adhesive layer, present tests dominantly result fretting fatigue failures. The high cycle strength is significantly decreased and failure of the shaft mainly occurs. Based on experimental results a normalized 3-D-fatigue diagram is developed. Parameters of normalizing are the torsional strength and the endurance limits of alternating torsion and rotating bending. These parameters represent the various influences on the strength of the joint. The normalized fatigue diagramm is the base of a design method called "Bezugsspannungsmethode".