This contribution investigates the fatigue response of shaft hub couplings joined by interference fit. The authors compared the fatigue response of a plain specimen manufactured according to ISO 1143 and those of a shrink fitted specimen characterized by a rounded bore edge. The decrease in fatigue life observed on the shrink fitted specimen is due to both the steep stress gradient due to the shrink fitting process and the presence of fretting at the mating surfaces. Therefore, the decrease of the fatigue life for given load level cannot be predicted by means of FEA alone, since it is partly due to fretting. The present paper reports observations of both survived and failed specimens performed by means of multifocus and SEM microscopes. Such tests led to a better understanding of the tribological characteristics of the joint. For instance, the amplitude of the experimentally observed sliding path is compared with that given by FEA models for different friction coefficient values.

THE EFFECT OF FRETTING ON THE FATIGUE RESPONSE OF INTERFERENCE FITTED CYILINDRICAL JOINTS

CROCCOLO, DARIO;DE AGOSTINIS, MASSIMILIANO;FINI, STEFANO;MORRI, ALESSANDRO;OLMI, GIORGIO
2014

Abstract

This contribution investigates the fatigue response of shaft hub couplings joined by interference fit. The authors compared the fatigue response of a plain specimen manufactured according to ISO 1143 and those of a shrink fitted specimen characterized by a rounded bore edge. The decrease in fatigue life observed on the shrink fitted specimen is due to both the steep stress gradient due to the shrink fitting process and the presence of fretting at the mating surfaces. Therefore, the decrease of the fatigue life for given load level cannot be predicted by means of FEA alone, since it is partly due to fretting. The present paper reports observations of both survived and failed specimens performed by means of multifocus and SEM microscopes. Such tests led to a better understanding of the tribological characteristics of the joint. For instance, the amplitude of the experimentally observed sliding path is compared with that given by FEA models for different friction coefficient values.
2014
Atti del 43° Convegno Nazionale dell’Associazione Italiana per l’Analisi delle Sollecitazioni
1
11
D. Croccolo; M. De Agostinis; S. Fini; A. Morri; G. Olmi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/408806
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