This paper deals with two case studies of failure analysis in sliding/rolling contacts between metallic components. The investigated tribosystems belong to two different fields and involve different contact conditions, but in both of them contact fatigue plays a main role. The first case history comes from earth moving equipment, where the non-conformal contact between a rotating pin and its bearing leads to evidence of large surface damage of the cylindrical pin, with spalling, typical of contact fatigue. However, failure analysis highlighted a dominant role of the first crack nucleation by torsion fatigue. The second case history comes from packaging devices, where the non-conformal contact between a rotating compression roll and the punches for powder pressing led to the formation of macro- and micro-pitting on the surface of both the punches and the roll, indicating that the main damage mechanism is surface-origin contact fatigue.
Chiara BERTUCCIOLI, E.C. (2018). Failure analysis in tribology: two case histories involving contact fatigue of metal components. Torino : Politecnico di Torino.
Failure analysis in tribology: two case histories involving contact fatigue of metal components
BERTUCCIOLI, CHIARA;Lorella CESCHINI;Carla MARTINI;Alessandro MORRI;Andrea MORRI
2018
Abstract
This paper deals with two case studies of failure analysis in sliding/rolling contacts between metallic components. The investigated tribosystems belong to two different fields and involve different contact conditions, but in both of them contact fatigue plays a main role. The first case history comes from earth moving equipment, where the non-conformal contact between a rotating pin and its bearing leads to evidence of large surface damage of the cylindrical pin, with spalling, typical of contact fatigue. However, failure analysis highlighted a dominant role of the first crack nucleation by torsion fatigue. The second case history comes from packaging devices, where the non-conformal contact between a rotating compression roll and the punches for powder pressing led to the formation of macro- and micro-pitting on the surface of both the punches and the roll, indicating that the main damage mechanism is surface-origin contact fatigue.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.