Pitting is one of the causes of failure for mechanical components subjected to rolling contact fatigue. In the present article, a FE model is described in which a 20 half-space with an edge crack is affected by a travelling contact load produced by a cylindrical body. The contact load is not approximated by an analytical pressure distribution but the actual mating bodies are modelled. The presence of lubricant between the mating bodies and inside the crack is taken into account and its effect on the crack is simulated via hydrostatic elements. The lubricant is assumed to be entrapped into the crack by the external body when the latter covers the crack mouth, that is, the crack is sealed by the contact area and not by the contact between the crack faces (fluid entrapment mechanism). The pressure of the fluid is calculated via an iterative procedure by assuming that its volume stays constant inside the crack. Comparisons between this model and the alternative fluid pressurization mechanism have been made. The effects of the coplanar extension are investigated. The outcomes suggest that the fluid pressures inside the crack produced by the fluid entrapment mechanism tend to those of the fluid pressurization mechanisms as the crack becomes short.

The role of the second body on the pressurization and entrapment of oil in cracks produced under lubricated rolling-sliding contact fatigue / Ancellotti, Simone; Benedetti, Matteo; Dallago, Michele; Fontanari, Vigilio. - In: THEORETICAL AND APPLIED FRACTURE MECHANICS. - ISSN 0167-8442. - STAMPA. - 2017:91c(2017), pp. 3-16. [10.1016/j.tafmec.2017.02.007]

The role of the second body on the pressurization and entrapment of oil in cracks produced under lubricated rolling-sliding contact fatigue

Ancellotti, Simone;Benedetti, Matteo;Dallago, Michele;Fontanari, Vigilio
2017-01-01

Abstract

Pitting is one of the causes of failure for mechanical components subjected to rolling contact fatigue. In the present article, a FE model is described in which a 20 half-space with an edge crack is affected by a travelling contact load produced by a cylindrical body. The contact load is not approximated by an analytical pressure distribution but the actual mating bodies are modelled. The presence of lubricant between the mating bodies and inside the crack is taken into account and its effect on the crack is simulated via hydrostatic elements. The lubricant is assumed to be entrapped into the crack by the external body when the latter covers the crack mouth, that is, the crack is sealed by the contact area and not by the contact between the crack faces (fluid entrapment mechanism). The pressure of the fluid is calculated via an iterative procedure by assuming that its volume stays constant inside the crack. Comparisons between this model and the alternative fluid pressurization mechanism have been made. The effects of the coplanar extension are investigated. The outcomes suggest that the fluid pressures inside the crack produced by the fluid entrapment mechanism tend to those of the fluid pressurization mechanisms as the crack becomes short.
2017
91c
Ancellotti, Simone; Benedetti, Matteo; Dallago, Michele; Fontanari, Vigilio
The role of the second body on the pressurization and entrapment of oil in cracks produced under lubricated rolling-sliding contact fatigue / Ancellotti, Simone; Benedetti, Matteo; Dallago, Michele; Fontanari, Vigilio. - In: THEORETICAL AND APPLIED FRACTURE MECHANICS. - ISSN 0167-8442. - STAMPA. - 2017:91c(2017), pp. 3-16. [10.1016/j.tafmec.2017.02.007]
File in questo prodotto:
File Dimensione Formato  
TAFMEC2017.pdf

Solo gestori archivio

Tipologia: Versione editoriale (Publisher’s layout)
Licenza: Tutti i diritti riservati (All rights reserved)
Dimensione 4.79 MB
Formato Adobe PDF
4.79 MB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11572/185362
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 10
  • ???jsp.display-item.citation.isi??? 8
  • OpenAlex ND
social impact