Journal
THEORETICAL AND APPLIED FRACTURE MECHANICS
Volume 91, Issue -, Pages 3-16Publisher
ELSEVIER
DOI: 10.1016/j.tafmec.2017.02.007
Keywords
Fluid entrapment; Fluid pressurization; Inclined edge crack; Rolling contact fatigue; Stress intensity factors
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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. (C) 2017 Elsevier Ltd. All rights reserved.
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