Gorazd Fajdiga (Author), Srečko Glodež (Author), Janez Kramar (Author)

Abstract

A computational model for simulation of surface and subsurface initiated fatigue crack growth due to contact loading is presented. The model is based on fracture mechanics theory where the required materials properties are obtained from common fatigue tests. For computational simulations an equivalent model of two contacting cylinders is used instead of simulating theactual contact of mechanical elements. The discretised model with the initial crack on or under the surface is then subjected to normal contact pressure, which takes into account the EHD-lubrication conditions, and tangential loading due to friction between contacting surfaces. The model considers also the moving contact of mechanical elements and for the surface initiated crack also the fluid trapped in the crack. The virtual crack extension method, implemented in the finite element method is then used for simulating the fatigue crack growth from the initial crack up to the formationof the surface pit. The numerical results correspond well with available experimental data. The described model can be used for simulation ofpitting phenomenon of contacting mechanical elements like gears, bearings, wheels, etc.

Keywords

lomna mehanika;strojni elementi;zobniki;kontaktno utrujanje;jamičenje;podpovršinska razpoka;numerična analiza;fracture mechnaics;machine elements;gears;contact fatigue;pitting;subsurface crack initiation;computational analysis;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FS - Faculty of Mechanical Engineering
UDC: 621.833:539.388.1
COBISS: 11227670 Link will open in a new window
ISSN: 0043-1648
Views: 1963
Downloads: 106
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Other data

Secondary language: English
Secondary keywords: lomna mehanika;strojni elementi;zobniki;kontaktno utrujanje;jamičenje;podpovršinska razpoka;numerična analiza;
URN: URN:SI:UM:
Pages: str. 1217-1224
Volume: ǂVol. ǂ262
Issue: ǂiss. ǂ9/10
Chronology: Apr. 2007
ID: 8717341