Numerical modelling of micro-pitting of gear teeth flanks

Gorazd Fajdiga (Author), Jože Flašker (Author), Srečko Glodež (Author), Trevor K. Hellen (Author)

Abstract

A two-dimensional computational model for simulation of contact fatigue of gear teeth flanks is presented. In the model, it is assumed that the initial crack of length 0.015 mm is initiated at the surface due to previous mechanical or heat treatment of the material as well as a consequence of the running in process. The discretized model with the initial crack is then subjected to normal contact pressure, which takes into account the elasto-hydro-dynamic (EHD) lubrication conditions, and tangential loading due to friction between contacting surfaces. The model also considers the moving contact of gear flanks, fluid trapped in the crack and residual stresses due to heat treatment of the material on crack propagation. The virtual crack extension (VCE) method, implemented in the finite element method, is then usedfor simulating the fatigue crack growth from the initial crack up to the formation of the surface pit. The computational results show that the initial surface crack of length 15 m and the considered boundary conditions lead to the appearance of very small surface pits, which can be termed as micro-pitting on gear teeth flanks. The numerical results correspond well withavailable experimental data.

Keywords

strojni elementi;gonila;lomna mehanika;numerična analiza;mikro jamičenje;simulacija jamičenja;matematični model;utrujanje;kontaktna mehanika;širjenje razpoke;machine elements;gearing;fracture mechanics;numerical analysis;micro pitting;pitting simulation;matematical model;fatigue;contact mechanics;crack propagation;

Data

Language:	English
Year of publishing:	2003
Typology:	1.01 - Original Scientific Article
Organization:	UM FS - Faculty of Mechanical Engineering
UDC:	621.833:539.42:519.61/.64
COBISS:	8462614
ISSN:	8756-758X
Views:	1992
Downloads:	0
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary keywords:	strojni elementi;gonila;lomna mehanika;numerična analiza;mikro jamičenje;simulacija jamičenja;matematični model;utrujanje;kontaktna mehanika;širjenje razpoke;
URN:	URN:SI:UM:
Pages:	str. 1135-1143
Volume:	ǂVol. ǂ26
Issue:	ǂiss. ǂ12
Chronology:	Dec. 2003
ID:	8718884