Predicting the Analysis of Fretting Damage for Addis Ababa Light Rail Train Wheel Set
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Date
2014-10
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Addis Ababa University
Abstract
Fretting in railway transportation results usually on the contact areas (fitting zones) of wheels
and axles due to repeated relative oscillatory movement of small amplitude which leads to the
formulation of cracks. The wheel seat of the axle is the weak zone for fatigue with the impact
of fretting; hence to minimize this, this research deals on the analysis of fretting damages on
rail vehicle axles and wheels (wheel set) with respect to the Addis Ababa light train (LRT).
The main objective of this research deals with the evaluation of fretting fatigue life of wheel
set by using CATIA software for the modelling purpose and finite element analysis (FEA)
ANSYS workbench for fatigue life and damage analysis. The results are computed by
varying the main causes of fretting that is the influence of the coefficient of friction, slip
amplitude, and frequency is observed. Calculation of The main causes for the formation of
fretting such as bending stress, tangential force and frequency is done. Based on these results
fretting fatigue life of wheel set is observed to decrease at friction coefficients ranging from
0.1 to 0.3.in addition to this it is observed that the fretting life of the axle and wheel assembly
decreases with an increase of frequency and slip amplitude ranging from 8.84 Hz up to
200Hz and 5 μm up to 25μm respectively. Finally fretting damage is observed to increase
with an increment of coefficient of friction, slip amplitude and frequency by the analysis
made mathematically and using ANSYS software; hence this thesis would be applicable and
will contribute detail information in our country railway system by reducing failures that
arise due to fretting.
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Keywords
Fretting Damage, Addis Ababa Light Rail Train Wheel Set, Predicting, Analysis