Fretting Fatigue Strength And Life Estimation
Considering The Fretting Wear Process
Author(s)
T. Hattori, M. Yamashita & N. Nishimura
Abstract
In this paper we present the estimation methods of fretting wear process and
fretting fatigue life using this wear process. Firstly the fretting-wear process was
estimated using contact pressure and relative slippage. And then the stress
intensity factor for cracking due to fretting fatigue was calculated by using
contact pressure and frictional stress distributions, which were analyzed by the
finite element method. The S-N curves of fretting fatigue were predicted by
using the relationship between the calculated stress intensity factor range (∆K)
with the threshold stress intensity factor range (∆Kth) and the crack propagation
rate (da/dN) obtained using CT specimens of the material. Finally fretting fatigue
tests were conducted on Ni-Cr-Mo-V steel specimens. The S-N curves of our
experimental results were in good agreement with the analytical results obtained
by considering fretting wear process. Using these estimation methods we can
explain many fretting troubles in industrial fields.
Key words: fretting fatigue, fretting wear, contact pressure, fracture mechanics,
threshold stress intensity factor range, crack propagation rate, crack initiation,
stress singularity parameters.
1 Introduction
Fretting can occur when a pair of structural elements are in contact under a
normal load while cyclic stress and relative displacement are forced along the
contact surface. This condition can be seen in bolted or riveted joints [1,2], in
the shrink-fitted shafts [3,4], in the blade dovetail region of turbo machinery
[5,6], etc. During fretting the fatigue strength decreases to less than one-third of
that without fretting [7,8]. The strength is reduced because of concentrations of
Keywords
fretting fatigue, fretting wear, contact pressure, fracture mechanics,
threshold stress intensity factor range, crack propagation rate, crack initiation,
stress singularity parameters.
Related Book
Other papers in this volume
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