a quite critical comment of a recent set of fretting fatigue experiments

Effect of out-of-phase loading on fretting fatigue response of Al7075-T6 under cyclic normal loading using a new testing apparatu

Article reference: EFM5856
Journal title: Engineering Fracture Mechanics
Corresponding author: Prof. M. Ciavarella
First author: Prof. M. Ciavarella
Online publication complete: 1-FEB-2018
DOI information: 10.1016/j.engfracmech.2018.01.031

Dear Prof. Ciavarella,

We are pleased to inform you that the final corrections to your proofs have been made. Further corrections are no longer possible. Your article is now published online at:

https://doi.org/10.1016/j.engfracmech.2018.01.031

Highlights

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Fretting fatigue has been studied mainly with constant normal load.

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Abbasi and Majzoobi (2017) have in phase or out-of-phase varying normal load at the same frequency.

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Contact mechanics and numerical simulations seem at odd with the findings.

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If experiments are confirmed, varying normal load effect calls for some new models in fretting.

Abstract

Fretting fatigue has been studied mainly with constant normal load. Abbasi and Majzoobi (2017) suggest an new testing method where contact pressure can be independently varied during the test. The authors compare the case of constant normal load, with that of in phase or 90° and 180° degrees out-of-phase loads, but at the same frequency. However, the results are not obvious to interpret, and it is hoped that a reply from the authors and a discussion could lead to some progress. In particular, contact mechanics (and even the authors’ own numerical simulations) seem in contrast with some experiments. Also, the case of constant normal load is found to be the least damaging despite less frictional force is developed which seems to imply an oxidation phenomenon which depends on greater exposure to air, but the time of tests seems similar. If these surprising effects are confirmed, this varying normal load effect calls for some new models in fretting. Or there is something wrong in the experiments?