A fretting damage correction factor applicable to the McDiarmid criterion of plain high‐cycle fatigue

Abstract

This paper presents an assessment of the performance of a set of multi‐axial high‐cycle fatigue criteria on the basis of a series of fretting fatigue experiments. We carried out tests on a creep‐resistant chromium steel material used for steam‐turbine blades. The first type of experiment employed the classical cylinder‐on‐flat geometry with flat dog‐bone specimens. The second set of experiments adopted dovetail geometry. Various loads were applied in order to capture a wide range of contact slip amplitudes. A set of eight plain multi‐axial fatigue criteria was applied to the numerically simulated stress response in the contacts during a single load cycle. Methods, which originated in the so‐called theory of critical distances, were used for correcting the results in order to take the stress gradient effect into account. A simple factor based on slip amplitudes is introduced in order to consider the surface damage and is calibrated for the McDiarmid method. This criterion provided the best estimates of the most probable cracking sites.

Lifetime estimation of mechanical assemblies under constant amplitude fretting fatigue loading

“…Fretting fatigue has been recognised as a primary failure mode across a wide range of structural components, such as dovetail joints, [10][11][12][13] bolt and riveted joints, [14][15][16] spline coupling, 13,17 running cables, and overhead conductors. [18][19][20] Therefore, fretting fatigue has attracted the interest of many researchers, and various aspects of this phenomenon have been investigated during the last decades, such as life prediction, influential factors, mechanisms, new fretting test set-ups, and possible palliatives.…”