PSI - Issue 57

Luc AMAR et al. / Procedia Structural Integrity 57 (2024) 217–227 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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1. Introduction Fretting corrosion is a failure which happens when surfaces in contact oscillate with micro-displacement (Waterhouse, 1981). These micro slips generate a local wear of surfaces and some of the debrits are captured inside the contact oscillating area (Mezlini, Elleuch and Kapsa, 2006). In the case of steel-to-steel contact, particles can oxidize to a hard debrit and thus increase the damage (Vincent et al. , 1984; Berthier, Vincent and Godet, 1989). According to the normal load, the slip amplitude to contact length ratio, and other parameters, a fretting map can be drawn (Vingsbo and Söderberg, 1988), and two main failure typologies appears, fretting fatigue on partial slip regime and fretting wear on gross slip regime (Fouvry, Elleuch and Simeon, 2002) (see Figure 1). More recently, it was proposed to link the fretting wear to the dissipated energy (Fouvry, Kapsa and Vincent, 2001) unlike to the wear length according to a widespread Archard law (Archard, 1953). The mechanical industry is encountering fretting wear (or fretting corrosion) failures on mechanical transmission components such as spline joints (Medina, 2002; Ding et al. , 2008; Cuffaro and Mura, 2013; Amar, 2018), shrink fit gears (Truman and Booker, 2007) and bearing rings , or steady state gears and rolling bearings (also called false brinelling) (Errichello, 2004; Kotzalas and Doll, 2010). It needs tribological data on the potential technological means available preventing this wear, particularly in terms of material, heat treatment and surface treatments selection. In the article from Fu et al. qualitative classification of surface modification method was proposed (Fu, Wei and Batchelor, 2000) and enhanced by a review from Cetim (Amar and Shandro, 2017) (See Table 1). The French board of mechanical transmission and rolling bearing asked the Ceitm to perform test in order compare the material, surface and heat treatment used by these industries against fretting wear, especially concerning spline joint and shrink fit (rolling bearing outer ring). These data, such as the coefficient for example, will help them not only to improve the service life of existing machines, but above all to optimize the rating of new machines with new materials, heat treatments and lubricants under new environmental constraints.

Fig. 1. Evolution of damage as a function of the stabilized sliding condition according to Fouvry et al. (Fouvry, Elleuch and Simeon, 2002)