IX International Conference on Computational Methods for Coupled Problems in Science and Engineering COUPLED PROBLEMS 2021 E. O˜ nate, M. Papadrakakis and B. Schrefler (Eds) EFFECT OF FRETTING-WEAR ON DYNAMIC ANALYSIS. COMPARISON BETWEEN EXPERIMENTAL RESULTS AND NUMERICAL SIMULATIONS FOR A VIBRATORY FRICTION RIG. F. TUBITA * , A. FANTETTI † , L. BLANC * and F.THOUVEREZ * * ´ Ecole Centrale de Lyon, CNRS UMR 5513 LTDS, F-69134 Ecully Cedex, France e-mail: fabia.tubita@ec-lyon.fr, web page: https://www.ec-lyon.fr/ † Imperial College London, Exhibition Rd, London, UK Key words: Non-linear Forced Response, Friction Contact, Fretting-Wear, Multi-scale Problems Abstract. Dry friction in contact interfaces can have an important impact on the dynamic response of jointed structures subjected to vibration. It may cause fretting- wear leading to a modification of the contact surface geometry by producing wear debris through material removal and dissipating energy. Consequently, the contact behaviour is modified and the worn geometry induces a change in vibrations level. Therefore, it is important to be able to simulate these complex phenomena occurring at the interfaces to predict the forced response of assembled structures and also their life-expectancy to design high confidence components. A multi-scale approach is implemented considering a slow-scale for wear phenomena and a fast-scale for the non-linear dynamic response and applied to validate an experimental test. 1 INTRODUCTION Fretting-wear appears between two contacting surfaces, subjected to oscillatory rela- tive movement of small amplitude. The evolution of wear occurs over a long period, on a micro-scale level, but may impact the dynamic response of assembled structures. Con- tact surfaces between root-blade and slot-disk, friction dampers under platform, blade dovetail or fir-tree slots on assembled rotors, shroud contacts and bolted flange joints are the typical industrial applications in which fretting occurs. The importance to pre- dict the vibration response of mechanical assemblies in the presence of this phenomenon is relevant to estimate the performance as well as the lifetime of every component, un- der performance, in terms of damping and also when resonant frequencies change with 1