Issue 37

I.Llavori et alii, Frattura ed Integrità Strutturale, 37 (2016) 87-93; DOI: 10.3221/IGF-ESIS.37.12 87 Focussed on Multiaxial Fatigue and Fracture An all-in-one numerical methodology for fretting wear and fatigue life assessment I. Llavori Departamento de Mecánica y Producción Industrial, Escuela Politécnica Superior de Mondragon Unibertsitatea, Loramendi 4, 20500, Arrasate-Mondragon, Spain, illavori@mondragon.edu M.A. Urchegui Orona EIC, Orona Ideo, Jauregi bidea s/n, 20120, Hernani, Spain, maurchegui@orona-group.com W. Tato, X. Gomez Departamento de Mecánica y Producción Industrial, Escuela Politécnica Superior de Mondragon Unibertsitatea, Loramendi 4, 20500, Arrasate-Mondragon, Spain, wtato@mondragon.edu, xgomez@mondragon.edu A BSTRACT . Many mechanical components such as, bearing housings, flexible couplings and spines or orthopedic devices are simultaneously subjected to a fretting wear and fatigue damage. For this reason, the combined study on a single model of wear, crack initiation and propagation is of great interest. This paper presents an all-in-one 2D cylinder on flat numerical model for life assessment on coupled fretting wear and fatigue phenomena. In the literature, two stages are usually distinguished: crack nucleation and its subsequent growth. The method combines the Archard wear model, a critical-plane implementation of the Smith-Watson- Topper (SWT) multiaxial fatigue criterion coupled with the Miner-Palmgren accumulation damage rule for crack initiation prediction. Then, the Linear Elastic Fracture Mechanics (LEFM) via eXtended Finite Element Method (X-FEM) embedded into the commercial finite element code Abaqus FEA has been employed to determine the crack propagation stage. Therefore, the sum of the two stages gives a total life prediction. Finally, the numerical model was validated with experimental data reported in the literature and a good agreement was obtained. K EYWORDS . Fretting; Multiaxial Fatigue; Wear; Crack Propagation; X-FEM. I NTRODUCTION any mechanical components such as, bearing housings, flexible couplings and spines or orthopedic devices are simultaneously subjected to a fretting wear and fatigue damage. Fretting phenomenon arises when two bodies are in contact subjected to relative movement of small amplitude, producing damage to the contact surface [1]. Depending on the magnitude of stresses, fretting phenomenon can cause catastrophic failure of such mechanical components. M

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