Wear and rolling contact fatigue of PEEK and PEEK composites |
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| Affiliation: | 1. Department of Mechanical Engineering, University of California, Berkeley, CA, USA;2. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA;3. Cambridge Polymer Group, Boston, MA, USA;4. Department of Materials Science & Engineering, University of California, Berkeley, CA, USA;1. Center for Advanced Vehicular Systems, Mississippi State University, Box 5405, Mississippi State, MS 39762, USA;2. Department for Mechanical Engineering, Mississippi State University, Box 9552, Mississippi State, MS 39762, USA;3. U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS 39180, USA;1. Laboratory for Tribology and Interface Nanotechnology, Faculty of Mechanical Engineering, University of Ljubljana, Bogišičeva, 1000 Ljubljana, Slovenia;2. Department for Nanostructured Materials, Jožef Stefan Institute, Jamova cesta 39, 1000 Ljubljana, Slovenia;1. Department of Mechanical Engineering, Mississippi State University, Box 9552, MS 39762, USA;2. Center for Advanced Vehicular Systems (CAVS), Mississippi State University, Box 5405, MS 39762, USA;3. U.S. Army Engineer Research and Development Center, 3909 Halls Ferry Road, Vicksburg, MS 39180, USA;1. Grupo de Investigación en Tecnologías para la Manufactura (GITEM), Departamento de Energética y Mecánica, km 2 Vía Cali-Jamundí, Universidad Autónoma de Occidente, Cali-Valle, Colombia;2. Department of Mechanical Engineering, 3123 TAMU, University of Texas A&M, College Station, TX 77840, USA |
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| Abstract: | Wear and rolling contact fatigue were investigated on unfilled PEEK and on three PEEK short fiber reinforced composites. For this aim, roller-shaped specimens were subjected to rolling contact tests at different contact pressure levels. Wear rate-pv product and contact pressure-life diagrams were obtained, depending on material hardness. Microscopic observations of rolling contact surfaces and sections of the rollers highlighted damages at two different scales, surface and bulk, leading independently to wear and rolling contact fatigue. These damages were also of different typology for unfilled PEEK and composites: micro-pitting and deep transversal cracks occurred on unfilled PEEK rollers, while delamination and spalling phenomena where found on composite rollers. |
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