1. ARISE, CEMMPRE, Department of Mechanical Engineering, University of Coimbra, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal
2. Leibniz-Institut für Agrartechnik und Bioökonomie e.V. (ATB), Department of System Process Engineering, Max-Eyth-Allee 100, 14469 Potsdam, Germany
3. Laboratory for Wear, Testing and Materials, Instituto Pedro Nunes, Rua Pedro Nunes, 3030-199 Coimbra, Portugal
4. Walker Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA