1. SEG‐CEMMPRE, Department of Mechanical Engineering University of Coimbra Coimbra Portugal
2. Department of Mechanical Engineering School of Engineering, University of Minho Guimarães Portugal
3. SEG‐CEMMPRE, Department of Mechanical Engineering IPN ‐ LED & MAT ‐ Instituto Pedro Nunes, Laboratory for Wear, Testing and Materials Coimbra Portugal