Pawel Pawlus is a Full Professor of Technical Sciences at the Rzeszow University of Technology; Department of Manufacturing Processes and Production Engineering in Poland. His research interests include tribology and technical metrology.Andrzej Dzierwa has a PhD in Technical Sciences and is a researcher at Rzeszow University of Technology, Department of Manufacturing Processes and Production Engineering, Poland. His research interests include tribology and technical metrology. He is a member of Polish Tribological Society; The Society of Tribologists and Lubrication Engineers (STLE) and Hong Kong Society of Mechanical Engineering (HKSME).

• Introduction.- Surface topography and its functional importance.- Fretting.- The effect of frequency and normal load on dry gross fretting of rough surfaces.- Concluding remarks.

Pawel Pawlus is a Full Professor of Technical Sciences at the Rzeszow University of Technology; Department of Manufacturing Processes and Production Engineering in Poland. His research interests include tribology and technical metrology.Andrzej Dzierwa has a PhD in Technical Sciences and is a researcher at Rzeszow University of Technology, Department of Manufacturing Processes and Production Engineering, Poland. His research interests include tribology and technical metrology. He is a member of Polish Tribological Society; The Society of Tribologists and Lubrication Engineers (STLE) and Hong Kong Society of Mechanical Engineering (HKSME).

• Introduction.- Surface topography and its functional importance.- Fretting.- The effect of frequency and normal load on dry gross fretting of rough surfaces.- Concluding remarks.

Pawel Pawlus is a Full Professor of Technical Sciences at the Rzeszow University of Technology; Department of Manufacturing Processes and Production Engineering in Poland. His research interests include tribology and technical metrology.Andrzej Dzierwa has a PhD in Technical Sciences and is a researcher at Rzeszow University of Technology, Department of Manufacturing Processes and Production Engineering, Poland. His research interests include tribology and technical metrology. He is a member of Polish Tribological Society; The Society of Tribologists and Lubrication Engineers (STLE) and Hong Kong Society of Mechanical Engineering (HKSME).

• Introduction.- Surface topography and its functional importance.- Fretting.- The effect of frequency and normal load on dry gross fretting of rough surfaces.- Concluding remarks.