Friction Coefficient Determination and Synthesis for Friction-Locked Joints

Growing economic and ecological pressure as well as increased technical requirements lead to higher power densities in force-transmitting/friction-locked components. The frequently used frictional joints (e.g., bolted, flanged, and interference fits) offer considerable potential for increasing power density and wear resistance. Using model-based laboratory tests, IKAT has been researching the static friction coefficient (also: coefficient of friction) under static and dynamic loading for over 10 years. The main research areas include the characterization of friction-locked surfaces, friction-enhancing applications, and remedial measures against vibrational wear (fretting wear).

 

The static friction coefficient (also: coefficient of friction) is to be understood as a system quantity with a multitude of influencing parameters. To exploit existing potential in friction-locked joints, experimental investigation is indispensable. Using standardized test methods on model specimens, a wide variety of tribological configurations are examined at the research facility with regard to their transmission behavior. A main research field is the synthesis of new design/selection tools for friction-enhancing measures (e.g., micro/laser structures, hard particles, coatings) for static and dynamic load cases. Furthermore, remedial measures against fretting wear can be examined and evaluated for their suitability using these test methods.

 

The experimental model investigations are carried out on laboratory test rigs under torsion and transverse-force loading. Full-scale component investigations are performed on the universal rotary cylinder test rig.

Hydraulic Friction Coefficient Test Rig HRP2500        Test fixture for friction-coefficient tests

Hydraulic Rotary Cylinder Test Rig HDZ8000