Wear investigation

Model investigations regarding fretting wear are carried out on the friction block test rig. Unlike fretting fatigue, these investigations are conducted without dynamic loading of the base material. A flat tensile specimen is clamped on one side and the desired slip is set via the block actuators. A special feature of this test rig is the possibility to test not only typical line contacts but also areal contacts. The pressure in the contact can be adjusted via the preload of the friction block holder. The materials of base and counter material as well as coatings can be freely varied. Wear measurements using a confocal microscope are performed on the base material. Furthermore, wear of the friction blocks can be determined using a high-precision balance.

The model specimens shown below (left: base material, right: block or counter material) can be adapted depending on the application.

In addition to the occurring wear, the friction work and the friction coefficient development can be determined over the test duration. By means of the friction work and the wear, important parameters for the design can be determined, such as the wear-critical friction work W_fric,G and the wear coefficient K. In combination with dynamic FE analyses, an estimate can be made regarding the expected service life.

• RKP100 - Reibklötzchenprüfstand 100
• HRP2500 - Hydraulischer Reibwertprüfstand 2500