Fretting fatigue strength

The determination of fretting fatigue strength is carried out by means of experimental model investigations on the innovative friction block test rig. Due to the parallel arrangement of the slip actuator to the mechanical tension-compression test axis, independent investigations of the contact pressure as well as the slip on the tribological contact are possible. The described decoupling of the mechanical test axis from the tribological axis represents a unique feature compared to comparable test setups. The fatigue strength investigations can be carried out in the finite life region as well as in the transition region to infinite life, depending on customer requirements.

The geometry of the specimens must be defined in detail according to customer requirements. Both areal and line contacts can be realized by adapting the contact geometry of the friction blocks. The standard specimen geometry is shown below.

The calculation of fretting fatigue strength is not implemented in today's standardized calculation methods such as DIN 743 for shafts and axes and in the FKM Guideline. The experimental determination of fretting fatigue strength therefore remains a proven means of assessing components damaged by fretting corrosion. In this regard, we are happy to help you with the determination of fretting fatigue strength as well as with the evaluation of parameter variations with respect to tribological stress (contact pressure and slip). In addition, material variations and remedial measures to prevent fretting corrosion damage can also be carried out at the test rig of the Institute for Design and Drive Engineering.

• RKP100 - Reibklötzchenprüfstand 100