Institute I: General Materials Properties
Ultrasonic fatigue setup
theme: mechanical testing
The Ultrafast MC1 ultrasonic fatigue machine offers unprecedented opportunities to test samples in the ultrahigh cycle fatigue regime within a reasonable lapse of time. The experimental setup was devised at the University of Kaiserslautern and is based on the excitation of a sample to its resonant frequency by a piezo-actuator. The system is equipped with a 500 kHz data measurement card, which allows in combination with a laser interferometric measurement system a very precise determination of displacement amplitude and number of fatigue cycles. The setup is typically operated in a pulse/ pause mode to prevent unwanted specimen heating and so effective frequencies from 2.5 to 10 kHz can be reached. Damage evolution can be monitored by frequency, temperature or dissipated energy. Single amplitude and variable amplitude tests can be done with the MC1-System. The setup is heavily used at the Insitute I for investigating the effect of heat treatment, carbon content and microstructure on the very high cycle fatigue behavior of steels.
The Roell Amsler 10HFFS10V setup uses an electrical drive to generate a high frequency mechanical oscillation. This setup can be used to perform tensile, compression and bending experiments at frequencies up to 140 Hz. In order to allow specific investigations, the experiments can be performed under vacuum, under a specified mean stress or a lateral friction force. The setup is intensively used at the Institute I for the high cycle fatigue characterization of a wide range of materials.