Comparison of Fatigue Properties of Nodular Cast Iron at Low and High Frequency Cyclic Loading

The paper deals with comparison of the fatigue properties of nodular cast iron at low and high frequency fatigue testing. The specimens from three melts of nodular cast iron with different microstructure and mechanical properties were used for experiments. Fatigue tests were carried out at low and high frequency sinusoidal cyclic push-pull loading (stress ratio R = -1) at ambient temperature (T = 20 ± 5 °C). Low frequency fatigue tests were carried out using the fatigue experimental machine Zwick/Roell Amsler 150HFP 5100 at frequency f≈ 120 Hz; high frequency fatigue tests were carried out using the ultrasonic fatigue testing device KAUP-ZU at frequency f≈ 20 kHz.