摘要：The paper presents the results of low and high frequency fatigue tests carried out on nodular cast iron. The specimens of synthetic nodular cast irons from three different melts were studied in the high cycle fatigue region (from 105to 108cycles) using fatigue experimental equipments for low and high frequency cyclic loading. Low frequency fatigue tests were carried out at frequencyf≈ 120 Hz using the fatigue experimental machine Zwick/Roell Amsler 150HFP 5100. High frequency fatigue tests were carried out at frequencyf≈ 20 kHz using the ultrasonic fatigue testing device KAUP-ZU. Both of them were carried out at sinusoidal cyclic push-pull loading (stress ratioR= -1) at ambient temperature (T≈ 20 °C). The relationshipσa=f(N) and fatigue strengths were determined experimentally; mechanical properties, microstructures and fracture surfaces were investigated.
关键词：ennodular cast ironfatigue testlow frequency fatiguehigh frequency fatiguefatigue fracture
