Safety of Construction Components in a Very High Number of Load Cycles

Progressive, high-strength materials have an important position in the transport industry. In this industry, components are subject to high safety and reliability requirements because they often operate under long-term cyclic stress regimes. The paper presents results of fatigue resistance of high-strength materials such DOMEX 700MC, HARDOX 400, HARDOX 450, and INCONEL 718 (UTS from 850 to 1560 MPa) measured at high-frequency cyclic loading (f = 20 kHz, T = 20 ± 5 ° C, push-pull loading, cycle asymmetry parameter of R = -1) in the area from N = 2x10⁶ to N = 2x10⁸ cycles. Fatigue resistance showed a continuous decrease about average value S_{a 2x10}⁸/S_{a 2x10}⁶ = 19.1%.