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Fatigue Life Assessment of 30CrNiMo8HH Steel Under VAL
The nickel-chromium-molybdenum 30CrNiMo8HH steel alloy provides excellent tensile and yield strength along with high hardness, stiffness and fatigue resistance. Therefore, it is widely used in many engineering components such as power trains, chemical plants, drive shafts, air craft structures and turbine blades. Engineering structures are mostly subject to variable amplitude loading (VAL). This variable nature of loads can be generated from external conditions such as wind gusts, road roughness and see waves. Nevertheless, most fatigue characterization experiments are done under CAL. In order to use the fatigue parameters obtained from CAL to predicted fatigue life under VAL, several considerations have to be taken into account. Mean load effect, load sequence effect and a proper cycle counting method are the major factors to account for when predicting the fatigue life of a component subject to VAL.