Numerical study of fatigue damage under random loading using rainflow cycle counting

Purpose The purpose of this scientific work is to simulate the fatigue damage under random loading taking into account the mean stress effect on fatigue lifetime and using the rainflow counting technique to assess the fatigue damage. Design/methodology/approach The study of fatigue under random loading is based on same concepts which as constant loading with addition of damage summation. The damage of materials due a stress cycle depends not only on the alternating stress but also on the mean stress. Findings The cycles counting simulation method allows quantifying the hysteresis loops, even if for small amplitude stresses. Originality/value The cycles are low or medium; the damage occurs most often, the higher values of alternating stresses cause the most failure of materials.

Automated summary

This scientific work aims to simulate fatigue damage under random loading by considering the mean stress effect on fatigue lifetime and using the rainflow counting technique to assess the fatigue damage. The study reveals that fatigue under random loading is based on concepts of constant loading with the addition of damage summation, and the damage of materials due to stress cycles depends on both alternating stress and mean stress. The simulation method for cycles counting allows quantifying hysteresis loops, even for small amplitude stresses.