Research on Simulation of Fatigue Reliability Based on Rainflow Counting Range
In order to evaluate fatigue reliability of single structure under random load, based on rainflow counting range of stress-time history, fatigue strength reliability of structure is obtained by means of stress-strength interference theory and Dirlik’s probability density function of rainflow counting range, as well as by assuming that fatigue limit accords with normal distribution. Also by using Miner’s damage cumulative theory, assuming that fatigue life accords with lognormal distribution, and taking into account dispersion of damage cumulative criterion value, given finite life reliability of structure is obtained by means of Monte-Carlo simulation method. The results show that although maximum range in stress-time history is greater than fatigue limit, when a majority of cycle range in stress-time history is less than fatigue limit, structure has high reliability of fatigue strength. The results of given finite life reliability indicate that although structure has high reliability fatigue strength under single stress-time history, fatigue reliability of structure experiencing many cycles will gradually decrease.
Z.Y. Shen, M.N. James, W.D. Li, and Y.X. Zhao
G. W. Yang and S. N. Xiao, "Research on Simulation of Fatigue Reliability Based on Rainflow Counting Range", Advanced Materials Research, Vols. 44-46, pp. 317-322, 2008