A Method of Analyzing Probability Distribution of Fatigue Life of Notched Specimen based on Average Stress Model
Volume 6, Number 3, May 2010 - Paper 3 - pp. 223-232
WEI XI and WEI-XING YAOKey Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle, Nanjing University of Aeronautics & Astronautics, Nanjing 210016, China
(Submitted on May 19, 2009. Received from the Guest Editor on August 25, 2009)
A method of analyzing probability distribution of fatigue life of notched specimens is proposed in this paper based on the average stress model for fatigue life calculation. The factors which have effect on the probability distribution of fatigue life of notched specimens were separated into two parts, the non-homogeneity of microstructure and the dispersion of local stress at the notch root. The effect of the former part could be obtained by means of test data of fatigue life of the smooth specimens, and that of the later part was achieved by the Monte Carlo stochastic finite element method (SFEM). Lastly the two portions were combined organically, and thus the probability distribution of fatigue life of notched specimens was got. Examples at two different stress levels were accomplished, and the predicted distribution was in good agreement with the experimental result, which demonstrates that this method is feasible and effective.
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