Fatigue Life Prediction of Key Structural Parts in Aeronautics and Astronautics Based on Fuzzy Theory
For the fuzzy phenomenon during fatigue life prediction of key structural parts in aeronautics and astronautics, membership function is used to denote the fuzziness of fatigue damage caused by the stress nearby fatigue limit. The concept of fuzzy zone of stress is put forward and classified as safety fuzzy zone, economy fuzzy zone and compatibility fuzzy zone according to relative position among fatigue limit and edges of the fuzzy zone of stress. The results of the example show that the accuracy of fatigue life prediction can be largely improved by the method. Choosing safety fuzzy zone and increasing half normal distribution in the example, and setting parameter a=0.6σr,k=0.5 the error can be reduced by 51.0％ compared to the traditional fatigue life prediction method.
fatigue life membership function fuzzy zone of stress fatigue damage fuzzy theory
Wang Xuliang Nie Hong
Nanjing University of Aeronautics and Astronautics,Nanjing,China,210016
国际会议
深圳
英文
625-628
2008-12-10（万方平台首次上网日期，不代表论文的发表时间）