Reliability Analysis of Corrosion Fatigue Crack Growth for 2024-T3Aluminum Alloy
Fatigue crack growth rate experiments of center-cracked tension (CCT) specimens of the2024-T3 aluminum alloy under constant-amplitude load in corrosive environment are carried out with3 kinds of loading frequency.The fatigue crack growth rates in 3.5％ NaCl solution are obtained byusing seven-point incremental polynomial method.A probabilistic approach is presented for fatiguecrack growth rate in corrosive environment with log-normal random variable model.The reliabilityanalysis of crack propagation is conducted based on the experimental data.The crack exceedanceprobability at given service time and the distribution of the service time at given crack size areobtained by using the reliability analysis approach.The effect of loading frequency on crackpropagation is studied.It is shown that the fatigue crack growth rate is increasing with loadingfrequency decreasing in corrosive environment.The predicted results by the presented method matchthe experimental results very well.
corrosion fatigue crack growth crack exceedance probability reliability analysis
S.Ge Z.Li J.G.Zhang Y.C.Xiao G.Q.Liu B.S.Bao
Aircraft Strength Research Institute of China,PO Box 86 Xian 710065,China
国际会议
成都
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）