Prediction of corrosion fatigue lives of aluminium alloy on the basis of corrosion pit growth law

被引:99
作者
Ishihara, S [1 ]
Saka, S [1 ]
Nan, ZY [1 ]
Goshima, T [1 ]
Sunada, S [1 ]
机构
[1] Toyama Univ, Dept Mech Engn, Toyama 9308555, Japan
关键词
corrosion fatigue; corrosion pit; stress amplitude; stress frequency;
D O I
10.1111/j.1460-2695.2006.01018.x
中图分类号
TH [机械、仪表工业];
学科分类号
0802 ;
摘要
Tension-compression and rotating-bending fatigue tests were carried out using aluminium alloy 2024-T3, in 3% NaCl solution. The corrosion pit growth characteristics, and also the fatigue crack initiation and propagation behaviour were investigated in detail. The results obtained are summarized as follows: (i) Most of corrosion fatigue life (60-80%) is occupied with a period of corrosion pit growth at low-stress amplitude. The corrosion pit growth law can be expressed as functions of stress amplitude sigma(a) and an elapsed time t. (ii) The critical stress intensity factor for crack initiation from the corrosion pit was determined as 0.25 MPa root m. This value is the same as the threshold stress intensity factor range for crack propagation. (iii) Corrosion fatigue life can be estimated on the basis of corrosion pit growth law and crack propagation law. The estimated fatigue lives agree well with the experimental data.
引用
收藏
页码:472 / 480
页数:9
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