Effect of pitting corrosion on fatigue life

被引：123

作者：

Dolley, E.J. ^{[1
]}

Lee, B. ^{[1
]}

Wei, R.P. ^{[1
]}

机构：

[1] Lehigh University, Dept. of Mech. Eng. and Mechanics, 19 Memorial Drive West, Bethlehem, PA 18015-3085, United States

来源：

Fatigue and Fracture of Engineering Materials and Structures | 2000年 / 23卷 / 07期

关键词：

Correlation methods - Crack propagation - Fatigue of materials - Fatigue testing - Fracture mechanics - Nucleation - Pitting - Probability - Scanning electron microscopy - Sodium chloride;

D O I：

10.1046/j.1460-2695.2000.00323.x

中图分类号：

学科分类号：

摘要：

Fatigue testing of pre-pitted 2024-T3 aluminum alloy specimens is performed in laboratory air at 22 °C and 40% RH to characterize the effect of pitting corrosion on fatigue life. Specimens, pre-corroded in a 0.5 M NaCl solution from 48 to 384 h, have fatigue lives that are reduced by more than one order of magnitude after 384 h precorrosion as compared to those of uncorroded specimens. The reduction in fatigue life is interpreted in terms of the influence of the time of exposure to the corrosive environment or pit size. The crack-nucleating pit sizes, ranging from 20 to 70 μm, are determined from post-fracture examinations by scanning electron microscopy. Fatigue lives are estimated using a fracture mechanics approach and are shown to be in good agreement with the actual data. A probabilistic analysis shows that the distribution of fatigue life is strongly correlated to the distribution in nucleating pit size.

引用

页码：555 / 560