Fatigue Crack Growth in AerMet 100 Steel
Abstract
The fatigue behavior of a newly developed landing gear steel, AerMet 100, was studied. In this study, the fatigue tests were performed under constant amplitude loading for stress ratios R = 0.1, 0.5, and 0.8 In dry nitrogen gas and a 3.5% NaCl solution at room temperature. The fatigue crack growth resistance of the AerMet 100 steel Is superior to that of the 300M steel, which has been widely used for aircraft landing gears. Within the employed range of stress ratios, the greater the stress ratio, the smaller is the threshold stress intensity range for fatigue crack growth Kth and the greater is the fatigue crack growth rate da/dN for lower K. For higher K, however, the da/dN values of different stress ratios are similar in both environments. The K is greater and da/dN is smaller for lower K in a 3.5% NaCl solution than in dry nitrogen gas, whereas the da/dN values are quite close for higher K in both environments. This feature is attributable to corrosion-product-induced crack closure. Fatigue behavior, Landing gear steel, AerMet 100, Constant amplitude loading, Stress ratio, Crack growth.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 18, 1991
- Accession Number
- ADA249068
Entities
People
- Eun U. Lee
Organizations
- Naval Air Warfare Center Warminster