Alloy Needs and Design: The Airframe
Materials applications in aircraft are discussed, and design requirements for strength and fatigue resistance are examined to afford an insight as to the problems of selecting materials for structural applications. Examples of materials selection and application are discussed for a new generation/wide-body aircraft. The concepts of fail-safe and damagetolerant structures are reviewed.
Alloy needs for future aircraft are expected to continue to depend on aluminum, steel, and titanium for the principal components. However, in aluminum, new developments in alloy design are needed that achieve superior fatigue and strength properties combined with immunity to stress-corrosion cracking. Aluminum alloys with enhanced high-temperature strength and stability are also needed. In titanium, future alloys should have improved fabrication characteristics lo achieve lower cost structure and better metallurgical controls to provide more reliable fatigue and toughness properties. Future steel-alloy developments must provide more damage tolerant and more stress-corrosion resistant grades without compromising strength properties or fabrication characteristics.
KeywordsAluminum Alloy Fracture Toughness Titanium Alloy Fatigue Life Corrosion Fatigue
Unable to display preview. Download preview PDF.
- 1.Evancho, J. W., NADC Contract No. N62269-74-C-0438, Alcoa Technical Center (1975).Google Scholar
- 2.Cina, B., U.S. Patent 3,856,584 (December, 1974).Google Scholar
- 3.Otto, W. L., AFML Contract F-33615-74-C-5077, Alcoa Laboratories (April, 1975).Google Scholar
- 4.Grant, N. J., and R. M. Pelloux, Liquid-Metal Atomization for Hot Working Preforms ,Metals and Ceramics Information Center (October, 1972).Google Scholar
- 5.Grant, N. J., paper presented at Third NORDIC High Temperature Symposium, M.I.T. Center for Materials Science and Engineering (1972).Google Scholar
- 6.Kaneko, R. S., and Simenz, R. F., paper presented at ASTM 78th Annual Meeting, Symposium on New Approaches to Stress Corrosion (June, 1975).Google Scholar
- 7.Grover, H., Mechanical and Metallurgical Causes of Failure ,Source Book in Failure Analysis, ASTM (October, 1974).Google Scholar
- 8.Steinberg, M. A., Materials of the Future-Metals ,Centennial Volume, AIME, New York (1971).Google Scholar