Lightweight Springs for Limited Life
Published January 1, 1956 by SAE International in United States
Annotation of this paper is available
A SPRING in the Constellation (749) main landing-gear drag-strut damper was redesigned to save 17 lb. The smaller spring required a reduced-size housing, and the overall weight saving per airplane using two such units totaled 55 lb. These springs have served well for over 20,000 hr.
This unusual weight saving was achieved by increasing the working stress more than 50% over conventional design practice. A high working stress was made possible through the use of preset and stresspeen techniques on springs of unusually high quality.
CitationSpaulding, E., "Lightweight Springs for Limited Life," SAE Technical Paper 560041, 1956, https://doi.org/10.4271/560041.
- See Product Engineering, Vol. 21, November, 1950, pp. 117–140: “Fatigue Weakness of Surfaces,” by Almen.J. O.
- See SAE Transactions, Vol. 51, (July) 1943, pp. 248–268: “Shotblasting to Increase Fatigue Resistance,” by Almen.J. O.
- See National Defense Committee of OSRD, War Metallurgy Division, Final Report, Part 1, OSRD No. 3274 (1944), pp. 46–47: “Effect of Shot-peening on the Physical Properties of Steel,” by Mattson R. L. and Almen.J. O.
- See Product Engineering, Vol. 24, July, 1953, pp. 189–191: “Residual Compressive Stress Strengthens Brittle Materials,” by Almen.J. O.
- See National Defense Committee of OSRD, War Metallurgy Division, Final Report, Part 2, OSRD No. 4825, 1945, pp. 108–109: “Effect of Shot-peening on Physical Properties of Steel,” by Mattson R. L. and Almen.J. O.