DETERMINATION OF FATIGUE CHARACTERISTICS OF A TYPICAL NOSE LANDING GEAR,
Abstract
Twenty identical, unused nose landing gears were tested to determine the structural fatigue characteristics of these structures. Twelve specimens were tested under constant-amplitude loading and eight under spectrum loading. The constant-amplitude tests were cycled between a lower load level of zero and various upper load levels including a maximum value of 140 percent limit load. The spectrum tests were performed for three different spectra. For each spectrum the load was cycled from a lower load level of zero to the various upper load levels associated with each spectrum. Preliminary results from this and other investigations indicate that use of the Miner-Palmgren hypothesis results in conservative estimates of life compared to actual values obtained from spectrum tests at R>0 and results in unconservative estimates when compared to actual values obtained from spectrum tests at R<0. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 21, 1964
- Accession Number
- AD0609907
Entities
People
- M. S. Rosenfeld
- R. J. Zoudlik