FATIGUE LIFE ESTIMATION PROCESSES UNDER CONDITIONS OF IRREGULARLY VARYING LOADS.
Abstract
The fatigue life estimation processes, under the condition of irregularly varying service loads, which are at present employed by designers of structural systems, particulary aircraft, are reviewed and discussed. The characteristics of service load time histories are discussed in general and for several structures in detail. The counting methods for reducing an irregularly varying load time history to a population of cyclic loads are subsequently treated in some detail while the power spectrum method is mentioned for the sake of completeness. The dependence of a load spectrum on the counting method is outlined. An essential part of the report deals with methods of fatigue life estimation, mainly with the linear cumulative damage hypothesis and program testing. The principles of both of these methods and their accuracy are discussed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1967
- Accession Number
- AD0821258
Entities
People
- Gerhard Jacoby
Organizations
- Air Force Research Laboratory