FATIGUE SENSITIVITY AND RELIABILITY OF MECHANICAL SYSTEMS, ESPECIALLY AIRCRAFT STRUCTURES
Abstract
The increasing complexity of structural action and operating conditions of modern aircraft and space structures and the rising demand for reliable estimates of the expected operational life of the designed structure as a function of its anticipated mission, which reflects the realization that such structures must be designed for finite life, puts the designer into the frustrating position of having to chose between the conventional engineering design approach based on safety factors, and the purely statistical reliability approach based on mean time to failure, knowing that neither approach is really applicable in the design of large, fatiguesensitive structures. An attempt was made to develop an integrated design procedure for structures that have to be designed for a combination of ultimate load and fatigue life failure criteria, based on a quantitative measure of fatigue sensitivity. The introduction of this measure permits not only a rational classification of structures in terms of their design fatigue sensitivity, but also their reclassification whenever changes in their operational missions produce significant changes in fatigue sensitivity. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1961
- Accession Number
- AD0268689
Entities
People
- Alfred M. Freudenthal
Organizations
- Ohio State University