Consolidated Presentation of Fatigue Data for Design Applications

740277

02/01/1974

Event
1974 Automotive Engineering Congress and Exposition
Authors Abstract
Content
Analytical methods have been developed to consolidate fatigue data for use in design of aerospace metallic structures. Fatigue data from constant-amplitude, uniaxially loaded specimens of 2024 and 7075 aluminum alloys, Ti-6A1-4V alloy, and 300M steel were consolidated and statistically analyzed. An equivalent strain parameter was used to account for the influence of stress ratio on fatigue life. Notched-specimen data were consolidated by using a local cyclic stress-strain approach to account for fatigue damage at the notch root. An arc-hyperbolic tangent function was used to relate the equivalent strain parameter to the common logarithm of fatigue life. After computing mean fatigue curves by least-squares regression, 90 and 99% lower-level tolerance curves were determined for a 95% level of confidence. These curves were constructed to represent a statistically based lower bound on fatigue life for any combination of strain amplitude, maximum stress, and stress-concentration factor within the defined boundaries of the function.
Meta TagsDetails
DOI
https://doi.org/10.4271/740277
Pages
19
Citation
Rice, R., and Jaske, C., "Consolidated Presentation of Fatigue Data for Design Applications," SAE Technical Paper 740277, 1974, https://doi.org/10.4271/740277.
Additional Details
Publisher
Published
Feb 1, 1974
Product Code
740277
Content Type
Technical Paper
Language
English