Accession Number:

AD0604703

Title:

A PROPOSED MECHANISM OF FATIGUE FAILURE,

Descriptive Note:

Corporate Author:

RAND CORP SANTA MONICA CALIF

Personal Author(s):

Report Date:

1955-04-11

Pagination or Media Count:

20.0

Abstract:

Reversed slip is assumed to occur on a single plane, either from the beginning of repeated loading, or after an initial period of slip on different planes. Such slip requires unbonding of the atoms which emerge at the surface of the material. It is assumed that a portion of these atoms do not regain their original bond when the slip is reversed. This results in progressive unbonding along the slip plane. The proposed mechanism is shown to be in agreement with observed facts and is used as a basis for deriving various well-known equations for the sigmaN diagram. The mechanism and equations are used to interpret and explain such phenomena as the endurance limit, effects of mean stress, variable amplitude loading, stress-concentration, elevated temperature, corrosion, and surface treatment. Author

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE