Accession Number : AD0746122

Title :   Fatigue and Fracture Mechanics.

Descriptive Note : Technical rept.,

Corporate Author : GEORGE WASHINGTON UNIV WASHINGTON D C INST FOR THE STUDY OF FATIGUE FRACTURE AND STRUCTURAL RELIABILITY

Personal Author(s) : Freudenthal,Alfred M.

Report Date : MAY 1972

Pagination or Media Count : 33

Abstract : The application of methods of fracture mechanics to the prediction of fatigue life presupposes the existence of a single flaw of 'critical' size the slow propagation of which, under repeated cyclic loading, represents the relevant damage mechanism that governs 'fatigue' until the flaw has grown to unstable size. The conditions under which this approach to fatigue provides a reasonable model of real behavior are, however, exactly the conditions that should be avoided by adequate fatigue design. Thus the merit of fracture mechanics with respect to fatigue is not in the realistic modeling of the fatigue process in its various aspects, but in the delimitation of the conditions under which this process approaches the model too closely for purposes of design. The paper discusses the different aspects of the fatigue process in relation to the basic concepts of fracture mechanics. (Author)

Descriptors :   (*METALS, *FATIGUE(MECHANICS)), FRACTURE(MECHANICS), CRACKS, CRACK PROPAGATION, MICROSTRUCTURE, STRESSES, DEFECTS(MATERIALS), NUMERICAL ANALYSIS

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE