Accession Number : AD0729088

Title :   Features of Fatigue Mechanisms Clarified by Scanning Electron Microscopy.

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) : MacDonald,D. E. ; Wood,W. A.

Report Date : AUG 1971

Pagination or Media Count : 18

Abstract : It is shown how the scanning electron microscopy can extend earlier observations on the origin and development of (a) plastic fatigue, (b) elastic fatigue, and (c) ultrasonic fatigue in metals. New observations bring out especially a hot spot phenomenon, details of strain concentrations, and exceptions to the two-stage theories of crack propagation. (Author)

Descriptors :   (*FATIGUE(MECHANICS), METALS), (*ELECTRON MICROSCOPY, FATIGUE(MECHANICS)), CRACK PROPAGATION, STRAIN(MECHANICS)

Subject Categories : Test Facilities, Equipment and Methods
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE