Accession Number:

AD0736618

Title:

Basic Concepts for Design Against Structural Failure by Fatigue Crack Propagation.

Descriptive Note:

Special summary rept.,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s):

Report Date:

1972-01-13

Pagination or Media Count:

38.0

Abstract:

Structural fatigue has only recently become recognized as a phenomenon of major importance. Fatigue is not confined to individual machinery components, but only within the past two decades has fatigue of entire structures become a factor of importance. This new concept results from advances in high-strength alloy development combined with advances in fabrication technology. These emerging factors have combined to produce massive monolithic structures which are expected to sustain repeated applications of high stresses in service. Traditional concepts of metal fatigue, which are based solely on crack initiation as a failure criterion, are inadequate to deal with modern structural fatigue problems. Cracks readily initiate in large high-strength structures under fatigue loading, and the crucial aspect of the problem is crack propagation. Fatigue design of such structures must rely on safe-life periods between inspections and prevention of catastrophic failure through fracture-safe design considerations. Author

Subject Categories:

  • Structural Engineering and Building Technology
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE