Accession Number:

ADA061447

Title:

Environmental Effects on General Fatigue Resistance and Crack Nucleation in Metals and Alloys.

Descriptive Note:

Technical rept.,

Corporate Author:

RENSSELAER POLYTECHNIC INST TROY N Y DEPT OF MATERIALS ENGINEERING

Personal Author(s):

Report Date:

1978-11-01

Pagination or Media Count:

56.0

Abstract:

The fatigue resistance of metals can be profoundly affected by environmental reactions which affect crack initiation andor propagation. In the case of gaseous environments, oxide films or, in some cases, gas adsorption alone have been related to premature crack initiation for some materials. Crack initiation in other materials does not appear to be affected by gaseous environments, particularly at low temperatures, and there is not good agreement on the criteria which govern these phenomena. In aqueous environments, on the other hand, virtually all corrosive environments affect crack initiation processes, sometimes by a simple phenomenon of pits acting as stress concentrators and, at other times, through what appears to be a far more complex phenomenon. This review details the general phenomena of the effects of environment on fatigue lives and discusses some of the current models which have been proposed to explain environmental effects on fatigue crack initiation. Author

Subject Categories:

  • Properties of Metals and Alloys
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE