Accession Number:

ADA109388

Title:

The Role of Environment on Time Dependent Crack Growth

Descriptive Note:

Technical rept.

Corporate Author:

RENSSELAER POLYTECHNIC INST TROY NY DEPT OF MATERIALS ENGINEERING

Personal Author(s):

Report Date:

1981-12-01

Pagination or Media Count:

22.0

Abstract:

Gaseous as well as aqueous environments are known to accelerate time dependent crack growth under either static loading SCC or HE or dynamic loading conditions. In some cases, the rate controlling processes of these phenomena have been related to surface controlled reactions, while in other cases bulk reactions such as diffusion appear to be rate limiting. It is not entirely clear that the mechanisms of time dependent crack growth are identical for different environmentalloy couples, or for different ranges of loading conditions. This paper will attempt to examine the chemical aspects of environmentalloy interactions and to correlate those aspects with observed crack propagation rates under a variety of loading conditions at or near room temperature. Additionally, a brief discussion of the role of environment on elevated temperature fatigue crack growth will be presented. Author

Subject Categories:

  • Properties of Metals and Alloys
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE