Accession Number:

ADA190137

Title:

Environmentally Assisted Crack Growth in Structural Alloys: Perspectives and New Directions.

Descriptive Note:

Technical rept. 1 Jan-31 Dec 87,

Corporate Author:

LEHIGH UNIV BETHLEHEM PA INST OF FRACTURE AND SOLID MECHANICS

Personal Author(s):

Report Date:

1987-12-01

Pagination or Media Count:

63.0

Abstract:

Environmentally assisted crack growth namely, stress corrosion cracking and corrosion fatigue in alloys is one of the principal determining factors for durability and reliability of engineering structures. Over the past 20 years, activities in this area have transformed from principally that of screening and qualitative characterizations of the phenomena, to that of quantitative assessment and scientific understanding. This work has enabled the recent development of life prediction procedures. In this paper, the contributions of fracture mechanics in this transformation are reviewed. Current mechanistic understanding and environmentally assisted crack growth by hydrogen embrittlement is summarized, and is placed in perspective. Applications to mitigate stress corrosion and corrosion fatigue cracking in marine environments are summarized. Some outstanding issues and new directions for research are discussed. Keywords Crack propagation, aluminum alloys titanium alloys steels corrosion fatigue fracture mechanics.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE