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) : Wei, Robert P ; Gangloff, Richard P

PDF Url : ADA190137

Report Date : Dec 1987

Pagination or Media Count : 63

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.

Descriptors :   *ALUMINUM ALLOYS, *CORROSION RESISTANT ALLOYS, CORROSION, CRACK PROPAGATION, CRACKS, FATIGUE(MECHANICS), FRACTURE(MECHANICS), HYDROGEN EMBRITTLEMENT, OCEAN ENVIRONMENTS, RELIABILITY, STEEL, STRESS CORROSION, STRUCTURAL PROPERTIES, TITANIUM ALLOYS, STRUCTURAL MECHANICS, KINETICS, HYDROGEN EMBRITTLEMENT, MICROSTRUCTURE

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE