STP505: Use of Acoustic Emission for the Detection of Weld and Stress Corrosion Cracking

    Hartbower, CE
    Associate scientist, senior engineer, liason engineer, and engineering supervisor, Metallurgy Section, Aerojet Solid Propulsion Company, Sacramento, Calif.

    Reuter, WG
    Associate scientist, senior engineer, liason engineer, and engineering supervisor, Metallurgy Section, Aerojet Solid Propulsion Company, Sacramento, Calif.

    Morais, CF
    Associate scientist, senior engineer, liason engineer, and engineering supervisor, Metallurgy Section, Aerojet Solid Propulsion Company, Sacramento, Calif.

    Crimmins, PP
    Associate scientist, senior engineer, liason engineer, and engineering supervisor, Metallurgy Section, Aerojet Solid Propulsion Company, Sacramento, Calif.

    Pages: 35    Published: Jan 1972


    Abstract

    This paper describes the utility of acoustic emission for the detection of weld and stress corrosion cracking. It includes a brief review of the history of acoustic emission, a selected bibliography, and the findings of two researches. It was found that a 100-ksi yield strength constructional alloy weldment produced bursts of acoustic emission for over 400 h after welding. This acoustic emission was correlated with the amount of cracking as determined by metallographic examination. With acoustic emission instrumentation, a convervative threshhold stress intensity for stress corrosion cracking was determined, based on crack propagation rather than on time to failure. A linear relationship is shown between acoustic emission count and stress intensity factor.

    Keywords:

    acoustics, emission, stress waves, stress corrosion cracking, crack propagation, fractures (material), weld defects, cracking (fracturing), nondestructive tests, acoustic detection


    Paper ID: STP35389S

    Committee/Subcommittee: E07.04

    DOI: 10.1520/STP35389S


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