Acoustic Emission Monitoring of Fatigue Crack Growth in HSLA-80 Steel Box Beams

by Stephen Pessiki, (A.M.ASCE), Lehigh Univ, Bethlehem, United States,
Steven Derrah, Lehigh Univ, Bethlehem, United States,



Document Type: Proceeding Paper

Part of: Structures Congress XII

Abstract:

An acoustic emission is a transient elastic wave generated by the rapid release of energy from a localized source within a material. There can be many sources of acoustic emission in a material or structure subjected to load. Of particular interest in this study are acoustic emissions from fatigue cracking. Acoustic emission (AE) monitoring was performed on four large-scale box beam specimens made of HSLA-80 steel subjected to cyclic loading. Two beams were tested under constant amplitude loading and two beams were tested under variable amplitude loading. A hit-based AE monitoring system recorded the key time domain characteristics of the acoustic emission waveforms during each test. Post-test analysis of the waveform data revealed the existence and location of the fatigue cracks.

Subject Headings: Steel beams | Box beams | Acoustics | Emissions | Cracking | Load tests | Fatigue tests

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