00602668

Component

http://onlinepubs.trb.org...trr/1990/1268/1268-017.pdf

https://scholar.google.co...poor&publication_year=1990

The acoustic emission (AE) technique was used to locate fatigue crack initiation sites and to characterize signals related to fatigue cracks in bridge structural components. An experimental study that included a series of tests on welded and rolled beams was performed. Time and frequency domain analyses were performed on AE signals obtained during various life stages of each specimen. The effect on the AE signals of welding, which changed the material's microstructure, was studied. Two stress ranges and their effect on the AE signals were investigated. An in-service bridge was tested to study its general AE response. AE signals from growing fatigue cracks had distinct characteristcs in both the time and frequency domains. Growing fatigue cracks were detected at relatively early stages of the fatigue lives and the corresponding AE signals were characterized throughout the experiments.

This paper appears in Transportation Research Record No. 1268, Highway Maintenance Operations and Research 1990. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01410869

p. 148-155

1990

Transportation Research Record

0309050235

Figures (9) ; Photos (2) ; References (13) ; Tables (5)

Acoustic emission tests; Cracking; Fatigue cracking; Metal bridges; Microstructure; Monitoring; Steel bridges; Stress ratio; Welding

Stress range

Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls

TRIS, TRB, ATRI

Dec 31 1990 12:00AM

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