Analysis of acoustic emission waveforms from fatigue cracks on a steel bridge hanger

Fatigue cracks on a steel bridge hanger were monitored for acoustic emission in conjunction with strain gage monitoring. Waveforms of emissions were collected and classified using source location, strain magnitude, position on strain cycle and uniqueness of waveforms as the primary criteria. A vast majority of AE from the cracks were found to be due to crack face rubbing and the crushing of corrosion products between the crack faces while limited crack growth emissions were detected. AE was monitored from A588 compact tension specimens under variable amplitude tension-tension fatigue loading, results of which were used to aid in the interpretation of AE data from the hanger. Crack growth AE were detected only on overload cycles mostly above 92% of maximum load while AE due to crack face rubbing occurred throughout the strain cycle.

Name thesis:degree_name

Master of Science

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Engineering Mechanics

Department dc:contributor.department

Engineering Mechanics

Grantor dc:publisher

Virginia Tech

Year dc:date.issued

1995

Author dc:creator

• Sison, Miguel Fernando G.

Statement dc:rights

• In Copyright

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Language dc:language.iso

en

Dc Identifier Other

etd-02132009-172406

OAI identifier oai:identifier

oai:vtechworks.lib.vt.edu:10919/41098