Acoustic Emission Monitoring of Stressed Composite Bars

by Z. Sami, West Virginia Univ, Morgantown, United States,
H. L. Chen, West Virginia Univ, Morgantown, United States,
H. V. GangaRao, West Virginia Univ, Morgantown, United States,



Document Type: Proceeding Paper

Part of: Structural Engineering in Natural Hazards Mitigation

Abstract:

In this study, Acoustic Emission (AE) technique is used to monitor the behavior of composite bars subjected to direct tension. Aramid Fiber Reinforced Plastics (AFRP) bars were loaded at different stress levels. Development of grips to hold the specimens up to failure, accurate source location and noise elimination were given importance while conducting the experiments. The study shows that AE events were located at several different points along the length of the bar. Our study indicates that the AFRP bars have exhibited fracture of bond between fiber and resin or fiber breakage within the gage length, at several different locations. Event duration and event rate were correlated with the stress levels to distinguish between the actual fiber and the other types of failure such as breaking of epoxy coating, failure of resin, etc., in the AFRP bars.

Subject Headings: Bars (structure) | Fiber reinforced polymer | Composite materials | Material failures | Glass reinforced plastics | Failure analysis | Composite structures

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