Evaluation of Information Entropy from Acoustic Emission Waveforms as a Fatigue Damage Metric for Al7075-T6

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dc.contributor.advisorModarres, Mohammaden_US
dc.contributor.authorSauerbrunn, Christine Marieen_US
dc.contributor.departmentMechanical Engineeringen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2016-09-08T05:38:19Z
dc.date.available2016-09-08T05:38:19Z
dc.date.issued2016en_US
dc.description.abstractInformation entropy measured from acoustic emission (AE) waveforms is shown to be an indicator of fatigue damage in a high-strength aluminum alloy. Several tension-tension fatigue experiments were performed with dogbone samples of aluminum alloy, Al7075-T6, a commonly used material in aerospace structures. Unlike previous studies in which fatigue damage is simply measured based on visible crack growth, this work investigated fatigue damage prior to crack initiation through the use of instantaneous elastic modulus degradation. Three methods of measuring the AE information entropy, regarded as a direct measure of microstructural disorder, are proposed and compared with traditional damage-related AE features. Results show that one of the three entropy measurement methods appears to better assess damage than the traditional AE features, while the other two entropies have unique trends that can differentiate between small and large cracks.en_US
dc.identifierhttps://doi.org/10.13016/M2ZR5T
dc.identifier.urihttp://hdl.handle.net/1903/18743
dc.language.isoenen_US
dc.subject.pqcontrolledMechanical engineeringen_US
dc.subject.pquncontrolledAcoustic emissionen_US
dc.subject.pquncontrolledAluminumen_US
dc.subject.pquncontrolledFatigueen_US
dc.subject.pquncontrolledInformation entropyen_US
dc.titleEvaluation of Information Entropy from Acoustic Emission Waveforms as a Fatigue Damage Metric for Al7075-T6en_US
dc.typeThesisen_US

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