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Structural health monitoring in adhesively bonded composite joints

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dc.contributor.authorCaldwell, Steven, author
dc.contributor.authorRadford, Donald W., advisor
dc.contributor.authorSimske, Steven, committee member
dc.contributor.authorCale, James, committee member
dc.contributor.authorAdams, Henry, committee member
dc.date.accessioned2024-05-27T10:32:51Z
dc.date.available2024-05-27T10:32:51Z
dc.date.issued2024
dc.description.abstractComposite bonded aircraft structure is a prevalent portion of today's aircraft structural composition. Adequate bond integrity is a critical aspect of the fabrication and operational service life of aircraft structure. Many of these structural bonds are critical for flight safety. Thus, a major concern is related to the assurance of quality in the structural bond. Over the last decade, non-destructive bond evaluation techniques have improved but still cannot detect a structurally weak bond that exhibits full adherend/adhesive contact. Currently, expensive, and time-consuming structural proof testing is required to verify bond integrity. The objective of this work is to investigate the feasibility of bondline integrity monitoring via piezoelectric sensors embedded in the composite joint. Initially, a complex composite joint, the Pi preform, was analytically evaluated for health monitoring viability, with the results showing promising capability. Subsequently, due to experimental complexities, a simple, state-of-the-art composite single lap shear joint is selected for experimentation and analysis to measure and quantify the effect of incorporating a sensor within the bondline to evaluate and expand on the ability of the embedded sensor to monitor and assess the joint integrity. Simple flatwise tension joints are also studied to investigate an orthogonal loading direction through the sensor. The experimental results indicate that the embedded piezoelectric sensors can measure a change in the joint before the integrity degrades and fails on subsequent loadings, resulting in a novel approach for prognostic performance evaluation without detrimentally affecting the performance of the structural joint.
dc.format.mediumborn digital
dc.format.mediumdoctoral dissertations
dc.identifierCaldwell_colostate_0053A_18253.pdf
dc.identifier.urihttps://hdl.handle.net/10217/238494
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2020-
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectelectromechanical impedance
dc.subjectsingle lap shear joint
dc.subjectcomposite bond
dc.subjectstructural health monitoring
dc.subjectpiezoelectric sensor
dc.titleStructural health monitoring in adhesively bonded composite joints
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineSystems Engineering
thesis.degree.grantorColorado State University
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy (Ph.D.)

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