Volumetric characterization of delamination fields via angle longitudinal wave ultrasound

The volumetric characterization of delaminations necessarily precedes rigorous composite damage progression modeling. Yet, inspection of composite structures for subsurface damage remains largely focused on detection, resulting in a capability gap. In response to this need, angle longitudinal wave u...

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Bibliographic Details
Main Authors: Wertz, John, Wallentine, Sarah, Welter, John, Dierken, Josiah, Aldrin, John
Format: Conference Proceeding
Language:English
Subjects:
Composite structures
Computer simulation
Delamination
Experimentation
Inspection
Longitudinal waves
Mathematical models
Parameter identification
Polymer matrix composites
Shadows
Structural damage
Ultrasonic imaging
Ultrasonic testing
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Summary:The volumetric characterization of delaminations necessarily precedes rigorous composite damage progression modeling. Yet, inspection of composite structures for subsurface damage remains largely focused on detection, resulting in a capability gap. In response to this need, angle longitudinal wave ultrasound was employed to characterize a composite surrogate containing a simulated three-dimensional delamination field with distinct regions of occluded features (shadow regions). Simple analytical models of the specimen were developed to guide subsequent experimentation through identification of optimal scanning parameters. The ensuing experiments provided visual evidence of the complete delamination field, including indications of features within the shadow regions. The results of this study demonstrate proof-of-principle for the use of angle longitudinal wave ultrasonic inspection for volumetric characterization of three-dimensional delamination fields. Furthermore, the techniques developed herein form the foundation of succeeding efforts to characterize impact delaminations within inhomogeneous laminar materials such as polymer matrix composites.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4974650