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Laser Shearography and Ultrasound Inspection of Composite Laminates with Overlapping Fiber Plies

When manufacturing or repairing structures with composite laminate materials, internal features of overlapping fiber plies and ply orientation misplacement can occur. These composite processing steps will influence material characteristics of the component and likely change the inspection results. As part of the quality assurance process, nondestructive evaluation methods are needed for inspecting laminated composites to ensure the materials are undamaged and meet the design parameters required for the structure’s intended application. The present study considers laser shearography and roller probe ultrasound techniques for inspecting laminated composites with overlapping fiber plies. The samples used in this study were designed and manufactured such that two different laminate thicknesses and three designs of overlapping fiber plies were considered. Each of the samples was manufactured using an 8-harness satin carbon fiber weave fabric and a thermoset resin. The benefits and limitations of using these two nondestructive inspection methods for assessing carbon fiber reinforced laminated composites with internal ply overlaps will be presented.

DOI: 10.32548/RS.2019.016

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