Detection of Delamination Defects in Carbon Fiber Composites based on Infrared Thermal Imaging

Abstract

This paper designs a test piece of pre-built delamination defects inside the composite laminate. Six different sizes of Teflon films are preset inside the T700S/MTC811 carbon fiber/epoxy carbon fiber composite laminate to simulate the interior layering defect of the composite laminate. Infrared thermal imaging detection system is used to detect the interior defect of the composite laminate. The infrared image obtained is used to extract the damage or defect feature information using the principal component analysis method, and the wavelet threshold denoising, improved threshold denoising and other processing, and perform threshold segmentation on infrared images to obtain defect characteristic information, indicating that infrared thermal imaging can be used to detect 4 mm and above delamination defects inside carbon fiber composite laminates, and the detection effect can meet the defect determination requirements.