3D photothermal reconstruction of subsurface defects in notched multidirectional CFRP laminates due to tensile fatigue loading

• Main Authors: Gahleitner, L. (Author), Mayr, G. (Author), Meirer, K. (Author), Reitinger, B. (Author), Thummerer, G. (Author)
• Format: Article
• Language: English
• Published: Elsevier Ltd 2022
• Subjects: Carbon fiber reinforced plastics; CFRP laminate; Defects; Fatigue loadings; Fatigue of materials; Fibrous composites; Image reconstruction; Laminated composites; Multidirectional laminates; Multi-directional laminates; Photo-thermal; Photothermal reconstruction; Pulsed thermography; Subsurface defect; Subsurface defects; Thermography (imaging); Virtual wave concept; Wave concept
• Online Access: View Fulltext in Publisher
• ISBN: 09638695 (ISSN)
• DOI: 10.1016/j.ndteint.2022.102702

This paper presents results from 3D photothermal reconstruction of real subsurface defects in carbon fiber-reinforced polymers using the virtual wave concept. We apply pulsed thermography during and after interrupted fatigue loading in tensile-tensile configuration for notched multidirectional laminates. In addition, we discuss the influence of the ambient conditions from in-situ photothermal testing on the virtual wave signal. The results obtained from 3D photothermal reconstruction are directly compared with those obtained from laser ultrasound testing. To summarize, we demonstrate a practicable and fast 3D photothermal evaluation of subsurface defect evolution utilizing the virtual wave concept. © 2022 The Authors