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Terahertz time-domain spectroscopy for the inspection of dry fibre preforms.
- Source :
-
NDT & E International . Jul2024, Vol. 145, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- Liquid moulded polymer matrix composites (LM-PMCs) are increasingly used in aerospace, automotive and other industrial applications. Liquid moulding processes featuring dry fibre preforms provide flexibility and enable cost reductions for secondary load-bearing structures. However, preform variability and manufacturing reproducibility remain major obstacles to wider use in primary structures. The open literature records only marginal use of non-destructive inspection (NDI) methods for dry multilayer preforms due to technological limitations and cost of NDI methods. In this work, terahertz time-domain spectroscopy (THz-TDS) is used for inspecting three dry multilayer glass fibre preforms featuring different defects, for the first time. A novel time-domain enhancement method is compared with classical image processing methods, aiming at improving image contrast and detecting potential defects. Furthermore, THz B-Scan is used for verifying the accuracy of interply defect detection. Finite difference time domain is simulated for analyzing THz magnitude variation in time-domain. Finally, quantitative evaluation is applied to further illustrate the significant potential of THz-TDS for the inspection of dry fibre preforms. The results show that the errors on defects lengths, widths, angles, and diameters for THz-TDS are in the ranges 8.2 %–34.3 %, 18.67 %–75 %, 0.29 %–6.67 %, and 1.33 %–10 % respectively. [Display omitted] • Terahertz technology is used for multilayer dry glass fibre preforms inspection for the first time. • A novel time-domain image enhancement method is proposed. • A new method based on disturbances is used to verify the interply detection accuracy. • Quantitative evaluation is performed and the potential of industrial use is discussed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09638695
- Volume :
- 145
- Database :
- Academic Search Index
- Journal :
- NDT & E International
- Publication Type :
- Academic Journal
- Accession number :
- 177599089
- Full Text :
- https://doi.org/10.1016/j.ndteint.2024.103133