Li, XN, Sung, PC, Patterson, EA 
ORCID: 0000-0003-4397-2160, Wang, WC and Christian, WJR ORCID: 0000-0003-3638-7297
(2023)
Identification of defects in composite laminates by comparison of mode shapes from electronic speckle pattern interferometry.
OPTICS AND LASERS IN ENGINEERING, 163.
p. 107444.
|
PDF
oa pub manuscript.pdf - Published version Download (4MB) | Preview |
Abstract
A novel technique for identifying defects in carbon fibre reinforced plates has been developed. Firstly, modal analysis by impact excitation was performed to obtain the first five resonant frequencies for three defect-free and three defective specimens with in-plane fibre waviness. Then amplitude-fluctuation electronic speckle pattern interferometry (AF-ESPI) was used to obtain the mode shapes at these frequencies. The contours of the nodal regions visible in the mode shapes were extracted using a specially-developed algorithm employing density-based spatial clustering of applications with noise (DBSCAN). Fourier descriptors, that are invariant to rotations, translations, and scaling, were used to decompose the contours to reduce data dimensionality and make comparisons. The differences in contours between the two sets of specimens showed that the 4th and 5th mode shapes can be used for identifying the presence of the waviness defects. This technique for nodal region comparison was found to greatly simplify the comparison of fringe patterns for the purpose of damage assessment and could potentially be used as part of validation procedures.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | Carbon fibre reinforced polymer, Fibre waviness, AF-ESPI, Modal analysis, Fourier descriptors |
| Divisions: | Faculty of Science and Engineering > School of Engineering |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 06 Jan 2023 10:02 |
| Last Modified: | 04 Feb 2023 16:32 |
| DOI: | 10.1016/j.optlaseng.2022.107444 |
| Related URLs: | |
| URI: | https://livrepository.liverpool.ac.uk/id/eprint/3166805 |
Dimensions
Dimensions
