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  4. Health monitoring of CFRP laminates under cyclic loading via vibro-acoustic modulation based measurements
 
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Health monitoring of CFRP laminates under cyclic loading via vibro-acoustic modulation based measurements

Publikationstyp
Journal Article
Date Issued
2023-01-18
Sprache
English
Author(s)
Willmann, Erik 
Boll, Benjamin  orcid-logo
Scheel, Moritz  
Meißner, Robert  orcid-logo
Fiedler, Bodo  orcid-logo
Institut
Kunststoffe und Verbundwerkstoffe M-11  
Molekulardynamische Simulation weicher Materie M-EXK2  
TORE-URI
http://hdl.handle.net/11420/14779
Journal
Composite structures  
Volume
308
Article Number
116696
Citation
Composite Structures 308: 116696 (2023-03-15)
Publisher DOI
10.1016/j.compstruct.2023.116696
Scopus ID
2-s2.0-85146437108
Publisher
Elsevier
Estimating the damage state of composites is essential since carbon fibre reinforced polymers (CFRP) have a complex damage and propagation behaviour. Accordingly, a comprehensive study of the effects of matrix cracks – e.g. their size and crack density – and the influence of different damage types and their interaction on the vibro-acoustic modulation (VAM) behaviour of CFRP specimens under fatigue loading was carried out. These effects were evaluated in two sets of commonly employed laminate layups. Firstly, in a cross-ply (CP) layup, the number of 90°layers was varied, with a constant areal weight (268 g/m2). Secondly, quasi-isotropic (QI) specimens were tested, where the areal weight was reduced from thick-ply to thin-ply (30–268 g/m2), changing the failure mode from a delamination-dominated to a brittle failure. After damage introduction under tension–tension loading (R=0.1), high-frequency Lamb waves are introduced via piezoceramic actuators and modulated by a low-frequency vibration using a servo-hydraulic testing machine. VAM correlates with the different damage behaviour and damage conditions in CFRP. For this purpose, the evolution of the sideband amplitudes, the modulation index, the signal in time domain and X-ray scans are used. Regardless of the layup, the degree of stiffness-reducing inter-fibre fractures and large-scale delaminations can be detected.
Subjects
Carbon fibre
Composite laminates
Damage progression
Health monitoring
Non-destructive testing
SHM
Thin-ply
Vibro-acoustic modulation
DDC Class
600: Technik
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