scholarly journals Ultrasonic Guided Wave Signal Based Nondestructive Testing of a Bonded Composite Structure Using Piezoelectric Transducers

Signals ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 13-24
Author(s):  
Kaleeswaran Balasubramaniam ◽  
Shirsendu Sikdar ◽  
Piotr Fiborek ◽  
Pawel H. Malinowski
Keyword(s):  
Nondestructive Testing ◽  
Composite Structure ◽  
Impact Damage ◽  
Spectral Element ◽  
Guided Wave ◽  
Adhesively Bonded ◽  
Full Field ◽  
Ultrasonic Guided Wave ◽  
Bonded Composite ◽  
Good Agreement

This paper presents ultrasonic guided wave (UGW) propagation-based nondestructive testing (NDT) of an adhesively bonded composite structure (ACS). In the process, a series of scanning laser Doppler vibrometry (SLDV)-based laboratory experiments and time-domain spectral element method (SEM)-based numerical simulations were carried out on an ACS with barely visible impact damage (BVID) and a hole. A good agreement was observed between the numerical and experimental UGW signals in the cases studied. Finally, a full-field and elliptical signal processing method-based NDT strategy was proposed that uses differential damage features of the registered UGW signals to identify different types of BVIDs in the ACS.

scholarly journals Nondestructive Analysis of Debonds in a Composite Structure under Variable Temperature Conditions

Sensors ◽  
2019 ◽  
Vol 19 (16) ◽  
pp. 3454 ◽  
Author(s):  
Shirsendu Sikdar ◽  
Abhishek Kundu ◽  
Michał Jurek ◽  
Wiesław Ostachowicz
Keyword(s):  
Wave Propagation ◽  
Ambient Temperature ◽  
Composite Structure ◽  
Composite Structures ◽  
Variable Temperature ◽  
Guided Wave ◽  
Monitoring Strategy ◽  
Nondestructive Analysis ◽  
Adhesively Bonded ◽  
Temperature Conditions

This paper presents a nondestructive analysis of debonds in an adhesively-bonded carbon-fibre reinforced composite structure under variable temperature conditions. Towards this, ultrasonic guided wave propagation based experimental analysis and numerical simulations are carried out for a sample composite structure to investigate the wave propagation characteristics and detect debonds under variable operating temperature conditions. The analysis revealed that the presence of debonds in the structure significantly reduces the wave mode amplitudes, and this effect further increases with the increase in ambient temperature and debond size. Based on the debond induced differential amplitude phenomenon, an online monitoring strategy is proposed that directly uses the guided wave signals from the distributed piezoelectric sensor network to localize the hidden debonds in the structure. Debond index maps generated from the proposed monitoring strategy show the debond identification potential in the adhesively-bonded composite structure. The accuracy of the monitoring strategy is successfully verified with non-contact active infrared-thermography analysis results. The effectiveness of the proposed monitoring strategy is further investigated for the variable debond size and ambient temperature conditions. The study establishes the potential for using the proposed damage index constructed from the differential guided wave signal features as a basis for localization and characterization of debond damages in operational composite structures.

Identification of multi-defects in an arched composite structure by the corrected probabilistic diagnostic imaging with the fused damage index

2021 ◽  
pp. 1045389X2110322
Author(s):  
Hashen Jin ◽  
Jun Li ◽  
Weibin Li ◽  
Xinlin Qing
Keyword(s):  
Diagnostic Imaging ◽  
Composite Structure ◽  
Shape Factor ◽  
Composite Structures ◽  
Damage Index ◽  
Guided Wave ◽  
Identification Accuracy ◽  
Size Information ◽  
Damage Indices ◽  
Ultrasonic Guided Wave

Due to the complicacy of geometry and structure in the arched composite structure, it is difficult to monitor various kinds of defects accurately. The developed damage probabilistic diagnostic imaging approach based on ultrasonic guided wave energy signal characteristics is very feasible for the structural health monitoring in the arched composite structures. However, the conventional probabilistic diagnostic imaging (PDI) approaches united with the signal energy damage indices ( DIs) have some limitations in the identification of the number, location and specific size information of multi-defects. Thus, the damage shape factor from the single damage-impaired path imminently demands to be majorized to raise the precision and stability of PDI approach in the damage recognition. A corrected probabilistic diagnostic imaging (CPDI) approach integrated with the damage shape factor [Formula: see text] needs to be recommended to precisely inspect the expansion of defect zones and different multi-defects in the arched composite structure. The availability and feasibility of the proposed methods has been validated by the experiments in the tested specimen. The results show that the fused frequency-domain energy DIs can be applied to indicate the expansion of defect zones quantitatively. It is proved that the defect identification accuracy of multi-defects from the CPDI approach can be improved by the majorization of damage shape factor, effectively. It is also clearly observed that the number, location and specific size information of different conditions of multi-defects can be distinguished by using the CPDI algorithm, availably.

Study on Ultrasonic Guided Waves in Fluid-Filled Pipes Surrounded by Water

2006 ◽  
Author(s):  
Shijiu Jin ◽  
Liying Sun ◽  
Guichun Liu ◽  
Yibo Li ◽  
Hong Zhang
Keyword(s):  
Guided Waves ◽  
Guided Wave ◽  
Ultrasonic Waves ◽  
Ultrasonic Guided Waves ◽  
Fluid Loading ◽  
Inspection Method ◽  
Ultrasonic Guided Wave ◽  
Oil Company ◽  
Non Destructive ◽  
Good Agreement

A new non-destructive pipe inspection method, ultrasonic guided wave method as well as the comparison between ultrasonics and guided waves is introduced. An investigation of the guided ultrasonic waves traveling along pipes with fluid loading on the inside and outside of the pipe is described. The effect of inner and outer media has been researched by considering a steel pipe with air and water inside and outside the experimental pipe. Site experiment was carried out on a heating pipe in the resident area of Bohai Oil Company, China. A typical cylindrical guided wave, longitudinal guided wave was used to examine pipes with artificial defects and its propagation characteristics along the pipe were studied. Good agreement has been obtained between the experiments and predictions for pipes with different loading on the pipe.

scholarly journals Impact of Adhesively Bonded Composite Joints with Edge Effect

2000 ◽  
Vol 9 (6) ◽  
pp. 096369350000900
Author(s):  
I.R. Farrow ◽  
K. Potter ◽  
A. Fisher ◽  
M. Kelly
Keyword(s):  
Impact Damage ◽  
Failure Surface ◽  
Pilot Project ◽  
Tensile Failure ◽  
Composite Joints ◽  
Adhesively Bonded ◽  
Low Velocity ◽  
Bonded Composite ◽  
Shear Cracking ◽  
Edge Damage

A pilot project has been carried out to investigate the effect of impact on single-lap bonded composite joints based on AS4-8552 laminates and Cybond BR4535A adhesive. Low velocity impacts at an energy level sufficient to cause barely visible impact damage, were conducted on single lap joint specimens at different joint positions. Impact caused delaminations in the upper and lower laminates and localised through-thickness cracking in the adhesive. Residual tensile joint strengths of the impacted joint specimens with near-edge damage were reduced to approximately 50% of the un-impacted value. Failure surface inspections revealed localised through-thickness adhesive shear cracking as a governor of the original impact delamination pattern in the laminates and laminate delamination as the cause of ultimate tensile failure.

scholarly journals Using Digital Image Correlation Techniques for Damage Detection on Adhesively Bonded Composite Repairs

2012 ◽  
Vol 21 (2) ◽  
pp. 096369351202100 ◽  
Author(s):  
M.A. Caminero ◽  
S. Pavlopoulou ◽  
M. López-Pedrosa ◽  
B.G. Nicolaisson ◽  
C. Pinna ◽  
...  
Keyword(s):  
Digital Image Correlation ◽  
Digital Image ◽  
Composite Plates ◽  
Image Correlation ◽  
Patch Repair ◽  
Adhesively Bonded ◽  
Full Field ◽  
Bonded Composite ◽  
On Line ◽  
Lamb Wave Propagation

The use of composite materials in aircraft industry has risen significantly in recent years. Bonded patch repair technologies provide an alternative to mechanically fastened repairs with significantly higher performance. In this work, the behaviour of scarf-type bonded patches in laminated composites are monitored using full-field measurement methods based on Digital Image Correlation (DIC) techniques which are validated against Lamb wave propagation analysis. The current work focuses on the performance and the on-line monitoring of the adhesively bonded patches in composite plates subjected to tensile loading

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