Ultrasonic spectroscopic analysis of impact damage in composites by using laser vibrometry

Derusova, D. A.; Вавилов, В. П.; Сфарра, Стефано; Sarasini, Fabrizio; Красновейкин, В. А.; Чулков, А. О.; Pawar, Sachin

doi:10.1016/j.compstruct.2018.12.050

Cited by 28 publications

(6 citation statements)

References 21 publications

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“…In a PZT/LDV scanning system, the PZT excites the guided wave and the scanning LDV measures the guided wave; different transducers are chosen based on the requirements. Vibration patterns [ 14 ] were obtained by using a piezoelectric transducer at 80 V and frequencies ranging from 0 to 100 kHz. The curved signal acquired from the resonance phenomenon was applied to realize the detection of multi-component defects.…”

Section: Introductionmentioning

confidence: 99%

A New Laser Ultrasonic Inspection Method for the Detection of Multiple Delamination Defects

2021

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Delamination is one of the most common types of defects for carbon fiber reinforced plastic (CFRP) composites. The application of laser techniques to detect delamination faces difficulties with ultrasonic wave excitation because of its low thermal conductivity. Much of the research that can be found in the literature has only focused on the detection of a single delamination. In this study, aluminum foil was pasted onto the surface of the composite so that it was vulnerable to ablation and could acquire a usable signal. Using a fully noncontact system with laser excitation at a fixed point and a scanning laser sensor, the effects of different aluminum foil sizes and shapes on the wavefield were studied for the composites; we decided to use a rectangle with 3 mm length and 5 mm width for laser excitation experiments. Wavefield characteristics of the composite plates were analyzed with single- and multi-layered Teflon inserts. Taking the time window for standard ultrasonic testing as a reference, the algorithms for localized wave energy with appropriate time windows are presented for the detection of single and multiple defects. The appropriate time window is meaningful for identifying each delamination defect. The algorithm performs well in delamination detection of the composites with one or multiple Teflon inserts.

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Section: Introductionmentioning

confidence: 99%

A New Laser Ultrasonic Inspection Method for the Detection of Multiple Delamination Defects

2021

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“…To this end, research on new techniques known as structural health monitoring (SHM) is being developed [ 1 , 5 , 17 , 18 , 19 , 20 ]. SHM systems use a number of advanced sensors, such as fiber Bragg grating (FBG) sensors [ 21 , 22 , 23 , 24 ]. There are also works connected with the application of laser vibrometers in SHM application [ 8 , 25 , 26 , 27 , 28 , 29 , 30 , 31 ], but authors have not found any information about the use of such sensors onboard ships.…”

Section: Introductionmentioning

confidence: 99%

Application of Laser Vibrometry to Assess Defects in Ship Hull’s Welded Joints’ Technical Condition

Szeleziński

Muc

Murawski

et al. 2021

Sensors

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The paper presents the measurement process and test results for six thin-walled plates with different dynamic characteristics caused by different defects of welded joints. The tests were carried out using non-destructive testing (NDT). The authors made an attempt to determine the validity of the use and degree of effectiveness of the tests based on laser vibrometry in detecting defects in welded joints. The tests of welded plates were carried out using displacement laser sensors and piezoelectric accelerometers, while the source of vibration extortion was a modal hammer. In the adopted measurement methodology, the application of accelerometers was to obtain the reference data, which allowed for comparison with the measurement data obtained from the laser vibrometer. The analysis of the obtained measurement data, in the fields of time and frequency, made it possible to verify the correctness of the data obtained by means of laser vibrometry and to determine the requirements which are necessary for the correct performance of NDT tests and in the future structural health monitoring (SHM) system of welded joints with the use of a laser vibrometer. The mathematical model developed in the MSC software Pastran-Nastran was also used in the work. The model was developed for the purpose of mutual verification of the measurement and calculation tests. At the present stage of work, it can be stated that the results obtained by laser vibrometry methods should be treated as a supplement to the research conducted with traditional piezoelectric accelerometers. In certain situations, they can be used as an alternative to accelerometers, due to the fact that laser sensors do not require direct contact with the examined object. Where the object under test may be in a strong electromagnetic field, optical sensors are better suited than contact sensors.

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“…Numerous studies had frequently designed systems to detect strain deformation and various types of failures such as thermal deformation, fiber cracking, debonding/delamination etc. in composites using different SHM methods under flexural deflection however, very less or no information was available about the influence of the location of the sensor on their sensitivity and damage detection [13][14][15][16][17][18][19]. Furthermore, no evidence is available in the literature to understand the response of the sensor in differentiating and quantifying damage during flexural deformation.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Monitoring, Identification and Quantification of Strain Deformation in Composites Under Cyclic Flexural Loading Using Nylon/Ag Fiber Sensor

et al. 2020

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Despite having vast structural applications, Composites are not exempt from limitations and are susceptible to deforming during operation. Therefore, it is essential to develop in-situ monitoring systems to avoid their catastrophic failure or high repairing cost. So, the objective of this study was to monitor the deformation behavior of composites subjected to cyclic flexural deformation in real-time using a Nylon/Ag fiber sensor. Nylon/Ag fiber sensor was integrated at different direction i.e. 0°, +45°, 90°,-45° gradually between each ply of the composite specimens which were then machined in star shape where each leg signified the direction of the sensor. These specimens were then tested under cyclic flexural deflection at the strain rate of 2mm/min for 10 cycles. Mechanical results of composite specimens and electrical response of each Nylon/Ag sensor fiber showed excellent repeatability however, each Nylon/Ag fiber sensor showed a specific resistance behavior because of their respective position. The increase or decrease in the resistance of the fiber sensor signified the presence of tensile or compressive strain respectively and the intensity of the signal quantified the amount of deformation. The results confirmed that the fiber sensor showed good potential as flexible sensor reinforcement in composites for in-situ monitoring, identification and quantification of the deformation.

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Ultrasonic spectroscopic analysis of impact damage in composites by using laser vibrometry

Cited by 28 publications

References 21 publications

A New Laser Ultrasonic Inspection Method for the Detection of Multiple Delamination Defects

A New Laser Ultrasonic Inspection Method for the Detection of Multiple Delamination Defects

Application of Laser Vibrometry to Assess Defects in Ship Hull’s Welded Joints’ Technical Condition

In-Situ Monitoring, Identification and Quantification of Strain Deformation in Composites Under Cyclic Flexural Loading Using Nylon/Ag Fiber Sensor

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