Monitoring of compressive behaviour of stiffened composite panels using embedded fibre optic and strain gauge sensors

Růžek, Roman; Kadlec, Martin; Τσερπές, Κωνσταντίνος; Karachalios, Evangelos

doi:10.1108/ijsi-11-2015-0052

Cited by 21 publications

(12 citation statements)

References 30 publications

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“…The cause of the sudden changes can be seen in distortions of the Fibre Bragg Gratings (FBG) spectrum. The limited robustness of the fibre-optic sensors against damage and difficulties with fibre handling are important application problems that have been highlighted in the technical literature, as, for example, in [ 52 , 53 ].…”

Section: Resultsmentioning

confidence: 99%

Fibre Bragg Gratings for the Monitoring of Wooden Structures

2017

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The aim of this work was to develop and validate an experimental methodology suitable for analysing on-site the behaviour of fibre-reinforced wooden structures. The proposed measurement method is based on the application of fibre Bragg grating (FBG) strain sensors. An analysis of adhesive behaviour was performed preliminarily, which provided indications for choosing the type of adhesive and for the fibre bonding length in accordance with the volume of measurement. The first series of tests was carried out on wood samples to verify the coupling between the measuring sensor and the wood support when the latter is subject to mechanical stresses. The second investigation was done on site to test the behaviour of a historical wood floor before and after reinforcement by means of a series of tests performed using optical fibres with the Bragg grating. The optical fibre system measurements were compared to those obtained using a laser vibrometer, a measurement system of proven stability and precision. The comparison makes it possible to confirm the validity of the results and the reliability of the system for the monitoring of historic wooden structures.

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Section: Resultsmentioning

confidence: 99%

Fibre Bragg Gratings for the Monitoring of Wooden Structures

2017

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“…Structural health monitoring (SHM) is a promising nondestructive inspection technique which offers a realtime damage detection under operational and environmental conditions for aircrafts [6][7][8][9]. There are many different types of sensors that can be used in SHM, such as strain gauges [4], optical fibres (OF) [10], carbon nanotube (CNT) sensing networks [11], and piezoelectric lead zirconate titanate (PZT) transducers [12]. These sensors are normally installed on the surface of composites but can also be embedded inside the host structure.…”

Section: Introductionmentioning

confidence: 99%

Structural Integrity Assessment of Composites Plates with Embedded PZT Transducers for Structural Health Monitoring

Feng

2021

Materials

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Active sensing using ultrasonic guided waves (UGW) is widely investigated for monitoring possible damages in composite structures. Recently, a novel diagnosed film based on a circuit-printed technique with piezoelectric lead zirconate titanate (PZT) transducers has been developed. The diagnostic film is a replacement for the traditional cable connection to PZT sensors and has been shown to significantly reduce the weight of the host structure. In this work, the diagnosed films were embedded into composite structures during manufacturing using a novel edge cut-out method during lay-up, which allowed for edge trimming after curing. In this paper, the effect of fatigue loading on the integrity of PZT transducers is initially investigated. The electro-mechanical impedance (EMI) properties at different fatigue loading cycles were used as the diagnostic measure for the performance of the sensors. At the same time, the behaviours of UGW were investigated at different fatigue loading cycles. It was found that the EMI properties and active sensing behaviours remained stable up to 1 million cycles for the force ranges of 0.5~5 kN and 1~10 kN. Next, the effect of embedding the diagnosed film on the mechanical properties of the host composite structure was investigated. Tensile and compressive tests were conducted and the elastic modulus of composite coupons with and without embedded PZT diagnosed films were compared. The elastic modulus of composite coupons with PZT diagnosed films embedded across the entire coupon reduced by as much as 20% for tensile tests and just over 10% for compressive tests compared to the coupons without embedded sensors. These reductions are considered the worst-case scenario, as in real structures the film would only be embedded in a relatively small area of the structure.

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“…Figure 2 presents the methodology for the calibration of the numerical model based on flat test specimen tests. Fibre Bragg grating sensors were used and strain gauge measurements were performed for material calibration (Růžek et al, 2014(Růžek et al, , 2017.…”

Section: Introductionmentioning

confidence: 99%

High-speed impact assessment for composite air inlet

Doubrava

Oberthor

Bělský

et al. 2019

IJSI

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Purpose The purpose of this paper is to describe the approach for the design of a jet engine composite air inlet for a new generation of jet trainer aircraft from the perspective of airworthiness requirements regarding high-speed impact resistance. Design/methodology/approach Validated numerical simulation was applied to flat test panels. The final design was optimised and verified by validated numerical simulation and verified by testing on a full-scale demonstrator. High-speed camera measurement and non-destructive testing (NDT) results were used for the verification of the numerical models. Findings The test results of flat test panels confirmed the high durability of the composite structure during inclined high-speed impact with a near-real jet inlet load boundary condition. Research limitations/implications Owing to the sensitivity of the composite material on technology production, the results are limited by the material used and the production technology. Practical implications The application of flat test panels for the verification and tuning of numerical models allows optimised final design of the air inlet and reduces the risk of structural non-compliance during verification tests. Originality/value Numerical models were verified for simulation of the real composite structure based on high-speed camera results and NDT inspection after impact. The proposed numerical model was simplified for application in a real complex design and reduced calculation time.

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Monitoring of compressive behaviour of stiffened composite panels using embedded fibre optic and strain gauge sensors

Cited by 21 publications

References 30 publications

Fibre Bragg Gratings for the Monitoring of Wooden Structures

Fibre Bragg Gratings for the Monitoring of Wooden Structures

Structural Integrity Assessment of Composites Plates with Embedded PZT Transducers for Structural Health Monitoring

High-speed impact assessment for composite air inlet

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