Method for independent strain and temperature measurement in polymeric tensile test specimen using embedded FBG sensors

Summary This paper presents the experimental results of strain measurements made by the fiber Bragg grating sensors embedded into polymer composite materials (PCMs). A series of performed experiments are described to demonstrate the capability of fiber optic sensors to measure strains in the case of their pronounced gradient distribution within the material, under compression and tension, at cyclic variation of strains with time and at different temperatures. A measuring technique is presented, and the results of strain measurements during the process of preparation of PCM including measurements of residual process‐induced strains are discussed.The results of strain measurements made by fiber optic strain sensors (FOSS) are compared with the results of numerical modeling based on the finite element method and independent measurement data obtained with the use of a digital optical system Vic‐3D and other experimental devices. The comparison made shows good agreement between the results obtained by the experimental methods and numerical simulation.The results of numerical computations demonstrate that the embedment of optical fibers in a PCM introduces perturbations in the strain distribution pattern in the vicinity of optical fibers but practically does not cause changes in the value of the strain tensor component measured by the FOSS. The conclusions about applicability range of FOSS embedded into PCM were made based upon the numerical simulation. The interrelation model between Bragg wavelength peak shift and the strain of the optical fiber in the fiber Bragg grating area for the sensor that is not affected by the environment is proposed.

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“…A detailed description of optical phenomena, which occur in the FBGs and permit measuring the strains, can be found in literature …”

Section: Object Of Studymentioning

confidence: 99%

Measurement of strains by optical fiber Bragg grating sensors embedded into polymer composite material

Матвеенко

Шардаков

Voronkov

et al. 2017

Struct Control Health Monit

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“…The parametric variations in the grating region due to strain or temperature will lead to a shift in the Bragg wavelength. This wavelength shift can be used to measure strain and/or temperature [16].…”

Section: Principle Of Monitoring Steel Bar Corrosion By Fbg Straimentioning

confidence: 99%

Monitoring Corrosion Process of Reinforced Concrete Structure Using FBG Strain Sensor

Assala

Chai

Islam

et al. 2017

IEEE Trans. Instrum. Meas.

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Major factor effects the durability of a concrete structures is cracks formation induced by expansion of reinforcement corrosion. Therefore, monitoring and evaluating the corrosion level of structure is essential for its safety. In order to monitor corrosion, an innovative methodology based on Fiber Bragg Grating sensing technique was developed and tested in this paper. The method uses the volume of corrosion products to detect the evolution of corrosion. The corrosion process was accelerated by impressed current technique. A correlation between the FBG wavelength shift and corrosion percentage of reinforcement was found.

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“…The FBG working principle was explained in the paper [17,18]. If FBG and the host material were bonded perfectly, the strain of host material would be transferred to FBG.…”

Section: Basic Principle Of Fbgmentioning

confidence: 99%

“…The parameter p e is the optical fiber photo-elastic coefficient, α h is the thermal expansion coefficients of the host material and ξ is the thermo-optic coefficient [18]. From Equation (1), it is clear that the stain measured by FBG will depend on the strain of host material, the thermal expansion of host material and the temperature influence on index of refraction of the fiber optic sensor.…”

Section: Basic Principle Of Fbgmentioning

confidence: 99%

Nuclear Power Plant Prestressed Concrete Containment Vessel Structure Monitoring during Integrated Leakage Rate Testing Using Fiber Bragg Grating Sensors

Liao

Kong

et al. 2017

Applied Sciences

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Abstract:As the last barrier of nuclear reactor, prestressed concrete containment vessels (PCCVs) play an important role in nuclear power plants (NPPs). To test the mechanical property of PCCV during the integrated leakage rate testing (ILRT), a fiber Bragg grating (FBG) sensor was used to monitor concrete strain. In addition, a finite element method (FEM) model was built to simulate the progress of the ILRT. The results showed that the strain monitored by FBG had the same trend compared to the inner pressure variation. The calculation results showed a similar trend compared with the monitoring results and provided much information about the locations in which the strain sensors should be installed. Therefore, it is confirmed that FBG sensors and FEM simulation are very useful in PCCV structure monitoring.

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Method for independent strain and temperature measurement in polymeric tensile test specimen using embedded FBG sensors

Cited by 52 publications

References 12 publications

Measurement of strains by optical fiber Bragg grating sensors embedded into polymer composite material

Measurement of strains by optical fiber Bragg grating sensors embedded into polymer composite material

Monitoring Corrosion Process of Reinforced Concrete Structure Using FBG Strain Sensor

Nuclear Power Plant Prestressed Concrete Containment Vessel Structure Monitoring during Integrated Leakage Rate Testing Using Fiber Bragg Grating Sensors

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