The Effects of Adhesive and Bonding Length on the Strain Transfer of Optical Fiber Sensors

Her, Shiuh-Chuan; Huang, Chih Yuan

doi:10.3390/app6010013

Cited by 18 publications

(16 citation statements)

References 20 publications

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“…The bonding length and the lower adhesive thickness were found to be the most significant variables, in agreement with previous studies 41,42,44–48 . While the relationship between lower adhesive thickness and bonding efficiency was once again inversely proportional, bonding length directly affected the efficiency .…”

Section: Finite Element Analysissupporting

confidence: 91%

“…Based on a similar hypothesis, Wan et al built an analytical model 41 and validated it by applying the extended Fourier amplitude sensitivity test 45 . Her and Huang also confirmed the influence of bonding length through analytical FEAs, 39,46 while Wan et al made an in‐depth study of the influence of the coating on bonding length 41 …”

Section: Limitations Of the Previous Analyses On Bonding Strain Transfermentioning

confidence: 94%

“…Curing time was about 24 h, Young's modulus 3.1 GPa, and the Poisson's ratio 0.3. Such adhesive was selected because its Young's modulus was on the center of the range of values reported in the previous studies 39,41,44,46,48 …”

Section: Validation Testmentioning

confidence: 99%

See 2 more Smart Citations

Effects of bonding on the performance of optical fiber strain sensors

Floris

Sangiorgio

Adam

et al. 2021

Structural Contr & Hlth

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Summary The structural health monitoring (SHM) of existing buildings, structures, and infrastructures has become increasingly important in recent years, while the interest of the scientific community is focused on the use of new high‐performance technologies. Fiber optic sensors have become particularly attractive, thanks to their potential for monitoring strain in smart structures. The performance of this new technology depends to a large extent on the bonding technique used for its manufacture. Although the related literature has identified a correlation between some efficiency issues and the geometrical parameters of the bonding and mechanical properties of the materials adopted, the phenomenon is still not completely understood. This paper describes an in‐depth study of the geometrical and mechanical parameters that influence the efficiency of optical fiber point sensors' surface bonding by synergistically related techniques such as computational simulation, experimental tests, sensor manufacturing, and data analysis. The paper's novelty is fourfold: (1) the investigation of the strain transfer mechanism of surface‐bonded fiber optic sensors by considering, for the first time, all the parameters influencing the phenomenon through a considerable number of finite element (FE) analyses (117 three‐dimensional FE models); (2) the development of a series of bonding efficiency predictive models; (3) the design of a specific laboratory test to validate the computational outcomes; and (4) the definition of useful guidelines for effective bonding manufacturing in order to maximize the performance of these sensors when acquiring monitoring data.

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Section: Finite Element Analysissupporting

confidence: 91%

Section: Limitations Of the Previous Analyses On Bonding Strain Transfermentioning

confidence: 94%

See 1 more Smart Citation

Effects of bonding on the performance of optical fiber strain sensors

Floris

Sangiorgio

Adam

et al. 2021

Structural Contr & Hlth

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“…The accuracy and sensitivity of a directly bonded FBG strain sensor mainly depends on various specific factors of each surface-bonded FBG, including the bonding length [10], recoating and adhesive materials [11,12], packing method [13][14][15] and even position of the FBG relative to the adhesive center [16]. The problem, known as "strain transfer", has been extensively studied for both embedded and surface-bonded FBGs [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Measurement accuracy of FBG used as a surface-bonded strain sensor installed by adhesive

Xue

Fang

et al. 2018

Appl. Opt.

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Material and dimensional properties of surface-bonded fiber Bragg gratings (FBGs) can distort strain measurement, thereby lowering the measurement accuracy. To accurately assess measurement precision and correct obtained strain, a new model, considering reinforcement effects on adhesive and measured object, is proposed in this study, which is verified to be accurate enough by the numerical method. Meanwhile, a theoretical strain correction factor is obtained, which is demonstrated to be significantly sensitive to recoating material and bonding length, as suggested by numerical and experimental results. It is also concluded that a short grating length as well as a thin but large-area (preferably covering the whole FBG) adhesive can enhance the correction precision.

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“…Tai-Wan Kai [26] performed the Fourier amplitude sensitivity test based on an empirical mechanical model to identify the most critical parameter influencing the strain transfer ratio. Shiuh-Chuan Her [27] developed a theoretical model to evaluate the effect of adhesive and bonding length on the strain transfer. Li Sun [28] conducted a strain transfer analysis of a clamped fiber Bragg grating sensor.…”

Section: Introductionmentioning

confidence: 99%

Strain Transfer Characteristic of a Fiber Bragg Grating Sensor Bonded to the Surface of Carbon Fiber Reinforced Polymer Laminates

Wang

Zhang

et al. 2018

Applied Sciences

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Structural health monitoring is of great importance for the application of composites in aircrafts. Fiber Bragg grating (FBG) sensors are very suitable for structure strain measurement. However, the strain measured by FBG sensors is different from the original strain in host materials. The relationship between them is defined as strain transfer. As composites are anisotropic, the traditional strain transfer model, which regards the elasticity modulus of host materials as a constant, is inadaptable. In this paper, a new strain transfer model is proposed for FBG sensors bonded to the surface of carbon fiber reinforced polymer (CFRP) laminates. Based on the measurement structure, the model is established and the transfer function is derived. The characteristics influencing the strain transfer are analyzed. The stacking directions, stacking numbers, and stacking sequences of CFRP laminates have a distinct effect on the transfer efficiency, which is different from the isotropy host materials. The accuracy of the proposed model was verified by experiments on a nondestructive tensile system, and the maximum model error is less than 0.5%. Moreover, the model was applied to the strain measurement of CFRP wing skin, which indicates that measurement errors decrease by 11.6% to 19.8% after the compensation according to the model.

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The Effects of Adhesive and Bonding Length on the Strain Transfer of Optical Fiber Sensors

Cited by 18 publications

References 20 publications

Effects of bonding on the performance of optical fiber strain sensors

Effects of bonding on the performance of optical fiber strain sensors

Measurement accuracy of FBG used as a surface-bonded strain sensor installed by adhesive

Strain Transfer Characteristic of a Fiber Bragg Grating Sensor Bonded to the Surface of Carbon Fiber Reinforced Polymer Laminates

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