Tensile fatigue properties of fibre Bragg grating optical fibre sensors

Ang, Junwei; Li, H.C.H.; Herszberg, Israel; Bannister, Michael; Mouritz, A.P.

doi:10.1016/j.ijfatigue.2009.11.002

Cited by 40 publications

(24 citation statements)

References 10 publications

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“…After removal of the transducer from the substrate it was found that the fracture pieces were still joined together by the top surface silver electrode layer only. This effect is similar to that reported by Ang et al (2010), (p767) whereby the alignment of a broken optical fibre was preserved by the adhesive allowing reduced functionality to be retained. The voltage data shows that negligible output change occurred to the transducers when the substrates were loaded to 1000 µɛ and cycled.…”

Section: Cycle Count At Fracturesupporting

confidence: 89%

“…The following statement is relevant to all surface mounted sensors, "surface-mounted FBG sensors are used in most current applications because they pose no risk to structural integrity and do not require design changes and re-certification of the structure" ( (Ang et al, 2010), p762). For this reason, only the method of transducer surface attachment will be considered herein.…”

Section: Sensor Integrationmentioning

confidence: 99%

“…The presence of the polyimide layer did not reduce the effectiveness of the actuator (p1384). Polyimide ( (Ling et al, 2004), p318), ((Ang et al, 2010), p762) is also used as a protective layer on FBG sensors to improve handling characteristics of the fragile fibre. For the protective layer to be effective it must create a good interface ( (Wei et al, 2001), p4).…”

Section: 422mentioning

confidence: 99%

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Investigation of the effects of structure-sensor interaction on piezoceramic transducers for structural health monitoring applications

Favier¹

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Surface bonded piezoceramic transducers used for structural health monitoring that are subjected to high strain loading are at risk of being compromised by damage to the attaching bond line or to the piezoceramic sensing element. In consequence, when baseline sensor data for a healthy structure is compared to subsequent data obtained from damaged sensors, incorrect assessment of the state of the structure may occur.This project investigated and developed a novel method of attaching piezoceramic transducers to specially prepared thermoset composite surfaces using functional thermoplastic surfaces as bond line media with the aim to improve the protection of the transducer from the damaging effects of high strain structural loading.To evaluate the effectiveness of this new approach, the fatigue performance of thermoplastic weld bonded and cyanoacrylate adhesive bonded transducers were compared.Finite element analysis (FEA) of transducer-bondline-structure models showed that strain transfer from the structure to the piezoceramic element reduced as bond layer thickness increased or as the bond layer modulus decreased. The simulations indicated that within each material layer shear strain changes gradually and the rate of change is different for each material type. At dissimilar material interface boundaries shear strain has a common value but the change gradient differences within each material mean the interface is a likely location for transducer failure.For cyanoacrylate and thermoplastic bonding systems the availability of published data regarding bond strength is limited. Static tensile testing was undertaken to generate some of the bond strength data for different bond layer thicknesses and a range of surface roughness. The data showed that tensile bond strength increased with decreasing adhesive layer thickness and that for the range of surface roughness tested the relative performance of each bond line thickness was similar.To further examine the performance of the two different bonding systems, fatigue testing was undertaken. The relative performance of each system was compared using transducer output voltage and impedance data. Specimens were fabricated by bonding 10 mm diameter, 1 mm thick silver electroded piezoceramic transducers to appropriately ii prepared thermoset composite test coupons. Test samples were subjected to sinusoidal loading at 5 Hz and maximum strains of 1000 µɛ, and 2000 µɛ or 3000 µɛ.For both bond types, sensor voltage output showed an initial period of rapid decrease in amplitude before typically settling at an approximate steady state output. The lower voltage output from the thermoplastic bonded transducers indicated that the thermoplastic bond lines reduced strain transfer between the host structure and the piezoceramic sensing element.The fatigue test results showed that polyvinylidene fluoride (PVDF) bonded transducers experienced a reduced or similar decrease in performance relative to the cyanoacrylate bonded transducers for the same number of load cycles and strain ran...

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Section: Cycle Count At Fracturesupporting

confidence: 89%

Section: Sensor Integrationmentioning

confidence: 99%

Section: 422mentioning

confidence: 99%

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Investigation of the effects of structure-sensor interaction on piezoceramic transducers for structural health monitoring applications

Favier¹

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“…Optical fiber based biosensors are the epicenter of an extensive research work in the past few years [6,[12][13][14]. The use of optical waveguide based planar sensors is gaining attention due to their small size, greater robustness and amenable to integration with other optical components, higher compatibility with traditional micro-fabrication techniques, and allows simpler vertical fabrication [15].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity enhancement of metal clad planar waveguide sensor using metamaterial layer as a guiding layer

Pal¹,

Prajapati

Saini³

et al. 2015

Optik

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“…Optical fibre Bragg grating sensors (FBG) [7][8][9][10], which are already commercially available, are commonly used on structural health monitoring systems, to monitor several parameters such as strain, temperature and vibration [10]. Optical fibres have also been used to follow the life cycle of a composite material [11]; sputtered aluminium on an optical fibre is used to follow corrosion in an adjacent structure [4,12,13]; electroless deposit of copper on a optical fibre is used also to follow corrosion in structures [14]; optical pH sensors are used to monitor the variation of pH in particular areas and consequent evolution of corrosion [3] and fluorescent fibre optic sensors are used to detect corrosion products [5].…”

Section: Introductionmentioning

confidence: 99%