Damage monitoring of CFRP retrofit using optical fiber sensors

Joshi, Kunal; Frketic, Jolie Breaux; Olawale, David; Dickens, Tarik

doi:10.1117/12.2086984

Cited by 4 publications

(3 citation statements)

References 16 publications

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“…More recent efforts towards damage detection in composites has led in use of triboluminescent (TL) materials as damage detectors. 6–10 The phenomenon of triboluminescence (TL) yields light emanation upon application of mechanical stress, and has long been thought of as a means to monitor initial crack propagation and for visualization analysis of fracture in composites. 11 Dickens et al.…”

Section: Introductionmentioning

confidence: 99%

Light emitting composite beams during matrix cracking

Joshi

Mishra

Campbell

et al. 2017

Journal of Composite Materials

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Defects in fiber-reinforced composite structures tend to initiate unpredictably and unalarmed due to local stress concentrations within a composite structure; this has given rise to active monitoring techniques that can quantify the mechanical stress within composites in order to evaluate the structural health. In this paper, triboluminescent mechanisms are used for damage monitoring of composite matrix under flexural loading. Vinyl ester resin is doped with ZnS:Mn phosphors and reinforced with glass fiber whiskers, were subjected to flexural loading while observing both the triboluminescent and acoustic response using a photo multiplier tube (PMT) and micro-mic respectively. Validity of triboluminescent emissions for determining structural integrity of glass fiber / vinyl ester resin composites through individual waveform analysis was examined. Understanding the failure modes through the captured waveform and observed triboluminescent emissions shows that the matrix cracking failure mode tends to lie in the natural frequency range of 2691–2813 Hz. High correlation between the triboluminescent and acoustic signals at matrix cracking at a frequency of 2800 Hz were found. Future research will discuss the triboluminescent and acoustic emissions behavior for delamination and fiber breakage failure modes.

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Section: Introductionmentioning

confidence: 99%

Light emitting composite beams during matrix cracking

Joshi

Mishra

Campbell

et al. 2017

Journal of Composite Materials

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“…Thus, it can be assumed that the sensitivity of the TL sensor is as low as 1 MPa which is lower than most of the commercially available stress sensors. The sensors have shown great potential of damage detection when embedded in fiber-reinforced polymer (FRP) composites (Joshi et al, 2015a(Joshi et al, , 2015b; however, the goal of this study is to investigate the performance of the TL sensors in the adhesive layer of an externally strengthened concrete member.…”

Section: Triboluminescencementioning

confidence: 99%

Concrete–fiber-reinforced polymer interfacial bond monitoring with self-triggering sensors

Joshi

Pollard

Chiari

et al. 2018

Journal of Intelligent Material Systems and Structures

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External bonding with fiber-reinforced polymers is currently one of the most popular technologies for rehabilitation of concrete structures. However, the effectiveness of the technology largely depends on the strength of the bond between the fiber-reinforced polymer laminate and the concrete substrate. This article provides a system to monitor the loss of bond between the fiber-reinforced polymer laminate and the concrete. Fiber optic sensors are broadly accepted as a structural health monitoring device for fiber-reinforced polymer materials by integrating the sensors into the host material. A recent development in fiber optic sensor technology is the mechanoluminescence-based optoelectronic sensors. Concrete beams strengthened with multifunctional fiber-reinforced polymer laminates were tested in shear using these sensors to evaluate the bond strength of the composite system. The sensors showed response to shear stress transfer in the adhesive layer which was observed to be as low as 2 MPa. The inclusion of sensors does not affect the bond strength (3.35 MPa), for both beams with sensors and without sensors. Real-time failure detection of fiber-reinforced polymer–strengthened beams was successfully achieved in this study. In future, the scheme aims at providing a tool to reduce the response time and decision making involved in the maintenance of deficient structures.

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“…Triboluminescence (TL) is the ability of a material to emit light when stressed, making it a feasible component for use in SHM systems. 11–14 Currently, TL being studied for use in SHM systems in composites for various applications in civil and aerospace industry, 6,13,15–17 ZnS:Mn crystals emit light during plastic and elastic deformation and have been shown to have one of the highest TL emission intensities. 18 This allows for a lesser density of crystals in the matrix of a composite to cause a measurable triboluminescent TL emission during impact.…”

Section: Introductionmentioning

confidence: 99%

Measurement of impact force for triboluminescent-enhanced composites by modified impulse method

Frketic

Ariza

Olawale

et al. 2016

Journal of Reinforced Plastics and Composites

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Barely visible impact damage in composites can result in hidden damage such as delamination and cracking. Triboluminescence is currently being looked at as a way of inundating composites with a sensory level mechanism for impact events. ZnS:Mn doped resin sensing plates are embedded within glass fiber-reinforced composites and are impacted at low velocities (3.45-3.51 m/s). The damage created by the impact can be seen under black light analysis and allows for quick visual inspection of the composite. The striker during impact registers a bounce which can be used to determine final impact velocity, which in turn defines the force at impact. By measuring the amount of time between consecutive impacts, an indirect estimation of impact force was made using the temporal occurrence of triboluminescence. Triboluminescent emissions occurred for impacts greater than 300 N. The measured impact energy averaged 36.79 J (AE0.48). The calculated impact force and impact energy corresponded to the amount of damage area found on the composite, showing that triboluminescent crystal inclusion into composites can provide damage sensing capability to woven fiber composites.

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Damage monitoring of CFRP retrofit using optical fiber sensors

Cited by 4 publications

References 16 publications

Light emitting composite beams during matrix cracking

Light emitting composite beams during matrix cracking

Concrete–fiber-reinforced polymer interfacial bond monitoring with self-triggering sensors

Measurement of impact force for triboluminescent-enhanced composites by modified impulse method

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