Damage evaluation and strain monitoring of composite plates using metal-coated FBG sensors under quasi-static indentation

Kim, Sang Woo; Cha, Myung-Chan; Lee, In; Kim, Eun‐Ho; Kwon, Il‐Bum; Hwang, Tae-Kyung

doi:10.1016/j.compositesb.2014.03.012

Cited by 29 publications

(10 citation statements)

References 27 publications

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“…These measures of indentation response can then be related with the damage developed during each cycle of indentation test. These analyses were successfully applied to sandwich structures by [30], and composite laminates by [29,[31][32]. A good understanding of damage mechanisms of repaired composite laminates under transverse loading is important for the design and certification of the repair.…”

Section: Introductionmentioning

confidence: 98%

“…These non-transient out-of-plane point loads can be represented using quasi-static indentation (QSI) experiments [28]. Many authors have used different parameters to quantify local bending response in composite laminates for quasi-static indentation experiments [29][30][31][32]. The parameters that are commonly used to quantify local bending behaviour are peak load or ultimate load, absorbed energy, and dent depth or residual deformation.…”

Section: Introductionmentioning

confidence: 99%

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Effect of post-cure temperature and different reinforcements in adhesive bonded repair for damaged glass/epoxy composites under multiple quasi-static indentation loading

Andrew

Arumugam

Santulli

2016

Composite Structures

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Effect of post-cure temperature and different reinforcements in adhesive bonded repair for damaged glass/epoxy composites under multiple quasi-static indentation loading

Andrew

Arumugam

Santulli

2016

Composite Structures

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“…The damage profile of a repaired laminate is considerably influenced by the loading and exposure conditions [14]. Repaired composite laminates exposed to environmental aging conditions exhibit several distinct failure modes under indentation [36]. Indentation load on patch repaired laminate can lead to considerable matrix cracking, rear side fiber breakage and debonding amid the weak parent-patch interfaces.…”

Section: Introductionmentioning

confidence: 99%

Effect of Intra-Ply Hybrid Patches and Hydrothermal Aging on Local Bending Response of Repaired GFRP Composite Laminates

2020

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This study investigates the influence of intra-ply hybrid patches and hydrothermal aging on the indentation properties of patch repaired GFRP composites. Fabrics with various proportions of glass and Kevlar fibers were employed as the patches to achieve enhanced mechanical properties by hybridizing Kevlar and glass fibers together. Hydrothermal aging behavior of repaired composite laminates modified with water-resistant glass fibers in the outer layers was further investigated. Specimens were immersed in an environmental chamber containing seawater at temperatures of 30 (ambient), 50, and 70 °C until up to saturation. Damage mechanisms of repaired laminates were monitored using real-time acoustic emission (AE) technique. The experimental results showed that specimens repaired with 50G:50K patches offered superior performance than the virgin specimens. The hydrothermal aging effect on indentation behavior of the modified repaired specimens showed a considerable reduction in indentation properties, with higher strength retention exhibited by the repaired specimens modified with chopped glass fibers compared to the particulate fibers.

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“…Thus, a metal-coated FBG sensor shows superior mechanical properties and sensitivity when compared to those of bare FBG sensors (without an extra coating layer) or polymer-coated FBG sensor. Sometimes, an FBG sensor with an elastoplastic metallic coating can be used for damage evaluation based on “memory effects” (Choi and Kwon, 2015; Kim et al, 2014, 2015). The author (Kim et al, 2014, 2015) and several researchers (Choi and Kwon, 2015) applied the memory effects of an optical fiber sensor (OFS) with an elastoplastic metallic coating for damage evaluation of composite structures.…”

Section: Introductionmentioning

confidence: 99%

“…Sometimes, an FBG sensor with an elastoplastic metallic coating can be used for damage evaluation based on “memory effects” (Choi and Kwon, 2015; Kim et al, 2014, 2015). The author (Kim et al, 2014, 2015) and several researchers (Choi and Kwon, 2015) applied the memory effects of an optical fiber sensor (OFS) with an elastoplastic metallic coating for damage evaluation of composite structures. This implies that a metal-coated FBG sensor can recall the information of an impact behavior previously experienced by a host structure by referring to residual strains.…”

Section: Introductionmentioning

confidence: 99%

Signal characteristics of surface-bonded fiber Bragg grating sensor with elastoplastic metallic coating subjected to residual strain

Kim

2017

Journal of Intelligent Material Systems and Structures

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This study involved predicting the reflected spectrum of a surface-bonded fiber Bragg grating sensor with an elastoplastic metallic coating wherein residual strains are non-uniformly distributed on the sensor. A profile of residual strains was numerically calculated based on the stepwise numerical technique by adopting strain transfer analysis and was validated by finite element analysis. The reflected spectrum of a metal-coated fiber Bragg grating sensor was consequently simulated to obtain the calculated profile of residual strains through the Transfer-matrix (T-matrix) method and coupled mode theory. The results revealed that a non-uniform profile of permanently induced residual strains along the sensor makes the reflected spectrum distorted. Thus, it is necessary for a metal-coated fiber Bragg grating sensor with a 10-mm Bragg grating to be bonded to a minimum length of 16.0 mm to suppress the signal distortion. The study additionally investigated the effect of parameters of an elastoplastic metallic coating (i.e. thicknesses and mechanical properties) on the spectrum characteristics and proposed minimally required bonding lengths by considering these characteristics. The evaluated spectra of the metal-coated fiber Bragg grating sensors that consider various coating parameters will reduce measurement errors and provide directions to determine geometric parameters when the sensor is actually installed on a structure surface.

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Damage evaluation and strain monitoring of composite plates using metal-coated FBG sensors under quasi-static indentation

Cited by 29 publications

References 27 publications

Effect of post-cure temperature and different reinforcements in adhesive bonded repair for damaged glass/epoxy composites under multiple quasi-static indentation loading

Effect of post-cure temperature and different reinforcements in adhesive bonded repair for damaged glass/epoxy composites under multiple quasi-static indentation loading

Effect of Intra-Ply Hybrid Patches and Hydrothermal Aging on Local Bending Response of Repaired GFRP Composite Laminates

Signal characteristics of surface-bonded fiber Bragg grating sensor with elastoplastic metallic coating subjected to residual strain

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