Fatigue monitoring of flax fibre reinforced epoxy composites using integrated fibre-optical FBG sensors

Szebényi, Gábor; Blößl, Yannick; Hegedűs, Gergely; Tábi, Tamás; Czigány, Tibor; Schledjewski, Ralf

doi:10.1016/j.compscitech.2020.108317

Cited by 35 publications

(12 citation statements)

References 28 publications

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“…Leather that is not used by the industry is used by adding unsaturated polyester (UPR) as a composite material. Fiber variations are divided into (2,5,7,10,12,15, and 20 % by weight). The finished composites were tested for mechanical strength, such as tensile strength, bending strength, and also their elastic modulus.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

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Analysis of mechanical strength of weight fraction variation sugar palm fiber as polypropylene-elastomer matrix reinforcement of hybrid composite

Santhiarsa

Praharsini

Suryawati

et al. 2021

EEJET

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Currently, the availability of polypropylene, elastomer and sugar palm fiber (Arenga pinnata) is very abundant, which has a good impact on the potential for the development of new composite materials that have good properties and characteristics. Composites are generally a new material composed of two or more different materials with the aim of producing a new material that has better properties than the constituent material. In this study, polypropylene (PP) plastic and elastomer were used as a composite matrix reinforced with sugar palm fiber (Arenga pinnata). The purpose of this study was to determine the value of tensile strength, impact strength, and bending strength of composites with a weight fraction of 20 % (80:20), 30 % (70:30), and 40 % (60:40). Based on the results of the research on hybrid composites of polypropylene and fiber-reinforced elastomers, composites with a weight fraction of 20 % (80:20) got the lowest tensile strength value of 1.153 MPa, while composites with a weight fraction of 40 % (60:40) obtained the highest tensile strength value of 2.613 MPa. Composites with a weight fraction of 20 % (80:20) got the lowest tensile strain value of 0.0049 and the highest tensile strain value of 0.0067 was found in composites with a weight fraction of 40 % (60:40). For the impact strength, the 40 % (40:60) weight fraction composite got the lowest value of 45248.234 kJ/mm2, while the 20 % (80:20) weight fraction composite got the highest impact strength of 17649.97 kJ/mm2. For bending strength results, the composite with a weight fraction of 20 % (80:20) obtained the lowest bending strength of 1.7778 MPa, while the composite with a weight fraction of 30 % (70:30) obtained the highest bending strength of 4.8867 MPa. The highest bending strain was found in the composite with a weight fraction of 20 % (80:20), which was 0.0207.

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Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…Composites with good properties and characteristics are the result of the right mixture of fiber and matrix materials. Many of today's composites are made of smart materials such as shape memory polymers (SMP), piezoelectric, magneto-electro-elastic (MEE), electrorheological (ER) [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Analysis of mechanical strength of weight fraction variation sugar palm fiber as polypropylene-elastomer matrix reinforcement of hybrid composite

Santhiarsa

Praharsini

Suryawati

et al. 2021

EEJET

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“…Due to the mature processing technology and low fabrication cost, a variety of applications for FBG sensors have been proposed. Szebenyi et al [14] demonstrated the capability of FBG sensors integrated between the reinforcing layers of composites for cyclic creep strain monitoring and fatigue failure prediction. Hong-kun et al [15] reported an optical fiber pressure sensor using two FBGs to reduce the cross-sensitivity between the temperature and pressure, leading to a high pressure sensitivity of 1.198 nm/MPa in the range of 0-1 MPa.…”

Section: Introductionmentioning

confidence: 99%

Real-Time Temperature Monitoring under Thermal Cycling Loading with Optical Fiber Sensor

Her

Tasi

2022

Sensors

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A fiber optic sensing system consisting of a fiber Bragg grating (FBG) sensor, optical circulator, optical band pass filter and photodetector is developed to monitor the real-time temperature response of a structure under a dynamic thermal loading. The FBG sensor is surface-bonded on a test specimen and integrated with an optical band pass filter. As a broadband light source transmits into a FBG sensor, a specific wavelength is reflected and transmitted into an optical band pass filter. The reflected wavelength is significantly affected by the temperature, while the output light power from the optical band pass filter is dependent on the wavelength. By measuring the light power with a photodetector, the wavelength can be demodulated, resulting in the determination of the temperature. In this work, the proposed optical sensing system was utilized to monitor the dynamic temperature change of a steel beam under a thermal cycling loading. To verify the accuracy of the fiber optic sensor, a thermocouple was adopted as the reference. The experimental results illustrate a good agreement between the fiber optic sensor and thermocouple. Electronic packages composed of various components such as a solder joint, silicon die, mold compound, and solder mask are frequently subjected to a thermal cycling loading in real-life applications. Temperature variations’ incorporation with mismatches of coefficients of thermal expansion among the assembly components leads to crack growth, damage accumulation and final failure. It is important to monitor the temperature to prevent a thermal fatigue failure. A fast response and easy implementation of the fiber optic sensing system was proposed for the real-time temperature measurement under thermal cycling loading.

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“…Several examples of usage of the FBG sensors written in standard single mode fibers (SMF) and their integration with composite materials for SHM applications can be found in the literature [ 1 , 7 , 8 , 9 , 10 , 11 ]. FBG sensors were integrated for monitoring of high pressure hydrogen composite vessels [ 12 , 13 ], blades of wind turbine [ 9 ], fast patrol boat [ 14 ], or a component of an aircraft [ 10 ].…”

Section: Introductionmentioning

confidence: 99%

In-Plane Strain Measurement in Composite Structures with Fiber Bragg Grating Written in Side-Hole Elliptical Core Optical Fiber

et al. 2021

Self Cite

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In this paper, the application of a fiber Bragg grating written in a highly birefringent side-hole elliptical core optical fiber for two-axial strain measurement is presented. Hybrid optical fiber structures achieved by combining large side-holes and elliptical core result in a very high birefringence of 1 × 10−3 and thus high initial Bragg peak spectral separation of 1.16 nm, as well as a very high transverse force sensitivity, of up to 650 pm/(N/mm) or even −1150 pm/(N/mm), depending on the fiber orientation with respect to the applied force. Due to the ~22 %m/m GeO2 concentration in the core the fiber being highly photosensitive, which significantly simplifies FBG fabrication by UV illumination without the need for prior hydrogen loading, which worsens thermal stability. Finally, the developed FBGs written in the highly birefringent side-hole elliptical core optical fiber were embedded in the square composite plates and applied for strain measurements. Tests of two-directional four-point bending have shown usability of such FBG for two-axial in-plane strain measurement with a single FBG in iso-thermal conditions.

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Fatigue monitoring of flax fibre reinforced epoxy composites using integrated fibre-optical FBG sensors

Cited by 35 publications

References 28 publications

Analysis of mechanical strength of weight fraction variation sugar palm fiber as polypropylene-elastomer matrix reinforcement of hybrid composite

Analysis of mechanical strength of weight fraction variation sugar palm fiber as polypropylene-elastomer matrix reinforcement of hybrid composite

Real-Time Temperature Monitoring under Thermal Cycling Loading with Optical Fiber Sensor

In-Plane Strain Measurement in Composite Structures with Fiber Bragg Grating Written in Side-Hole Elliptical Core Optical Fiber

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