Predicting the stacking sequence of E-glass fiber reinforced polymer (GFRP) epoxy composite using terahertz time-domain spectroscopy (THz-TDS) system

Park, Dong-Woon; Oh, Gyung-Hwan; Kim, Kwang Ho

doi:10.1016/j.compositesb.2019.107385

Cited by 37 publications

(11 citation statements)

References 50 publications

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“…NDT methods play a critical role in the evaluation and maintenance of composite materials. A wide variety of NDT techniques has been built on different principles [7,8], including x-ray computed tomography [9], terahertz testing [10,11], infrared thermography [12,13], shearography [14], eddy current testing [15,16], ultrasonic testing (UT) [17,18,19], etc.…”

Section: Introductionmentioning

confidence: 99%

Comparative study of ultrasonic techniques for reconstructing the multilayer structure of composites

Yang

Verboven

et al. 2021

NDT & E International

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Section: Introductionmentioning

confidence: 99%

Comparative study of ultrasonic techniques for reconstructing the multilayer structure of composites

Yang

Verboven

et al. 2021

NDT & E International

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“…About absorption spectra, the photon energy of terahertz wave (0.4-41meV) was in the same order of magnitude as the rotational and vibrational energy levels of a large number of organic compounds and biological macromolecules, thus the absorption spectra of these samples could be obtained nondestructively for qualitative and quantitative detection. The absorption spectra were presented as formula (2), where 𝑃 𝐿𝑜𝑔 − 𝑟𝑒𝑓 (𝜔) was the power of THz electromagnetic wave of the reflection signal without a sample, and 𝑃 𝐿𝑜𝑔 − 𝑠𝑎𝑚 (𝜔) was the power of the transmittance signal through a sample (Li et al" 2020;Park et al, 2019). All the experimental procedures can be seen in Figure 1.…”

Section: Thz Spectroscopy Systemmentioning

confidence: 99%

Rapid determination of capsaicin concentration in soybean oil by terahertz spectroscopy

Xia

Liu

Shi

et al. 2022

Journal of Food Science

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Capsaicin is the key composition of pepper and can be used as a marker of gutter oil for detection. The feasibility of rapid detection of capsaicin concentration in soybean oil was studied by terahertz spectroscopy. Genetic algorithm (GA) and principal component analysis (PCA) as the pretreatment method were used to obtain the best spectral features. Least square-support vector machine (LS-SVM), back propagation neural network (BPNN), and partial least squares (PLS) were combined with the pretreatment method to obtain the best determination model. The BPNN was combined with GA to obtain the best quantitative prediction results with the correlation coefficient of prediction (R P ), prediction root mean square error (RMSEP), the ratio of prediction to deviation (RPD), and range error ratio (RER) were 0.9309, 0.4030 µg/kg, 17.0421, and 2.4813, respectively. Furthermore, the detection limit of capsaicin could achieve 1.25 µg/kg in soybean oil and the accuracy of discrimination was up to 100% in the prediction set using the LS-SVM combined with GA pre-treatment. The results suggested that terahertz spectroscopy together with chemometric methods would be a promising technique for rapid determination of capsaicin concentration in soybean oil. Meanwhile, it is necessary to perform further experiments with real gutter oil samples before applying the method in practice.

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“…Moreover, due to the distinct anisotropy of the laminates, the properties and research methods of the laminates are different from the traditional materials. Therefore, the performance research of laminates is more complicated than other non-layered materials [7,8].…”

Section: Introductionmentioning

confidence: 99%

Curing kinetics, mechanical properties and thermomechanical analysis of carbon fiber/epoxy resin laminates with different ply orientations

Zhang

Dong

et al. 2021

Iran Polym J

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In this study, the nonisothermal differential scanning calorimetry (DSC) was carried out to evaluate the curing reaction of fiber/epoxy laminates. The optimal curing process of the prepreg was obtained by T-β extrapolation method and n th -order reaction curing kinetic equation. The bending strength, impact strength and thermodynamic properties of the composite laminates with different ply orientations were investigated, respectively. The results show that the apparent activation energy and the reaction order of the prepregs are 82.89 kJ/mol and 0.92, respectively. The curing process of carbon fiber/epoxy resin prepreg is 130 ℃ /60min + 160 ℃/30 min. The bending strength of [0]10 laminate is 1948.3 MPa, which is 11.8 times higher than that of [+45/-45]5s laminate, and 96.4% higher than that of [0/90]5s laminate. The impact strength of [0]10 laminate is higher than that of [+45/-45]5s and [0/90]5s laminates. The glass transition temperature (Tg) of the laminates is 142~146 ℃, and the loss factor of [0]10 laminate is significantly higher than that of [+45/-45]5s and [0/90]5s laminates. This research provides a theoretical basis for the further application of prepregs to fiber composite materials.

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Predicting the stacking sequence of E-glass fiber reinforced polymer (GFRP) epoxy composite using terahertz time-domain spectroscopy (THz-TDS) system

Cited by 37 publications

References 50 publications

Comparative study of ultrasonic techniques for reconstructing the multilayer structure of composites

Comparative study of ultrasonic techniques for reconstructing the multilayer structure of composites

Rapid determination of capsaicin concentration in soybean oil by terahertz spectroscopy

Curing kinetics, mechanical properties and thermomechanical analysis of carbon fiber/epoxy resin laminates with different ply orientations

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