Yazar "Gunes, Recep" seçeneğine göre listele

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    A comparison study on experimental characterization of unidirectional fiber reinforced composites using strain-gauges and virtual extensometers
    (Walter De Gruyter Gmbh, 2023) Alci, Muhsin; Gunes, Recep
    The aim of this study is to characterize E-glass/epoxy unidirectional fiber reinforced composites using the digital image correlation method with virtual extensometer, which is a less laborious method than strain gauges, compare the results and investigate whether virtual extensometers can be used instead of strain gauges. Measurements in tensile and Iosipescu shear tests were made with both strain gauge and virtual extensometer. Unlike full-field strain measurements in literature, the strains were measured using virtual extensometers. Tensile test and in-plane shear test results gave very consistent results. The differences between the strain gauge and the virtual extensometer for the tensile and in-plane shear tests were less than 3% in the linear region. However, the out-of-plane shear test showed a larger difference of 8.6%. This study showed that the 2D digital image correlation method with virtual extensometers is highly sufficient to find the elasticity moduli and shear moduli in tensile and shear tests in the linear region. In addition, after the damage has started, more measurement data can be obtained with virtual extensometers than with strain gauges.
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    Phenolics release kinetics in sugared and sugar-free chewing gums: microencapsulated pomegranate peel extract usage
    (Wiley, 2018) Palabiyik, Ibrahim; Toker, Omer Said; Konar, Nevzat; Gunes, Recep; Guleri, Tuba; Alasalvar, Hamza; Cam, Mustafa
    In this study, it was aimed to investigate the potential of sugared and sugar-free chewing gum as a functional food with the addition of microencapsulated pomegranate peel extract (MEPPE) at different amounts. Application of certain chewing times (0, 1, 3 and 5 min) to MEPPE-incorporated gums resulted in a higher release rate of punicalagin and ellagic acid from sugar-free gum matrix than sugared gum matrix (P < 0.05). According to exponential rise model, sugared and sugar-free gums could release 38.3% and 75.6% of ellagic acid, 82.5% and 94.8% of punicalagin depending on the chewing time, respectively. Incorporation of MEPPE did not cause significant changes in quality parameters of chewing gum such as colour and texture. Therefore, the results indicated that chewing gum could be used as a carrier for bioactive compounds and depending on the bulk sweetener used was an effective factor in the release kinetics.