1 Ocak 2018 Dergi makalesi Açık Erişim

Yilmaz, C.; Akalin, C.; Gunal, I.; Celik, H.; Buyuk, Murat; Suleman, A.; Yildiz, M.

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    <subfield code="a">A hybrid damage assessment for E-and S-glass reinforced laminated composite structures under in-plane shear loading</subfield>
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    <subfield code="a">Micro-damage initiation and accumulation in two different Glass Fiber Reinforced -E-glass and S-glass-Laminated Composite Structures (LCS) subjected to in-plane shear stressing are monitored with Acoustic Emission (AE) and thermography methods. AE signals caused by micro-damage formation are graphed as a scatter plot of Weighted Peak Frequency (WPF) versus Partial Power 2 (PP2) features and clustered using the K-means algorithm with Bray Curtis dissimilarity function thus resulting in three different well-separated clusters. Each of these clusters corresponds to different micro damages, i.e., transverse cracks, delaminations, or fiber ruptures. It is observed that the E-glass reinforced LCS has higher numbers of AE hits. Thus, the total amount of micro-damage incurred as well as the average temperature change measured by thermography is higher for the E-glass reinforced LCS. It is shown that due to the curing induced residual tensile stress in E-glass reinforced LCS, the initial formation of delamination in E-glass reinforced LCS starts at higher load level. Under the applied shear load, a significant reduction in in-plane shear modulus is observed both for the E-glass and S-glass-reinforced LCS where the E-glass reinforced LCS shows greater reduction. The decrease in in-plane shear modulus is attributed to micro-damage accumulated in the LCS.</subfield>
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    <subfield code="u">Univ Victoria, Dept Mech Engn, Ctr Aerosp Res, Victoria, BC V8W 3P6, Canada</subfield>
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