Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Conference Object Improvement of the Joining Performance of Fiber-Reinforced Composite With Pa66 Nanofibers Produced by the Electrospinning Method(The Composites and Advanced Materials Expo (CAMX), 2023) Aktaş, Engin; Tanoğlu, Metin; Barışık, Murat; Tanoğlu,M.; Barışık,M.; Aktaş,E.; 01. Izmir Institute of Technology; 03.03. Department of Civil Engineering; 03.10. Department of Mechanical Engineering; 03. Faculty of EngineeringIn this study, electrospun polyamide-6.6 (PA 66) nanofibers were added to bond surfaces to improve the bond strength of a structural fiber-reinforced composite. For this purpose, the nanofiber were coated on the UD carbon/epoxy prepregs. Composite laminates were fabricated using the autoclave method, employing carbon/epoxy prepregs with/without PA66 nanofiber incorporation of bond region. A single lap shear, Charpy impact energy and Mode-I fracture toughness tests were applied to the reference and PA 66 coated samples to examine the effects of PA 66 nanofibers on the mechanical properties of the joint region of the composites. The morphology and fracture modes of the nanofibers were investigated by scanning electron microscopy (SEM). The thermal properties of PA66 nanofibers were investigated by the differential scanning calorimetry (DSC) method. It was found that the PA 66 nanofibers coated on the prepreg surfaces by electrospinning are very effective in improving the strength of composite joints. The results revealed that single lap shear and Charpy impact strength values of the composite joint are increased by about 79% and 24%, respectively, by coating PA 66 nanofibers to the joint region. The results also showed that by using PA 66 nanofibers, Mode-I fracture toughness value is improved by about 107% and Tg was not affected. Copyright © 2023. Used by CAMX - The Composites and Advanced Materials Expo with permission.Article Citation - WoS: 1Citation - Scopus: 1Proposals for Monitoring Current Conservation Condition of Historical Masonry Buildings: Matrone Church and Çardak Han Cases;(Istanbul University Press, 2020) Durmuşlar,F.; Ipekci,E.; Hamamcıoğlu Turan, Mine; Aktaş, Engin; 02.01. Department of Conservation and Restoration of Cultural Heritage; 02. Faculty of Architecture; 01. Izmir Institute of Technology; 03.03. Department of Civil Engineering; 03. Faculty of EngineeringThe aim of this study is to transfer the international developments related to the process of diagnosis and monitoring of historical masonry structures to the national area. The method chosen is to test the recommendations made at the international level on national cases and to discuss the results obtained by comparing them. A review of preliminary studies, on-site observations, measured surveys, material characterizations, mapping and visual analysis have been carried out. An examination of structural characteristics and observed failures have also been detailed. Related risks have been evaluated with criteria developed by taking into consideration condition classes defined in the UNI EN 16096, titled Conservation of Cultural Property - Condition Survey and Report of Built Cultural Heritage. According to the defined risks and classes, priorities of interventions were determined. Two historical masonry buildings which possess characteristics of different periods and present different damage types were selected: Matrone Church in Ildiri, Çeşme, Izmir and Çardak Han in Çardak, Denizli. The condition reports of the selected buildings have been prepared. The critical points in the condition reporting of historical masonry buildings were determined: accurate comprehension of the authentic structural characteristics and related failures have priority in maintaining historical masonry structures. Identification of condition class and risk assessment of each historic masonry building should be made in accordance with a standard specific to the cases of our country, but in line with the European standards and current developments in the field of architectural restoration. Thus, it will be possible to evaluate the conservation state of our masonry assets in comparison with each other. The content and priority of interventions can be well planned with the participation of the necessary disciplines. © 2020 The authors.