Browsing by Author "Kuzu, Eslem"

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A sandwich panel that autonomously repairs sudden large holes and defects for tankers and pipelines carrying hazardous matter
(Sage Publications Ltd, 2022-04-12) Özer, Hakkı; Kuzu, Eslem; Özada, Çağatay; Ünal, Merve; Kasım, Hasan; Yazıcı, Murat; ÖZER, HAKKI; Kuzu, Eslem; Özada, Çağatay; Ünal, Merve; YAZICI, MURAT; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Otomotiv Mühendisliği Bölümü.; 0000-0003-1503-1232; 0000-0002-8720-7594; AAC-5342-2021; M-4741-2017; AAG-9987-2021; FOL-7608-2022; FFS-9528-2022; AAG-9987-2021
The self-healing of micro and macro cracks is vital for eliminating defects such as damage progression and loss of strength in structures. In this study, a polyurethane (PU) based geometrically self-healing sandwich structure was developed. The geometric healing agent, PU resin and activator, were filled into macrocapsules, and these capsules were filled into the Aluminum (Al) honeycomb cells. Self-healing of structural strength, large holes and cracks in developed sandwich structures were investigated by performing quasi-static compression and impact penetration tests. The sandwich structure with a self-healing capsules-filled core was damaged by subjecting it to quasi-static and penetration impact loads, and the healing agents in the broken capsules were mixed. The damage in the specimen was removed by geometric self-healing. Liquid and air permeability tests were applied to the PU foam used as a healing agent. No liquid permeability was observed in the structure. In addition, significant reductions in air permeability were obtained. Scanning electron microscope images were used to explore the characterization of the PU foam structure cells.
Sound insulation performance of honeycomb core aluminum sandwich panels with flexible epoxy-based foam infill
(Elsevier Sci Ltd, 2023-05-11) Boztoprak, Yalçın; Ünal, Merve; Özada, Çağatay; Kuzu, Eslem; Özer, Hakkı; Ergin, Furkan; Yazıcı, Murat; Ünal, Merve; Özada, Çağatay; Kuzu, Eslem; ÖZER, HAKKI; Ergin, Furkan; YAZICI, MURAT; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Otomotiv Mühendisliği Bölümü.; 0000-0003-1714-7394; 0000-0003-1503-1232; 0000-0002-8720-7594; M-4741-2017; AAG-9987-2021; AAC-5342-2021; FFS-9528-2022; FOL-7608-2022; IVA-3471-2023
The most distinctive features of sound insulation structures are their flexibility and porosity. Therefore, the flexible epoxy matrix material was made cellular using a suitable foaming agent. In addition, hollow glass mi-crospheres (HGMs) were added to the epoxy matrix. Thus, the sound wave refraction was increased by obtaining cavities in the cell walls. Structures with different densities and voids were created by changing the ratios of the filling material and foaming agents used in the sandwich. An aluminum (Al) honeycomb was used to protect the insulation materials' structural integrity and ensure the homogeneous distribution of sound waves. The effect of density differences on sound insulation values was investigated. The mechanical properties of sandwich struc-tures were determined using compression and three-point bending tests. The distribution of the filler in the matrix was visualized using SEM. TGA, DSC, thermal conductivity, dielectric, and flammability tests were also performed to determine their thermal, electrical, and flammability properties. During the formation of cells in the flexible epoxy, the HGMs were positioned in the cell wall by internal gas pressure. Low-density structures performed better at low frequencies, while high-density structures at high frequencies.
Termoplastik malzemeler için elyaf uyumlaştırma sistemleri ve lif/matris ara yüzey performansının incelenmesi
(Bursa Uludağ Üniversitesi, 2021-06-29) Kuzu, Eslem; Yazıcı, Murat; Bursa Uludağ Üniversitesi/Fen Bilimleri Enstitüsü/Polimer Malzemeler Anabilim Dalı.; 0000-0002-0067-0931
Karbon fiber kompozit malzemeler otomotivden havacılık sektörüne kadar geniş bir alanda kullanıma sahiptir. Yüksek mekanik, fiziksel ve kimyasal özellikleri sayesinde tercihler arasında yer alan karbon fiber, benzersiz kombinasyonuyla öne çıkar. Polar bir yüzeye sahip olmayan karbon fiberin ara yüzey bağlanma kuvveti düşüktür. Bu çalışmada ara yüzey performasının yükseltilmesi için oksidatif bir yöntem olan elektrokimyasal oksidasyon işlemi uygulanmıştır. Matris ve fiber arasındaki bağlanmayı artıran son adımda ise silan ajanları ile yüzeyde fonksiyonel gruplar oluşturulmuştur. FTIR testi ile karbon fiber üzerindeki yüzey işlemlerinin etkili olup olmadığı gözlemlenmiştir. Bu denemelerden elde edilen bulgular sayesinde bir karbon fiber için gerekli olan sizingdesizing aşamaları belirlenerek, sanayide uygulanabilir bir sistem geliştirildi. Termoplastik matris olarak kullanılan PP ile karbon fiber arasında oluşan ara yüzey uyumunun gözlemlenmesi için optik mikroskop ve SEM görüntüleri alındı. Ara yüzey performansının ölçümü için de Pull-out testi yapıldı.