Person: GÜÇLÜ, HARUN
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GÜÇLÜ
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HARUN
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Publication Impact behavior of natural rubber based syntactic foam core sandwich structures(Walter, 2021-11-01) Güçlü, Harun; Kasım, Hasan; Türkoğlu, I. Kürşad; Can, Yucel; Yazıcı, Murat; GÜÇLÜ, HARUN; YAZICI, MURAT; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Otomotiv Mühendisliği Bölümü; 0000-0002-5679-313X; 0000-0002-8720-7594; M-4741-2017; Q-8738-2018In this study, the impact behavior of sandwich panels of natural rubberbased syntactic foam cores with aluminum face sheets was investigated experimentally and with the help of finite element analysis (FEA). Syntactic foam cores were produced byadding glass bubbles (GB) to the natural rubber (NR). Natural rubber was dissolved at room temperature with chemical solvents mixed with glass bubbles at 10, 20, and 30 weight percentages. Very low density (similar to 0.8 g x cm(-3)) and high compressible foams were obtained depending on the GB weight percentages. Aluminum face sheets and the NR/GB syntactic foam core developed were joined by adhesive bonding to produce sandwich beam specimens. The sandwich beams manufactured in this way were subjected to impact loading under three-point bending boundary conditions experimentally. The experimental results were compared with finite element simulation results under the same loading and boundary conditions. The damage mechanism of the sandwich panels devised were analyzed. According to the results, natural rubber containing an additive of 20 wt.-% GBs showed better impact resistance than the others.Publication Impact loading performance of polymer foam core aluminium sandwich panels(Polish Acad Sciences Inst Physics, 2019-04-01) Can, Yücel; Türkoğlu, I. K.; Güçlü, H.; GÜÇLÜ, HARUN; Kaşar, I.; Yazıcı, M.; YAZICI, MURAT; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Otomotiv Mühendisliği Anabilim Dalı.; 0000-0002-5679-313X; 0000-0002-8720-7594; Q-8738-2018; M-4741-2017In this study, two different foam core aluminum face sheets sandwich panels were developed. The core materials were selected as expanded polypropylene (EPP) and extruded polystyrene (XPS) foams. Two aluminum face sheets and foam cores were combined with flexible epoxy-based adhesives, under 20 N static compression load. The average density of the produced sandwich panels was 0.39 g/cm(3) for EPP foam core sandwich and 0.33 g/cm(3) for XPS foam core sandwich panel. Produced specimens were subjected 3-point bending experiments under impact loading. Damage behavior of the sandwiches was observed using post-mortem pictures. The results show that the produced sandwiches damaged perfectly plastic deformations with face sheets and core. There was not any adhesive and cohesive failure in the core and face sheets interfaces.Publication Investigation of the optimum vibration energy harvesting performance of electrospun PVDF/BaTiO₃ nanogenerator(Sage Publications Ltd, 2022-12-15) Güçlü, Harun; Kasım, Hasan; Yazıcı, Murat; GÜÇLÜ, HARUN; YAZICI, MURAT; Bursa Uludağ Üniversitesi/Mühendislik Fakültesi/Otomotiv Mühendisliği Bölümü.; 0000-0002-5679-313X; 0000-0002-8720-7594; Q-8738-2018; M-4741-2017The piezoelectric vibration energy harvesting performance of an electrospun poly(vinylidene fluoride) (PVDF)/Barium Titanate (BaTiO3) nanocomposite piezo polymer nanogenerator was investigated in this study. To obtain the highest piezoelectric output value, electrospinning was performed using four distinct solvent volume ratios of Acetone/Dimethylformamide (DMF) of 0:10, 2:8, 4:6, and 6:4 and three different PVDF weight percent polymer concentrations of 10, 15, and 20. Additionally, three distinct BaTiO3 addition weight percents of 5, 10, and 15 were investigated. The optimal concentration of PVDF (15 wt.%) was combined with a 6:4 volume ratio of Acetone/DMF to form a nanocomposite piezo polymer nanogenerator. The morphology and crystalline structure of PVDF and PVDF/BaTiO3 were analyzed using Fourier-transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) techniques. Nanocomposite piezo polymer nanogenerator was manufactured to harvest energy from vibration. A cantilever beam was developed without a tip mass type system for piezoelectric energy harvesting tests. The highest piezoelectric power output was obtained as 0.243 mu W (15 wt.% PVDF and 5 wt.% BaTiO3), Acetone/DMF (6:4 vol./vol.)) under 10 M Omega at the 15.7 Hz resonance frequency. The morphology of electrospun nanofibers has a significant impact on the piezoelectric performance of a nanocomposite piezo polymer nanogenerator at high-amplitude vibration.