Browsing by Author "Adin, Hamit"

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Hybridization Effect on Energy Absorption Capacity of Composite Crash Boxes
(Wiley, 2024) Erkek, Baran; Kosedag, Ertan; Adin, Hamit
Crash boxes are safety elements generally made of metallic materials and mounted on the chassis of vehicles to prevent possible injuries to driver and passengers by absorbing the energy generated during a collision and ensuring integrity of vehicle. In order to save fuel and reduce harmful gases released into the environment, the proportion of metallic materials used in vehicles is decreasing and being replaced by composite materials. While composite materials are as durable as metallic materials, they are preferred because they are lighter. In this study, circular composites consisting of glass (S1), aramid (S2), carbon (S3), and hybrid combinations of aramid-carbon-glass (S4), carbon-glass-aramid (S5), and glass-aramid-carbon (S6), all with epoxy resin matrices, were produced using the vacuum infusion method and investigated. Crush parameters, maximum peak loads and specific energy absorption of hybrid tubes with different fiber types and winding order were compared. S3 tube had the best energy absorption performance among all samples of 257.288 Joules, while the worst energy absorption performance was obtained for S2 tube with 30.944 Joules. Among the hybrid samples, the best result was determined as 166.50 Joule with hybrid S5. Although the energy absorption capacities of hybrid composite tubes were close to each other, they had lower results for energy absorption and specific energy absorption than S1 and S3. For specific energy absorption, as with energy absorption, the best result was obtained with S3, while the lowest result was obtained with S2.Highlights The aim of this study is to evaluate the performance of composite crash boxes. The effect of fiber type and hybridization was examined. Specific energy absorptions and maximum contact forces were compared. Cylindrical samples were produced by vacuum infusion. The variation of damage depending on fiber type was investigated. Production and post-test images of hybrid crash boxes. image
The Impact of Graphene Filler on the Energy Absorption of Hybrid Composite Crash Boxes
(Springer Heidelberg, 2024) Erkek, Baran; Kosedag, Ertan; Adin, Hamit
One of the safety components found in vehicles is crash boxes mounted on vehicle chassis. These boxes, when mounted on the vehicle chassis, are intended to preserve the integrity of vehicle and ensure safety of passengers inside during crashs. Since these crash boxes are generally made of metal, efforts are made to reduce the additional weight on vehicles. Therefore, like many other parts in vehicles, there is a tendency to move towards the use of composite materials in crash boxes. In our study, crash boxes with hybridization achieved by altering the winding sequences of glass, aramid, and carbon fibers, with addition of graphene, were experimentally compared in terms of maximum peak forces, energy absorption, and specific energy absorption. Samples were produced with 0.25% graphene addition, with glass fiber G0.25 g, aramid fiber A0.25 g, and carbon fiber C0.25 g, and in hybridization, winding sequences were internally aramid-carbon-glass ACG0.25 g, carbon-glass-aramid CGA0.25 g, and glass-aramid-carbon GAC0.25 g. Similarly, samples labeled G0.50 g-GAC0.50 g were produced with 0.50% graphene addition. As a result, the best maximum peak force and specific energy absorption were achieved with the 0.50% graphene-added C0.50 g, at 8.52 kN and 10.08 J/g respectively. While the best energy absorption was with C0.25 g at 228.25 J, the worst was with glass fiber G0.25 g at 21.78 J. The addition of graphene to A0.25 g and A0.50 g, namely the aramid fiber samples, significantly increased their values by forming a good structure.