Browsing by Author "Karahan, Emir Ali"
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Item Blast performance of demining footwear: Numerical and experimental trials on frangible leg model and injury modeling(Amer Soc Testing Maretials, 2018-03) Karahan, Emir Ali; Karahan, Mehmet; Karahan, Nevin; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu.; AAK-4298-2021; 8649952500; 22034801200TBThis study reveals the protective efficacy of a personal protective boot against mine blasts, both experimentally and numerically. By employing analyses conducted with the use of different amounts of explosives, the protective efficacy of the developed boot is compared to a typical military boot as reference. Both for analysis and verification tests, a ballistic gelatin covered frangible leg model was used. Strain energy that is exerted on the leg was determined with numerical analyses and verified with data obtained from strain gauges that were placed on the leg model. By employing the dynamic finite-element method, the physical injury that occurred to the leg model was examined and compared with the results of the blast test. The Type 2 boot decreased the strain energy by approximately 80 % compared with the Type 1 boot. This observation was also verified with measurements obtained from strain-gauge sensors placed along the tibia. It was observed that the damage occurring on the tibia was limited to local injuries and concentrated at a single spot without causing any fractures with the Type 2 boot. As a result of axial load, the leg with the Type 1 boot demonstrated fractures at several points rather than a fracture at a single point based on deflection. Hence, the latter case yields irremediable injuries.Item Development of an innovative sandwich composite material for protection of lower limb against landmine explosion: Mechanical leg test results(Sage Puplications, 2017-01) Karahan, Emir Ali; Karahan, Mehmet; Uludağ Üniversitesi/Teknik Bilimler Meslek Yüksekokulu.; AAK-4298-2021; 8649952500This paper includes results of the blast tests which were performed with the aim of comparing the energy absorption and protection efficiency of protective boots with different sole configurations. Tests were performed on a mechanical leg model vestured with protective boots. Load and three axis acceleration values were measured during the blast tests to determine the protection efficiency of boot samples. Herewith, it was understood that merely a monolithic composite layer used in a sole does not provide protection, whereas compressible metallic honeycomb material-based sandwich composites demonstrate better energy absorption. With the innovative sandwich composite material developed in this study, energy absorption was increased by 209% in comparison to monolithic composites.