Yazar "Turker, Mehmet" seçeneğine göre listele

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    INVESTIGATION OF THE BALLISTIC AND MECHANICAL PROPERTIES OF THE PRE AND POST-WELDED 7039 ALUMINUM ALLOY
    (Gazi Univ, Fac Engineering Architecture, 2011) Erdem, Mehmet; Turker, Mehmet
    In this study, the special weld grooves was created on 7039 Al-Zn armor plate with different thickness of 12.7 and 38 mm and they were welded with MIG welding technique via multiple pass. After that, the ballistic and mechanical properties of these plates were examined. V-50 ballistic limit values of the base metal, the heat affected zone and the weld metal of the welded plate of 38 mm thickness were determined by shooting with laboratory bullets of 12.7 mm. 12.7 mm thickness welded plates were used for determining the mechanical properties. It is observed that the ballistic and mechanical properties of the welded samples decrease. Moreover the highest V-50 ballistic limit value was obtained from the base metal whereas the lowest V-50 ballistic limit value was obtained from the welded metal.
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    Mechanical and ballistic properties of powder metal 7039 aluminium alloy joined by friction stir welding
    (Elsevier, 2016) Erdem, Mehmet; Cinici, Hanifi; Gokmen, Ugur; Karakoc, Halil; Turker, Mehmet
    7039 Al alloy plates which were used as armor materials were produced by powder metallurgy method. The prepared mixed powders were pressed and plated by extrusion process. These plates, after being subjected to T6 heat treatment, were joined double-sided by friction stir welding method. Microstructure and microhardness of the welded plate were investigated. It was determined that the finest grain structure and the lowest hardness value occurred in the stir zone as 2-6 mu m and HV 80.9, respectively. In order to determine the ballistic properties of welded plates, 7.62 mm armor piercing projectiles were shot to the base metal (BM), heat affected zone (HAZ), and thermomechanically affected zone+stir zone (TMAZ+SZ). Ballistic limits (v(50)) of these zones were determined. The ballistic limits of the BM, TMAZ+SZ, and HAZ of the plate were approximately 14.7%, 15.3%, and 17.9% lower than that of the standard plate at the same thickness, respectively. It was determined that the armor piercing projectiles created petaling and ductile hole enlargement failure types at the armor plate. Ballistic and mechanical results can be enhanced by hot-cold rolling mills after extrusion and particle reinforcement.