Akademik Veri Yönetim Sistemi
Tezin Türü: Yüksek Lisans
Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, Makina Mühendisliği Bölümü, Türkiye
Tezin Onay Tarihi: 2010
Tezin Dili: İngilizce
Öğrenci: Gökhan Öztürk
Danışman: RAİF ORHAN YILDIRIM
Özet:In this thesis, it is aimed to determine the ballistic limit thicknesses of ST-37 steel plates under oblique impact of bullets having hard steel core (DIN 100Cr6 at 61-62 HRc) by using both experimental and numerical methods. In experimental part, angles of attack of the bullets are changed from 0 to 70 degrees by 10 degrees increments. Bullet velocities are measured for each shot just before the impact and they are found to be between 790-830 m/s. The minimum plate thickness that is not perforated and the maximum plate thickness that is perforated are determined by conducting three shots for each angle of attack - plate thickness combination. After the monolithic case, for some angles, layered plate combinations are also investigated. In the numerical analysis part, Johnson Cook constitutive and failure models are used together with the data obtained from literature. Experiments are simulated numerically by using a commercial non-linear explicit hydrocode software package, ANSYS AUTODYN. Results of the numerical simulations and the experimental findings are presented in tabular and graphical forms and then compared to each other.