• International Journal of Naval Architecture and Ocean Engineering
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• 제10권6호
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• pp.762-781
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• 2018

This paper presents the ballistic armor performance examination and thickness estimation for the latest naval ship structure materials in the Republic of Korea. Up to date, research regarding methods of ballistic experiments establishing database on the latest hull structure materials as well as a precise method of estimating required thickness of armor against specific projectiles have been rarely researched. In order to build a database and estimate proper thicknesses of structure materials, this study used four structure materials that have been widely applied in naval ships such as AH36 steel, AL5083, AL5086, and Fiber Reinforced Plastics (FRP). A $7.62{\times}39mm$ mild steel core bullet normally fired by AK-47 gun was considered as a threat due to its representativeness. Tate and Alekseevskii's penetration algorithm was also used to calculate a correction factor (${\alpha}$) and then estimate the armor thickness of naval ship hull structure materials with a given impact velocity. Through live fire experiments, the proposed method performance difference was measured to be 0.6% in AH36, 0.4% in AL5083, 0.0% in AL5086, and 8.0% in FRP compared with the experiment results.

• 한국항공우주학회지
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• 제43권5호
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• pp.440-448
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• 2015

운동에너지 막대 탄두 시스템은 기존 시스템의 장점을 결합한 새로운 형태의 요격탄두 시스템으로서 직격 파괴방식에 비해 표적 유도 정밀도에 대한 의존도가 낮을뿐더러, 고폭 파편 탄두 방식보다 더 높은 관통력을 제공해 준다는 장점이 있다. 본 논문에서는 다양한 운동에너지 탄두의 사출 방식 중 등방성운동에너지 탄두의 기폭, 전개모델을 소개하고, TATE 관통방정식을 이용하여 사출된 관통자의 관통 효과를 계산하였다. 또한 교전 성능 분석을 위한 방법을 제시하였으며, 다양한 교전 상황에 대한 몬테-칼로 시뮬레이션을 통해 최적의 교전 기하 및 기폭 시점을 도출하였다.

• 대한기계학회논문집
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• 제18권7호
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• pp.1759-1772
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• 1994

In this study, we re-examined the Tate's modified Bernoulli equation to study penetration phenomena for long rod projectile into single or multi-layered finite thickness plates. We used the force equlibrium equation at mushroomed nose/target interface instead of conventional pressure equation at the stagnation point. In our penetration model, we considered the velocity dependent $R_t$ value for semi-infinite target and considered only the back face effect for finite target. To compensate for $R_t$ value according to target's thickness and back face effect, we used the spherical cavity expansion theory for semi-infinite plate and used the cylindrical cavity expansion theory for finite plate. Also we developed the experimental technique using make screen to measure the penetration duration time at each layered plate. In 3-layered laminated RHA/mild steel/ A1 7039 plate, we observed that spall had occured around the back face of A1 7039 plate by the stress wave interaction. Through the comparison between theoretical and experimental data including Lambert's results, we conform that our study has good confidences.