Test and estimation of ballistic armor performance for recent naval ship structural materials

Highlights

• Ballistic armor performance of the latest ship structure materials against a representative threat were tested and examined.

• This paper aims to suggest a methodology for accurately forecasting ballistic armor performance.

• It is suggested by a bare minimum of experimental results (2pt.) based on the penetration algorithm suggested by Tate.

• The correction factor(α) when compensating the target resistance pressure (H) in the algorithm is suggested.

• The difference was measured to be below 1.0% for AH36, AL5083, AL5086 except FRP compared with the experiment results.

Abstract

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 × 39 mm 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 (α) 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.