Abstract
The article presents the characteristics of 1.3964 steel and the results of firing a 7.62 mm projectile with a steel core. A simplified Johnson–Cook material model for steel and projectile was used. Then, a FEM (finite element method) simulation was prepared to calibrate the material constants and boundary conditions necessary to be used in simulations of the entire hull model. It was checked how projectile modeling affects the FEM calculation results. After obtaining the simulation results consistent with the experimental results, using the model of a modern minehunter, the resistance of the ship’s hull to penetration by a small-caliber projectile was tested.
Highlights
The thickness of the hulls of warships depends on their combat purpose
The model showed a trend for a linear decrease in velocity with increasing sample thickness, which is inconsistent with the experimental results (Figure 8)
For the presented sample thicknesses up to 8 mm, the interaction time is too short and the friction coefficient is not significant
Summary
The thickness of the hulls of warships depends on their combat purpose. In extreme cases, it can be from 3 mm for mine warfare ships to even 650 mm on the 1941 battleship “Yamato” [1]. Nowadays, armored units are no longer used, which, along with the development of the quality of the produced steel and changes in the concept of war at sea (reduction of the use of artillery projectiles), has changed the thickness of the ships’ hulls. To reduce the ship’s magnetic field, glass-polyester laminates were used. These materials, in most cases, have almost no bullet resistance. In the case of watercraft, another important parameter is the mass above the center of gravity
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