Abstract
Four sets of experiments were carried out on penetrating the ship stiffened plate structures which were made of panel plates with different thicknesses and stiffeners with different sizes. Ballistic characteristics of projectiles were recorded by a high-speed camera system. Through analysis, it has been found that stiffeners can reduce the overall plastic deformation of the panel and make projectile attitude change significantly. The failure modes of stiffened plates, which are obviously different from the homogeneous plates, change accordingly with the change of impact points. In order to analyze the problem better, the stiffened plate is assumed to be composed by four parts, namely main panel plate, transverse large stiffener ventral plate, transverse large stiffener flange plate and longitudinal weak stiffener. The penetration process has been simulated by 3D analysis using ANSYS/LS-DYNA which was verified by experiments, and numerical simulations were carried out. Through the numerical and experimental results, a variety of failure modes have been observed. Failure modes of stiffened plates are found to be composed by four types and summarized.
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