On deformation and perforation of ship structures under ballistic impacts

Abstract This paper investigates the characteristics of the deformation and perforation on thin-walled structures under ballistic impacts based on the DYNA3D numerical simulations. Perforation mechanisms of plates and numerical modelling techniques to simulate the response of thin-walled structures under ballistic impacts are discussed to some extent. A benchmark study on deformation and perforation of steel plates struck by a rigid projectile is made by a comparison with DYNA3D simulations and existing experimental results where available. Perforation behaviour of a naval shipside structure impacted by a cannon ball is simulated by DYNA3D. By the regression analysis of the present DYNA3D computations and some existing test data, a new empirical formula that relates impact energy absorbed up to perforation of the target plate with the impact velocity of the projectile is developed. The developed formula can cover a wider range of the impact velocity up to 800 m/s, while existing formulae are valid up to 120 m/s. It is concluded that the technology developed from the present study will be useful for design and hazard assessment of thin-walled structures to avoid the perforation by ballistic impacts.

[1]  N. Jones,et al.  A Study on the Large Ductile Deformations and Perforation of Mild Steel Plates Struck by a Mass—Part I: Experimental Results , 1997 .

[2]  N. Jones,et al.  A Study on the Large Ductile Deformations and Perforation of Mild Steel Plates Struck by a Mass—Part II: Discussion , 1997 .

[3]  Charles E. Anderson,et al.  Ballistic impact: the status of analytical and numerical modeling , 1988 .

[4]  D. D. Keough,et al.  Containment of Fragments from a Runaway Reactor , 1963 .

[5]  Jeom Kee Paik,et al.  Ultimate limit state design of steel-plated structures , 2003 .

[6]  Bo Cerup Simonsen,et al.  Energy absorption and ductile failure in metal sheets under lateral indentation by a sphere , 2000 .

[7]  Werner Goldsmith,et al.  The mechanics of penetration of projectiles into targets , 1978 .

[8]  T. W. Ipson,et al.  Ballistic Perforation Dynamics , 1963 .

[9]  Chun Lu,et al.  Efficient modeling of panel-like structures in perforation simulations , 2003 .

[10]  Tomasz Wierzbicki,et al.  EFFECT OF FRACTURE CRITERIA ON HIGH VELOCITY PERFORATION OF THIN BEAMS , 2004 .

[11]  S. R. Bodner,et al.  Analysis of the mechanics of perforation of projectiles in metallic plates , 1974 .

[12]  P. T. Pedersen,et al.  Collision and Grounding , 2006 .

[13]  S. R. Bodner,et al.  Experimental Investigation of Normal Perforation of Projectiles in Metallic Plates , 1974 .

[14]  Odd Sture Hopperstad,et al.  Perforation of 12 mm thick steel plates by 20 mm diameter projectiles with flat, hemispherical and conical noses: Part II: numerical simulations , 2002 .