13th International Conference on Fracture June 16–21, 2013, Beijing, China -1- Numerical Simulations on the Perforation of Metal Plates under Normal Impact by Conical-nosed Projectiles Wu Qiaoguo1,*, Wen Heming2 1 National Technology Research Center on Pressure Vessel and Pipe Line Safety Engineering, Hefei General Machinery Research Institute, Hefei 230031, China 2 CAS Key Laboratory for Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027, China * Corresponding author: wuqiaoguo1015@163.com Abstract This paper examines the perforation of Weldox460E steel plates struck normally by rigid conical-nosed projectiles through numerical simulations. The modified Johnson-Cook constitutive relation and the Gruneisen equation of state for metal plates are implemented in ABAQUS/Explicit as a user-defined material model by means of a subroutine (VUMAT). Numerical simulations are conducted on the perforation of Weldox460E steel plates struck normally by conical-nosed projectiles and flat-ended projectiles, it is shown that the numerical results are in good agreement with experiments. Finally, the effects of various cone angles of conical-nosed projectiles on the failure modes of metal plates and the energies absorbed for perforation are discussed. Keywords Metal plates; Conical-nosed projectiles; Impact; Perforation; Numerical simulation 1. Introduction An understanding of the response of structures subjected to intense dynamic loads which produce large inelastic deformation and failure is very important for safety calculations and assessment in various engineering such as nuclear, chemical, transport, offshore, naval, aerospace, and defense industries. In particular, the deformation and perforation behavior of plates is important for the design of offshore and protective structures against projectiles, fragments generated from explosion or dropped objects. The problem has been extensively studied in the past, and several studies are available in literature. Comprehensive reviews on the subject can be found in the papers by Backman and Goldsmith [1], Corbett et al. [2], and Goldsmith [3]. Borvik et al. [4-6] carried out experimental and axi-symmetric numerical investigation of Weldox steel plates struck normally by blunt, hemispherical and conical nosed projectiles. The effects of target strength and projectile nose shape on the failure modes and ballistic limits of steel plates are studied. Rosenberg et al. [7] examined the process of ductile plate perforation by sharp-nosed rigid projectiles through 2D numerical simulations, and the normalized resisting stress exerted by the plates can be simply related to the normalized thickness of the plates. Iqbal et al. [8, 9] performed three-dimensional numerical simulations to study the behavior of ductile targets subjected to normal and oblique impact by sharp nosed cylindrical projectiles. Gupta et al. [10] dealed with the experimental and numerical investigations of aluminum target plates impacted by blunt, ogive and hemispherical nosed steel projectiles, and the effect of projectile nose shape, impact velocity and plate thickness on the deformation of the target plates was studied. Sun [11] carried out axi-symmetric numerical simulations of Weldox460E steel plates struck normally by flat-ended and conical-nosed projectiles using a viscoplastic constitutive model combined with ductile damage.
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