Based on the modified Kong-Fang concrete model and the fluid structure interaction algorithm,the numerical simulation on damage and failure of concrete considering projectile cast thickness subjected to explosion was conducted.Firstly,the accuracy of parameters selection of the concrete material model was verified by precast hole explosion test and projectile penetration followed by explosion;Then,7 groups of working conditions were set for numerical simulation of explosion process considering different projectile cast thickness,and the influence of projectile cast thickness on damage area,crater size and load propagation attenuation of CF120 ultra-high performance concrete target was discussed.The numerical results showed that the damage area of the target increases obviously with the increase of shell thickness;The crater diameter and crater depth after considering the projectile cast increased to different degrees compared with that without it;Taking the charge diameter of 98 mm and the length of 1100 mm,the explosive performance is not significantly improved when the thickness of the projectile cast is between 5 mm and 10 mm.
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