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We use the finite element software ANSYS to verify the explosion experiment about whether the projectile shell contains brittle zone, and the brittle with different width and depth to improve the fragmentation rate and lethality of shell material about 50SiMnVB. The simulation results show that the shell with a brittle zone is more explosive than with out’s; Within the allowable range, the bigger width of the brittle zone, the more uniform broken shell, the greater the projectile damage; the deeper depth of the brittle zone, the more easily the shell be broken, and fragment size close, the greater the projectile damage. Introduction In military industry, the broken degree and fragmentation rate of shell is the important standard to judge the projectile lethality. In order to improve the projectile lethality, our shell material changed with advances in technology. The 50SiMnVB is the most widely used now days. Without quenching the strength of 50SiMnVB can reach more than four hundred megapascals, so that the effective fragmentation rate has been greatly improved[1-4]. Under the condition of stress, brittle materials will produce brittle fracture which are more easily fracture compared with ductile materials in the same force. In order to improve the fragmentation of projectile shell and fragment mass destruction, using laser to machine a brittle zone on the shell with 50SiMnVB to research the effect of brittle zone to the shell material crushing process under the explosive impact[5-6]. Considering the limiting of actual validation criteria, the numerical simulation software ANSYS / LS-DYNA is selected to simulate and analyze the process of the particular experiment. Modeling Explosion occurs at high temperature, high pressure, and high strain rates. ANSYS software is based on energy, momentum, mass conservation equations of projectile explosion simulation study[7-9]. Simulation model was a quarter of the projectile, as shown in figure.1. Specific dimensions were explosives outside diameter 112mm,projectile shell inner diameter 112mm and outside diameter 122mm,the projectile height 60mm. High explosive material models and JWL equation of state were chosen as explosive material model. Plastic kinematic hardening model PLASTIC_KINEMATIC was chosen as the model of brittle materials which could be a good description of brittle fracture process. JOHNSON COOK model which is very suitable for the study material crushing process in the situation of high temperature, high pressure, and high strain rate and GRUNEISEN equation of state is chosen as projectile shell material. GRUNEISEN equation of state material pressure is defined as follows:        E a S S S a C p                                           0 2

Numerical Simulation for Crushing of Shell Material about 50SiMnVB Influenced by Brittle Zone