Analysis of grain intensity in artillery missile motor during launching

To analyze the intensity of grain under high overload, three-dimentional viscoelastic large deformation incremental constitutive equation was derived based on Total Lagrangian method. By finite element method, the stress and strain distribution of grain of solid rocket during launching was simulated. The results show that the maximun equivalent Von Mises stress and strain appear on the base of the grain, and the grain would not destroyed by them. The change of the contact area between the grain and the motor case can affect the value of the maximun equivalent Von Mises stress and strain. The cutting on the both sides of the grain brings about the stress convergency.