Study on Influence of Bore Structure on Gun's Interior Ballistic Performances.

Considered the coupling effects of classical interior ballistic equations and band's engraving process, the solution of interior ballistic equations was taken as the boundary condition of the simulation for engraving process, and the results of the simulation were taken as the initial conditions for the interior ballistic equations in the next step iteratively. A coupled constitutive model considered visco-plasticity and ductile damage and based on continuum damage mechanics was introduced to simulate the band's damage process. The Von Mises yield criterion, Johnson-Cook hardening model and Johnson-Cook fracture strain model were adopted, and the model considered large strain, high strain-rate, thermal softening and damage evolution. The model was implemented in the explicit finite element code by using VUMAT subroutine of Abaqus\Explicit module. The band's engraving processes of two different bore structures were simulated, and the influences of different engraving conditions on the stress state of the band were analyzed. The effects of band's stress state and bore structure on the interior ballistic performances were pointed out. It is very useful for the design of bore structure. [ABSTRACT FROM AUTHOR]