The Research On Numerical Simulation Of Driving Band’s Engraving Process And The Damage Mechanism Of Bore

Transversal cracks were found in the interior bore of a gun when there were little times firing inthe design finalizing test and the cracks were located in the area between the starting point of rifle lineand the maxim pressure point. The crack was caused by the friction between the driving band and theinterior bore which is too large and it is indicated that the irrational bore structure is the dominatingreason for the crack by either the theoretic analysis or the long-term experiment data accumulatedfrom the shooting range or contrastively analysis of the similar gun of foreign army. With borestructure, driving band and projectile of a new gun as the object three primary aspects were researchedbased on the advanced research project of force:1. The numerical simulation research of the driving band’s engraving process. Dynamics modelwas built to simulate the driving band engrave based on the nonlinear FE methods. The couplingeffect of the solution of the classical interior ballistics equations and the simulation of the bandengraving the bore was considered by software of ProE, Patran and Abaqus/CAE.2. The damage of the bore and the formation mechanism of the transversal crack during theengraving process were studied. Damage and failure behavior of material is the hot spot and thedifficult problem of the computational solid mechanics and it has important theoretical and realisticsignificance for the research of this problem. The Johnson-Cook fracture model and the GTNmicroscopic damage model were introduced into the nonlinear FE routine by the VUMAT subroutineof the Abaqus/Explicit module to simulate the damage of the bore. The location of the maxim damageand the damage area which were obtained by using the damage model which are consistent with thereal case. The mechanism of crack initiation was revealed.3. Research on the simulation of occasion of the transversal crack initialization. Transversalcracks were found in the interior bore of the gun when there were8-15times firing. The research wasdone on the HLC microscopic damage model and the firing times of the crack initialization wasobtained through these model, and results of the simulation were accord with the experiment data.