| The air gun test is a possible way to study the transient shock environment that a projectile is anticipated to encounter in an actual field test. The air gun test simulates the real gun test in a controlled environment by firing the projectile into an energy absorbing material like aluminum honeycomb. This thesis presents the use of Lagrangian and Arbitrary Lagrangian and Eulerian method in simulating the gun launch dynamics of a generic artillery component subjected to launch simulation in an air gun test. The aluminum honeycomb absorbs the kinetic energy of a projectile by deforming plastically. There are many material models for simulating aluminum honeycomb material in LS-DYNA. The MAT_CRUSHABLE_FOAM and MAT_MODIFIED_CRUSHABLE_FOAM material models are used for simulating the aluminum honeycomb. Four strike face geometry for aluminum honeycomb mitigator is studied - flat, double wedge, single wedge, and pyramid shape. The critical factors such as yield strength of the honeycomb and mass of momentum exchange mass (MEM - secondary energy absorbing device), which affect the dynamic response of projectile are studied. The acceleration, velocity and displacement of the projectile are compared to experiment results. |
