Multiphysics Modelling of the Coupled Behaviour of Precision-guided Projectiles Subjected to Intense Shock Loads

Precision-guided projectiles (PGPs) are subjected to severe shock loads, often leading to the failure of the highly sophisticated embedded electronic systems (EES) responsible for guidance. It is the objective of this work to conduct a comprehensive explicit axisymmetric Lagrangian-Eulerian multiphysics finite element analysis of the entire launch process of PGPs accounting for coupling and interaction effects between the different media. The influence of these interaction and coupling effects on the local and global accelerations and pressures are studied. An extensive examination of the severity and frequency of the reflected waves and the effect of PGPs springback is conducted. The results reveal that the pressure drop at muzzle exit is the contributing factor determining the severity of exit accelerations. Moreover, the formation and interaction of shock waves has little effect on the projectile response. Finally, the interaction with barrel has a significant influence on projectile response, especially after muzzle exit.M.A.S.2018-03-01 00:00:0