Numerical and experimental analyses of projectile penetration in grid cylindrical composite structures under high velocity Impact

Due to the extreme increase in computational power over the recent years، numerical methods have gained the most proportion in analyzing composite structures and components because of the consideration complicated failure mechanisms such as delamination، fiber buckling and fiber breakage، matrix cracking، debonding ribs of skin and a combination of mentioned failure mechanisms. However exact three - dimensional modeling damages caused by impact phenomena is still a challenge. In present numerical work، the most advanced modeling techniques have been used to predict the behavior of composite structure under high velocity impact. The ribs and layers have been modeled using solid elements and a user defined material model with modified puck and Hashin (3D) failure criteria was implemented. Because these failure criteria do not exist in Commercial version of the Abaqus software، we have used Fortran software for writing these criteria so this capability was added to the software. Figures of velocity variations and force variations of projectile، damaged area، different mechanisms of fracture were reported as results and commented upon. In this study، The numerical results have been validated with experimental data and show very good agreement.