Experimental study on Dynamic Response of grid cylindrical composite structures under high velocity Impact

Grid cylindrical composite structures are being increasingly used in aerospace, aircraft and defense industries due to their attractive properties in strength and stiffness to weight ratios. The material examined in this research is manufactured by the filament winding process with [±65] 12 stacking sequence lay-up, all the ribs are made of continuous and unidirectional fibers so they are intrinsically stiff and strong. Gas gun available at impact laboratory of Tarbiat Modares University has been used for doing ballistic tests. In the present research the dynamic response and damage of grid cylindrical composite structures subjected to high velocity lateral impact loading are experimentally investigated.This study presents the effects of ribs on residual velocity of projectile and overall damage area. General results show that presence of ribs reduces the overall damage area. In fact, discrete ribs prevent spread cracks from one cell to it’s adjacent cells.

Keywords:

grid Composites , Damage , Delamination , Failure , Impact , cellular shape