numerical and experimental analysis of impact and damage on composite sandwich panels with grid-stiffened core

A composite grid sandwich panel consists of a core with acomposite grid structure and two faces on both sides of the core.this study investigated low-velocity impact in grid sandwichpanels with grid cores experimentally and numerically byconstructing and performing experimental tests using abaqus finiteelement software. in the experimental part, three sandwich panelswith grid cores were made for the low- velocity impact test. in thenumerical part, three-dimensional elements were used, and damagewas solved via programming in the fortran language in abaqussoftware. the results showed that the use of foam in the core ofthese structures reduced deflection due to impact despite a slightincrease in the final weight of the structures.