Parametric optimization of grid-stiffened composite panels for maximizing their performance under transverse loading

The main focus of this paper is the optimization of geometry to maximize the specific energy absorption of E-glass/polypropylene isogrid composite panels under transverse quasi-static and dynamic impact loading using finite element analysis. The behavior of some of these grid-stiffened composite panels was also analyzed experimentally under high velocity impact loading, and the fluctuations observed in the load–time response during the impact event were attributed to structural resonances of the impactor, the isogrid panel or both combined. Parametric studies of varying the geometry (rib width and thickness; center-to-center distance between rib joints and skin thickness) to maximize specific energy absorption were performed. This study will help in recommending isogrid composite panels for the design and use in applications where impact energy absorption is important, such as in the side doors of automobiles.