Energy Absorption in Stitched Composite Sandwich Panels

The energy absorption characteristics of a stitched sandwich panel were investigated using experimental and analytical techniques. The structural stability aspects of the proposed mechanism were evaluated using the existing buckling and wrinkling theories. The effect of through-the-thickness stitches on the stability characteristics was investigated using finite element analysis. The configuration of the energy absorption mechanism was based on the stability analysis. The actual energy absorption process was characterized by conducting static crush tests. The experimental results indicated an increase in energy absorption capability with smaller stitch spacing and also resulted in smoother load deflection curves. A broad design guideline was developed for the design of a sandwich panel for energy absorption, based on stability analysis and experimental results.