Numerical and experimental investigation of fiber metal laminates with elastomeric layers under low-velocity impact

This study aims to investigate the effects of elastomers on fiber metal laminates (FMLs) subjected to low-velocity impact loads. A compounded natural rubber layer was added to conventional FMLs containing glass/epoxy composite plies and Al 6061-T6 layers, measuring its effect on the behavior of the structure in low-velocity indentation at energy levels of 25 and 45 J. It was found that the addition of an elastomeric layer to the back face of the composite layer increased structural toughness, pre-fracture deformation, and specific energy absorption while reducing damage and the maximum load. Moreover, positioning the elastomer at a closer distance to the frontal face reduced maximum load and energy absorption capacity. Then, the standard material characterization of tensile, shear, and compressive were performed via the universal testing machine and the split Hopkinson pressure bar apparatus. A numerical model was developed based on the advanced finite element code of LS-DYNA, and the results were validated by comparison to the experimental data.

Automated summary

This study investigates the effects of elastomers on fiber metal laminates (FMLs) under low-velocity impact loads. The addition of an elastomeric layer to conventional FMLs enhances structural toughness, pre-fracture deformation, and specific energy absorption, while reducing damage and maximum load. Placing the elastomer closer to the frontal face decreases maximum load and energy absorption capacity.