Effect of multiple holes on dynamic buckling of stubby shells: An experimental and numerical investigation

• Multiple holes in a single row triggered buckling at the location of the holes.
• Larger number of smaller diameter holes is more effective for peak load reduction.
• Effectiveness of a second row of holes depends on diameter and spacing of holes.
• Holes reduced the peak load without decreasing energy efficiency of the cylinder.

Current study investigates the deformation behavior and energy absorption of thin walled cylinders having multiple holes when subjected to dynamic compressive loading. A split-Hopkinson pressure bar (SHPB) was utilized for obtaining short duration dynamic loading. A SIM02-16 high speed camera was employed to capture the real time images of the deformation process. Holes of different diameters were arranged in different geometric configurations along the length of the cylinders. The effect of holes and their arrangement on peak load reduction and energy absorption characteristics of the cylinders was investigated. From the experimental study, it was observed that the diameter of the holes, their spacing, and pattern of arrangement, all have a strong influence on the peak load transmitted by the cylinders and also on the deformation pattern. Larger number of smaller diameter holes resulted in higher peak load reduction. Subsequently a numerical analysis was carried out using the commercially available finite element package Abaqus Explicit 6.11. The results of the analysis revealed that both the level of stress concentration induced by the holes and the interaction of stresses between adjacent holes have a role to play in reducing the peak load through controlling the deformation.