OICC Press Journal of Solid Mechanics 2008-7683 16 3 2024 10 12 Experimental and numerical investigation of the effect of wall perforation geometry on absorption of axial impact energy in thin-walled metal tubes 337 349 10.60664/jsm.2024.3091792 EN A Naddaf Oskouei Department of Solid Mechanics, Faculty of Mechanical Engineering, University of Eyvanekey, Garmsar, Iran Mojtaba Ghamarizadeh Mechanical group, ihu university Khodadad Vahedi Solid Mechanics Group, Mechanical Engineering Dept., Imam Hossein University, Tehran, Iran. R Hosseini Young Researchers and Elite Club, South Tehran Branch, Islamic Azad University, Tehran, Iran Ebrahim Salek Solid Mechanics Group, Mechanical Engineering Dept., Imam Hossein University, Tehran, Iran. Journal Article 2024 10 12 In this article, the experimental and numerical analysis of the effect of the geometry of the wall holes on the energy absorption of thin-walled tubes is discussed. Energy is applied by axial impact. Thin wall tubes, with and without side holes in the wall, are used to absorb the axial impact energy caused by a dropping weight. These tubes absorb the energy caused by the impact by asymmetric plastic buckling. If the force of the impacting object is greater than the minimum average buckling force, the tube will be dented and its length will decrease. The amount of tubes depression depends on the energy input to it, the geometric characteristics and the material of the tubes. In this paper, it is shown that by perforating the thin-walled tubes in different shapes, in order to absorb the same impact energy, the shortening length of the tubes increases. By increasing the shortening length of the tubes, the amount of initial force is reduced, and in other words, it is possible to control the force and reduce damage. There is a good agreement between experimental and simulation results.