Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 51 1 2019 04 21 Experimental Study of Energy Absorption of Square Column under Multi-Indentation Loading Experimental Study of Energy Absorption of Square Column under Multi-Indentation Loading 33 42 2712 10.22060/mej.2017.13274.5589 FA J. Rouzegar Department of Mechanical and Aerospace Engineering, Shiraz university of Technology, Shiraz, Iran M. R. Keshavarz Department of Mechanical and Aerospace Engineering, Shiraz university of Technology, Shiraz, Iran H. Assaee Department of Mechanical and Aerospace Engineering, Shiraz university of Technology, Shiraz, Iran Journal Article 2017 08 14 This research deals with experimental investigation on energy absorption and deformation of thin walled square columns under multi-indentation loading. The main goal of this research is to examine the effect of number and diameter of indenters and distance between them on the energy absorption parameters. First, square aluminum specimens with specific lengths were prepared and also an adjustable fixture for applying multi-indentation loading was fabricated. Then the indentation loading were applied on the specimens during a quasi-static condition with a constant loading rate. During loadings, the specimens were located between an almost rigid platen and the adjustable indenters. The load-displacement diagrams of specimens were obtained and the energy absorption parameters were calculated. The results indicate that the amount of absorbed energy in multi-indentation process increases significantly respect to single-indentation. By increasing the distance between indenters in multi-indentation loading, the load- displacement diagram shifts upward and moves toward the twice of single-indentation diagram. Also, by increment of diameter of indenters and distance between them, the amount of absorbed energy increases 20-60% due to formation of bigger plastic hinges. This research deals with experimental investigation on energy absorption and deformation of thin walled square columns under multi-indentation loading. The main goal of this research is to examine the effect of number and diameter of indenters and distance between them on the energy absorption parameters. First, square aluminum specimens with specific lengths were prepared and also an adjustable fixture for applying multi-indentation loading was fabricated. Then the indentation loading were applied on the specimens during a quasi-static condition with a constant loading rate. During loadings, the specimens were located between an almost rigid platen and the adjustable indenters. The load-displacement diagrams of specimens were obtained and the energy absorption parameters were calculated. The results indicate that the amount of absorbed energy in multi-indentation process increases significantly respect to single-indentation. By increasing the distance between indenters in multi-indentation loading, the load- displacement diagram shifts upward and moves toward the twice of single-indentation diagram. Also, by increment of diameter of indenters and distance between them, the amount of absorbed energy increases 20-60% due to formation of bigger plastic hinges. https://mej.aut.ac.ir/article_2712_bbeb0c1b1fd44e392c7ce2fdbd137e87.pdf