en سازه Body structure پژوهشي Research <span lang="EN-GB" style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">This study examines how different porosity levels and perforation patterns affect the crushing performance of thin-walled cylindrical tubes under axial loading. Nonlinear explicit finite element simulations, validated by experiments, were performed on tubes with varying porosity ratios to assess deformation modes, peak crushing forces, and energy absorption efficiencies. The study&#39;s results indicate that perforated tubes have better energy absorption characteristics than non-perforated tubes, with a 7.83% improvement in the Specific Energy Absorption (SEA) value. The straight-type tube demonstrated a 1.75% higher Specific Energy Absorption (SEA) and 1.23% greater total energy absorption compared to the staggered arrangement. These findings suggest the effectiveness of the straight-type design for load-bearing and energy dissipation. This research offers insights into optimizing energy-absorbing structures for impact mitigation, suggesting that the straight-type configuration may be better when structural integrity and energy absorption are crucial.</span></span></span> Perforated Cylindrical Thin-walled Tubes, Energy Absorption, Quasi-static axial Compression Test, Staggered vs. Straight Perforation Patterns, Porosity, Crashworthiness, Explicit Dynamics, Finite Element Analysis 4765 4783 http://ase.iust.ac.ir/browse.php?a_code=A-10-842-1&slc_lang=en&sid=1 Ehsan Hoseinpour ehsanhoseinpour@stu.nit.ac.ir 180031947532846005118 180031947532846005118 No Babol Noshirvani University of Technology Ali Moazemi Goudarzi goudarzi@nit.ac.ir 180031947532846005119 180031947532846005119 Yes Babol Noshirvani University of Technology Fattaneh Morshedsolouk f.morshed@nit.ac.ir 180031947532846005120 180031947532846005120 No Babol Noshirvani University of Technology Hussain Gharehbaghi h.gharehbaghi@modares.ac.ir 180031947532846005121 180031947532846005121 No Tarbiat Modares University