Collapse Behavior and Energy Absorbing Characteristics of 3D-Printed Tubes with Different Infill Pattern Structures: An Experimental Study

Abstract This work investigates the impact of infill pattern structure on crashworthy performance and deformation history 3D-printed tubes subjected to a quasi-static axial compression load. The proposed were made from polylactic acid (PLA) using 3D printing technique. Five structures adapted, i.e. circular, square, triangle, zigzag cross patterns with 50% density. analysis was carried out by assessing different indicators, peak force ( $${\mathrm{F}}_{\mathrm{ip}})$$ F ip ) , mean crush $${\mathrm{F}}_{\mathrm{m}})$$ m total absorbed energy (U), specific (SEA), crushing efficiency (CFE). It found that square shows maximum $${\mathrm{F}}_{\mathrm{ip}}$$ $${\mathrm{F}}_{\mathrm{m}}$$ U SEA values (24.38 kN, 20.58 673.38 kJ, 26.52) while highest CFE value 0.91. optimal is determined Multi-Attribute Decision Making (MADM) method called Complex Proportional Assessment (COPRAS). COPRAS results showed most effective absorbing structure.