COMPARATİVE COMPRESSİON BEHAVİOR OF FDM-PRİNTED PLA TPMS STRUCTURES: GYROİD, NEOVİUS, AND PMY

This study experimentally evaluates the compressive response of Triply Periodic Minimal Surface(TPMS) lattice structures (Gyroid, Neovius, and PMY) fabricated from PLA by Fused Deposition Modeling(FDM). Samples were created in the MS-Lattice model with 5 mm cell size and 0.30 pore density, printedvertically at 220 °C nozzle and 65 °C bed temperatures, and fabricated at 30% nominal relative density.Cylindrical specimens (12 mm diameter × 25 mm height) were tested quasi-statically on the Reagen universaltesting machine at a speed of 1 mm/min, with compression limited to a displacement of 4 mm. Experimentalresults show clear topology-dependent behavior: Gyroid reached the highest peak contact force (~400 N),Neovius reached ~330 N, and PMY reached ~220 N. The force-displacement traces exhibit oscillatorycharacteristics consistent with gradual, layer-by-layer collapse in Gyroid and more abrupt load drops in Neoviusand PMY, suggesting different collapse mechanisms despite the same relative density. The findings indicatethat not only relative density but also geometric topology dominantly controls the load-carrying capacity andenergy absorption in FDM-fabricated TPMS lattices. These results provide experimental implications for theselection of TPMS geometries for lightweight, energy-absorbing applications.