20.500.12556/DKUM-88748 Mechanical behaviour of photopolymer cell-size graded triply periodic minimal surface structures at different deformation rates This study investigates how varying cell size affects the mechanical behaviour of photopolymer Triply Periodic Minimal Surfaces (TPMS) under different deformation rates. Diamond, Gyroid, and Primitive TPMS structures with spatially graded cell sizes were tested. Quasi-static experiments measured boundary forces, representing material behaviour, inertia, and deformation mechanisms. Separate studies explored the base material’s behaviour and its response to strain rate, revealing a strength increase with rising strain rate. Ten compression tests identified a critical strain rate of 0.7 s−1 for “Grey Pro” material, indicating a shift in failure susceptibility. X-ray tomography, camera recording, and image correlation techniques observed cell connectivity and non-uniform deformation in TPMS structures. Regions exceeding the critical rate fractured earlier. In Primitive structures, stiffness differences caused collapse after densification of smaller cells at lower rates. The study found increasing collapse initiation stress, plateau stress, densification strain, and specific energy absorption with higher deformation rates below the critical rate for all TPMS structures. However, cell-size graded Primitive structures showed a significant reduction in plateau and specific energy absorption at a 500 mm/min rate. cellular materials triply periodical minimal surface photopolymer mechanical properties strain rate experimental compressive testing computer simulations celični materiali trikratna periodična minimalna površina fotopolimer mehanske lastnosti hitrost deformacije eksperimentalno tlačno testiranje računalniške simulacije true false true MDPI Angleški jezik Slovenski jezik https://www.mdpi.com/journal/materials © 2024 by the authors Članek v reviji 2024-05-22 14:14:49 2024-05-22 14:14:50 2026-01-28 08:26:14 0000-00-00 00:00:00 2024 0 0 20 str. iss. 10, [article no.] 2318 Vol. 17 May 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2024-04-19 2024-05-11 2024-05-14 539.2:20.1 196300291 10.3390/ma17102318 1996-1944 materials-17-02318.pdf materials-17-02318.pdf 1 3C2C52EFF788B358F00D195DB783FF36 5e02015f68da823903dde475885b2e819a7eba1648f648e0d19b2cd4b5abb95e 7febea98-1835-11ef-8ccf-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=179618 https://www.mdpi.com/1996-1944/17/10/2318 0 8c67218c-1835-11ef-8ccf-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=179619 Fakulteta za strojništvo 0 0 0