Yunus Emre Yilmaz (Author), Nejc Novak (Author), Oraib Al-Ketan (Author), Hacer Irem Erten (Author), Ulas Yaman (Author), Anja Mauko (Author), Matej Borovinšek (Author), Miran Ulbin (Author), Matej Vesenjak (Author), Zoran Ren (Author)

Abstract

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.

Keywords

celični materiali;trikratna periodična minimalna površina;fotopolimer;mehanske lastnosti;hitrost deformacije;eksperimentalno tlačno testiranje;računalniške simulacije;cellular materials;triply periodical minimal surface;photopolymer;mechanical properties;strain rate;experimental compressive testing;computer simulations;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FS - Faculty of Mechanical Engineering
Publisher: MDPI
UDC: 539.2:20.1
COBISS: 196300291 Link will open in a new window
ISSN: 1996-1944
Views: 29
Downloads: 3
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Other data

Secondary language: Slovenian
Secondary keywords: celični materiali;trikratna periodična minimalna površina;fotopolimer;mehanske lastnosti;hitrost deformacije;eksperimentalno tlačno testiranje;računalniške simulacije;
Type (COBISS): Article
Pages: 20 str.
Volume: ǂVol. ǂ17
Issue: ǂiss. ǂ10, [article no.] 2318
Chronology: May 2024
DOI: 10.3390/ma17102318
ID: 23751812