| Title: | Mechanical behaviour of photopolymer cell-size graded triply periodic minimal surface structures at different deformation rates |
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| Authors: | ID Yilmaz, Yunus Emre (Author)
ID Novak, Nejc (Author)
ID Al-Ketan, Oraib (Author)
ID Irem Erten, Hacer (Author)
ID Yaman, Ulas (Author)
ID Mauko, Anja (Author)
ID Borovinšek, Matej (Author)
ID Ulbin, Miran (Author)
ID Vesenjak, Matej (Author)
ID Ren, Zoran (Author) |
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| Files: |  materials-17-02318.pdf (9,33 MB)
MD5: 3C2C52EFF788B358F00D195DB783FF36
 https://www.mdpi.com/1996-1944/17/10/2318
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| Language: | English |
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| Work type: | Article |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FS - Faculty of Mechanical Engineering
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| 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. |
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| Keywords: | cellular materials, triply periodical minimal surface, photopolymer, mechanical properties, strain rate, experimental compressive testing, computer simulations |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 07.05.2024 |
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| Article acceptance date: | 11.05.2024 |
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| Publication date: | 14.05.2024 |
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| Publisher: | MDPI |
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| Year of publishing: | 2024 |
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| Number of pages: | 20 str. |
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| Numbering: | Vol. 17, iss. 10, [article no.] 2318 |
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| PID: | 20.500.12556/DKUM-88748  |
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| UDC: | 539.2:20.1 |
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| ISSN on article: | 1996-1944 |
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| COBISS.SI-ID: | 196300291 |
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| DOI: | 10.3390/ma17102318 |
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| Publication date in DKUM: | 22.05.2024 |
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| Views: | 216 |
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| Downloads: | 15 |
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| Metadata: |    |
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| Categories: | Misc.
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