| Title: | Image-modulated implicit-field design of graded re-entrant triply periodical minimal surface with stabilised auxetic response |
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| Authors: | ID Novak, Nejc (Author)
ID Al-Ketan, Oraib (Author)
ID Grebo, Alen (Author)
ID Krstulović-Opara, Lovre (Author)
ID Borovinšek, Matej (Author)
ID Ren, Zoran (Author)
ID Vesenjak, Matej (Author) |
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| Files: |  https://onlinelibrary.wiley.com/doi/10.1002/pssb.70249
 Physica_Status_Solidi_B.pdf (3,90 MB)
MD5: B88F5FC29816695E00612E189EBEFFF6
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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 examines the quasi-static compressive response of functionally graded auxetic triply periodic minimal surface (AUXTPMS) metamaterials designed to stabilise negative Poisson’s ratio behaviour at large strains. The proposed concept combines a re-entrant auxetic deformation mechanism with an in-plane porosity gradient generated through an image-modulated implicit-field workflow and isosurface extraction. Polymer (PA2200) and metal (stainless steel and aluminium) were tested in uniaxial compression, and transverse deformation was quantified using video image analysis complemented by digital image correlation. In contrast to uniform-porosity counterparts that exhibited early localisation and out-of-plane instability, the graded architectures promoted stable, sequential crushing and maintained a negative Poisson’s ratio over an extended strain range, with the re-entrant 1 × 1 configuration showing the most sustained auxetic response. Mechanical response analysis indicated that porosity gradation did not provide a universal increase in peak strength or stiffness-to-weight ratio, but it consistently improved deformation stability by suppressing out-of-plane buckling. Follow-on testing of the selected 1 × 1 design in aluminium and stainless steel demonstrated material-dependent specific energy absorption, reaching 2.63 and 5.05 J/g, respectively. Overall, the results identify porosity gradation as a key stabilisation strategy for practical auxetic TPMS architectures, enabling predictable deformation paths relevant to lightweight energy-absorbing and impact-mitigation applications. |
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| Keywords: | auxetic, buckling, gradation, materials science, metamaterial, porosity, specific energy, transverse plane |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 30.12.2025 |
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| Article acceptance date: | 13.05.2026 |
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| Publication date: | 28.05.2026 |
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| Publisher: | Wiley |
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| Year of publishing: | 2026 |
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| Number of pages: | 12 str. |
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| Numbering: | Vol. 263, issue 5 |
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| PID: | 20.500.12556/DKUM-98251  |
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| UDC: | 539.2:004.92 |
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| ISSN on article: | 1521-3951 |
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| COBISS.SI-ID: | 279818243 |
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| DOI: | 10.1002/pssb.70249 |
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| Publication date in DKUM: | 29.05.2026 |
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| Views: | 189 |
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| Downloads: | 20 |
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| Metadata: |    |
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| Categories: | Misc.
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