| Title: | High strain rate hardening of metallic cellular metamaterials |
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| Authors: | ID Novak, Nejc (Author)
ID Vesenjak, Matej (Author)
ID Ren, Zoran (Author) |
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| Files: |  s40870-024-00425-x.pdf (3,42 MB)
MD5: BCD6F85D72B2A47F6348644960CDA46D
 https://link.springer.com/article/10.1007/s40870-024-00425-x
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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: | Strain rate hardening caused by the changed deformation mode is a fascinating phenomenon in cellular metamaterials where the material’s stiffness and energy absorption capabilities increase as the strain rate increases. This unique behaviour is attributed to a combination of micro-inertia effects, base material’s strain rate hardening and inertia effects. At high strain rates, the metamaterial’s inertia influences its deformation response, which changes to shock mode. This work briefly presents the geometry and fabrication of different metallic metamaterials. Then, it evaluates their mechanical response at different strain rates, ranging from quasi-static to intermediate dynamic and shock, determined by experimental and computational investigation. The three deformation modes can be separated into two critical loading velocities, unique for each metamaterial, which are also presented and compared in this work for various metamaterials. The investigations show that the deformation mode change in metallic metamaterials depends on their porosity. The critical velocities separating the deformation modes decrease with increasing porosity, i.e., decreased density of the metamaterial results in reduced critical loading velocities. The shock deformation mode in cellular metamaterials is thus attainable at much lower loading velocities than in homogeneous (nonporous) materials. |
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| Keywords: | metamaterials, cellular structures, high strain rate, experimental testing, computational modelling, compression loading, mechanical properties |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Submitted for review: | 12.12.2023 |
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| Article acceptance date: | 06.05.2024 |
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| Publication date: | 20.05.2024 |
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| Publisher: | Springer Nature |
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| Year of publishing: | 2024 |
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| Number of pages: | 15 str. |
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| Numbering: | Vol. 10, iss. 2 |
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| PID: | 20.500.12556/DKUM-88753  |
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| UDC: | 539.2:620.1 |
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| ISSN on article: | 2199-7454 |
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| COBISS.SI-ID: | 196314371 |
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| DOI: | 10.1007/s40870-024-00425-x |
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| Publication date in DKUM: | 22.05.2024 |
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| Views: | 204 |
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| Downloads: | 12 |
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| Metadata: |    |
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| Categories: | Misc.
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