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High strain rate mechanical behaviour of uniform and hybrid metallic TPMS cellular structures
https://orcid.org/0000-0001-8263-9753
https://orcid.org/0000-0003-4175-7029
https://orcid.org/0000-0002-1656-9379
https://orcid.org/0000-0001-8626-5816
https://orcid.org/0000-0003-1327-7730
https://orcid.org/0000-0002-8665-5221
Abstract Four different geometries of uniform triply periodic minimal surface (TPMS) cellular structures (Diamond, Gyroid, IWP, and Primitive) and a hybrid Gyroid–Diamond TPMS structure were fabricated and experimentally tested under different compressive strain rates ranging from quasi-static (at 0.005 s−1) to very high strain rates (at 11,000 s−1). Three different testing apparatuses were used: a universal servo-hydraulic testing machine, a direct impact Hopkinson bar (DIHB), and a powder gun. Limited strain rate hardening was observed at quasi-static, low- and intermediate-dynamic deformation, while the shock deformation mode showed significant strain rate hardening of all tested structures. The computational models were developed and validated with the experimental results and then used to predict the TPMS structure’s behaviour even at higher strain rates (up to 35,000 s−1), not attainable by used experimental devices. The Diamond and IWP structures exhibited up to five times higher (an increase from 6.9 to 40.8 J/g) specific energy absorption (SEA) during very high strain rate loading than during the quasi-static and lower dynamic testing. The tests of hybrid samples showed that the sample orientation significantly affects the mechanical high strain rate response, which can be either progressive (less stiff structure at sample impact end) or regressive (stiffer structure at sample impact end).
Highlights The sheet-based TPMS metamaterials were fabricated using the powder bed fusion technique with 4 uniform and 1 hybrid geometry. The deformation behaviour and mechanical properties were experimentally evaluated using compression testing at 4 different strain rates. The values of plateau stress, SEA and CFE were calculated to evaluate the strain rate hardening behaviour. The results were used for the validation of computational models, which were used to predict behaviour at different strain rates.
High strain rate mechanical behaviour of uniform and hybrid metallic TPMS cellular structures
https://orcid.org/0000-0001-8263-9753
https://orcid.org/0000-0003-4175-7029
https://orcid.org/0000-0002-1656-9379
https://orcid.org/0000-0001-8626-5816
https://orcid.org/0000-0003-1327-7730
https://orcid.org/0000-0002-8665-5221
Abstract Four different geometries of uniform triply periodic minimal surface (TPMS) cellular structures (Diamond, Gyroid, IWP, and Primitive) and a hybrid Gyroid–Diamond TPMS structure were fabricated and experimentally tested under different compressive strain rates ranging from quasi-static (at 0.005 s−1) to very high strain rates (at 11,000 s−1). Three different testing apparatuses were used: a universal servo-hydraulic testing machine, a direct impact Hopkinson bar (DIHB), and a powder gun. Limited strain rate hardening was observed at quasi-static, low- and intermediate-dynamic deformation, while the shock deformation mode showed significant strain rate hardening of all tested structures. The computational models were developed and validated with the experimental results and then used to predict the TPMS structure’s behaviour even at higher strain rates (up to 35,000 s−1), not attainable by used experimental devices. The Diamond and IWP structures exhibited up to five times higher (an increase from 6.9 to 40.8 J/g) specific energy absorption (SEA) during very high strain rate loading than during the quasi-static and lower dynamic testing. The tests of hybrid samples showed that the sample orientation significantly affects the mechanical high strain rate response, which can be either progressive (less stiff structure at sample impact end) or regressive (stiffer structure at sample impact end).
Highlights The sheet-based TPMS metamaterials were fabricated using the powder bed fusion technique with 4 uniform and 1 hybrid geometry. The deformation behaviour and mechanical properties were experimentally evaluated using compression testing at 4 different strain rates. The values of plateau stress, SEA and CFE were calculated to evaluate the strain rate hardening behaviour. The results were used for the validation of computational models, which were used to predict behaviour at different strain rates.
High strain rate mechanical behaviour of uniform and hybrid metallic TPMS cellular structures
https://orcid.org/0000-0001-8263-9753
https://orcid.org/0000-0003-4175-7029
https://orcid.org/0000-0002-1656-9379
https://orcid.org/0000-0001-8626-5816
https://orcid.org/0000-0003-1327-7730
https://orcid.org/0000-0002-8665-5221
Abstract Four different geometries of uniform triply periodic minimal surface (TPMS) cellular structures (Diamond, Gyroid, IWP, and Primitive) and a hybrid Gyroid–Diamond TPMS structure were fabricated and experimentally tested under different compressive strain rates ranging from quasi-static (at 0.005 s−1) to very high strain rates (at 11,000 s−1). Three different testing apparatuses were used: a universal servo-hydraulic testing machine, a direct impact Hopkinson bar (DIHB), and a powder gun. Limited strain rate hardening was observed at quasi-static, low- and intermediate-dynamic deformation, while the shock deformation mode showed significant strain rate hardening of all tested structures. The computational models were developed and validated with the experimental results and then used to predict the TPMS structure’s behaviour even at higher strain rates (up to 35,000 s−1), not attainable by used experimental devices. The Diamond and IWP structures exhibited up to five times higher (an increase from 6.9 to 40.8 J/g) specific energy absorption (SEA) during very high strain rate loading than during the quasi-static and lower dynamic testing. The tests of hybrid samples showed that the sample orientation significantly affects the mechanical high strain rate response, which can be either progressive (less stiff structure at sample impact end) or regressive (stiffer structure at sample impact end).
Highlights The sheet-based TPMS metamaterials were fabricated using the powder bed fusion technique with 4 uniform and 1 hybrid geometry. The deformation behaviour and mechanical properties were experimentally evaluated using compression testing at 4 different strain rates. The values of plateau stress, SEA and CFE were calculated to evaluate the strain rate hardening behaviour. The results were used for the validation of computational models, which were used to predict behaviour at different strain rates.
High strain rate mechanical behaviour of uniform and hybrid metallic TPMS cellular structures
Novak, Nejc (Autor:in) / Tanaka, Shigeru (Autor:in) / Hokamoto, Kazuyuki (Autor:in) / Mauko, Anja (Autor:in) / Yilmaz, Yunus Emre (Autor:in) / Al-Ketan, Oraib (Autor:in) / Vesenjak, Matej (Autor:in) / Ren, Zoran (Autor:in)
Thin-Walled Structures ; 191
10.08.2023
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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