The Beneficial Effect of a TPMS-Based Fillet Shape on the Mechanical Strength of Metal Cubic Lattice Structures
The goal of this paper is to improve the mechanical strength-to-weight ratios of metal cubic lattice structures using unit cells with fillet shapes inspired by triply periodic minimal surfaces (TPMS). The lattice structures here presented were fabricated from AA6082 aluminum alloy using lost-PLA pro...
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| Format: | Article |
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MDPI AG
2024-03-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/17/7/1553 |
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| author | Christian Iandiorio Gianmarco Mattei Emanuele Marotta Girolamo Costanza Maria Elisa Tata Pietro Salvini |
| author_facet | Christian Iandiorio Gianmarco Mattei Emanuele Marotta Girolamo Costanza Maria Elisa Tata Pietro Salvini |
| author_sort | Christian Iandiorio |
| collection | DOAJ |
| description | The goal of this paper is to improve the mechanical strength-to-weight ratios of metal cubic lattice structures using unit cells with fillet shapes inspired by triply periodic minimal surfaces (TPMS). The lattice structures here presented were fabricated from AA6082 aluminum alloy using lost-PLA processing. Static and dynamic flat and wedge compression tests were conducted on samples with varying fillet shapes and fill factors. Finite element method simulations followed the static tests to compare numerical predictions with experimental outcomes, revealing a good agreement. The TPSM-type fillet shape induces a triaxial stress state that significantly improves the mechanical strength-to-weight ratio compared to fillet radius-free lattices, which was also confirmed by analytical considerations. Dynamic tests exhibited high resistance to flat impacts, while wedge impacts, involving a high concentrated-load, brought out an increased sensitivity to strain rates with a short plastic deformation followed by abrupt fragmentation, indicating a shift towards brittle behavior. |
| first_indexed | 2024-04-24T10:40:27Z |
| format | Article |
| id | doaj.art-b7c32421082649db84f6e84016d20d29 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-04-24T10:40:27Z |
| publishDate | 2024-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-b7c32421082649db84f6e84016d20d292024-04-12T13:21:58ZengMDPI AGMaterials1996-19442024-03-01177155310.3390/ma17071553The Beneficial Effect of a TPMS-Based Fillet Shape on the Mechanical Strength of Metal Cubic Lattice StructuresChristian Iandiorio0Gianmarco Mattei1Emanuele Marotta2Girolamo Costanza3Maria Elisa Tata4Pietro Salvini5Department of Enterprise Engineering, University of Rome “Tor Vergata”, Via del Politecnico 1, 00133 Rome, ItalyDepartment of Industrial Engineering, University of Rome “Tor Vergata”, Via del Politecnico 1, 00133 Rome, ItalyDepartment of Enterprise Engineering, University of Rome “Tor Vergata”, Via del Politecnico 1, 00133 Rome, ItalyDepartment of Industrial Engineering, University of Rome “Tor Vergata”, Via del Politecnico 1, 00133 Rome, ItalyDepartment of Industrial Engineering, University of Rome “Tor Vergata”, Via del Politecnico 1, 00133 Rome, ItalyDepartment of Enterprise Engineering, University of Rome “Tor Vergata”, Via del Politecnico 1, 00133 Rome, ItalyThe goal of this paper is to improve the mechanical strength-to-weight ratios of metal cubic lattice structures using unit cells with fillet shapes inspired by triply periodic minimal surfaces (TPMS). The lattice structures here presented were fabricated from AA6082 aluminum alloy using lost-PLA processing. Static and dynamic flat and wedge compression tests were conducted on samples with varying fillet shapes and fill factors. Finite element method simulations followed the static tests to compare numerical predictions with experimental outcomes, revealing a good agreement. The TPSM-type fillet shape induces a triaxial stress state that significantly improves the mechanical strength-to-weight ratio compared to fillet radius-free lattices, which was also confirmed by analytical considerations. Dynamic tests exhibited high resistance to flat impacts, while wedge impacts, involving a high concentrated-load, brought out an increased sensitivity to strain rates with a short plastic deformation followed by abrupt fragmentation, indicating a shift towards brittle behavior.https://www.mdpi.com/1996-1944/17/7/1553metal cubic lattice structurestriply periodic minimal surfaces (TPMS)lost-PLA castingmechanical strength of lattice structuresfinite element analysisexperimental tests |
| spellingShingle | Christian Iandiorio Gianmarco Mattei Emanuele Marotta Girolamo Costanza Maria Elisa Tata Pietro Salvini The Beneficial Effect of a TPMS-Based Fillet Shape on the Mechanical Strength of Metal Cubic Lattice Structures Materials metal cubic lattice structures triply periodic minimal surfaces (TPMS) lost-PLA casting mechanical strength of lattice structures finite element analysis experimental tests |
| title | The Beneficial Effect of a TPMS-Based Fillet Shape on the Mechanical Strength of Metal Cubic Lattice Structures |
| title_full | The Beneficial Effect of a TPMS-Based Fillet Shape on the Mechanical Strength of Metal Cubic Lattice Structures |
| title_fullStr | The Beneficial Effect of a TPMS-Based Fillet Shape on the Mechanical Strength of Metal Cubic Lattice Structures |
| title_full_unstemmed | The Beneficial Effect of a TPMS-Based Fillet Shape on the Mechanical Strength of Metal Cubic Lattice Structures |
| title_short | The Beneficial Effect of a TPMS-Based Fillet Shape on the Mechanical Strength of Metal Cubic Lattice Structures |
| title_sort | beneficial effect of a tpms based fillet shape on the mechanical strength of metal cubic lattice structures |
| topic | metal cubic lattice structures triply periodic minimal surfaces (TPMS) lost-PLA casting mechanical strength of lattice structures finite element analysis experimental tests |
| url | https://www.mdpi.com/1996-1944/17/7/1553 |
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