Analysis of additively manufactured (3D printed) dual-material auxetic structures under compression
| Autor: | Zafer Kazancı, Ross P.D. Johnston |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
0209 industrial biotechnology
Materials science Auxetics Additive Manufacturing Biomedical Engineering 3D printing 02 engineering and technology Industrial and Manufacturing Engineering chemistry.chemical_compound 020901 industrial engineering & automation Polylactic acid Honeycomb General Materials Science Composite material Engineering (miscellaneous) business.industry Compression Enery absorption Solver 021001 nanoscience & nanotechnology Compression (physics) Dual (category theory) 3D Printing chemistry Buckling Dual-material 0210 nano-technology business |
| Zdroj: | Johnston, R & Kazancı, Z 2021, ' Analysis of additively manufactured (3D printed) dual-material auxetic structures under compression ', Additive Manufacturing, vol. 38, 101783 . https://doi.org/10.1016/j.addma.2020.101783 |
| DOI: | 10.1016/j.addma.2020.101783 |
| Popis: | Auxetic cellular structures offer improvements in some mechanical properties due to their negative Poisson’s ratio response when loaded. This study investigates and compares the effect of using multiple materials within three well researched cellular geometries, two auxetic: re-entrant and anti- tetrachiral, and one non-auxetic: hexagonal honeycomb. For each geometry, three different material configurations were used, a single material PLA structure and two dual-material structures: Polylactic Acid (PLA)–Nylon and PLA–Thermoplastic Polyurethane (TPU). A numerical model was developed to simulate these complex multi-material cellular geometries under a quasi-static compression load using Abaqus Explicit solver. To validate this numerical model, samples were additively manufactured and experimentally tested. They were found to show good correlation for the PLA and PLA-TPU. This study found that for situations where single loading cycles were required, for example, for crashworthy structures, the single material structures offered the highest performance where they absorbed the largest amount of energy. If multiple loading cycles are required, the multi-material structures offer the best solution due to the compression occurring through elastic buckling in comparison to plastic buckling in the single material. It was also found that through introducing materials with varying stiffnesses into specific regions within the structure, the Poisson’s ratio through the compression could be modified for the re-entrant and honeycomb geometries. |
| Databáze: | OpenAIRE |
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