Publicação
Additive Fabrication of Metallic Anepectic meshes
| Resumo: | Taking advantage of additive manufacturing capabilities, a two-dimensional re-entrant star-shaped metal structure was successfully fabricated. Seeking to achieve anepectic behaviour, as it can only be attained when the two constituent materials have similar but different stiffness values and widely different CTE, two materials were selected, namely Inconel 625 and AlSi10Mg. A parameter optimization was performed for the equipment and the selected materials. Using these parameters, two different types of single material meshes, with a thickness of 1mm and 0.5mm respectively, were printed and mechanically tested, successfully exhibiting auxetic behaviour, proving that natural auxeticity can also be achieved with metallic meshes. With a view to also achieve the anepectic behaviour, the compatibility and interconnection of the selected materials were also studied, using for that purpose printed bimetallic meshes. Recurring to optical microscopy and scanning electron microscopy, the interface between the two materials was studied. When the printing process started by AlSi10Mg followed by Inconel 625 interesting results were obtained as it exhibited an small interdiffusion area, however further studies are recommended. In order to analyse the possibility to achieve anepectic behaviour in metallic meshes, more studies are necessary. |
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| Autores principais: | Duarte, Mariana Monteiro |
| Assunto: | Anepectic Auxetic Negative coefficient of thermal expansion Negative Poisson's ratio Additive manufacturing Metallic structures |
| Ano: | 2022 |
| País: | Portugal |
| Tipo de documento: | dissertação de mestrado |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Universidade Nova de Lisboa |
| Idioma: | inglês |
| Origem: | Repositório Institucional da UNL |
| Resumo: | Taking advantage of additive manufacturing capabilities, a two-dimensional re-entrant star-shaped metal structure was successfully fabricated. Seeking to achieve anepectic behaviour, as it can only be attained when the two constituent materials have similar but different stiffness values and widely different CTE, two materials were selected, namely Inconel 625 and AlSi10Mg. A parameter optimization was performed for the equipment and the selected materials. Using these parameters, two different types of single material meshes, with a thickness of 1mm and 0.5mm respectively, were printed and mechanically tested, successfully exhibiting auxetic behaviour, proving that natural auxeticity can also be achieved with metallic meshes. With a view to also achieve the anepectic behaviour, the compatibility and interconnection of the selected materials were also studied, using for that purpose printed bimetallic meshes. Recurring to optical microscopy and scanning electron microscopy, the interface between the two materials was studied. When the printing process started by AlSi10Mg followed by Inconel 625 interesting results were obtained as it exhibited an small interdiffusion area, however further studies are recommended. In order to analyse the possibility to achieve anepectic behaviour in metallic meshes, more studies are necessary. |
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