Study and characterization of mechanical properties of wood-PLA composite (Timberfill) material parts built through fused filament fabrication
This research is based upon the additive manufacturing (AM) technology which aims to study the mechanical properties of innovative commercial wood-PLA composite material (Timberfill) and characterize its behavior. Specifically fatigue, tensile, and flexural tests are performed and the results are ev...
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| Tipo de recurso: | tesis doctoral |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/329286 |
| Acceso en línea: | https://hdl.handle.net/2117/329286 https://dx.doi.org/10.5821/dissertation-2117-329286 |
| Access Level: | acceso abierto |
| Palabra clave: | Additive manufacturing Fused filament fabrication Timberfill Mechanical behavior Wood-PLA Finite element model (FEM) Àrees temàtiques de la UPC::Enginyeria mecànica |
| Sumario: | This research is based upon the additive manufacturing (AM) technology which aims to study the mechanical properties of innovative commercial wood-PLA composite material (Timberfill) and characterize its behavior. Specifically fatigue, tensile, and flexural tests are performed and the results are evaluated to conclude this issue. To manufacture the experimental samples one of the most common techniques named fused filament fabrication (FFF) is applied, consequently the influence of manufacturing parameters on the mechanical properties have been considered. For this reason some of the most influential printing parameters in different levels are selected and have been combined together to manufacture the samples in a wide range of building conditions. To avoid manufacturing a large number of specimens, a design of experiments (DoE) through Taguchi orthogonal arrays is designed and the influence of the factors have been analyzed performing an analysis of variance (ANOVA). As a conclusion the optimal combination of the parameters and levels have been obtained for each one of the applied mechanical tests and higher values of responses have been derived from these set of parameters. Since the above mentioned material is composite of wood fibers with PLA, all of the obtained results are compared to the pure PLA to find the effectiveness of this composition. In the other side tensile and flexural tests have been applied on solid Timberfill specimens manufactured through injection molding to investigate the differences between this technology and additive manufacturing. These investigations resulted that mechanical resistances of the printed samples were lower than injected ones which the solidity percentage could be main reason of this effect. Additionally the flexural strength of the material have been simulated and compare to the experimental results. The achieved deformation behavior curves validate the experimental test and that would be one of the main conclusions of this research. |
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