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2 Journal of Achievements in Materials and Manufacturing Engineering

2 2012

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Alternate slicing and deposition strategies for fused deposition modelling of light curved parts

100%

Huang B. , Singamneni S.

Journal of Achievements in Materials and Manufacturing Engineering

2012

tom Vol. 55, nr 2

511--517

Fused deposition modeling (FDM), as one of the additive manufacturing (AM) techniques, has been widely used in the manufacturing industry from the 1990s. It is relatively cheaper than other AM methods and there are other advantages such as being able to process a variety of other polymers. Currently, FDM is more likely to be suitable for direct production of the terminal-use parts, in some cases challenging traditional process such as injection molding. Research evidences indicate that change of road and layer structure would have significant influence on the meso-structure and thus impact the mechanical properties of the resulting polymer parts. Adaptive flat layer deposition and curved layer deposition have been introduced to improve the mechanical properties of terminal-use product. It is necessary that an appropriate deposition scheme is essential to ensure the best interroad and inter-layer connectivity. Uninterrupted connections are likely to result in a continuous network of polymer chains, as in the case of the conventional processes. The current research proposes conventional flat layer deposition, adaptive flat layer deposition and curved layer deposition for FDM. In particular for curved parts, curved layer deposition in expected to ensure fiber continuity and better meso-structure. Mathematical models are developed for curved slicing, practically implemented to print physical parts and test results suggest marked improvement in the mechanical characteristics of curved parts.

Elastic metamaterials: some initial experiences with the Milton-Willis structure based on a rapid prototyped model and a numerical analysis

80%

Sutandie H. J. , Singamneni S. , Banerji B.

Journal of Achievements in Materials and Manufacturing Engineering

2012

tom Vol. 55, nr 2

584--589

Elastic metamaterials attract quite a bit of research attention of late. Theoretical models such as those proposed by Milton and Willis suggest possibility of physically realizing the structures leading to elastic metamaterials. The main stumbling block being the limitations of fabrication methods, considering the complex geometries and material requirements. Rapid prototyping and of-late rapid manufacturing offer solutions for the production of physical shapes of unlimited geometrical complexities direct from digital files, employing a variety of materials. Considering the requirements of metamaterial structures and the capabilities of rapid manufacturing, the need to bring these two together has been envisioned, and the experimental and numerical work presented in this paper is an initial step towards this goal.