A Hollowing Topology Optimization Method for Additive and Traditional Manufacturing Technologies

Barberi, Emmanuele; Cucinotta, Filippo; Raffaele, Marcello; Salmeri, Fabio

doi:10.1007/978-3-030-91234-5_43

Cited by 9 publications

(6 citation statements)

References 18 publications

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“…A Bell-Metha convergent profile was utilized with the aim of reducing turbulence, similar to the convergent profiles used in wind tunnels as described in [11,12]. The turbine used in this study is a small size Savonius-type turbine, manufactured using the Additive Manufacturing method made of PLA [13,14]. The turbine has a diameter of 90 mm and a height of 90 mm, while the overlap ratio is 1/3.…”

Section: Methodsmentioning

confidence: 99%

Bell-Metha Power Augmented Savonius turbine as Take-off in OWC Systems

Brusca,

Galvagno,

Mauro

et al. 2023

J. Phys.: Conf. Ser.

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The present paper deals with the study of ducted Savonius turbine performance to be used as power take-off in oscillating water column systems equipped with a power booster. Two converging sections with a Bell-Metha profile have been used to increase the mass flow rate on the active side of the turbine while masking the resistant part. The Bell-Metha profile was chosen with the aim of reducing vortices immediately upstream of the turbine, avoiding both disturbance and energy loss. A laboratory scale Savonius turbine with a diameter of 0.09 m with an aspect ratio of 1 and an overlap ratio of 1/3 was tested. Performance was tested using a laboratory scale oscillating flow simulator. All tests were performed at fixed air velocity of 5 m/s. Based on the results, it is possible to state that ducted turbine with power augmenter performance is higher than plain ducted turbine ones, at all tip speed ratios.

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Section: Methodsmentioning

confidence: 99%

Bell-Metha Power Augmented Savonius turbine as Take-off in OWC Systems

Brusca,

Galvagno,

Mauro

et al. 2023

J. Phys.: Conf. Ser.

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“…[1,2] Additive manufacturing enables advanced topology optimization, creating lightweight, highperformance components while retaining the required mechanical strength. [3,4] Particularly, additive manufacturing processes can be considered an evolution into the field of the rapid prototyping, which was developed more than 30 years ago with the purpose to produce non-structural parts to promote the phases of industrial design. [5] For example, General Electric has innovatively used this technology in creating titanium fuel nozzles for aircraft engines, resulting in substantial durability improvements, weight reduction, and more efficient production processes.…”

Section: Introductionmentioning

confidence: 99%

“…[ 1,2 ] Additive manufacturing enables advanced topology optimization, creating lightweight, high‐performance components while retaining the required mechanical strength. [ 3,4 ] Particularly, additive manufacturing processes can be considered an evolution into the field of the rapid prototyping, which was developed more than 30 years ago with the purpose to produce non‐structural parts to promote the phases of industrial design. [ 5 ]…”

Section: Introductionmentioning

confidence: 99%

A Design Strategy for Removing the Debinding and Sintering Gas in Additive Manufactured Samples of a Bronze/Polylactic Acid Filament

Cucinotta,

Di Bella,

Raffaele

et al. 2024

Adv Eng Mater

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To lower the cost of additive manufacturing of metallic components, the goal of this work is to investigate and optimise a multi‐step process by material extrusion (MEX) of a polylactide filament loaded with bronze to remove the gas produced during the debinding and sintering steps. First, by adjusting the infill (10%, 50%, and 100%), and then by designing and constructing internal passages to aid in the expulsion of gases that occur during the debinding, a calibration cube was created. Additionally, the impact of the cooling period during the debinding was examined. To assess how the technique changes shape, sizes, and internal structure, all the samples were ultimately weighed, scanned, and cut. In order to reduce deformation occurred during the debinding and sintering gases, a new design method has been developed. The method consists of the generation of internal channels which connect the voids of the infill and allow gases to flow out through a central channel. As seen, samples with ejection channels and an intermediate infill (i.e., 50%) both exhibit better attributes.This article is protected by copyright. All rights reserved.

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“…It is a simple concept of additive manufacturing (AM) that is free from hazardous chemicals [ 1 ], and allows for the safe fabrication of complex and elegant structures in a tabletop environment. This method is also recognised for its negligible waste generation, low production cost [ 2 ], and ability to deliver materials with a higher stress/weight ratio [ 3 ]. Over the years, MEX has been adopted in numerous sectors, including composites [ 4 ], scaffolds [ 5 ], energy harvesting [ 6 ], pharmaceuticals [ 7 ], and home applications [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Material Extrusion of Wool Waste/Polycaprolactone with Improved Tensile Strength and Biodegradation

Haque,

Naebe

2023

Polymers

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Additive manufacturing (AM) through material extrusion (MEX) is becoming increasingly popular worldwide due to its simple, sustainable and safe technique of material preparation, with minimal waste generation. This user-friendly technique is currently extensively used in diverse industries and household applications. Recently, there has been increasing attention on polycaprolactone (PCL)-based composites in MEX due to their improved biodegradability. These composites can be printed at a lower temperature, making them more energy efficient compared to commercial filaments such as acrylonitrile butadiene styrene (ABS) and polylactic acid (PLA). Although wool is the leading protein fibre in the world and can be more compatible with PCL due to its inherent hydrophobicity, the suitability of MEX using a wool/PCL combination has not been reported previously. In the current study, waste wool/PCL composite parts were printed using the MEX technique, and rheology, thermal and tensile properties, and morphology were analysed. The impact of wool loading (10% and 20%) was investigated in relation to different filling patterns (concentric, rectilinear and gyroid). Furthermore, the impact of fibre fineness on the final material produced through MEX was investigated for the first time using two types of wool fibres with diameters of 16 µm and 24 µm. The yield strength and modulus of PCL increased with the inclusion of 10% wool, although the elongation was reduced. The crystallinity of the composites was found to be reduced with wool inclusion, though the melting point of PCL remained mostly unchanged with 10% wool inclusion, indicating better compatibility. Good miscibility and uniform structure were observed with the inclusion of 10% wool, as evidenced by rheology and morphology analysis. The impact of fibre fineness was mostly minor, though wool/PCL composites showed improved thermal stability with finer diameter of wool fibres. The printed specimens exhibited an increasing rate of biodegradation in marine water, which was correlated to the amount of wool present. Overall, the results demonstrate the practical applicability of the wool/PCL composition in MEX for the preparation of varied objects, such as containers, toys and other household and industrial items. Using wool/PCL combinations as regular plastics would provide a significant environmental advantage over the non-degradable polymers that are currently used for these purposes.

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A Hollowing Topology Optimization Method for Additive and Traditional Manufacturing Technologies

Cited by 9 publications

References 18 publications

Bell-Metha Power Augmented Savonius turbine as Take-off in OWC Systems

Bell-Metha Power Augmented Savonius turbine as Take-off in OWC Systems

A Design Strategy for Removing the Debinding and Sintering Gas in Additive Manufactured Samples of a Bronze/Polylactic Acid Filament

Material Extrusion of Wool Waste/Polycaprolactone with Improved Tensile Strength and Biodegradation

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