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Browsing Mestrados da ESTG by Subject "3D printing"
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- 3D Printed Preforms for Manufacturing Flexible Cork CompositesPublication . Palmer, Jordan Richard Gordon; Simões, Fábio Jorge PereiraAs concerns around climate and carbon footprint are better understood, countries around the world are increasingly pricing carbon. Initiatives such as the Paris Accord are a good example. As pricing carbon becomes more important, within the context of the manufacturing industry, sustainable materials are going to be well positioned to out-perform traditional non-renewables. Recycled cork has the potential to serve as a substitute to current petroleum-based foams; and a more sustainable, lower carbon footprint alternative, at the same or similar cost. This thesis will discuss the need for a new approach to the mass production of cork polymer composite materials, and the potential for additive manufacturing techniques to satisfy this need and improve their performance, while also reducing their environmental impact. The proposed solution is a process for 3D printing cork preforms for compression molded TPE based cork polymer composites. This method will provide precise software-based density control, making it possible to fabricate highly flexible, lightweight composite parts without sacrificing durability.
- 3D Printing on a Large Scale for ConstructionPublication . Gomes, Ludmila Vago; Gaspar, Florindo José Mendes; Simões, Fábio Jorge Pereira
- Additive manufacturing of foamed structuresPublication . Mistry, Abhishek; Mateus, Artur Jorge dos Santos; Simões, Fábio Jorge PereiraThe major aim of this work was to develop an additive manufacturing method for obtaining foamed structures. There is limited research to understand the properties of the materials and the technology used to make foamed parts directly by additive methods. Initially a process was developed that involved using a syringe and DLP (Digital Light Processing) to create bubbles inside the photo-polymer resin. However, the results were unappealing, so upon further literature review, inspiration was found in a research paper in which the authors used an SLA (stereolithography) printer to create foamed parts by means of a polymer resin blended with a foaming agent that caused the part to expand after printing. Additionally, this research includes a thorough investigation of the mechanical characteristics of foams with various infill structures.
- Development of fiber-reinforced earth-based composites for 3D printing in constructionPublication . Joshi, Arpan; Bártolo, Helena Maria Coelho da Rocha Terreiro Galha da Silva; Craveiro, Flávio Gabriel da SilvaThe construction industry is one of the prime users of global resources and a major contributor to global environmental impacts. Moving to a clean, circular economy can facilitate the achievement of the European Green Deal objectives, such as minimum environmental impacts, net-zero CO2 emissions and zero waste. The digitalisation of the construction industry, also known as construction 4.0, is a recent trend in the construction sector. 3D printing technologies has been mainly used to create cementitious-based construction components. On the other hand, earth is an eco-friendly natural material, used as a construction material since ancient times, though the investigation of the physical and mechanical behaviour of earth-based composites for 3D printing has been limited. This research work main aim was the development of 3D printable fiber-reinforced earthbased composites. The physical properties and the rheology behaviour was investigated for different formulations of crude earth-based composites was investigated, as well its structural stability, to get a better understanding of its feasibility to be used as construction components. It is crucial to further investigate different formulations of earthen-based composites for extrusion-based technologies, optimizing its processing methods. A Life Cycle Assessment (LCA) of these crude earth-based composites must also be performed to investigate its environmental and economic performance regarding other material formulations.