School of Engineering and Sustainable Development
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Browsing School of Engineering and Sustainable Development by Subject "3D Printing"
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Item Open Access Gateways Toward Dissimilar Multi-material Parts(Society of Manufacturing Engineers, 2012-08) Jones, Jason B.; Cooper, David E.; Wimpenny, D. I. (David I.); Gibbons, G. J. (Greg)Nature provides a pattern of complex systems in which materials with vastly dissimilar properties grow together and function in close proximity. Although the gap between biological and existing AM systems cannot be overstated, the aspiration for AM to mimic this capability of nature has been widely admired (but is currently limited to multi-material parts made from families of like materials). The recent ASTM F2921 standard provides the first standardized framework to identify anisotropic properties of printed parts. This research highlights how understanding and quantifying the anisotropies between and within layers of printed parts provides foundational understanding to begin to emulate nature’s pattern by consolidating dissimilar multi-material parts in AM which promises future potential to supersede conventional part assembly with integral printed systems.Item Metadata only Industrial Case Studies, Rapid Manufacturing of Customised Products(2009-04) Jones, Jason B.; Barbolini, Roberto; Berselli, DavideItem Metadata only The Influence of Residual Toner Charge on 3D Laser Printed Objects(Society for Imaging Science and Technology, 2012-09) Jones, Jason B.; Wimpenny, David Ian; Gibbons, G. J. (Greg)The recent advances in digital fabrication have nearly become synonymous with the formulation of functional inks and inkjet printing. Conversely, dry toner systems, despite their high productivity and maturity in 2D digital printing, have scarcely been utilized for 3D printing and digital fabrication, despite significant endeavor. This paper reviews the advantages that laser printing offers digital fabrication (over inkjet) and provides insights to overcome the technical barriers which to date have prevented it from gaining traction as a 3D printing technique.Item Open Access The potential of converting plastic waste to 3D printed products in Sub-Saharan Africa(Elsevier, 2023-01-02) Oyinlola, M. A.; Okoya, Silifat Abimbola; Whitehead, Timothy; Evans, Mark; Lowe, Anna SeraAdditive manufacturing (3D printing) can transform low-income societies with underdeveloped infrastructure and inadequate manufacturing capabilities. However, uptake in sub-Saharan Africa is still very low. This study adopted a transdisciplinary approach which included critical synthesis of the extant literature, laboratory experiment and a cross sectional engagement with stakeholders, to examine the potential of converting plastic waste to 3D printed products in sub-Saharan Africa. The study showed that while several extruders have been developed in the last decade, there are still many challenges some of which include difficulty to produce filaments with consistent diameter, degraded mechanical properties and health hazards from emissions during extrusion. Furthermore, it was observed that communities across sub-Saharan Africa are interested in 3D printing but do not have sufficient understanding. The study highlights the need for building local capacity to develop, operate and maintain technologies associated with 3D printing.Item Metadata only Printed Circuit Boards by Selective Deposition and Processing(University of Texas, 2011-08) Jones, Jason B.; Wimpenny, D. I. (David I.); Chudasama, Rupesh; Gibbons, G. J. (Greg)With electronic applications on the horizon for AM, comes the dilemma of how to consolidate conductors, semi-conductors, and insulators in close proximity. To answer this challenge, laser printing (selective deposition) was used in tandem with fiber laser consolidation (selective processing) to produce PCBs for the first time. This combination offers the potential to generate tracks with high mechanical integrity and excellent electrical conductivity (close to bulk metal) without prolonged exposure of the substrate to elevated temperatures. Herein are the findings of a two-year feasibility study for a “one-stop” solution for producing PCBs (including conductive tracks, dielectric layers, protective resists, and legends).Item Metadata only Rheological Properties of HA Slurry for the Production of Bone Scaffolds by Layer Manufacturing(2007) Jones, Jason B.; Tallis, Andrea; Tillotta, V.; Moroz, Adam; Wimpenny, D. I. (David I.)In recent years, innovative methods have been developed for the repair and regeneration of damaged and diseased bone tissue. Ceramic bio-scaffolds provide advantageous features as compared to other materials. The potential exists to use a slurry* composed of silica and hydroxyapatite (HA) which can be extruded through a controlled rate/pressure nozzle for rapid and accurate manufacturing of the green body of the scaffold. In order to fine-tune the slurry to be used in this process analysis of the HA particles and rheological characterisation and testing of a range of slurry formulations was undertaken. The measurement of the viscosity, its time dependent behaviour and the strength of the internal structure of the slurry are vital tools to characterize the suitability of ceramic slurry for the extrusion process. A plotting trial was also conducted with the objective of examining the behaviour of the different formulations under a range of pressure/extrusion rate parameters. The composition of the slurry formulations was in the range of 30 to 40 weight % of HA and was eventually fine-tuned to 35% by weight HA, which gave the best performance from the point of view of viscosity, oscillation, and extrusion properties. It was observed that the slurries behaved in non-Newtonian, shear-dependent complex modes.Item Metadata only Standards: Levelling the Playing Field(2010) Jones, Jason B.The claimed benefits of globally accepted standards include: promotion of knowledge, improved communication and better transparency in commerce. The voluntary implementation of consensus standards has also been summed up as “levelling the playing field” to the mutual benefit of all. After over a decade of discussing the need for international standards, and in consideration of the limited scope of existing standards, 60 members of the Additive Manufacturing (AM) community organized themselves as ASTM Committee F42 in early 2009 with the aim to develop a cohesive and comprehensive set of AM standards. This presentation will review the Committee’s inception and accomplishments in the first 1.5 years including the new standards developed. It will also offer a view on its acceptance and impact in the AM community, outline where it is headed and explain how to get involved.