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Comparative analysis of micro level indicators for evaluating the progress towa...
Matos, Joana; Martins, Carla I.; Simões, Carla L.; Simões, Ricardo João FerreiraWith the transition from a linear to a more circular economic model, tools are required to monitor the effect of adopted changes, and to assist in further decision-making along time. Within this context, circularity micro- indicators have been proposed by many authors as a fairly simple tool to measure progress towards a more circular economy, at the product or company level. However, these circularity micro-in...
Nível de conhecimento e implementação da economia circular nas indústrias portu...
Matos, Joana; Martins, Carla I.; Simões, Ricardo João Ferreira[Excerto] Os plásticos são considerados um dos principais geradores de resíduos da atualidade, pois são projetados, em grande parte, para seguirem uma estratégia de economia linear (produção, uso e descarte). A dificuldade em gerir o seu fim de vida leva a que uma percentagem considerável seja depositada em aterro, causando um enorme impacto ambiental, o consumo de recursos e a perda do seu valor económico.
Integrative simulation chain for improved components design: linking mould fill...
Barbosa, Carlos N.; Viana, J. C.; Franzen, Markus; Baranowski, Thomas; Simões, Ricardo João FerreiraComputer-Aided Engineering (CAE) is currently a standard tool in the development process of automotive components. For thermoplastic parts, for example, the manufacturing process is usually simulated with injection moulding simulation software, whereas passive safety is simulated with explicit crash software. Today, these two computational methods are only linked in the simulation of fbre-reinforced thermoplast...
Circularity micro-indicators applied to plastic parts: the materials perspective
Matos, Joana; Simões, Ricardo João Ferreira; Martins, Carla I.The use of polymeric materials has increased exponentially in recent decades in all application areas. However, currently, most plastic products are designed and manufactured without careful consideration of their end-of-life management. As a result, the generated waste presents a large diversity of different polymers (often including harmful additives), which are discharged in landfills, posing problems for su...
Application of circularity micro-indicators to plastic food packaging
Matos, Joana; Martins, Carla I.; Simões, Ricardo João FerreiraThe difficulty in combining sustainable polymeric options with the requirements to guarantee food quality and food safety, has impeded the transition to a more circular economy in the food packaging sector, although efforts have been made in recent years to redesign plastic packaging to consider its sustainability. The limitations imposed by both the legislation and the market also has prevented this transition...
Circularity micro-indicators for plastic packaging
Matos, Joana; Martins, Carla I.; Simões, Ricardo João FerreiraIn the last decades, we witnessed a continuous global increase in the consumption of plastics, with the packaging sector being a large contributor to this effect. However, while plastic packaging presents positive aspects, and is commercially advantageous, its sustainability is a concern. Associated with this, we have a traditional practice of linear economy use of plastic packaging, designed for single-use and...
Design and characterization of an active compression garment for the upper extr...
Goncalves, Carlos; Ferreira da Silva, Alexandre; Simões, Ricardo João Ferreira; Gomes, João; Stirling, Leia; Holschuh, BradThis paper presents the design, development, and testing of an active textile-based wearable compression device that is capable of delivering a controlled pulsatile compression. The device uses low spring index nickel titanium (NiTi) coil actuators to produce an applied dynamic pressure of up to 5.5 kPa. The selected NiTi coil actuators produce pressure when thermally stimulated with Joule heating via an applie...
A coupled finite volume flow solver for the solution of incompressible viscoela...
Fernandes, C.; Vukcevic, V.; Uroic, T.; Simões, Ricardo João Ferreira; Carneiro, O. S.; Jasak, H.; Nóbrega, J. M.In this work, a block coupled algorithm for the solution of laminar, incompressible viscoelastic flow problems on collocated grids is presented. The inter-equation coupling of the incompressible Cauchy momentum equations and extra-stress tensor constitutive equation is obtained by deriving a pressure equation in a procedure similar to a SIMPLE algorithm with the Rhie-Chow interpolation technique, and a special ...
Linking mould filling and structural simulations
Barbosa, Carlos Nuno Veiga; Viana, J. C.; Franzen, Markus; Baranowski, Thomas; Simões, Ricardo João FerreiraComputer Aided Engineering (CAE) is common standard in the development process within the automotive industry. For thermoplastic components, for example, the manufacturing process is commonly simulated with injection moulding simulation software and passive safety with explicit crash software. Currently both disciplines are only linked within the simulation of fibre reinforced thermoplastics to take into accoun...
Comprehensive study on the relationships between the processing, the microstruc...
Barbosa, Carlos N.; Simões, Ricardo João Ferreira; Franzen, Markus; Baranowski, Thomas; Viana, J. C.The relationship between the morphologies of different injection molded polypropylenes and their tensile properties measured at high strain rate were investigated. A threefold systematic analysis is proposed by establishing the following relationships: (i) processing-morphology; (ii) processing-mechanical properties; and (iii) morphology-mechanical properties. Experimental techniques were used to assess the str...