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One of the most promising areas for additive manufacturing (AM) adoption is in the healthcare industry, through its ability to produce customized medical devices with personalized fit, feel and functionality. The shift from conventional manufacturing systems to AM implies several changes throughout the medical product’s life cycle phases, from workforce qualification to the relationship with customers. This study investigates the social impact of adopting AM in the medical devices industry. To this end, two case studies related to medical devices were developed: a prosthesis and an orthosis, by applying a social life cycle assessment (S-LCA) methodology. The methodology measures and compares performance and impact of developing, producing, and using the two devices produced by AM, and by conventional processes. The results show how the different stakeholders along the product life cycle stages are affected by the change in the manufacturing technology. Evidence of positive social impacts were found in the ‘Customers’, ‘Local community’ and ‘Society’ stakeholders. A negative social impact was found for the stakeholder ‘Value chain actors’. Furthermore, this study illustrates the suitability of the S-LCA methodology to pinpoint the benefits and negative impacts of AM in each case under study.
Bruno Soares; Inês Ribeiro; Gonçalo Cardeal; Marco Leite; Helena Carvalho; Paulo Peças. Social life cycle performance of additive manufacturing in the healthcare industry: the orthosis and prosthesis cases. International Journal of Computer Integrated Manufacturing 2021, 34, 327 -340.
AMA StyleBruno Soares, Inês Ribeiro, Gonçalo Cardeal, Marco Leite, Helena Carvalho, Paulo Peças. Social life cycle performance of additive manufacturing in the healthcare industry: the orthosis and prosthesis cases. International Journal of Computer Integrated Manufacturing. 2021; 34 (3):327-340.
Chicago/Turabian StyleBruno Soares; Inês Ribeiro; Gonçalo Cardeal; Marco Leite; Helena Carvalho; Paulo Peças. 2021. "Social life cycle performance of additive manufacturing in the healthcare industry: the orthosis and prosthesis cases." International Journal of Computer Integrated Manufacturing 34, no. 3: 327-340.
Fused filament fabrication (FFF) is an additive manufacturing (AM) process that is intended to build three-dimensional objects through selective deposition of melted material layer-by-layer along a pre-determined path. In the last few years, the utilization of the FFF technology has grown at a high pace and today its use has become widespread in several applications. In the light of the premises, this work emerges as a technology push effort to develop an innovative FFF machine where cylindrical coordinate-based print motion is combined with multiple print heads. The proposed FFF machine was conceived and designed guided by appropriate methodologies concerning product development, assembly, servicing, and design for AM. Furthermore, as a proof of concept, a physical prototype was produced gathering traditional manufacturing processes with AM. The physical prototype was validated with speed, temperature, and deposition tests. The presented FFF machine presents higher manufacturing versatility due to the possibility of processing different materials (in the same part and in all printing area) with an increased production rate, that enables printing up to three parts simultaneously.
Diogo Líbano Monteiro; Carlos Miguel Santos Vicente; Marco Alexandre De Oliveira Leite; António Manuel Relógio Ribeiro. Development of a cylindrical coordinate-based fused filament fabrication machine with multiple print heads. The International Journal of Advanced Manufacturing Technology 2020, 110, 3129 -3143.
AMA StyleDiogo Líbano Monteiro, Carlos Miguel Santos Vicente, Marco Alexandre De Oliveira Leite, António Manuel Relógio Ribeiro. Development of a cylindrical coordinate-based fused filament fabrication machine with multiple print heads. The International Journal of Advanced Manufacturing Technology. 2020; 110 (11-12):3129-3143.
Chicago/Turabian StyleDiogo Líbano Monteiro; Carlos Miguel Santos Vicente; Marco Alexandre De Oliveira Leite; António Manuel Relógio Ribeiro. 2020. "Development of a cylindrical coordinate-based fused filament fabrication machine with multiple print heads." The International Journal of Advanced Manufacturing Technology 110, no. 11-12: 3129-3143.
The current work aims to develop high solid load zirconia pastes without organic binder additives, for the robocasting of dental structures. The effect of the amount of Dolapix CE64 dispersant on the stabilisation of zirconia aqueous suspensions was first tested. The determined optimal amount of dispersant was then used to produce pastes with zirconia concentration in the 80−90 wt% range. Pastes were further studied regarding rheological behaviour and printability. The most printable were used to produce parallelepiped blocks by robocasting; slip casting samples were also produced for comparison. Density, surface roughness, porosity, hardness and toughness of both types of samples were assessed after sintering. Finally, a model molar tooth was produced by robocasting and sintered. The most encouraging robocasting results were obtained using a paste with 0.5 wt% Dolapix CE64 and 88 wt% zirconia. The produced samples displayed 97.1 % of theoretical density, Vickers hardness of 1485 ± 32 and fracture toughness of 4.11 ± 0.09 MPa.m1/2 after sintering. Similar values were obtained for slip casting parts. A model molar tooth with adequate surface finishing was successfully obtained using the described processing parameters, together with a brushing treatment carried out in the green state. Attained results show that it is possible to build zirconia prosthetic dental structures with adequate morphological and mechanical properties by robocasting of binder free pastes. This opens an opportunity window for the cost-effective and environmentally friendly customized production of prosthetic dental structures by additive manufacturing.
I. Rodrigues; M. Guedes; S. Olhero; A. Chefdor; Ana Catarina Branco; Marco Leite; A.P. Serro; C.G. Figueiredo-Pina. Development of free binder zirconia-based pastes for the production of dental pieces by robocasting. Journal of Manufacturing Processes 2020, 57, 1 -9.
AMA StyleI. Rodrigues, M. Guedes, S. Olhero, A. Chefdor, Ana Catarina Branco, Marco Leite, A.P. Serro, C.G. Figueiredo-Pina. Development of free binder zirconia-based pastes for the production of dental pieces by robocasting. Journal of Manufacturing Processes. 2020; 57 ():1-9.
Chicago/Turabian StyleI. Rodrigues; M. Guedes; S. Olhero; A. Chefdor; Ana Catarina Branco; Marco Leite; A.P. Serro; C.G. Figueiredo-Pina. 2020. "Development of free binder zirconia-based pastes for the production of dental pieces by robocasting." Journal of Manufacturing Processes 57, no. : 1-9.
This chapter aims to present new design and modelling methods for hybrid additive manufacturing (AM) technologies with thermoplastic composites, regarding material processability, functional requirements and manufacturing specificities of additive, subtractive and hybrid operation modes. Multifunctional and graded features are presented since the potential of the design and modelling approaches is enhanced in the development of these innovative features. Moreover, a sustainability assessment in AM-related processes covering the product and process life cycle (LC) performance, economic, environmental and social assessments, as well as the main AM challenges and opportunities, will be in-depth discussed.
Carlos Vicente; Celeste Jacinto; Helena Carvalho; Inês Ribeiro; Luís Reis; Marco Leite; Paulo Peças; Relógio Ribeiro; Sílvia Esteves. Design and Modelling Approaches. Advanced Structured Materials 2020, 57 -91.
AMA StyleCarlos Vicente, Celeste Jacinto, Helena Carvalho, Inês Ribeiro, Luís Reis, Marco Leite, Paulo Peças, Relógio Ribeiro, Sílvia Esteves. Design and Modelling Approaches. Advanced Structured Materials. 2020; ():57-91.
Chicago/Turabian StyleCarlos Vicente; Celeste Jacinto; Helena Carvalho; Inês Ribeiro; Luís Reis; Marco Leite; Paulo Peças; Relógio Ribeiro; Sílvia Esteves. 2020. "Design and Modelling Approaches." Advanced Structured Materials , no. : 57-91.
This chapter is devoted to the study of the key principles of AM value chain, including materials (in particular fibre-reinforced thermoplastics—FRTP), pre-processing, process and control aspects, design features, quality and robustness issues, applications and sustainability concerns. It will label the technological challenges involved and outline the potential of applicability of a roadmap. After starting with materials, processes and applications mapping, we will address new strategies for AM FRTP parts performance improvement. Then, FRTP parts certification and quality assurance will be discussed and a LCA/LCC analysis of composite materials is presented. Finally, a AM and composites research roadmap is proposed.
Isaac Ferreira; Margarida Machado; Elsa Henriques; Marco Leite; Paulo Peças; António Torres Marques. State-of-the-Art Review and Roadmap. Advanced Structured Materials 2020, 1 -56.
AMA StyleIsaac Ferreira, Margarida Machado, Elsa Henriques, Marco Leite, Paulo Peças, António Torres Marques. State-of-the-Art Review and Roadmap. Advanced Structured Materials. 2020; ():1-56.
Chicago/Turabian StyleIsaac Ferreira; Margarida Machado; Elsa Henriques; Marco Leite; Paulo Peças; António Torres Marques. 2020. "State-of-the-Art Review and Roadmap." Advanced Structured Materials , no. : 1-56.
Sandwich panels are widely used in many engineering applications where saving weight while maintaining high strength and stiffness is required. The most common core structure in sandwich panels is the two-dimensional regular hexagonal cell shape, denoted as Honeycomb. In recent times, bioinspired materials and structures have become increasingly attractive to researchers, as they provide adequate functional properties. The goal of the present work is to study two new bioinspired structures aimed at improving the performance of sandwich panel cores. Among all the large amount of structures that nature provides, two novel cores inspired in the structures of enamel and of bamboo were chosen. The compressive and flexural properties of these two innovative cellular structures were assessed and compared with the classic honeycomb. All the arrangements were numerically simulated for different relative densities. The fused deposition modelling technique enables to print selected samples in polylactic acid that were experimentally tested in compression and in bending. Results show that the mechanical properties depend strongly on the core geometry, on the relative density and on the cell thickness distribution. A satisfactory agreement was found between finite element results and experimental data. For the same relative density, the bioinspired natural structures proposed in the present study are potential competitors with the traditional core structures in what concerns strength, stiffness and energy absorption.
J Bru; Marco Leite; António Ribeiro; Luis Reis; Am Deus; M Fátima Vaz. Bioinspired structures for core sandwich composites produced by fused deposition modelling. Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 2019, 234, 379 -393.
AMA StyleJ Bru, Marco Leite, António Ribeiro, Luis Reis, Am Deus, M Fátima Vaz. Bioinspired structures for core sandwich composites produced by fused deposition modelling. Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications. 2019; 234 (3):379-393.
Chicago/Turabian StyleJ Bru; Marco Leite; António Ribeiro; Luis Reis; Am Deus; M Fátima Vaz. 2019. "Bioinspired structures for core sandwich composites produced by fused deposition modelling." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 234, no. 3: 379-393.
This work aims to determine the influence of fused deposition modeling (FDM) printing parameters on the mechanical properties of parts fabricated on an Ultimaker2 printer with acrylonitrile butadiene styrene (ABS). The effect of several parameters such as interlayer cooling time (ILCT), nozzle diameter, infill density, raster angle and layer thickness on the ultimate tensile strength, yield strength, and elastic modulus of produced parts was evaluated. Two independent studies were conducted: a first study dedicated to the ILCT and a second study where the influence of other parameters was evaluated through a design of experiments (DoE) approach. Both studies were carried out through the execution of standard tensile tests. The statistical analysis of tensile tests results was processed with the ANOVA methodology. The obtained results indicate that a reduced ILCT improves the tensile strength of parts. It is shown that nozzle diameter and infill density are the parameters that most influence the mechanical properties of ABS, with the upper range selected values improving the studied mechanical properties. The raster angle configuration of (−45o/45o) benefits UTS and yield strength of ABS samples. Interactions of nozzle diameter on layer thickness were detected. It was observed that smaller layer thickness promotes a higher elastic modulus and UTS; however, for thinner layers (0.06‐0.10 mm), no significant differences were found on strength of samples due to potential high distortion levels.
Carlos Vicente; Tomás S. Martins; Marco Leite; António Ribeiro; Luís Reis. Influence of fused deposition modeling parameters on the mechanical properties of ABS parts. Polymers for Advanced Technologies 2019, 31, 501 -507.
AMA StyleCarlos Vicente, Tomás S. Martins, Marco Leite, António Ribeiro, Luís Reis. Influence of fused deposition modeling parameters on the mechanical properties of ABS parts. Polymers for Advanced Technologies. 2019; 31 (3):501-507.
Chicago/Turabian StyleCarlos Vicente; Tomás S. Martins; Marco Leite; António Ribeiro; Luís Reis. 2019. "Influence of fused deposition modeling parameters on the mechanical properties of ABS parts." Polymers for Advanced Technologies 31, no. 3: 501-507.
Personalized medicine is a trend where the approach to the treatment is focused on the patient, rather than an approach where “one size fits all”. The objective is to develop devices and treatments where the needs of doctors and patients are attended, and the generated concepts address those needs. Additive manufacturing is an enabler of these types of devices, since it is a technology well adapted to complex shapes and one series production. In this paper, the authors present two case studies in rehabilitation, one for a knee positioning orthosis for an adolescent with cerebral palsy and the other for a prosthetic arm for a toddler. In both cases the adopted methodology is similar: from imageology images, a generation of concepts is embodied and manufactured through the use of 3D printers. The use of adequate materials allows for the generation of orthosis and prosthetics fully customized to the patients’ needs and aligned with the doctor’s recommendations. Personalized medicine will allow for a reduction of rejection levels, an increase of patient’s quality of life and to a reduction or a delaying of downstream problems. The two case studies presented here demonstrate the potential for additive manufacturing in the area of rehabilitation.
Marco Leite; Bruno Soares; Vanessa Lopes; Sara Santos; Miguel Tavares da Silva. Design for personalized medicine in orthotics and prosthetics. Procedia CIRP 2019, 84, 457 -461.
AMA StyleMarco Leite, Bruno Soares, Vanessa Lopes, Sara Santos, Miguel Tavares da Silva. Design for personalized medicine in orthotics and prosthetics. Procedia CIRP. 2019; 84 ():457-461.
Chicago/Turabian StyleMarco Leite; Bruno Soares; Vanessa Lopes; Sara Santos; Miguel Tavares da Silva. 2019. "Design for personalized medicine in orthotics and prosthetics." Procedia CIRP 84, no. : 457-461.
Design complexity and its relation to Design for Manufacturing continues to be a challenging topic, namely when the objective is to address these aspects in a straightforward manner to young or less experienced design teams. The availability of practical methodologies that induce rules to support novel design creation, in the environment of manufacturing processes, continues to be scarce. This work presents a novel approach named - 0-3D Design Method - that aims to define, in a systematic and geometrical manner, practical rules that allows mechanical designers to relate, in a codified manner, the design geometry of a given mechanical component to the typical manufacturing processes that permit its physical embodiment. The method proposes the definition of types and sub-types of parts, based on the number of spatial dimensions that need to be modified for a given design construction, and its relation to the manufacturing phase of the product life-cycle. A practical mechanical design example is presented to demonstrate the methodology, mapping the parts necessary for the design of a cutting head of a machine-tool.
António Baptista; Luis Reis; M. Leite. 0-3D Design method: a new design management technique to support Design for Manufacturing. Procedia CIRP 2019, 84, 155 -158.
AMA StyleAntónio Baptista, Luis Reis, M. Leite. 0-3D Design method: a new design management technique to support Design for Manufacturing. Procedia CIRP. 2019; 84 ():155-158.
Chicago/Turabian StyleAntónio Baptista; Luis Reis; M. Leite. 2019. "0-3D Design method: a new design management technique to support Design for Manufacturing." Procedia CIRP 84, no. : 155-158.
The purpose of this work is to compare the creative outcome in the educational context of students belonging to two different cultures, namely Singaporean and Portuguese and determine whether they respond differently to the same design brief. The participants from both samples equal 121 student designers and span from 18–25 years old. Students were randomly distributed within a uniform, standard of student performance, which allowed for fair comparison between groups. Expert judges were employed to judge the creativity of concept sketches generated during a Collaborative Sketching exercise. To evaluate the creative outcome, we employed the Consensual Assessment Technique based on a rubric-based system developed in our earlier works. The analysis of variance procedure revealed no statistically significant difference between the averaged total scores of the two groups on the appropriateness measure. However, the student designers from both samples showed statistically significant differences when provided with a baseline brief in the novelty measure. In consideration of the overall creativity scores, a relatively equivalent performance is observed across the two universities.
Georgios Koronis; Rianne Wally Meurzec; Arlindo Silva; Marco Leite; Elsa Henriques; Christine Yogiaman. Cross-Cultural Differences in Creative Ideation: A Comparison between Singaporean and Portuguese Students. Proceedings of the Design Society: International Conference on Engineering Design 2019, 1, 89 -98.
AMA StyleGeorgios Koronis, Rianne Wally Meurzec, Arlindo Silva, Marco Leite, Elsa Henriques, Christine Yogiaman. Cross-Cultural Differences in Creative Ideation: A Comparison between Singaporean and Portuguese Students. Proceedings of the Design Society: International Conference on Engineering Design. 2019; 1 (1):89-98.
Chicago/Turabian StyleGeorgios Koronis; Rianne Wally Meurzec; Arlindo Silva; Marco Leite; Elsa Henriques; Christine Yogiaman. 2019. "Cross-Cultural Differences in Creative Ideation: A Comparison between Singaporean and Portuguese Students." Proceedings of the Design Society: International Conference on Engineering Design 1, no. 1: 89-98.
Hugo Araújo; Marco Leite; Amr Ribeiro; Augusto Deus; Luis Reis; M F Vaz. Investigating the contribution of geometry on the failure of cellular core structures obtained by additive manufacturing. Frattura ed Integrità Strutturale 2019, 13, 478 -486.
AMA StyleHugo Araújo, Marco Leite, Amr Ribeiro, Augusto Deus, Luis Reis, M F Vaz. Investigating the contribution of geometry on the failure of cellular core structures obtained by additive manufacturing. Frattura ed Integrità Strutturale. 2019; 13 (49):478-486.
Chicago/Turabian StyleHugo Araújo; Marco Leite; Amr Ribeiro; Augusto Deus; Luis Reis; M F Vaz. 2019. "Investigating the contribution of geometry on the failure of cellular core structures obtained by additive manufacturing." Frattura ed Integrità Strutturale 13, no. 49: 478-486.
The main objective of this paper is to develop a model that will combine economic and environmental assessment tools to support the composite material selection of aircraft structures in the early phases of design and application of the tool for an aircraft elevator. An integrated life cycle cost (LCC) and life cycle assessment (LCA) methodology was used as part of the sustainable design approach for the laminate stacking sequence design. The model considered is the aircraft structure made of carbon fiber reinforce plastic prepreg and processed via hand layup-autoclave process which is the preferred method for the aircraft industry. The model was applied to a cargo aircraft elevator case study by comparing six different laminate configurations and two different carbon fiber prepreg materials across aircraft’s entire life cycle. The results show, in line with other studies using different methodologies (e.g., life cycle engineering, or LCE), that the combination of LCA with LCC is a worthwhile approach for comparing the different laminate configurations in terms of cost and environmental impact to support composite laminate stacking design by providing the best trade-off between cost and environment. Elevator LCC reduces 19% by changing the material type and applying different ply orientations. Elevator LCA score reduces 53% by selecting the optimum instead of best technical solution that minimizes the displacement. Improving the structural performance does not always lead to an increase in the cost.
Elcin Aleixo Calado; Marco Leite; Arlindo Silva. Integrating life cycle assessment (LCA) and life cycle costing (LCC) in the early phases of aircraft structural design: an elevator case study. The International Journal of Life Cycle Assessment 2019, 24, 2091 -2110.
AMA StyleElcin Aleixo Calado, Marco Leite, Arlindo Silva. Integrating life cycle assessment (LCA) and life cycle costing (LCC) in the early phases of aircraft structural design: an elevator case study. The International Journal of Life Cycle Assessment. 2019; 24 (12):2091-2110.
Chicago/Turabian StyleElcin Aleixo Calado; Marco Leite; Arlindo Silva. 2019. "Integrating life cycle assessment (LCA) and life cycle costing (LCC) in the early phases of aircraft structural design: an elevator case study." The International Journal of Life Cycle Assessment 24, no. 12: 2091-2110.
Fused deposition modelling (FDM) shows a great potential for the production of complex shapes in the case of several materials including nylon, which is a type of polyamide. In such materials, water absorption is an issue that requires attention and there is interest in studying the application of protective products, with the goal of improving the sealing properties of the parts. The objective of this work is to analyze and evaluate the water absorption, mechanical properties and consequent failure surfaces of nylon parts obtained by FDM, with two raster angles, after being coated with a protective material. Two polymeric products were used to coat the parts, polyurethane elastomer and silicone. The performance of the coated parts was evaluated with water absorption tests, as well as compression and tensile tests. The treatment was found to reduce the open porosity and to decrease the mechanical properties of the specimens in different raster angles. Failure occurs at surfaces making angles of zero or forty five degrees from the applied force, depending on the raster angle, both in treated and untreated samples.
M. Miguel; Marco Leite; António Ribeiro; Augusto Deus; Luis Reis; M F Vaz. Failure of polymer coated nylon parts produced by additive manufacturing. Engineering Failure Analysis 2019, 101, 485 -492.
AMA StyleM. Miguel, Marco Leite, António Ribeiro, Augusto Deus, Luis Reis, M F Vaz. Failure of polymer coated nylon parts produced by additive manufacturing. Engineering Failure Analysis. 2019; 101 ():485-492.
Chicago/Turabian StyleM. Miguel; Marco Leite; António Ribeiro; Augusto Deus; Luis Reis; M F Vaz. 2019. "Failure of polymer coated nylon parts produced by additive manufacturing." Engineering Failure Analysis 101, no. : 485-492.
Carlos Vicente; João Fernandes; Augusto Deus; M F Vaz; Marco Leite; Luis Reis. Effect of protective coatings on the water absorption and mechanical properties of 3D printed PLA. Frattura ed Integrità Strutturale 2019, 13, 748 -756.
AMA StyleCarlos Vicente, João Fernandes, Augusto Deus, M F Vaz, Marco Leite, Luis Reis. Effect of protective coatings on the water absorption and mechanical properties of 3D printed PLA. Frattura ed Integrità Strutturale. 2019; 13 (48):748-756.
Chicago/Turabian StyleCarlos Vicente; João Fernandes; Augusto Deus; M F Vaz; Marco Leite; Luis Reis. 2019. "Effect of protective coatings on the water absorption and mechanical properties of 3D printed PLA." Frattura ed Integrità Strutturale 13, no. 48: 748-756.
A. Castelão; B.A.R. Soares; Carla Machado; M. Leite; A.J.M. Mourão. Design for AM: Contributions from surface finish, part geometry and part positioning. Procedia CIRP 2019, 84, 491 -495.
AMA StyleA. Castelão, B.A.R. Soares, Carla Machado, M. Leite, A.J.M. Mourão. Design for AM: Contributions from surface finish, part geometry and part positioning. Procedia CIRP. 2019; 84 ():491-495.
Chicago/Turabian StyleA. Castelão; B.A.R. Soares; Carla Machado; M. Leite; A.J.M. Mourão. 2019. "Design for AM: Contributions from surface finish, part geometry and part positioning." Procedia CIRP 84, no. : 491-495.
There is significant work published in recent years about natural fibres polymeric composites. Most of the studies are about the characterization of natural fibres and their comparison with conventional composites regarding mechanical behaviour and application performance. There are dozens of types of natural fibres with different properties influencing their use, or not, in specific industrial applications. The natural origin of these materials causes, in general, a wide range of variations in properties depending mainly on the harvesting location and conditions, making it difficult to select the appropriate fibre for a specific application. In this paper, a comprehensive review about the properties of natural fibres used as composite materials reinforcement is presented, aiming to map where each type of fibre is positioned in several properties. Recent published work on emergent types of fibres is also reviewed. A bibliometric study regarding applications of natural fibres composites is presented. A prospective analysis about the future trends of natural fibres applications and the required developments to broaden their applications is also presented and discussed.
Paulo Peças; Hugo Carvalho; Hafiz Salman; Marco Leite. Natural Fibre Composites and Their Applications: A Review. Journal of Composites Science 2018, 2, 66 .
AMA StylePaulo Peças, Hugo Carvalho, Hafiz Salman, Marco Leite. Natural Fibre Composites and Their Applications: A Review. Journal of Composites Science. 2018; 2 (4):66.
Chicago/Turabian StylePaulo Peças; Hugo Carvalho; Hafiz Salman; Marco Leite. 2018. "Natural Fibre Composites and Their Applications: A Review." Journal of Composites Science 2, no. 4: 66.
Elcin Aleixo Calado; Marco Leite; Arlindo Silva. Selecting composite materials considering cost and environmental impact in the early phases of aircraft structure design. Journal of Cleaner Production 2018, 186, 113 -122.
AMA StyleElcin Aleixo Calado, Marco Leite, Arlindo Silva. Selecting composite materials considering cost and environmental impact in the early phases of aircraft structure design. Journal of Cleaner Production. 2018; 186 ():113-122.
Chicago/Turabian StyleElcin Aleixo Calado; Marco Leite; Arlindo Silva. 2018. "Selecting composite materials considering cost and environmental impact in the early phases of aircraft structure design." Journal of Cleaner Production 186, no. : 113-122.
Product design and development (PDD) is a current topic of academic and industrial research. Emphasis on innovation and entrepreneurship, as well as design thinking and creativity has been recently pulled together into the teaching and research on PDD. This paper looks into a multidisciplinary setting made up of three similar but independent PDD masters courses taught at three higher education institutions, having the same assessment, syllabus, assignments and outcomes. As expected, students’ projects foci are different. The outcomes of this experience were confronted with an ex-post literature review, which generated thorough guidelines that supported an innovative proposal for PDD education, to be implemented into an interdisciplinary Summer School. Significant generalisable contributions for educating modern engineers, designers and business entrepreneurs are expected, instead of just teaching methods of engineering, design and entrepreneurship at the case universities. The limitation of the used inductive reasoning concerns ‘truth’ being suggested but not assured.
J.M. Vilas-Boas da Silva; Marco Leite; João Vilas-Boas; Ricardo Simoes. How education background affects design outcome: teaching product development to mechanical engineers, industrial designers and managers. European Journal of Engineering Education 2018, 44, 545 -569.
AMA StyleJ.M. Vilas-Boas da Silva, Marco Leite, João Vilas-Boas, Ricardo Simoes. How education background affects design outcome: teaching product development to mechanical engineers, industrial designers and managers. European Journal of Engineering Education. 2018; 44 (4):545-569.
Chicago/Turabian StyleJ.M. Vilas-Boas da Silva; Marco Leite; João Vilas-Boas; Ricardo Simoes. 2018. "How education background affects design outcome: teaching product development to mechanical engineers, industrial designers and managers." European Journal of Engineering Education 44, no. 4: 545-569.
Biranchi Panda; Marco Leite; Bibhuti Bhusan Biswal; Xiaodong Niu; Akhil Garg. Experimental and numerical modelling of mechanical properties of 3D printed honeycomb structures. Measurement 2018, 116, 495 -506.
AMA StyleBiranchi Panda, Marco Leite, Bibhuti Bhusan Biswal, Xiaodong Niu, Akhil Garg. Experimental and numerical modelling of mechanical properties of 3D printed honeycomb structures. Measurement. 2018; 116 ():495-506.
Chicago/Turabian StyleBiranchi Panda; Marco Leite; Bibhuti Bhusan Biswal; Xiaodong Niu; Akhil Garg. 2018. "Experimental and numerical modelling of mechanical properties of 3D printed honeycomb structures." Measurement 116, no. : 495-506.
Purpose The purpose of this paper is to investigate the effect of a sealing protective treatment on the water absorption and mechanical properties of acrylonitrile butadiene styrene (ABS)-printed parts by fused deposition modelling. Protective products include aqueous acetone solutions with different concentrations, polyurethane wood sealer and aqueous acrylic-based varnish. Design/methodology/approach Open porosity was estimated by the absorption coefficient and the total amount of water retained, obtained from water absorption tests. Mechanical characterization was performed by compressive and tensile tests. Different specimens with different build directions and raster angles were used. Findings The treatments with acetone solutions were not effective in reducing the porosity of ABS parts, as the amount of acetone that reduces effectively the porosity will also affect the sample dimensional stability. The polyurethane treatment was found to reduce the absorption coefficient, but the maximum water content and the open porosity remain almost unchanged in comparison with the ones obtained for untreated specimens. The treatment with an acrylic-based varnish was found to preserve the dimensional stability of the specimens, to reduce the open porosity and to maintain the compression and tension properties of the specimens in different build directions and raster angles. Originality/value Surface modification for water tight applications of ABS 3D printing parts enables new designs where both sealing and the preservation of mechanical properties are important. As per the knowledge of the authors, the water absorption and the mechanical behaviour of ABS 3D printed parts, before and after treatment, were not previously investigated.
Marco Leite; André Varanda; António Relógio Ribeiro; Arlindo Silva; M F Vaz. Mechanical properties and water absorption of surface modified ABS 3D printed by fused deposition modelling. Rapid Prototyping Journal 2018, 24, 195 -203.
AMA StyleMarco Leite, André Varanda, António Relógio Ribeiro, Arlindo Silva, M F Vaz. Mechanical properties and water absorption of surface modified ABS 3D printed by fused deposition modelling. Rapid Prototyping Journal. 2018; 24 (1):195-203.
Chicago/Turabian StyleMarco Leite; André Varanda; António Relógio Ribeiro; Arlindo Silva; M F Vaz. 2018. "Mechanical properties and water absorption of surface modified ABS 3D printed by fused deposition modelling." Rapid Prototyping Journal 24, no. 1: 195-203.