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Design and manufacturing of hybrid high thermal conductive multi-material parts...
Cunha, Ângela Sofia VarelaUm dos principais desafios da indústria da moldação por injeção de plásticos está relacionado com o elevado tempo de arrefecimento após o ciclo de injeção. Este problema leva à diminuição da capacidade de produção e a um consequente aumento do custo associado ao processo e aos componentes finais. Nos últimos anos, a competitividade e o aumento da procura de um processo mais eficiente impulsionaram a investigaçã...
3D Multi-Material Laser Powder Bed Fusion of 420 stainless steel-Cu parts for P...
Cunha, Ângela Sofia Varela; Marques, Ana Cristina Ribeiro; Silva, Filipe Samuel; Carvalho, Óscar Samuel Novais; Bartolomeu, Flávio; Gasik, MichaelPlastic injection molding is one of the fastest-growing industries in the world. However, although it presents numerous advantages, the costs associated with the mold and machine are high and, therefore, this process is only profitable for mass production. Moreover, the reduction in the cycle time, more specifically the cooling time, has been a never-ending challenge since it has a direct influence on productio...
Multi-functional Inconel 718 - Pure Copper parts fabricated by 3D multi-materia...
Marques, Ana Cristina Ribeiro; Cunha, Ângela Sofia Varela; Gasik, Michael; Carvalho, Óscar Samuel Novais; Silva, Filipe Samuel; Bartolomeu, FlávioCurrently, most aerospace components are under extreme operating conditions such as high fluid pressure, mechanical loads, and thermal stresses [1,2]. The structural integrity of the component is assured by the use of high strength and temperature resistant materials as well distinct cooling mechanisms [1,2]. Inconel 718 (Inc718) is usually used in aerospace components (e.g rocket engines) due to their resistan...
Influence of laser parameters on the texturing of 420 stainless steel
Cunha, Ângela Sofia Varela; Bartolomeu, Flávio; Silva, Filipe; Trindade, Bruno; Carvalho, Óscar Samuel NovaisAISI 420 martensitic stainless steel is widely used in the mould industry due to its high tensile strength, hardness, and corrosion properties. Another requirement concerning any material used for this type of application is high thermal conductivity to minimise the time between consecutive injection cycles. The surfaces of some parts of the mould may be textured and reinforced with a material with higher therm...
3D Multi-Material Laser Powder Bed Fusion: an innovative 420 stainless steel-Cu...
Cunha, Ângela Sofia Varela; Marques, Ana Cristina Ribeiro; Silva, Filipe Samuel; Gasik, Michael; Trindade, Bruno; Carvalho, Óscar Samuel NovaisThe plastic injection molding industry is one of the fastest-growing industries in the world since it produces a huge amount of plastic-based components of various types and sizes for the electronics, automotive, pharmaceutical, and aerospace industries [1,2]. However, although it presents numerous advantages (high dimensional and geometric precision, repeatability, and adaptability to a wide range of materials...
Optimization of zirconia surface textured designs using Nd:Yag laser for biomed...
Marques, Ana Cristina Ribeiro; Cunha, Ângela Sofia Varela; Henriques, Bruno Alexandre Pacheco de Castro; Madeira, Sara Cristina SoaresThe development of surface textured designs has influence in primary stability of surgically placed implants since a textured surface allows to firmer mechanical link to the surrounding tissue. Laser technology has been investigated to develop new surface designs on green zirconia compacts by cold pressing. Nd:Yag laser were used to produce several strategies and different laser parameters (laser power, speed a...
Production and optimization of 316L stainless steel dimples by laser surface te...
Cunha, Ângela Sofia Varela; Ferreira, Ana Rita Machado; Marques, Ana Cristina Ribeiro; Trindade, Bruno; Silva, Filipe SamuelSurface patterning is of increasing interest in modern manufacturing processes to achieve better results in terms of wear resistance and friction of mechanical parts and tools and, consequently, to improve their lifetime in service conditions [1]. Several approaches have been used to modify the surface properties of steel components, namely deposition of coatings, sandblasting, and texturing by electron beam, e...
Tribological behavior of 316L stainless steel reinforced with CuCoBe + diamond ...
Cunha, Ângela Sofia Varela; Marques, Ana; Monteiro, Francisca; Silva, José; Silva, Mariana Isabel Santos Rodrigues; Trindade, Bruno; Ferreira, RitaThe aim of this work was to perform a statistical analysis in order to assess how the tribological properties of a laser textured 316L stainless steel reinforced with CuCoBe - diamond composites are affected by diamond particles size, type of technology (laser sintering and hot pressing) and time of tribological test. The analysis started with the description of all response variables. Then, by using IBM® SPSS ...
Analysis and comparison of a hydraulic and pneumatic system
Cunha, Ângela Sofia Varela; Veiga, João; Silva, Luís F.; Seabra, EuricoThis work addresses the modeling of a system using Modelica language and the Dymola software tool. Dymola is a modeling and simulation environment that uses the open Modelica language to map hardware components of physical systems directly into software components. Therefore, this modeling language allows the user to model a system in a physical form, rather than a mathematical fashion, through the use of gener...
Analysis and comparison of a hydraulic and pneumatic system using the Dymola so...
Cunha, Ângela Sofia Varela; Veiga, J.; Silva, Luís F.; Seabra, EuricoThis work addresses the modelling of a system using Modelica language and the Dymola software tool. Dymola is a modelling and simulation environment that uses the open Modelica language to map hardware components of physical systems directly into software components. Therefore, this modelling language allows the user to model a system in a physical form, rather than a mathematical fashion, through the use of ge...