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Mechanical, electrical and electro-mechanical properties of thermoplastic elast...
Costa, Pedro; Silva, Jaime; Sencadas, Vitor; Simões, Ricardo; Viana, Julio C.; Lanceros-Mendez, SenentxuComposites of styrene–butadiene–styrene (SBS) block copolymer with multiwall carbon nanotubes were processed by solution casting to investigate the influence of filler content, the different ratios of styrene/butadiene in the copolymer and the architecture of the SBS matrix on the electrical, mechanical and electro-mechanical properties of the composites. It was found that filler content and elastomer matrix archi...
Thermomechanical environment characterisation in injection moulding and its rel...
Barbosa, Carlos N.; Simões, Ricardo; Franzen, Markus; Viana, Júlio C.This study is focused on the establishment of relationships between the injection moulding processing conditions, the applied thermomechanical environment (TME) and the tensile properties of talc-filled polypropylene,adopting a new extended concept of thermomechanical indices (TMI). In this approach, TMI are calculated from computational simulations of the moulding process that characterise the TME during proce...
Mechanical Behavior of the Lamellar Structure in Semi-Crystalline Polymers
Simões, Ricardo; Viana, Júlio C.; Dias, Gustavo R.; Cunha, António M.We have employed molecular dynamics simulations to study the behavior of virtual polymeric materials under an applied uniaxial tensile load. Through computer simulations, one can obtain experimentally inaccessible information about phenomena taking place at the molecular and microscopic levels. Not only can the global material response be monitored and characterized along time, but the response of macromolecula...
Electro-mechanical properties of triblock copolymer styrene-butadiene-styrene /...
Costa, Pedro; Ferreira, Armando; Sencadas, Vitor; Viana, Julio C.; Lanceros-Mendez, SenentxuThermoplastic elastomer/carbon nanotube composites are studied for sensor applications due to their excellent mechanical and electrical properties. Piezoresisitive properties of tri-block copolymer styrene-butadiene-styrene (SBS)/ carbon nanotubes (CNT) prepared by solution casting have been investigated. Young modulus of the SBS/CNT composites increases with the amount of CNT filler content present in the sam...
Effect of the Impact Conditions on the Mechanical Properties of Injection-Molde...
Barbosa, Carlos N.; Viana, Júlio C.; Franzen, Markus; Simões, RicardoThis work focused on the study of the impact event on molded parts in the framework of automotive components. The influence of the impact conditions and processing parameters on the mechanical behavior of talc-filled polypropylene specimens was analyzed. The specimens were lateral-gate discs produced by injection molding, and the mechanical characterization was performed through instrumented falling weight impa...
Networked embedded systems for active flow control in aircraft
Tovar, Eduardo; Pereira, Nuno; Bate, Iain; Indrusiak, Leandro; Penna, Sérgio; Negrão, José; Viana, Júlio C.; Philipp, François; Mayer, Dirk; Heras, JoséAerodynamic drag is known to be one of the factors contributing more to increased aircraft fuel consumption. The primary source of skin friction drag during flight is the boundary layer separation. This is the layer of air moving smoothly in the immediate vicinity of the aircraft. In this paper we discuss a cyber-physical system approach able of performing an efficient suppression of the turbulent flow by using...
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