7 documents found, page 1 of 1
Flow visualizations in a PDMS cerebral aneurysm biomodel
Souza, Andrews Victor Almeida; Ferrera, Conrado; Puga, Hélder; Lima, Rui A.; Ribeiro, J.E.; Souza, Maria SabrinaCerebral aneurysm is an abnormal dilatation of the blood vessel which affects a high percentage of the worldwide population. One way to investigate this pathology is using in vivo techniques, but these types of experiments have a high cost and low reproducibility. Thus, to understand the local hemodynamics of brain aneurysms, it is imperative to manufacture in vitro models that simulate real brain aneurysms. Th...
Additive manufacturing techniques for the fabrication of intracranial aneurysm ...
Rodrigues, D.; Souza, A.; Souza, Maria Sabrina; Ferrera, Conrado; Ribeiro, J.E.; Lima, Rui A.The hemodynamics of intracranial aneurysm (IA) involves complex phenomena that influence its growth and rupture. The advancement of additive manufacturing techniques allowed the development of biomodels suitable for in vitro experimental tests. Thus, we present in this work the process of manufacturing flow biomodels, using different additive manufacturing techniques and materials. The biomodels obtained throug...
Fluid flow and structural numerical analysis of a cerebral aneurysm model
Souza, Maria Sabrina; Souza, Andrews Victor Almeida; Carvalho, Violeta Meneses; Teixeira, Senhorinha F.C.F.; Fernandes, Carla S.; Lima, Rui A.Intracranial aneurysms (IA) are dilations of the cerebral arteries and, in most cases, have no symptoms. However, it is a very serious pathology, with a high mortality rate after rupture. Several studies have been focused only on the hemodynamics of the flow within the IA. However, besides the effect of the flow, the development and rupture of the IA are also associated with a combination of other factors such ...
Parametric optimization of the GMAW welding process in thin thickness of austen...
Nobrega, Glauco Tapijara Vallicelli; Souza, Maria Sabrina; Rodríguez-Martín, Manuel; Rodríguez-Gonzálvez, Pablo; Ribeiro, J.E.In the present work, an analysis of different welding parameters was carried out on the welding of stainless-steel thin thickness tubes by the Gas Metal Arc Welding (GMAW) process. The influence of three main parameters, welding voltage, movement angle, and welding current in the quality of the welds, was studied through a specifically designed experimental process based on the establishment of three different ...
Experimental and numerical study to minimize the residual stresses in welding o...
Costa, Sharlane; Souza, Maria Sabrina; Braz-César, Manuel; Gonçalves, José; Ribeiro, J.E.One of the most important negative consequence in the fusion welding processes is the generation of tensile residual stresses in welded joints. The main goals of this work are to determine the optimal combination of welding parameters to minimize the residual stress level and the influence of each welding parameter in that feature to weld 6082-T6 aluminum alloy plates using the GMAW welding process. To achieve ...
Manual and automatic image analysis segmentation methods for blood flow studies...
Carvalho, Violeta Meneses; Gonçalves, Inês M.; Souza, Andrews Victor Almeida; Souza, Maria Sabrina; Bento, David; Ribeiro, J.E.; Lima, Rui A.In blood flow studies, image analysis plays an extremely important role to examine raw data obtained by high-speed video microscopy systems. This work shows different ways to process the images which contain various blood phenomena happening in microfluidic devices and in microcirculation. For this purpose, the current methods used for tracking red blood cells (RBCs) flowing through a glass capillary and techni...
Estudo numérico do fluxo num aneurisma intracraniano real para diferentes númer...
Souza, Maria SabrinaO aneurisma intracraniano (AI) é uma patologia que na maioria dos casos não apresenta sintomas no paciente e ainda não está bem compreendida em relação a interação de fatores que a desenvolvem. Atualmente, as avaliações de risco de ruptura são baseadas, principalmente, no tamanho do AI, o que não é muito confiável, visto que aneurisma pequenos também se rompem. Além disso, existem controvérsias relacionadas a v...