Bruno Ramôa's research while affiliated with University of Minho and other places
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Publications (5)
Code verification is an intricate but crucial part of numerical code development. Due to the complexity of the partial differential equations, an analytical solution might not exist. In those situations and aiming at proving that the code is solving appropriately the governing equations, the method of manufactured solutions (MMS) is a powerful tool...
It is well known that the processing conditions in polymer processing have a high impact on the resulting material morphology and consequently the component’s mechanical behavior. However, especially for semicrystalline polymers, the tools available for predicting the final morphology of injection molding parts still have significant limitations. I...
Toe caps are one of the most important components in safety footwear, but have a significant contribution to the weight of the shoe. Efforts have been made to replace steel toe caps by polymeric ones, since they are lighter, insulated and insensitive to magnetic fields. Nevertheless, polymeric solutions require larger volumes, which has a negative...
In the present study, the simulation of the three-dimensional (3D) non-isothermal, non-Newtonian fluid flow of polymer melts is investigated. In particular, the filling stage of thermoplastic injection molding is numerically studied with a solver implemented in the open-source computational library O p e n F O A M ® . The numerical method is based...
Polymers are used in a wide range of applications and their properties are dependent upon the morphological development during processing and the specimen configuration which in turn define the mechanical properties. In this context fatigue and monotonic testing are part of the standard procedure to assess relevant mechanical and material parameter...
Citations
... Optimal test parameters (i.e., 50 mm metric and 17 • bend angle) were used to evaluate the traction effectiveness of the footwear, in line with similar literature studies [22]. To mimic the material properties of polyurethane, the outsoles were modeled with a hyperelastic neo-Hookean material model [38,39]. A contact pair was applied between the outsole and the ground to simulate the contact interaction. ...
... Both the steps of the simulation are carried out using OpenFOAM, an open-source package, where chimera/overset mesh methodology is used to simulate the movement of the nozzle in the first step, and a compression plate is used in the second step. OpenFOAM was previously used to model the injection molding and fused deposition processes [14][15][16][17][18]. While modeling of injection molding does not require any mesh movement, the fused deposition is modeled using a deformable mesh to simulate substrate movement. ...
... Due to its material properties such as high stiffness, dimensional stability and fatigue resistance, polyoxymethylene (POM) is currently used in many technical applications [1][2][3]. While the fracture mechanical properties of POM are already available in mode I and mixed mode I+III under monotonic loading and cyclic fatigue tests [4][5][6][7][8], to the authors' knowledge, little is known about its fracture mechanical properties in pure mode III. This paper addresses the need for the determination of fracture mechanical characteristics of POM for thin-walled components, so far lacking scientific literature. ...