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Influence of micro-textures on cutting insert heat dissipation
Rosas, José; Lopes, Hernani; Guimarães, Bruno; Piloto, P.A.G.; Miranda, Georgina; Silva, Filipe S.; Paiva, Olga C.Metal machining is one of the most important manufacturing processes in today’s pro- duction sector. The tools used in machining have been developed over the years to improve their performance, by reducing the cutting forces, the friction coefficient, and the heat generated during the cutting process. Several cooling systems have emerged as an effective way to remove the excessive heat generated from the chip-t...
Influence of micro-textures on cutting insert heat dissipation
Rosas, José; Lopes, Hernani; Guimarães, Bruno; Piloto, Paulo A. G.; Miranda, Georgina; Silva, Filipe Samuel; Paiva, Olga C.Metal machining is one of the most important manufacturing processes in today’s production sector. The tools used in machining have been developed over the years to improve their performance, by reducing the cutting forces, the friction coefficient, and the heat generated during the cutting process. Several cooling systems have emerged as an effective way to remove the excessive heat generated from the chip-too...
Influence of micro-textures on cutting insert heat dissipation
Rosas, José; Lopes, Hernani; Guimarães, Bruno; Piloto, Paulo A. G.; Miranda, Georgina; Silva, Filipe S.; Paiva, Olga C.Metal machining is one of the most important manufacturing processes in today’s production sector. The tools used in machining have been developed over the years to improve their performance, by reducing the cutting forces, the friction coefficient, and the heat generated during the cutting process. Several cooling systems have emerged as an effective way to remove the excessive heat generated from the chip-too...
Sprint versus isolated eccentric training: Comparative effects on hamstring arc...
Mendiguchia, Jurdan; Conceição, Filipe; Edouard, Pascal; Fonseca, Marco; Pereira, Rogerio; Lopes, Hernani; Morin, Jean-Benoît; Jiménez-Reyes, PedroAims The purpose of this study was to compare the effects of hamstring eccentric (NHE) strength training versus sprint training programmed as complements to regular soccer practice, on sprint performance and its mechanical underpinnings, as well as biceps femoris long head (BFlh) architecture. Methods In this prospective interventional control study, sprint performance, sprint mechanics and BFlh architecture va...
Mechanical analysis of PDMS material using biaxial test
Ribeiro, J.E.; Lopes, Hernani; Martins, Pedro; Braz-César, ManuelPolydimethylsiloxane (PDMS) materials are classified as a silicone and commonly present a hyperelastic behaviour. Many researchers have studied PDMS in recent years, motivated by its applications in the biomedical field. In the present manuscript, a biaxial tensile test performed at different speeds is described. The displacement field for the different experimental test conditions is measured using the digital...
Optimization of cutting parameters to minimize the surface roughness in the end...
Ribeiro, J.E.; Lopes, Hernani; Queijo, Luis; Figueiredo, DanielThis paper presents a study of the Taguchi design application to optimize surface quality in a CNC end milling operation. The present study includes feed per tooth, cutting speed and radial depth of cut as control factors. An orthogonal array of L9 was used and the ANOVA analyses were carried out to identify the significant factors affecting the surface roughness. The optimal cutting combination was determined ...
Optimization of machining parameters to improve the surface quality
Ribeiro, J.E.; Braz-César, Manuel; Lopes, HernaniThe preparation of quality surfaces is very important process in the surface engineering. The surface roughness will influence the quality and effectiveness of the subsequent coatings for protection against corrosion, wear resistance and finishes quality of decorative layers. For these reasons, the authors of the present work have focused in manufacturing parameters that influence the surface quality of hardnes...
Milling parameters optimization for surface quality
Dias, Tânia Maria Costa; Paulo, Nuno José Lopes; Lopes, Hernani; Braz-César, Manuel; Queijo, Luis; Ribeiro, J.E.The Taguchi method is a powerful tool to experiment design optimization and is used in this work to optimize the cutting parameters, which reduce the chatter ef-fect on surface quality. The present study includes feed per tooth, cutting speed, radial and axial depth of cut as control factors. An orthogonal array of L16 was used with the ANOVA analyses in order to identify the significant factors asso-ciated to ...
Estimation of the dynamic modal parameters of a small-scaled mockup
Braz-César, Manuel; Ribeiro, J.E.; Lopes, HernaniThis paper presents the experimental and numerical research carried out on a reduced-scaled model to obtain and simulate its dynamic modal properties. A roving impact hammer test was carried out to identify the dynamic modal properties of the structure. The measured input and output values were acquired using a Data Acquisition System (DAQ) in order to compute the corresponding Frequency Response Function (FRF)...
Assessment of the displacement field along a surface crack in a flat plate usin...
Ribeiro, J.E.; Vaz, M.A.P.; Lopes, Hernani; Melo, F.J.M.Q. de; Monteiro, Jaime M.Structural components may contain cracks, and for these components a crack tip represents a highly singular stress. The evaluation of the associated strain gradient is difficult to achieve with experimental discrete methods. An efficient alternative are the optical techniques which are non-contact, and so delivering continuous information of the displacement fields and associated derivatives for strain evaluati...