84 documents found, page 1 of 9
Biotribology of articular joints and oral cavity
Gomes, J. R.Artificial articular joints are one of the most successful medical devices used in human beings providing amazing recovery of mobility. No less important for quality of life is oral health, in which dental tribology plays a decisive role complemented by soft oral tribology particularly due to the surprising close relationship found between friction coefficient, rheology of foods and the oral perception/flavor.
Friction characteristics of doublewall carbon nanotube-based nanobearings: a co...
Abreu, Cristiano S.; Gomes, J. R.A convergence in scientific advancements associated with molecular biology and nanofabrication technologies now offers the potential of engineering functional hybrid organic/inorganic devices on a nanometer scale. As such, the creation of nanomechanical systems powered by biological motors is within reach. Doublewall carbon nanotubes (DWCNT) offer great potential as nanobearings due intrinsically atomically smo...
Tribological behaviour of antimicrobial surfaces for orthopaedics and oral reha...
Veloso, Jorge; Borges, Joel; Vaz, Filipe; Carvalho, Oscar; Souza, Julio; Gomes, J. R.Inflammatory reactions around implants and prosthetics can occur due to the accumulation of pathogenic bacteria species. The long-term success of implants and prostheses depends on the healthy state of surrounding mucosa, bone, and connective tissues, that can be controlled by manufacturing surfaces with specific physical-chemical aspects to prevent the accumulation of bacteria. Among several properties, the fr...
Protective coatings for complex organic flexible materials I: characterization ...
Tiss, Belgacem; Martínez-Martínez, D.; Mansilla, C.; Gomes, J. R.; Abreu, C. S.; Pereira, N.; Cunha, L.The escalating imperative to combat the climate change has generated sustainability trends, leading to a rising demands for eco-friendly products. Cork and rubber are versatile materials based or derived from natural sources with various industrial uses and applications. This work represents the first part of a comprehensive investigation focusing on cork, with rubber being the subject of a subsequent paper. Co...
Experimental and CFD simulation analysis of 3D cooling channels to improve the ...
Capela, Paulina Araújo; Costa, S.; Gomes, J. R.; Ribeiro, J.; Pereira, M.; Soares, DelfimEfficient heat and debris removal is essential to optimize the grinding process. A promising approach is the incorporation of three-dimensional channels in the grinding wheel to improve cutting fluid distribution. This study evaluates two types of grooved abrasive discs with spiral and hexagonal geometries, comparing them to a non-structured disc. In addition to experimental tests, Computational Fluid Dynamics ...
Deep neural network potential model (DNNP) for predicting the friction and wear...
Abreu, C. S.; Gomes, J. R.Accelerating the discovery of materials with desired properties has been a long-standing challenge in materials sciences. Nonetheless, the computational cost of accurate quantum-mechanical calculations proves prohibitive for simulations involving larger spatial and time scales. In recent years, increased efforts to overcome this bottleneck have been undertaken using machine learning (ML), where only a reduced s...
Tribological properties of antimicrobial surfaces for orthopaedics and oral reh...
Veloso, J.; Borges, J.; Vaz, F.; Carvalho, O.; Souza, J. C. M.; Gomes, J. R.Inflammatory reactions around implants and prosthetics can occur due to the accumulation of pathogenic bacteria species. The long-term success of implants and prostheses depends on the healthy state of surrounding mucosa, bone, and connective tissues, that can be controlled by manufacturing surfaces with specific physical-chemical aspects to prevent the accumulation of bacteria. Among several properties, the fr...
Design of an experimental grinding machine for testing abrasive wheels with a 3...
Costa, S.; Araújo, P.; Capela, P.; Gomes, J. R.; Ribeiro, J.; Pereira, M.; Soares, DelfimPrecision manufacturing often utilizes grinding as a method to fabricate components with accuracy, enhanced surface quality, and desirable forming tolerances. The working conditions of a grinding machine and the attributes of the abrasive wheel play a crucial role in influencing the grinding process. Main challenges in grinding are related to heat dissipation, resulting in issues such as tool wear, increased fo...
Conventional and recent advances of vegetable oils as Metalworking Fluids (MWFs...
Afonso, Inês S.; Nobrega, Glauco; Lima, Rui Alberto Madeira Macedo; Gomes, J. R.; Ribeiro, João E.Vegetable oils have been used as metalworking fluids (MWFs) for many years, particularly in small-scale metalworking operations and in industries where environmental regulations are strict. Before the development of modern MWFs, vegetable oils were one of the most common lubricants used for metalworking tools. The use of vegetable oils can be traced back to ancient civilizations such as Egypt, Greece, and Rome,...
Wear behavior of a new composite formulation, with TEOS addition, for abrasive ...
Capela, Paulina Araújo; Costa, Sharlane Maria; Souza, M. S.; Carvalho, Sérgio Manuel Freitas; Pereira, Mário; Carvalho, L.; Gomes, J. R.; Soares, DelfimVitrified grinding wheels are used in many manufacturing industries to shape and finish metals and other materials in an efficient way. This work addresses a new approach with the use of tetraethyl orthosilicate solution (TEOS solution or silica sol), as an additive, in vitrified abrasive composites for grinding wheels. Different types of composite were produced using always the same materials and processing me...