Sliding Contact
Mostrando 13-24 de 34 artigos, teses e dissertações.
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13. Modelagem bidimensional de hidrofobicidade e superhidrofobicidade em superfícies de pilares / Two dimensional modeling of hydrophobicity and superhidrophobicity on pillar-like surfaces
In this work we investigate the use of the Potts Cellular Model in simulations of the water droplets on flat hydrophobic and pillarlike surfaces surrounded by gas. Eight tests were chosen to validate the model, based on experimental and theoretical results: (1) the measurement of the contact angle on a flat hydrophobic surface; (2) the transition from Cassie
Publicado em: 2010
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14. Applied mechanics of the Puricelli osteotomy : a linear elastic analysis with the finite element method
Background: Surgical orthopedic treatment of the mandible depends on the development of techniques resulting in adequate healing processes. In a new technical and conceptual alternative recently introduced by Puricelli, osteotomy is performed in a more distal region, next to the mental foramen. The method results in an increased area of bone contact, resulti
Publicado em: 2010
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15. Hybrid motion planning approach for robot dexterous hands
This paper presents a manipulation planning approach for robot hands that enables the generation of finger trajectories. The planner is based on a hybrid approach that combines discrete-continuous kinematics using a fully discrete transition system. One of the main contributions of this work consists in the representation of the universe of different submode
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2009-12
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16. Study on the wear behavior of uncoated and thin film coated tools used in cold forming operations. / Estudo do desgaste de ferramentas com e sem revestimentos de filmes finos utilizadas em operações de conformação a frio.
This work is devoted to the study of wear mechanisms in cold forming tools, such as punches and dies. The text begins with a discussion on the galling phenomenon, which is the main wear mechanism that takes place in cold forming operations. A brief analysis of the tribological behavior of punches that have operated in industrial conditions is then presented.
Publicado em: 2009
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17. In vitro wear resistance of three types of polymethyl methacrylate denture teeth
The wear resistance of denture teeth is important to the longevity of removable prostheses of edentulous patients. The ability of denture teeth to maintain a stable occlusal relationship over time may be influenced by this property. The purpose of this in vitro study was to evaluate the wear resistance of polymethyl methacrylate (PMMA) denture teeth based on
Journal of Applied Oral Science. Publicado em: 2008-06
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18. Comparative behaviour in terms of wear and corrosion resistance of galvanized and zinc-iron coated steels
Materials degradation due to simultaneous chemical and mechanical effects may occur under a variety of conditions. Galvanized and zinc-iron electrodeposited steels are widely used to protect automobile bodies against corrosion. In such applications, it is important to investigate the electrochemical and tribological behaviour of the coatings, in order to und
Matéria (Rio de Janeiro). Publicado em: 2007-12
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19. Aplicação da tribologia ao estudo e desenvolvimento de materiais para embreagem automotiva / Application of tribology the study and development of materials to automotive clutch
During the clutch engagement manoeuvre, sliding contact occurs between the pair of clutch facings mounted on the friction disk and the counter faces belonging to the flywheel and the pressure plate. The materials used in the clutch have to ensure a smooth performance and friction coefficient that is sufficiently high and stable, thus providing regular and ef
Publicado em: 2007
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20. TRACTION CONTROL TO MOBILE ROBOTIC SYSTEMS IN ROUGH TERRAIN / MODELAGEM DE SISTEMAS ROBÓTICOS MÓVEIS PARA CONTROLE DE TRAÇÃO EM TERRENOS ACIDENTADOS
Abstract Silva, Alexandre F. Barral Silva; Meggiolaro, Marco Antonio. Traction Control to Mobile Robotic Systems in Rough Terrain. Rio de Janeiro, 2004. 194 p. MSc. Thesis - Departamento de Engenharia Mecânica, Pontifícia Universidade Católica do Rio de Janeiro. In rough terrain it is critical for mobile robots to maintain adequate wheel traction, because
Publicado em: 2007
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21. Estudo do comportamento do coeficiente de desgaste e dos modos de desgaste abrasivo em ensaios de desgaste micro-abrasivo. / Wear coefficient and wear mode transition study in micro-abrasive wear testing.
This work presents a study on the behavior of different materials under the action of micro-abrasive wear. A micro-abrasive wear testing machine with fixed sphere was designed and constructed, presenting a mechanical configuration with differences with respect to those found in the literature (Gee et al., 2005). M2 tool steel and WC-Co P20 were used as testi
Publicado em: 2006
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22. Influence of surface topography on the surface durability of steam oxidised sintered iron
Durability of surfaces has been reported as the main factor affecting tribological behavior of steam oxidised sintered iron. The presence of surface pores and their negative influence on load bearing capacity, suggest that surface topography might play an important role on the durability of the oxide layer. In this paper, the influence of compaction pressure
Materials Research. Publicado em: 2005-06
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23. Modelo de desgaste oxidativo baseado em parâmetros termodinâmicos. / Oxidational wear model based on thermidynamic parameters.
During sliding wear, heat generated friction occurs, which favors oxidation occurrence on the contacting surfaces of metallic materials. The oxidation phenomenon can result in wear rate attenuation due to transitions in the contact feature from metal-metal to either metal-oxide or oxide-oxide. This work aimed to develop a theoretical modeling on oxidational
Publicado em: 2004
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24. Dynamic signal analyses in dry sliding wear tests
This work proposes to perform a dynamic analysis of the friction force and the vibrations produced in pin-on-disk sliding tests. The sliding tests were run under dry condition with austenitic stainless steel and high-speed steel pairs. The obtained results were the pin mass loss, the average friction force and power spectrum density (PSD) graphs of the frict
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2003-09