Contact Mechanics
Mostrando 13-24 de 38 artigos, teses e dissertações.
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13. Mecânica do contato com o método dos elementos de contorno para modelagem de máquinas tuneladoras. / Contact mechanics with the boundary elements method for the simulation of rock TBM tunneling.
Uma implementação computacional baseada nos conceitos da mecânica do contato e no Método dos Elementos de Contorno é desenvolvida para simular a interação entre discos de corte e maciço rochosos. Simula-se o contato considerando-se inicialmente uma superfície potencial de contato que é atualizada durante um processo de carregamento incremental, pod
Publicado em: 2009
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14. Optimization of the connecting-rod small end contact surface using the finite element method / Otimização da superficie de contato do olhal menor de uma biela utilizando elementos finitos
Nesta dissertação é abordado o tema otimização estrutural em componentes sob efeito de contato. O objetivo é otimizar a distribuição das pressões de contato atuantes no olhal menor de uma biela. Para alcançar este objetivo, são apresentadas técnicas de otimização estrutural baseada no método dos elementos finitos, são estudados conceitos rela
Publicado em: 2009
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15. Nonlinear boundary element models to analyse fracture problems and reliability/optimization models applied to structures submitted to fatigue / Modelos não lineares do método dos elementos de contorno para análise de problemas de fratura e aplicação de modelos de confiabilidade e otimização em estruturas submetidas à fadiga
This work deals with the development of boundary element method (BEM) formulations to be used in engineering problems. Particular attention is given to using these formulations in development of reliability and optimization models applied to fatigue problems. Contributions to BEM formulations are developed, particularly, models that deal with crack growth in
Publicado em: 2009
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16. Aplicação de moire de projeção com deslocamento de fase na geração de modelos digitais topograficos de orgão vegetais / Applications of projection moire technique with phase shifiting to agricultural engineering problems
Shape definition of bodies exhibiting symmetric, non symmetric or irregular geometry is of fundamental necessity for science and technology developments. Applications of objects shape survey is reflected on several science fields as biology, human prosthesis and orthesis, medical diagnosis, prediction of surgical results, orthopedics, veterinary medicine, in
Publicado em: 2008
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17. A resistência à compressão dos fixadores externos monoplanares em modelos de tíbias de poliuretano
Background:The use of external fixators is one of the most used treatment for bone diseases specially in the tibia shaft fractures. The knowledge in mechanics is a condition to understand how to improve the use of such devices. Objective: This is an experimental study with the objective of analyses the increase of rigidity in synthetic tibia bones with exter
Publicado em: 2007
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18. Study on factors which affect the accuracy of the filter-paper method. / Estudo sobre fatores que influenciam a acurácia do método do papel-filtro.
The purpose of this work is to verify the susceptibility of the filter-paper method to variations in three experimental parameters: roughness of porous medium (structure of porous matrix), period of exposition of the filter-paper to pore water (equilibration time) and degree of deficiency in contact between the filter-paper and the porous medium. In order to
Publicado em: 2007
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19. Estudo do comportamento ao desgaste e corrosÃo dos aÃos inoxidÃveis AISI 316L e AISI 420 depositados pelo processo de aspersÃo tÃrmica a arco elÃtrico
Mechanical components behavior in service, are extremely dependent on the surface quality, the contact between areas and the environment where they are applied. Particularly, corrosion and ware damage, directly and indirectly, mechanical components surface that result in rise production and maintenance cost due to no programmed equipments stops to repair or
Publicado em: 2007
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20. Non linear signal analysis applied to friction force identification in tribological tests / Identificação da força de atrito através de análise de sinais não lineares em ensaios tribológicos
When the surfaces of two elastic bodies present relative motions under certain amount of contact pressure the mechanical system can be instable. Experiments conducted on elastic bodies under friction forces shown that the dynamical system is self-excited by the non-linear behavior of frictional forces. The main objectives of this thesis are the study of the
Publicado em: 2005
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21. Estudo teórico-experimental da influência das cargas cíclicas na rigidez de vigas de concreto armado / Theoretical and experimental analysis of cyclic loads on stiffness of the reinforced concrete beams
The main purpose of this research is to analyze the experimental and theoretical behavior of reinforced concrete beams, in order to quantify the stiffness loss, by calculating successive deflections during the cyclic loads application, under service loads. The emphasis of this research is the numerical analysis. The modeling of steel-concrete interface is do
Publicado em: 2005
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22. EXPERIMENTAL VALIDATION OF MODELS FOR PREDICTING THE FORCES FOR REMOVING WAX DEPOSITS IN PIPELINES USING PIGS / AVALIAÇÃO DE MODELOS PARA A REMOÇÃO DE DEPÓSITOS DE PARAFINA EM DUTOS UTILIZANDO PIGS
Pigging is still the most widely used method to remove wax deposits in subsea pipelines. The passage of a pig is still considered a risky operation, since the pressure gradient available for driving the pig might not be sufficient to overcome the contact forces between the pig and the wall, as well as the forces required to remove the wax deposit. If this is
Publicado em: 2005
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23. Non linear signal analysis applied to friction force identification in tribological tests / IdentificaÃÃo da forÃa de atrito atravÃs de anÃlise de sinais nÃo lineares em ensaios tribolÃgicos
Quando as superfÃcies de dois corpos elÃsticos em contato apresentam movimento relativo, o sistema mecÃnico pode se tornar instÃvel. Experimentos conduzidos com corpos elÃsticos em contato mostram que o sistema à um sistema auto excitado devido à caracterÃstica nÃo linear da forÃa de atrito. Os objetivos principais desta tese sÃo o estudo do campo
Publicado em: 2005
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24. ESTUDO EXPERIMENTAL DA INTERAÇÃO FOLHELHO-FLUIDO ATRAVÉS DE ENSAIOS DE IMERSÃO / EXPERIMENTAL STUDY OF INTERACTION SHALE-FLUID THROUGH IMMERSION TESTS
Most of borehole instability problems occur when argillaceous rocks such as shales are drilled and the drilling fluid interacts with the rock. The rock-fluid interaction is materialized through the exchange of ions and water molecules between the drilling fluid and the rock, generating pore pressure variation inside the shale and changes in minerals structur
Publicado em: 2003