Neste trabalho, ensaios de fadiga por fretting são conduzidos em dois fios cruzados feitos da liga de alumínio 6201-T81 retirados de um Cabo de Alumínio Liga 900 MCM. Um modelo de fadiga não-local, que foi recentemente desenvolvido na Universidade de Brasília, é avaliado em termos de sua capacidade de prever vidas em fadiga e orientações de plano c...
Este trabalho investigou a influência de pequenos defeitos no limite de fadiga do aço inoxidável 304L. Ensaios de fadiga controlados por força e/ou torque foram realizados em corpos de prova contendo um defeito cilíndrico com √area = 400 μm. As condições de carregamento investigadas foram: axial, torção, em fase, 90º fora de fase e trajetória quadr...
Dissertação (mestrado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Mecânica, 2019. / Sistemas de ancoragem, normalmente usados em embarcações de Unidades Flutuantes de Produção, Armazenamento e Transferência (FPSO, na sigla em inglês) são compostos de correntes metálicas acopladas a cabos de poliéster. É sabido que...
Abstract : Sustainable development has become more important year after year. The periodic meetings and discussions on the subject, since the Stockholm Conference in 1972, have been promoting debates and awareness among the world population about the need for action towards sustainability. Furthermore, there is a commitment by the governments of so...
Abstract : With the growing demand for low-carbon technologies, energy consumption reduction and environmental protection awareness, improvement of manufacturing processes energy efficiency has been widely adopted as a strategy for reduction of energy consumption and pollutants emission. Pneumatic systems, on its turn, are widely used in industrial...
Abstract : The dynamics of the human middle ear (ME) has been studied during the last years due to the interest in better understanding its different aspects and to observe the influence of different pathologies and their corrective surgeries, or the use of passive or active prostheses. In order to characterize the ME dynamics several approaches ha...
Abstract : Reciprocating compressor are designed and tested in calorimeters under steady-state operating conditions defined by standards. However, most household refrigerators operate under transient and periodic regimes, characterized by alternate periods in which the compressor is either operating (on) or idle (off). The result is a decoupled des...
Abstract : The discovery of large oil reservoirs, under a geological salt layer called pre-salt, raised Brazil in oil overseas oil market. The exploration of these reservoirs becomes very attractive from the financial perspective, but the wells are found about 7 km deep, which create great challenges in oil extraction and transportation. Due to gre...
Abstract : The human middle ear is part of auditory system which its function is to transmit the acoustical energy to inner ear by means of mechanical vibrations. Numerical models of the middle ear, such as models based on the Finite Element Method, are studied since the early 90 s. However, differently from structures usually studied in engineerin...
Abstract : The main aim of this research is to evaluate the influence of mineral skeletons formulation on rutting resistance of dense asphalt mixes from two distinct methods: trial and theoretical. Method by trial is majorly adopted in Brazil to formulate asphalt mixes, using heterogeneous commercial granular fractions without an accurate control r...
