Estudo numérico-experimental de fadiga no domínio do tempo de vigas sanduíches viscoelásticas empregando o modelo fracionário com recorrência

• Autor(a) principal: Garcia, Gabriella Faina
• Data de Publicação: 2022
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da UFU
• Texto Completo: https://repositorio.ufu.br/handle/123456789/34081; http://doi.org/10.14393/ufu.di.2022.8
• topic: Viscoelásticos; FDM; Fadiga; Método Rainflow; Regra de Palmgren-Miner; Viscoelastic materials; Fractional Derivative Model; Fatigue; Sandwich structures; Rainflow method; Palmgren-Miner rule; CNPQ::ENGENHARIAS::ENGENHARIA MECANICA::MECANICA DOS SOLIDOS::MECANICA DOS CORPOS SOLIDOS, ELASTICOS E PLASTICOS; Engenharia mecânica; Sólidos elásticos; Cálculos numéricos; Viscosidade

Fatigue is a process that involves successive damages accumulated until failure as a result of the imposed cyclic loading. One way to increase the fatigue life of a structure is by using specialized techniques or even vibration control techniques. Among the passive vibration control techniques worldwide, aeronautical materials are of great interest to the community and have aeronautical materials. This is due to the low cost of application and maintenance of these materials compared to other techniques, in addition to their great efficiency. However, a drawback is its strong in relation to the intensity of the intensification of the behavior and the operating temperature, which imposes difficulties in the modeling of viscoelastic systems, mainly for the study of fatigue over time. In this sense, this work presents a promising strategy for the study of fatigue of viscoelastic systems in the time domain. To use a dictionary-derived model with a recurrence formula to represent the behavior, both the viscoelastic material and time do not allow. For the study of fatigue, the viscoel model proposed here is combined with the Rainflow and Palmgren-Miner counting methods. efficient calculations in terms of proposal treatment efficiency, in addition to showing the influence of environmental and operational factors on the efficiency of life in viscoelastic. Finally, in order to verify the implementations made in the code itself, in MATLAB©, the numerical results, once they increase the base, are confronted with the experiments for the operating temperature. It increases the efficiency of the improved viscose materials, as is evident through the efficiency of the improved viscoelastic materials. In addition, an efficient study of the proposal for fatigue time in systems containing viscoelastic materials was demonstrated.