Estudo do teste de esfera: determinação da isotropia de chapas metálicas

• Ano de defesa: 1989
• Autor(a) principal: Oliveira, Luiz Claudio
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Uberlândia; Brasil; Programa de Pós-graduação em Engenharia Mecânica
• Palavras-chave em Português: Teste de esfera; Anisotropia de placas; Placas com furo; Similitude; Fotoelasticidade tridimensional e de reflexão; Método dos elementos finitos; Ball test; Anisotropy in plates; Plates with a hole; Three-dimensional photoelasticity; Birefringent coatings; Finite element method; CNPQ::ENGENHARIAS::ENGENHARIA MECANICA; Engenharia Mecânica; Anisotropia; Máquinas agrícolas
• Link de acesso: https://repositorio.ufu.br/handle/123456789/28960; http://doi.org/10.14393/ufu.di.1989.4

This work aims the generalization of the Bali Test towards its application to every thickness of disk blades or metal plates on a predetermined internai energy levei. The standard procedure is given by NBR 9113/85. A lack of systematic studies of the relationship between the main variables of the test leads to restrictions on its application. This work first re-views mechanical anisotropy-concepts related to the subject and discusses the test variables and adimensional terras. Then, the stress distribution inner several geometries of plates is obtained by using the esperimental technique of Photoelasticity and a numerical Computer simulation based on the Finite Element Method. A failure theory founded on internai distortion energy is employed, criticai points being defined by maximum distor­tion energy leveis. The results are a formulation of test geo­metries which enable the performance of tests accordingly to the purpouses stated above, by means of the prediction equation developed. Practical data from initial stages of the developed formulae application on disk blades are also available.