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AbstractAbstract
[en] The mechanical behavior and fracture characteristics have been determined for a group of materials tested under conditions of creep, and the ability of various models detailed in the literature to describe these observed characteristics discussed. The parametric methods employed in formulating the indices which define the allowable stresses for design codes have been analysed, and a method of Minimum Standard Deviation (MSD) for construction of reference curves has been proposed. The constitutive equations used in the methods of analysis of creep stresses have been discussed. Finally, the accumulated damage by creep in a particular structure which had been in extended service has been characterized and, based on these observations, the methods for estimation of remaining life in industrial equipment have been analysed. (Author)
[pt]
Foi determinado o comportamento mecanico e de fratura de um conjunto de materiais ensaiados a fluencia. Discute-se a fidelidade com que alguns modelos indicados na literatura se ajustam a descricao das caracteristicas apuradas. Analisam-se os metodos parametricos empregados na avaliacao dos indices que definem as tensoes admissiveis para fluencia previstos nos Codigos de Projeto. Propoe-se o Metodo do Minimo Desvio Padrao (MDP) para construcao de curvas de referencia. As equacoes constitutivas utilizadas nos procedimentos de analise de tensoes em fluencia sao discutidas. Sao caracterizados os danos acumulados por fluencia em uma certa estrutura envelhecida em servico. A partir desses resultados, sao analisados os metodos de avaliacao da vida remanescente em equipamentos industriais. (Autor)Original Title
Acumulacao de dano e previsao da vida remanescente em ligas metalicas sob fluencia
Primary Subject
Source
Jul 1980; 378 p; Tese (Ph.D.).
Record Type
Miscellaneous
Literature Type
Thesis/Dissertation
Report Number
Country of publication
ALLOYS, CARBON ADDITIONS, CHROMIUM ALLOYS, CHROMIUM STEELS, CHROMIUM-NICKEL STEELS, CORROSION RESISTANT ALLOYS, ELEMENTS, HEAT RESISTING ALLOYS, INCONEL ALLOYS, IRON ALLOYS, IRON BASE ALLOYS, MECHANICAL PROPERTIES, METALS, MOLYBDENUM ALLOYS, NICKEL ALLOYS, NICKEL BASE ALLOYS, NIOBIUM ALLOYS, STAINLESS STEELS, STEELS, TRANSITION ELEMENT ALLOYS, TRANSITION ELEMENTS
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