Resumo

RODRIGUEZ-VILLARROEL, Freddy Enrique  e  RODRIGUEZ-MATIENZO, Jorge. Partial transverse crack modelling in pipes under internal pressure using finite elements. Ingeniería Mecánica [online]. 2010, vol.13, n.3, pp. 46-55. ISSN 1815-5944.

Fail detection in pipes under internal pressure is a not enough studied matter. A main problem is fault modeling, particularly the closed crack type. The dynamic of a pipe filled with a fluid under pressure implies additional challenges. The equations and principles needed to obtain a finite elements model of a partial transverse crack in a thin walled pipe are shown in different sceneries: empty, filled with fluid and filled with fluid under certain pressure. A modal analysis is performed to obtain the changes in modal parameters and crack influence. The result shows a good agreement with those obtained by S.M. Murigendrappa and S.K. Maiti. The crack is modeled trough a reduction of bending stiffness in a reduced zone. Its extension is calculated using the principle of equal strain energy between the crack zone and the model, exposed by A P. Bovsunovsky and V. V. Matveev.

Palavras-chave : crack detection; modal analysis.

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