Resumo

ISERNIA-TREBOLS, Daniel José  e  RODRIGUEZ-MATIENZO, Jorge. Fatigue crack modeling in a planar truss and its detection using the wavelet transform. Ingeniería Mecánica [online]. 2011, vol.14, n.1, pp. 74-86. ISSN 1815-5944.

The results of a modal analysis performed in several finite elements models of a planar truss with and without a partial crack, and crack detection by the wavelet transform of nodal displacements in the first mode are shown. The crack is represented by a zone with reduced bending stiffness, following the idea developed by A P. Bovsunovsky and V. V. Matveev for a cantilever beam, using the concept of strain energy in the crack tip. Several mother wavelet were used in order to find the most appropriated for the detection of discontinuities produced by the crack, and its usefulness in crack detection is probed.

Palavras-chave : planar truss; crack detection; modal analysis; wavelet transform.

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