Numerical and experimental verification of a technique for locating a fatigue crack on beams vibrating under Gaussian excitation

Benfratello S; Cacciola P; Impollonia N; Masnata A; Muscolino G

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    33 Citations (Scopus)

    Abstract

    The stationary vibrations of a beam excited by Gaussian noise are strongly affected by the presence of a fatigue crack. Indeed, as soon as the crack arises the system response becomes non-linear due to crack breathing and a non-Gaussian behaviour is encountered. The paper presents both numerical and experimental investigations in order to assess the capability of the non-Gaussianity measures to detect crack presence and position. Monte Carlo method is applied to evaluate in time domain the higher order statistics of a cantilever beam modelled by finite elements. The skewness coefficient of the rotational degrees of freedom appears the most suitable quantity for identification purpose being very sensitive to the non-linear behaviour of the cracked beam.
    Original languageEnglish
    Pages (from-to)2992-3001
    JournalEngineering Fracture Mechanics
    Volume74
    Publication statusPublished - 2007

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